The correct matching is of pair of items is :
Known quantities in the problem --> Often provide useful conversion factors
Unknown quantity --> Will be the solution to the problem
Units of conversion factors --> Must cancel at each step, except for the units needed for the answer
Any units that do not cancel --> Are the units for the unknown quantity
1)The known quantities in the problem often provide useful conversion factors.
2)The unknown quantity will be the solution to the problem.
3)The units of conversion factors must cancel at each step, except for the units needed for the answer.
4)Any units that do not cancel are the units for the unknown quantity.
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How many atoms are in 3.65 mol of titanium
1.25 x 1025 atoms
2.20 x 1023 atoms
4.52 x 1023
3.61 atoms
2.20×10²³ atoms are in 3.65 mol of titanium. Therefore, the correct option is option B among all the given options.
What is titanium?Titanium has the chemical symbol Ti and the atomic number 22. It is only found in nature as an oxide, but it may be reduced to form a beautiful transition metal with such a silver hue, low density, as well as high strength that is corrosion resistant in sea water, aqua regia, as well as chlorine.
number of atoms = number of mole× 6.022×10²³
substituting all the given values in the above equation, we get
number of atoms = 3.65 mol× 6.022×10²³
= 2.20×10²³ atoms
Therefore, the correct option is option B.
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When chlorine is added to acetylene, tetrachloroethaneis formed:
2 Cl2(g)+ C2H2(g)-->C2H2Cl4(l)
How many liters of chlorine at STP will be needed to make 75.0 grams of C2H2Cl4? Use 4 sig figs.
_____ L Cl2
50 points
Answer:
Explanation:
To determine the amount of chlorine needed to make 75.0 grams of C2H2Cl4, we need to balance the chemical equation and then use the molar ratio between the reactants and product to find the amount of Cl2 needed.
The balanced equation is:
2 Cl2(g) + C2H2(g) -> C2H2Cl4(l)
Next, we can use the molar mass of C2H2Cl4 to find the number of moles of C2H2Cl4 produced:
75.0 g C2H2Cl4 x (1 mole C2H2Cl4 / 153.8 g C2H2Cl4) = 0.489 moles C2H2Cl4
Since the balanced equation has a 1:2 ratio of C2H2 to Cl2, this means that we need 2 moles of Cl2 for every mole of C2H2Cl4 produced. Therefore, we will need 2 x 0.489 moles = 0.978 moles of Cl2.
Finally, to find the volume of Cl2 at STP, we can use the ideal gas law:
PV = nRT
Where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.0821 L-atm/mol-K), and T is the temperature in Kelvin (273 K).
Since the pressure is 1 atm and the temperature is 273 K, we can rearrange the equation to solve for volume:
V = nRT / P = 0.978 moles x 0.0821 L-atm/mol-K x 273 K / 1 atm = 17.1 L
Therefore, 17.1 liters of Cl2 at STP will be needed to make 75.0 grams of C2H2Cl4.
5. If iron filings are added to the reaction above, and they are allowed to rust
according to the following reaction, then they will remove the oxygen from the
above reaction. How will equilibrium shift upon addition of iron?
4 Fe (s) + 3 O2 (g) 2 Fe2O3 (S)
Upon addition of iron, the equilibrium will shift toward forward according to Le Chatelier’s principle in the reaction 4 Fe (s) + 3 O[tex]_2[/tex] (g) →2 Fe[tex]_2[/tex]O[tex]_3[/tex] (S)
What is equilibrium?Equilibrium is commonly characterized as a condition of rest in which no change occurs. A body in equilibrium will have no negative or positive energy exchanges.
The equilibrium state is defined differently in biology, physics, and chemistry. However, the underlying principle remains the same. External forces will have little effect on an organism that is in balance. Upon addition of iron, the equilibrium will shift toward forward according to Le Chatelier’s principle in the reaction 4 Fe (s) + 3 O[tex]_2[/tex] (g) →2 Fe[tex]_2[/tex]O[tex]_3[/tex] (S)
Therefore, upon addition of iron, the equilibrium will shift towards forward according to Le Chatelier’s principle.
