Answer:
New molarity = M₂ = 0.167 M
Explanation:
Given data:
New molarity = M₂ = ?
Final volume = V₂ = 100mL + 20 mL = 120 mL
Initial volume =M₁ = 100 mL
Initial molarity =V₁ = 0.2 M
Solution:
M₁V₁ = M₂V₂
0.2 M × 100 mL = M₂ × 100 mL
M₂ = 0.2 M × 100 mL/120 mL
M₂ = 20 M.mL/120 mL
M₂ = 0.167 M
Which unit is used to express a amount of thermal energy
Answer:
Joule
Explanation:
Answer:
The calorie
Explanation: as the amount of thermal energy necessary to raise the temperature of one gram
Which of the following is the correct Lewis dot diagram for Br found in LiBr.
A. [Br]*
B. [Br]
C. (Br:11
D. [Br:1
Ο Α
B
Ос
Draw the structures of cyclohexane and benzene. Show all hydrogen atoms. Cyclohexane, C6H12 (six C in a ring) Benzene, C6H6 (six C in a ring)
Answer:
See attached picture.
Explanation:
Hello!
In this case, considering that the cyclohexane has six carbon atoms and therefore twelve hydrogen atoms in its structure because it has no double bonds unlike benzene which actually has three and therefore it has six carbon atoms but six hydrogen atoms, on the attached picture, you will see the structure of both hydrocarbons as required, considering that each carbon atom must have four bonds in order to complete the corresponding octets.
Best regards!
The survival of aquatic organisms depends on the small
amount of O2 that dissolves in H2O. The diagrams above
represent possible models to explain this phenomenon. Which
diagram provides the better particle representation for the
solubility of O2 in H20, and why?
Answer:
Explanation:
Diagram 2! Because the polar H2O molecules can induce temporary dipoles on the electron clouds of 02 molecules.
Enter the balanced net ionic equation for the potentially unbalanced equation NH4Cl(aq)+NaOH(aq)→H2O(l)+NH3(g)+NaCl(aq).
Answer:
NH₄⁺ (aq) + OH⁻ (aq) → H₂O (l) + NH₃ (g)
General Formulas and Concepts:
Chemistry - Solutions
Solubility RulesReaction PredictionCompound statesExplanation:
Step 1: RxN
NH₄Cl (aq) + NaOH (aq) → H₂O (l) + NH₃ (g) + NaCl (aq)
Step 2: Balance RxN
NH₄Cl (aq) + NaOH (aq) → H₂O (l) + NH₃ (g) + NaCl (aq)
1 N on each side5 H on each side1 Cl on each side1 Na on each side1 O on each sideAlready balancedStep 3: Ionic Equations
Total Ionic Equation
Break up aqueous solutions.
NH₄⁺ (aq) + Cl⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → H₂O (l) + NH₃ (g) + Na⁺ (aq) + Cl⁻ (aq)
Net Ionic Equation
Cancel out spectator ions.
NH₄⁺ (aq) + OH⁻ (aq) → H₂O (l) + NH₃ (g)
The combustion of ethane (C2H6) produces carbon dioxide and steam.
2C,H, (g) + 702(g) — 4CO2(g) + 6H2O(g)
How many moles of Co, are produced when 5.55 mol of ethane is burned in an excess of oxygen?
moles of CO2:
Answer:
Number of moles of CO₂ produced = 11.1 mol
Explanation:
Given data:
Mass of ethane = 5.55 mol
Number of moles of CO₂ produced = ?
Solution:
Chemical equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Now we will compare the moles of ethane and carbondioxide.
C₂H₆ : CO₂
2 : 4
5.55 : 4/2×5.55 = 11.1 moles
Number of moles of CO₂ produced = 11.1 mol
How much heat energy is required to melt 25.0 g of Aluminum at its melting point, 658°C? (The Hf of Al is 94.4 joules/gram)
Answer:
2360J
Explanation:
Given parameters:
Mass of aluminum = 25g
Melting point = 658°C
Latent heat of melting = 94.4j/g
Unknown:
Amount of heat require for melting = ?