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The heart pumps blood at an average rate of 5 L/min. The gauge pressure on the venous (intake) side is 0 mm Hg and that on the arterial (discharge) side is 100 mm Hg. Energy is supplied to the heart as heat released by the absorption of oxygen in the cardiac muscles: 5 mL (STP)O2/min is absorbed, and 20.2 J is released per mL of O2 absorbed. Part of this absorbed energy is converted to flow work (the work done to pump blood through the circulatory system), and the balance is lost as heat transferred to the tissues surrounding the heart.
(a). Simplify Equation 7.4-12 for this system, assuming (among other things) that there is no change in internal energy from inlet to outlet.
(b). What percentage of the heat input to the heart (Q˙in) is converted to flow work? (The answer may be thought of as the efficiency of the heart as a pump.)
Only a very small percentage of the heat input to the heart is converted to flow work. The majority of the energy is lost as heat transferred to the tissues surrounding the heart.
How to calculate the heat input?
(a) For this system, we can simplify Equation 7.4-12 as follows:
ΔH = Δ(P/ρ) + Δ(V^2/2) + gΔ(z) + Q
where:
ΔH is the change in enthalpy
Δ(P/ρ) is the change in pressure energy
Δ(V^2/2) is the change in kinetic energy
gΔ(z) is the change in potential energy
Q is the heat added to the system
Since there is no change in internal energy from inlet to outlet, we can assume that the change in enthalpy (ΔH) is equal to the work done by the heart (W):
W = Δ(P/ρ) + Δ(V^2/2) + gΔ(z) + Q
(b) We can find the percentage of the heat input to the heart (Q˙in) that is converted to flow work (the efficiency of the heart as a pump) by calculating the ratio of flow work to heat input:
Efficiency = (flow work / heat input) x 100%
To calculate the flow work, we can use the equation:
W_flow = Δ(P/ρ) x Q
where Δ(P/ρ) is the pressure difference across the heart and Q is the volumetric flow rate of blood.
Δ(P/ρ) = (100 - 0) mm Hg / (13.6 x 1000) kg/m^3 = 7.35 x 10^-6 Pa
Q = 5 x 10^-3 m^3/min = 8.33 x 10^-5 m^3/s
W_flow = (7.35 x 10^-6 Pa) x (8.33 x 10^-5 m^3/s) = 6.13 x 10^-10 J/s
To calculate the heat input, we can use the equation:
Q_in = (5 mL/min) x (20.2 J/mL) = 101 J/min = 1.68 J/s
Therefore, the efficiency of the heart as a pump is:
Efficiency = (W_flow / Q_in) x 100%
Efficiency = (6.13 x 10^-10 J/s / 1.68 J/s) x 100% = 0.0365%
Only a very small percentage of the heat input to the heart is converted to flow work. The majority of the energy is lost as heat transferred to the tissues surrounding the heart.
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Consider the reaction:
NaNO2(aq) + H2NSO3H(s) → NaHSO4(aq) + N2(g) + H2O(l)
If you start with 1.627 g of H2NSO3H and an excess amount of NaNO2,
how many moles of N2 will be produced?
Nitrogen is indeed a nonmetal as well as the lightest member of Periodic Table. 0.016mol of N[tex]_2[/tex] will be produced.
What is nitrogen?Nitrogen has the chemical symbol N and the atomic number 7. Nitrogen is indeed a nonmetal as well as the lightest member of Periodic Table Group 15, often known as the pnictogens. This is a common element inside the cosmos, with an estimated total abundance of sixth in the Milky Way.
NaNO[tex]_2[/tex](aq) + H[tex]_2[/tex]NSO[tex]_3[/tex]H(s) → NaHSO[tex]_4[/tex](aq) + N[tex]_2[/tex](g) + H[tex]_2[/tex]O(l)
moles of H[tex]_2[/tex]NSO[tex]_3[/tex]H = 1.627 /97.09=0.016mol
the mole ratio between H[tex]_2[/tex]NSO[tex]_3[/tex]H and N[tex]_2[/tex] is 1:1
moles of N[tex]_2[/tex] =0.016mol
Therefore, 0.016mol of N[tex]_2[/tex] will be produced.
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after the equilibrium represented above is established, some pure o2(g) is injected into the reaction vessel at constant temperature. after equilibrium is reestablished, which of the following has a lower value compared to its value at the original equilibrium?
The amount of SO₂(g) in the reaction vessel has a lower value compared to its value at the original equilibrium. Option d is correct choice.
Injecting pure O₂(g) into the reaction vessel at a constant temperature will cause the system to shift towards the right side of the equation in order to consume the added O₂. This means that the amount of SO₂(g) in the reaction vessel will decrease, while the amount of SO₃(g) and O₂(g) will increase.
Since the reaction is exothermic, adding O₂(g) will not change the equilibrium constant (Keq) of the reaction, so (A) is not affected. However, the amount of O₂(g) in the reaction vessel will increase, so (C) has a higher value compared to its value at the original equilibrium.
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--The complete question is, 2SO(g) <-> 2SO₂(g) + O₂(g)
After the eq. represented above is established, some pure O₂(g) is injected into the reaction vessel at a constant temperature. After equilibrium is reestablished, which of the following has a lower value compared to its value at the original equilibrium?
A. Keq for the reaction
B. The amount of SO₃(g) in the reaction vessel
C. The amount of O₂(g) in the reaction vessel.
D. The amount of SO₂(g) in the reaction vessel.--
12. A gas at STP occupies 13.4 L of space.
a. How many mole is in this volume of gas?
b. Determine the number of molecules in this volume of gas.
Answer:
0.556 moles of gas in this volume
there are approximately 3.35 x 10^23 molecules in this volume of gas.
Explanation:
Given:
Volume of gas (V) = 13.4 L
Standard temperature (T) = 273 K
Standard pressure (P) = 1 atm
a. To determine the number of moles of gas in this volume, we can use the ideal gas law equation:
PV = nRT
where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
At STP, we know that the pressure is 1 atm and the temperature is 273 K. The gas constant R is 0.08206 L atm/mol K.
Plugging in the values, we get:
(1 atm) (13.4 L) = n (0.08206 L atm/mol K) (273 K)
Solving for n, we get:
n = (1 atm * 13.4 L) / (0.08206 L atm/mol K * 273 K) = 0.556 mol
Therefore, there are 0.556 moles of gas in this volume.
b. To determine the number of molecules in this volume of gas, we can use Avogadro's number, which tells us the number of molecules in one mole of a substance. Avogadro's number is approximately 6.02 x 10^23 molecules/mol.
Multiplying the number of moles by Avogadro's number, we get:
0.556 mol * (6.02 x 10^23 molecules/mol) = 3.35 x 10^23 molecules
Therefore, there are approximately 3.35 x 10^23 molecules in this volume of gas.
5. A red maple tree has leaves with three main points that are an average of 3 inches long. It blooms with small pink flowers in the spring. The tree reproduces by creating winged seeds that can be blown through the air during the summer and fall. Before the winter, the leaves turn red and fall off of the tree as the days grow shorter. What determines these traits of the red maple tree? A. the impact of animal species that use the maple tree for food and shelter B. the instructions on chromosomes inside the cells of the maple tree C. the limitations imposed on the maple tree by resources such as nutrients and water D) the energy produced during photosynthesis by the chloroplasts in the cells of the maple tree
Answer:
GIVE IT NOWWWW
Explanation:
5. Imagine an experiment in which the percentage of manganese, Mn, in a manganese ore is to be determined by gravimetric analysis. If 0.8423 g of the ore yielded 0.307 g of MnO precipitate what is the percent Mn in the ore?
If 0.8423 g of the ore yielded 0.307 g of MnO precipitate .The percent Mn in the ore is 24.1%.
What is the percent Mn in the ore?To determine the percent Mn in the ore, we need to calculate the mass of Mn in the ore and then convert that to a percentage.
First, we'll calculate the mass of Mn in the MnO precipitate:
Mass of Mn = 0.307 g MnO * (1 mol MnO / 70.9 g MnO) * (1 mol Mn / 1 mol MnO) * (54.9 g Mn / 1 mol Mn)
Mass of Mn = 0.203 g Mn
Next, we'll divide the mass of Mn in the ore by the total mass of the ore and multiply by 100 to get the percentage:
Percentage = (0.203 g Mn / 0.8423 g ore) * 100
Percentage = 24.1% Mn
Therefore the percent Mn in the ore is 24.1%.
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An organic liquid is a mixture of methyl alcohol (CH3OH) and ethyl alcohol (C2H5OH). A 0.220-g sample of the liquid is burned in an excess of O2(g) and yields 0.338 g CO2(g) (carbon dioxide).