Solution:
The amount of heat required for this melting will be the product of the mass of the aluminum and the latent heat of melting;
H = m L
m is the mass
L is the latent heat of melting
Insert the parameters and solve;
H = 25 x 94.4 = 2360J
Question 9 (5 points)
What is a boundary where cold air and warm air meet?
a
air pressure
b
air mass
C
front
d
precipitation
Answer:
A. air pressure,this is answer.
Small or even large mountainous areas that have had long droughts or who have had many wildfires are prone to mudslides because many plants are destroyed during those processes. Mudslides are when large amounts of water accumulate rapidly in the soil in mountainous areas. The soil becomes over saturated with water and gravity causes the water-soaked soil to “run down” the mountain in a river like behavior. Without plants and their root systems to hold the soil in place, the soil gets washed away during rail storms. Which natural process causes these mudslides and washes away the soil?
2. Write a statement that relates chain length and boiling point.
3. Write a statement that relates polarity and solubility in water
4. Write a statement that relates polarity and solubility in oil
Answer:
Higher chain length, higher boiling point
Polar species are soluble in similar polarity water, Non polar species are soluble in similar non polar oil.
Explanation:
Chain length refers to the number of carbons. As it increases, boiling points of alkanes increase for these compounds. Reason behind is that longer chain molecules become more entangled along with each other.
Polarity bonds atoms together, by chemical bonding - through sharing seperated electric charge ie electrons. Polar Solvents have large dipole moments, contain bonds between atoms with different electro negativities. Non Polar solvents contain bonds between atoms with similar electro negativities.
Polar species are soluble in water, as it is from same category. Non Polar species are soluble in oil, as it is from same category. Substances with same polarity are soluble in each other, substances with different polarities are different from each other.Which are characteristics of metals that result from their bonding? Check all that apply.
ANSWER: Conduct Electricity and Are Malleable, 2 and 4
Answer:
Conduct Electricity and Are malleable
Explanation:
Answer:
conduct electricity
are malleable
Explanation:
Metals conduct electricity because they have “free electrons.” Unlike most other forms of matter, metallic bonding is unique because the electrons are not bound to a particular atom. This allows the delocalized electrons to flow in response to a potential difference.
And since metals don't tightly hold on to electrons during metallic bonding, they are easily replaced. In metallic bonding, electrons are delocalized and move freely among nuclei. When a force is exerted n the metal, the nuclei shift, but the bonds do not break, giving metals their characteristic malleability.
2. Click on the bucket to raise the temperature of the container to approximately 400 K (127°C). What happened to the pressure?
Answer:
Increased, 7.5-8.3
Decreases, 3.5-4.3
Gay Lussacs law
Explanation:
There are so many laws for ideal gas at constant temperature , at constant pressure, the law at constant volume is called Gay-Lussac's law. Therefore, on increasing temperature to approximately 400 K (127°C), the pressure will also increase.
What is Gay-Lussac's law?According to this law, pressure is directly proportional to temperature. This gas law is valid only to ideal gas not on the vanderwaal gas. Since it is mentioned in the question that volume is constant we can apply Gay-Lussac's law over here.
Mathematically
P₁T₂=P₂T₁
Since according to this law, pressure is directly proportional to temperature, so on increasing temperature to approximately 400 K (127°C), the pressure will also increase.
Therefore, on increasing temperature to approximately 400 K (127°C), the pressure will also increase.
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A 7.12 L cylinder contains 1.21 mol of gas A and 4.94 mol of gas B, at a temperature of 28.1 °C. Calculate the partial pressure of each gas in the cylinder. Assume ideal gas behavior.
Answer:
[tex]P_A=4.20atm\\\\P_B=17.1atm[/tex]
Explanation:
Hello!