What is the mass percentage of ethyl alcohol, C2H5OH, in the solution?
An organic liquid is a mixture of methyl alcohol (CH3OH) and ethyl alcohol (C2H5OH). A 0.220-g sample of the liquid is burned in an excess of O2(g) and yields 0.338 g CO2(g) (carbon dioxide). The mass percentage of ethyl alcohol, C2H5OH, in the solution is 0.0641 g.
What is mass percent ?The term mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution.
Molar mass of CH₃OH is 32.04 g/mol
Molar mass of C₂H₅OH is 46.07 g/mol
Molar mass of CO₂ is 44.01 g/mol
M(CH₃OH)+ M(C₂H₅OH) = 0.220
Mass of CO₂ produced from M grams of CH₃OH
= 1.374 M
Mass of carbon dioxide is 1.374 M + 1.911 E
= 0.386
Thus, the calculation are
1.374 M + 1.911 (0.220 - M) = 0.386
1.374 M + 0.4204 - 1.911 M = 0.386
- 0.537 M = - 0.0344
M = 0.0344 / 0.537
= 0.0641 g
Thus, the mass percentage of ethyl alcohol, C2H5OH, in the solution is 0.0641 g.
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Use the reaction below to calculate the number of grams of Al2O3 that could formed if 12.5 g O2 react completely with aluminum? (Answer: 26.6 g Al2O3)
4Al + 3O2 -> 2Al2O3
The number of grams of Al2O3 that can be formed if 12.5 g of O2 reacts completely with aluminum is 26.6 g.
The balanced chemical equation for the reaction is:
4Al + 3O2 -> 2Al2O3
From above,
We can conclude that,
4 moles of Al react with 3 moles of O2 to produce 2 moles of Al2O3.
Now using the above expression for calculating the number of moles of Al2O3 that can be produced from 12.5 g of O2.
For finding the number of moles, converting the mass of O2 to moles using its molar mass:
molar mass of O2 = 32.00 g/mol
moles of O2 = mass / molar mass = 12.5 g / 32.00 g/mol = 0.391 mol
Next, using the mole ratio from the balanced chemical equation to determine the number of moles of Al2O3 that can be produced:
moles of Al2O3 = (2/3) * moles of O2 = (2/3) * 0.391 mol = 0.261 mol
Now converting the number of moles of Al2O3 to grams using its molar mass:
molar mass of Al2O3 = 101.96 g/mol
So, the value of mass of Al2O3 will be
= moles of Al2O3 * molar mass = 0.261 mol * 101.96 g/mol = 26.6 g
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Calculate the current flowing into a desktop computer plugged into a 120-V outlet if the power used is 180 W.
If a desktop computer uses 180 W of power when plugged into a 120-V socket, 1.5 A of current is flowing into the device.
To calculate the current flowing into a desktop computer plugged into a 120-V outlet, we can use the formula:
Current (I) = Power (P) / Voltage (V)
here:
Current is measured in amperes (A)
Power is measured in watts (W)
Voltage is measured in volts (V)
So, for a desktop computer that uses 180 W and is plugged into a 120-V outlet, the current flowing into the computer would be:
I = P / V
= 180 W / 120 V
= 1.5 A
Therefore, the current flowing into the desktop computer is 1.5 amperes.
Note: It's important to ensure that the electrical outlet and the computer's power supply can handle the amount of current being drawn by the computer to avoid overloading the circuit and causing damage.
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specify the hydrogen bonding behavior of the 4 species below by selecting: donor for species that act as donors only acceptor for species that act as acceptors only both for species that act as both donors and acceptors neither for species that act neither as donors nor as acceptors.
The 4 species below which specify the hydrogen bonding behavior are:
Water (H2O): both (acts as both donor and acceptor)
Methanol (CH3OH): both (acts as both donor and acceptor)
Ammonia (NH3): donor (acts as a donor only)
Carbon dioxide (CO2): neither (does not act as a donor or acceptor)
Hydrogen bonding is a type of intermolecular force that occurs between a hydrogen atom bonded to a highly electronegative atom such as nitrogen, oxygen, or fluorine, and an electronegative atom in a nearby molecule.
The hydrogen atom has a partial positive charge due to the electronegativity difference between the bonded atoms, and the electronegative atom in the nearby molecule has a partial negative charge. These opposite charges attract each other, forming a relatively strong electrostatic interaction called a hydrogen bond.
Hydrogen bonding is responsible for many important properties of substances, including the high boiling and melting points of water, the high heat of vaporization of water, and the unique structure and properties of biomolecules such as DNA and proteins.
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a neutral atom of the element given by the symbol ca will to become an ion with a complete outer shell. True or False?
The given statement "A neutral atom of the element given by the symbol ca will to become an ion with a complete outer shell " is true because this is to complete the octet rule.
The atomic number of the calcium, Ca is 20. The neutral calcium atom, has the 20 protons and the 20 electrons, and it readily loses the two electrons. This will results in the cation with the 20 protons, the 18 electrons, with the charge of 2+ charge. Calcium has the same number of the electrons as the atoms of the preceding the noble gas, the argon, and the symbol is Ca²⁺. The calcium ion is more stable than the calcium neutral atom.
Thus ca loose the 2 electrons and acquire the noble gas configuration to become more special.
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which of the following pairs are miscible. which of the following pairs are miscible. water and ethyl acetate water and ethanol all of these are immiscible water and dichloromethane
The pair which are miscible liquids are the correct option is water and the ethanol.
The Miscible liquids are the liquids that are dissolve in the each other and will form the homogeneous mixture and the immiscible liquids are the liquids in which the liquids that will not mix well in the each other. The Alcohol and the water are the miscible liquids and the oil and the water are the immiscible pair of the liquids.
Therefore, the water and the ethanol are the miscible liquids as they both are dissolve in each other of the other and will forms the homogeneous mixture.
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The chemical symbols of several elements are provided. Give the corresponding name of the element. Spelling counts. K: ___Mn: __Ge: ___Kr____
The chemical names are, K: Potassium, Mn: Manganese, Ge: Germanium, Kr: Krypton.
Chemical symbols are shorthand notations used to represent the chemical elements in a concise and standardized manner. They consist of one or two letters, usually derived from the name of the element, and are used in chemical formulas, equations, and other types of chemical notation.
For example, the symbol K represents the element potassium, which has an atomic number of 19 and a chemical symbol of K derived from its Latin name kalium. Similarly, Mn represents the element manganese, which has an atomic number of 25 and a symbol derived from its Greek name magnesia.
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--The complete question is, The chemical symbols of several elements are provided. Give the corresponding name of the element.
K
Mn
Ge
Kr--
How many calories of heat (energy) would it take to heat 23.0 g of water from 35.0 °C to 59.0 °C?
q= cal
How many kilocalories of heat (energy) would it take to heat 107.0 g of water from 23.0 °C to 85.0 °C?
q= kcal
24940 kcal ,calories of heat (energy) would it take to heat 23.0 g of water from 35.0 °C to 59.0 °C.
What are calories in food?Calories are the amount of energy released when your body breaks down (digests and absorbs) food. The more calories a food has, the more energy it can provide to your body. When you eat more calories than you need, your body stores the extra calories as body fat.
How to burn calories?Moderate aerobic exercise includes activities such as brisk walking, biking, swimming and mowing the lawn. Vigorous aerobic exercise includes activities such as running, heavy yardwork and aerobic dancing. Strength training. Do strength training exercises for all major muscle groups at least two times a week.
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the overall photosynthesis reaction is , 6 CO2 (g) + 6 H2O (l) ? C6H12O6 (s) + 6 O2 (g) ?H° = +2802 kJ
suppose that the reaction is at equilibrium. state the effect that each of the following changes will have on the equilibrium composition: tends to shift toward the formation of reactants, tends to shift toward the formation of products, or has no effect. (a) the partial pressure of is increased. (b) the system is compressed. (c) the amount of is increased. (d) the temperature is increased. (e) some of the is removed. (f) water is added. (g) the partial pressure of is decreased.
a) If the partial pressure of CO2 is increased, the equilibrium will tend to shift towards the formation of products (C6H12O6 and O2) to reduce the concentration of CO2.
(b) If the system is compressed, the equilibrium will tend to shift towards the formation of products (C6H12O6 and O2) to reduce the number of gas molecules.
What is Equilibrium?