In this case, since the equation for the ideal gas is:
[tex]PV=nRT[/tex]
For each gas, given the total volume, temperature (28.1+273.15=301.25K) and moles, we can easily compute the partial pressure as shown below:
[tex]P_A=\frac{n_ART}{V} =\frac{1.21mol*0.082\frac{atm*L}{mol*K}*301.25K}{7.12L} \\\\P_A=4.20atm\\\\P_B=\frac{n_BRT}{V} =\frac{4.94mol*0.082\frac{atm*L}{mol*K}*301.25K}{7.12L} \\\\P_B=17.1atm[/tex]
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Circle the word that correctly completes each sentence as it relates to a battery (voltaic cell). a. The positive electrode is the (cathode anode b. The cathode / anode) is the site of the oxidation half-reaction. c. Electrons flow out of the cathode / anode) and into the (cathode 1 anode). d. The metal piece that is used for the cathode anode) is the reducing agent. g
Answer:
a) anode
b) anode
c) cathode
d) anode
What is the molality of a solution prepared by dissolving 150.0 g C6H12O6 in 600.0 g of H2O?
Answer:
50/36 = 25/18
Explanation:
Solution at attachment box
Molality = mole of dissolvable (this question glucose) / kg of water
Answer:
Molality = 1.38 mol/Kg
Explanation:
Given data:
Molality of solution = ?
Mass of C₆H₁₂O₆ = 150.0 g
Mass of water = 600.0 g (600 g ×1 kg/1000 g= 0.6 Kg)
Solution:
Number of moles of C₆H₁₂O₆:
Number of moles = mass/molar mass
Number of moles = 150.0 g/180.16 g/mol
Number of moles = 0.83 mol
Molality:
Molality = moles of solute / kg of solvent
Molality = 0.83 mol /0.6 Kg
Molality = 1.38 mol/Kg
HELP
1. A chemical needs 0.22 moles CaO for a chemical reaction. How many grams of CaO do they need to obtain that amount?
2. What is the mass of 0.83 moles of NaCl?
3. For an acid-base titration, 0.5 moles of H2SO4 will be needed. How many grams of H2SO4 were needed for the Laboratory Activity?
Answer:
Explanation:
1.
Given parameters:
Number of moles of CaO = 0.22moles
Unknown:
Mass of CaO = ?
Solution:
Mass, number of moles and molar mass are related using the expression below;
Mass = number of moles x molar mass
Molar mass of CaO = 40 + 16 = 56g/mol
Insert the parameters and solve;
Mass = 0.22 x 56 = 12.32g
2
Given parameters:
Number of moles of NaCl = 0.83moles
Unknown:
mass of NaCl = ?
Solution:
Also,
Mass = number of moles x molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Now insert the parameters and solve;
mass = 0.83 x 58.5
mass = 48.6g
3.
Given parameters:
Number of moles of H₂SO₄ = 0.5moles
Unknown:
mass of H₂SO₄ = ?
Solution:
Mass = number of moles x molar mass
Molar mass of H₂SO₄ = 2(1) + 32 + 4(16) = 98g/mol
Insert the parameters and solve;
Mass = 0.5 x 98 = 49g
Which of the following properties of a photon are required to calculate the energy emitted by an electron returning to its ground state?
A. wavelength
B. frequency
C. either A or B
D. both A and B
Answer:
C. either A or B
Explanation:
To calculate the energy of a photon returning to its ground state, we required either the frequency or the wavelength. Often times, not both.
The wavelength of a photon can be derived by;
E = hf
or
E = [tex]\frac{hc}{wavelength}[/tex]
h is the Planck's constant
c is the speed of light
f is the frequency
Which contribution added to rutherfords discovery of a positive nucleus atoms are invisible electrons are scattered in an atom neutrons are inside the nucleus of An atom atoms of the same element have the same properties
Answer:
neutrons are inside the nucleus
Explanation:
The most significant contribution that added to Rutherford's discovery of a positive nucleus is that neutrons are also inside the nucleus.
The discovery of neutrons as a nuclear particle was instrumental to Rutherford's discovery. Since during his experiment, the alpha particles were deflected partly, he suggested a massive nucleus made up of just protons. With the discovery of the neutron, the mass of the nucleus was enough to cause the deflection.QUICK I WILL CHOOSE BRAILEST
What is convection?