In chemistry, equilibrium is a state in a chemical reaction where the rate of the forward reaction is equal to the rate of the reverse reaction. At equilibrium, the concentrations of the reactants and products remain constant over time, although the reactants are still being converted into products and vice versa.
When a system is at equilibrium, the concentrations of reactants and products are said to be in balance. This means that the concentrations of the reactants and products are no longer changing, even though the reaction is still ongoing. At equilibrium, the concentrations of reactants and products are related by a constant called the equilibrium constant (K), which depends on the specific reaction conditions such as temperature and pressure.
c) If the amount of H2O is increased, the equilibrium will tend to shift towards the formation of products (C6H12O6 and O2) to consume the excess water.
(d) If the temperature is increased, the equilibrium will tend to shift towards the formation of products (C6H12O6 and O2) because the reaction is endothermic and increasing the temperature favors the endothermic reaction.
(e) If some of the O2 is removed, the equilibrium will tend to shift towards the formation of products (C6H12O6 and O2) to compensate for the loss of O2.
(f) If water is added, the equilibrium will tend to shift towards the formation of reactants (CO2 and H2O) to consume the excess water.
(g) If the partial pressure of O2 is decreased, the equilibrium will tend to shift towards the formation of reactants (CO2 and H2O) to compensate for the loss of O2.
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A reaction has a rate constant of 3.76 x 10-6 s-¹ at 362 K and a rate constant of 4.36 x 10² s¹ at 541 K. What is the
activation energy for the reaction based on the Arrhenius equation?
How to find the mole ratio of H3PO4 to H2O
The mole ratio of one reactant to the other can be determined from the balanced chemical equation of the reaction. Here, the ratio of H₃PO₄ to water is 1 : 3.
What is mole ratio ?The mole ratio of a reactant in a reaction is the ratio of its number of moles needed for the reaction to the number of moles of other reactant. The balanced chemical equation of a reaction represents the prefect stoichiometry of all the reactants and products.
The reaction between phosphoric acid and water can be written as follows:
[tex]\rm H_{3}PO_{4} + 3 H_{2}O \rightarrow PO_{4}^{-} + 3H_{3}O^{+}[/tex]
As per this balanced reaction, one mole of phosphoric acid requires 3 moles of water for complete reaction. The reaction gives one mole of phosphate ion and 3 moles of hydronium ions.
Therefore, the mole ratio of H₃PO₄ to H₂O is 1: 3.
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Why does the pressure of a gas increase when the temperature of the gas is increased? Select all that apply. Choose one or more: A. The increase in temperature causes more collisions of the gas particles with the walls. B. As the temperature of the gas increases, the gas particles increase in size causing a higher pressure. O C. The average kinetic energy of the gas increases as the temperature increases, causing more energetic collisions with the walls. D. As the temperature of the gas increases, the volume of the gas decreases causing the pressure to increase.
The pressure of a gas increases when the temperature of the gas is increased because of two main reasons:
A. The increase in temperature causes more collisions of the gas particles with the walls, and
C. The average kinetic energy of the gas increases as the temperature increases, causing more energetic collisions with the walls.
As the temperature of a gas increases, the average kinetic energy of the gas particles also increases. This causes the gas particles to move faster and collide with the walls of the container more frequently and with greater force. These more frequent and energetic collisions result in an increase in the pressure of the gas.
It is important to note that option B is not correct because the size of the gas particles does not increase as the temperature increases. Option D is also not correct because the volume of the gas does not decrease as the temperature increases unless the gas is in a closed container and the pressure is kept constant.
In conclusion, the pressure of a gas increases when the temperature of the gas is increased due to an increase in the frequency and energy of the gas particle collisions with the walls of the container.