1. Transfer of heat through objects touching source
2. Transfer of heat through direct physical contact
3. Transfer of heat through electromagnetic waves
4. Transfer of heat through the movement of particles
Answer:
C
Explanation:
Answer:
4. Transfer of heat through the movement of particles
Explanation:
because it goes in a circular motion
How much ice could be melted at 0°C if 5200 joules of heat were added?
Answer:
0.02kg
Explanation:
Given parameters:
Amount of heat = 5200J
Unknown:
Mass of ice that would be melted at 0°C = ?
Solution:
To solve this problem, use the expression below;
H = mL
H is the heat
m is the mass
L is the latent heat of fusion of ice = 3.33 x 10⁵ J/kg.
Insert the parameters and solve for m;
5200 = m x 3.3 x 10⁵
m = [tex]\frac{5200}{3.33 x 10^{5} }[/tex] = 0.02kg
It is cold and wet outside. Pam is wearing a wool hat and fur lined boots to help keep her warm. These pieces of clothing are good__.
Question 18 options:
A. conductors
B. heaters
C. insulators
D. thermometers
Answer:
c insulators
Explanation:
Answer:
C: Insulators
Explanation:
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When NaCl is dissolved in water, it separates into Na+ and CI-ions, which are also dissolved in water. How would the phase of the NaCl, the Na+, and the CI-
be written in the reaction equation?
A. (g)
B. (1)
C. (aq)
D.(s)
Answer:
C aq
Explanation:
Means desolves in water
When NaCl is dissolved in water, it separates into its constituent ions Na+ and Cl- ions. The phase of the ions are written as (aq) and that of NaCl is written as (s) .
What is NaCl ?Sodium chloride is an ionic compound formed by the transfer of electrons from the metal sodium to the nonmetal chlorine. It is used as the common table salt.
Na contains one valence electron and Cl contains 7 valence electrons. Hence, Na can donate that electron to Cl to achieve octet in both. When Na loss an electron it forms Na+ and Cl gains the electron to form Cl-. These two ions are then attracts to form the NaCl.
When NaCl is dissolved in water the bond between these two ions weaken and the ions gets released into the solution. The ions in the solution is indicated with the phase aqueous (aq) and the undissolved NaCl is in solid (s) state.
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Given the enthalpies of reaction
S(s)+O2(g)→SO2(g) ΔH = -297 kJ
2S(s)+3O2(g)→2SO3(g) ΔH=-791kJ
Calculate the enthalpy change (ΔH) for the following reaction using the data above and Hess's Law:
2SO2+O2⟶2SO3
2SO₂+O₂⇒2SO₃ ΔH=-197 kJ
Further explanationBased on the principle of Hess's Law, the change in enthalpy of a reaction will be the same even though it is through several stages or ways
Reaction
2SO₂+O₂⇒2SO₃
Given :
1. S(s)+O₂(g)→SO₂(g) ΔH = -297 kJ
Reverse
SO₂(g) ⇒S(s)+O₂(g ΔH = +297 kJ (sign change to +) x 2
2SO₂(g) ⇒2S(s)+2O₂(g ΔH = +594 kJ
2.2S(s)+3O2(g)→2SO3(g) ΔH=-791kJ
Add both reactions and remove/subtract the same compound for different sides
1. 2SO₂(g) ⇒2S(s)+2O₂(g) ΔH = +594 kJ
2.2S(s)+3O₂(g)→2SO₃(g) ΔH=-791kJ
--------------------------------------------------------+
2SO₂+O₂⇒2SO₃ ΔH=-197 kJ
A balloon contains 3300 mL of helium gas at 63 °C. What is the final volume, in milliliters, of the gas when the temperature changes to each of the following, if pressure and amount of gas do not change? Part A 78 C Express your answer to two significant figures and include the appropriate units. UA Vi= Value Units
The final volume : 3.4 L
Further explanationCharles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
V₁=3300 ml
T₁=63 + 273=336 K
T₂=78+273=351 K
the final volume :
[tex]\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{3300\times 351}{336}\\\\V_2=3447.3~ml\rightarrow 2~sig.~fig.\rightarrow 3.4~L[/tex]
What is the molar mass of AlCl3?