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PLS SOMONE HELP I KNOW THE PHOTO ISNT THAT GOOD BUT I REALLY NEED HELP I WILL MARK AS BRAINLIEST AND GIVE 5 STARS ASWELL AS A HEART PLSS
CAN SOMEONE HELP WITH THIS QUESTION?✨
The theoretical yield of lead (II) nitrate obtained from the reaction is 0.50 grams
How do I determine the theoretical yield of lead (II) nitrate?The theoretical yield of lead (II) nitrate obtained from the reaction can be obtained
PbCO₃ + 2HNO₃ -> Pb(NO₃)₂ + H₂O + CO₂
Molar mass of PbCO₃ = 267.21 g/molMass of PbCO₃ from the balanced equation = 1 × 267.21 = 267.21 g Molar mass of Pb(NO₃)₂ = 331.2 g/molMass of Pb(NO₃)₂ from the balanced equation = 1 × 331.2 = 331.2 gFrom the balanced equation above,
267.21 g of PbCO₃ reacted to produce 331.2 g of Pb(NO₃)₂
Therefore,
4.0 g of PbCO₃ will react to produce = (4 × 331.2) / 267.21 = 0.50 g of Pb(NO₃)₂
Thus, we can conclude that the theoretical yield of Pb(NO₃)₂ is 0.50 grams
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____________ occur when partially positive ____________ attract partially negative atoms nearby. Examples include the ____________ .
"Hydrogen bonds occur when partially positive hydrogen atoms attract partially negative atoms nearby. Examples include the bonds between water molecules, ammonia molecules, and DNA base pairs."
Hydrogen bonds are a type of intermolecular force that occurs when a hydrogen atom that is covalently bonded to an electronegative atom (such as nitrogen, oxygen, or fluorine) interacts with another electronegative atom nearby.
The hydrogen atom has a partial positive charge because it is less electronegative than the other atom it is bonded to, while the other atom has a partial negative charge because it is more electronegative.
Hydrogen bonds are important for many biological processes, including the structure of DNA and the properties of water. The bonds between water molecules, for example, are hydrogen bonds that contribute to the high boiling point, surface tension, and other unique properties of water.
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Rank the given compounds based on their relative Bronsted acidities. strongest Bronsted acid H - NH2 H - CH3 H - Cl H - F weakest Bronsted acid H - SH
given compounds based on their relative Bronsted acidities are: H - F < H - Cl < H - NH2 < H - CH3 < H - SH
What is Bronsted acidities?
Bronsted acidities is a common concept in chemistry which describes the ability of an acid to donate a proton (H+) to a base. This is based on the Bronsted-Lowry Theory which states that an acid is a substance that donates a proton and a base is a substance that accepts a proton. Acids are typically characterized by their acidity constants, which measure the amount of acidity in a solution. Bronsted acidities can range from very weak (like citric acid) to very strong (like hydrochloric acid). Bronsted acidities can be measured in terms of pH, which is a measure of hydrogen ion concentration.
Therefore, given compounds based on their relative Bronsted acidities are: H - F < H - Cl < H - NH2 < H - CH3 < H - SH
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which of the following compounds dissovled in water would exhibit hydrogen bonding between the solute and solvent
CH3OH and NH3 would exhibit hydrogen bonding between the solute and solvent.
Hydrogen bonding occurs when hydrogen atoms in a molecule are attracted to electronegative atoms in another molecule. In water the electronegative oxygen atoms are capable of forming hydrogen bonds with molecules that contain hydrogen atoms bonded to electronegative atoms such as nitrogen, oxygen or fluorine.
CH3OH (methanol) and NH3 (ammonia) both contain hydrogen atoms bonded to electronegative atoms: allowing them to form hydrogen bonds with water molecules. H2, CO2 and NaCl do not contain hydrogen atoms bonded to electronegative atoms and therefore cannot form hydrogen bonds with water molecules.
This question should be provided as:
Which of the following compounds dissolved in water would exhibit hydrogen bonding between the solute and solvent?
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When trying to measure the density of your solution, you do not quantitatively transfer the solution (there is still some in the graduated cylinder when you obtain the volume in Part D). How will this error affect the calculated density (will the resulting calculated density be too high, too low or unaffected)?
If you do not quantitatively transfer the solution and there is still some in the graduated cylinder when you obtain the volume in Part D, the resulting calculated density will be too high.
This is because the volume you measure will be lower than the actual volume of the solution, but the mass will remain the same.
Since density is calculated by dividing mass by volume (density = mass/volume), a lower volume will result in a higher calculated density.
Therefore, it is important to accurately transfer and measure the solution in order to obtain an accurate calculation of density.
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48g of Magnesium reacts with excess oxygen to produce 84g of magnesium oxide. Calculate how much magnesium oxide would be produced if 2g, 10, and 4kg were reacted with excess oxygen. 0.4 Moles of iron reacts with 0.3 moles of oxygen gas. Calculate the formula of the iron oxide produced and write a balanced equation for it.