A. 62.43 g/mol
B. 116.39 g/mol
C. 124.86 g/mol
D. 133.33 g/mol
E. 187.29 g/mol
Answer:
133.33 g/mol
Explanation:
Molar mass:
Molar is the sum of all the atomic masses of the atoms of the elements present in a compound.
Molar mass of AlCl₃:
Atomic mass of Al = 26.98 amu
Atomic mass of chlorine = 35.45 amu
There are 3 atoms of chlorine present.
35.45×3 = 106.35
Molar mass of AlCl₃ = 26.98 + 106.35 = 133.33 g/mol
The molar mass of AlCl₃ is 133.33 g/mol.
What is molar mass?Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
Atomic mass of Al = 26.98 amu
Atomic mass of chlorine = 35.45 amu
There are 3 atoms of chlorine present.
35.45 × 3 = 106.35
Molar mass of AlCl₃ = 26.98 + 106.35 = 133.33 g/mol
Thus, the molar mass of AlCl₃ is 133.33 g/mol.
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definition of instantaneous speed
Answer:
Explanation:
The instantaneous speed is the speed of an object at a particular moment in time. And if you include the direction with that speed, you get the instantaneous velocity.
Assuming that seawater is an aqueous solution of NaCl, what is its molarity? The density of seawater is 1.025 g/mL at 20 ∘C, and the NaCl concentration is 3.50 mass %.
Answer:
0.6139M
Explanation:
A 3.50% by mass of NaCl means there are 3,50g of NaCl in 100g of solution. To find molarity we need to convert the mass of NaCl to moles and mass of solution to liters as follows:
Moles NaCl -molar mass: 58.44g/mol-:
3.50g NaCl * (1mol / 58.44g) = 0.05989 moles of NaCl
Liters solution:
100g solution * (1mL / 1.025g) * (1L / 1000mL) = 0.09756L of solution
Molarity -Ratio of moles and liters-:
0.05989 moles of NaCl / 0.09756L of solution =
0.6139MHow many molecules of oxygen are in 3.0 moles of oxygen?
Answer:
There are 18 moles of oxygen in 3.0 mole of glucose...
Explanation:
Does it help???
Answer:
18.066× 10²³ molecules
Explanation:
Given data:
Number of moles of oxygen = 3.0 mol
Number of molecules = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
3 mol × 6.022 × 10²³ molecules / 1 mol
18.066× 10²³ molecules
HELP!!!!!!
I DON'T KNOW THE ORDER!!
Answer:
for 1 solid its freezing.
for 2 solid and liquid its melting
for 6 liquid to gas its evaporation and for 5 gas to liquid its condensation.
Explanation:
hope this helped :)
Answer:
solid->liquid= melting
liquid->solid= freezing
gas->liquid= consendation
liquid->gas= evaporation
What is Scrooge’s “business” according to his interaction with the men? Why does he feel this way
Answer:
Ebenezer Scrooge's business is to take care of his own establishment and thus, refused to donate/ contribute any to the charity.
He feels this way because he thinks that it is not one's business to interfere in another's business.
Explanation:
Charles Dickens's play "A Christmas Carol," tells the story of the protagonist Ebenezer Scrooge and his 'hatred' of the Christmas festival. But it was during this time of the year that he got 'inspired' by the ghost of his late partner c um friend Marley, teaching him a life lesson that changed Scrooge for the better.
When the two gentlemen came to visit the workplace of Scrooge expecting some donation for charity, Scrooge refused to give a single penny. According to him, the suffering of the people and their need is none of his business. He exclaims "I don’t make merry myself at Christmas and I can’t afford to make idle people merry. I help to support the establishments I have mentioned—they cost enough; and those who are badly off must go there." Rather, his business is to take care of his company, which "occupies [him] constantly" and thus, it's not his business to "not to interfere with other people’s".
he felt this way because he thinks that it is "unfair" and unbecoming to get involved in someone's business.