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1. The mass of magnesium oxide produced would be 6630.5 g.
2. The formula of the iron oxide would be Fe2O3.
Stoichiometric problem1. Calculation of magnesium oxide produced:
The balanced chemical equation for the reaction of magnesium with oxygen is:
2 Mg + O2 → 2 MgO
For 2 g of magnesium:
Number of moles of Mg = mass / molar mass = 2 / 24.31 = 0.082 moles
According to the balanced equation, 2 moles of Mg produce 2 moles of MgO
Therefore, 0.082 moles of Mg will produce 0.082 moles of MgO
Mass of MgO = number of moles of MgO * molar mass of MgO = 0.082 * 40.31 = 3.29 g
For 10 g of magnesium:
Number of moles of Mg = mass / molar mass = 10 / 24.31 = 0.411 moles
According to the balanced equation, 2 moles of Mg produce 2 moles of MgO
Therefore, 0.411 moles of Mg will produce 0.411 moles of MgO
Mass of MgO = number of moles of MgO * molar mass of MgO = 0.411 * 40.31 = 16.54 g
For 4 kg of magnesium:
Number of moles of Mg = mass / molar mass = 4000 / 24.31 = 164.5 moles
According to the balanced equation, 2 moles of Mg produce 2 moles of MgO
Therefore, 164.5 moles of Mg will produce 164.5 moles of MgO
Mass of MgO = number of moles of MgO * molar mass of MgO = 164.5 * 40.31 = 6630.5 g or 6.63 kg
2. Calculation of formula of iron oxide produced:
The balanced chemical equation for the reaction between iron and oxygen is:
4 Fe + 3 O2 → 2 Fe2O3
According to the equation, 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3. Therefore, the molar ratio of Fe to O2 is 4:3.
Given that 0.4 moles of Fe react with 0.3 moles of O2, the ratio of Fe to O2 in the reaction is:
Fe:O2 = 0.4/0.3 = 4/3
This ratio is equivalent to the molar ratio in the balanced equation, which means that the reaction produces the stoichiometric amount of Fe2O3. Therefore, the formula of the iron oxide produced is Fe2O3.
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A balloon takes up 625L at 0°C. If it is heated to 80°C, what will its new volume be?
What is the reaction order at each temperature? The following data were obtained for the decomposi- tion of nitrogen dioxide. 2NO2(g) 2NO(g) O2 (g) Pressure of NO2 (torr) Time (s) 310K 315 K 0 24.0 24.1 18.1 15.22 13.7 9.7 3 10.3 6.1 4 7.8 3.9 5 5.9 2.56 4.5 1.6 7 3.4 1.0 8 2.6 0.6 9 1.9 0.4 10 1.5 0.3 Select one or more a. Reaction order at 310 K: 0 b. Reaction order at 310 K: 1 c. Reaction order at 310 K: 2 d. Reaction order at 315 K: 0 e. Reaction order at 315 K: 1 f Reaction order at 315 K: 2
Ea = 7.7289*104 J/mol ≈ 7.73*104 J/mol is the correct answer. Activation energy is the minimum amount of energy needed for a chemical reaction to occur. It is measured in units of J/mol or KJ/mol and is visualized as a barrier that the reactant molecules must overcome to form products.
What is Activation energy ?Activation energy is the minimum amount of energy required for a chemical reaction to occur. It is the energy needed to break the bonds in the reactant molecules and form new bonds in the product molecules. The activation energy is usually denoted as Ea and is measured in units of joules per mole (J/mol) or kilojoules per mole (kJ/mol).
The activation energy can be visualized as a barrier that the reactant molecules must overcome in order to form products. The higher the activation energy, the more difficult it is for the reaction to occur. For a reaction to take place, the reactant molecules must collide with enough energy to break the bonds and form the new bonds. The activation energy is the minimum energy required for this to happen.
ln (0.4483 s-1/0.2785 s-1) = Ea/R*(1/310 – 1/315) K-1
===> ln (1.6097) = Ea/R*(5.1203*10-5) K-1
===> 0.476 = Ea/R*(5.1203*10-5 K-1)
===> Ea = (0.476)*(8.314 J/mol.K)/(5.1203*10-5 K-1)
===> Ea = 7.7289*104 J/mol ≈ 7.73*104 J/mol (ans).
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