Answer:
The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation.
How many grams are there in 1.1 x 1027 molecules of water (H2O)?
7. How many grams
(A) 1.0 x 104 grams
(B) 1.0 x 10-1 grams
(C) 3.3 x 104 grams
(D) 3.9 x 104 grams
Answer:
C) 3.3 x 104 grams
Explanation:
1 mole of water contains 6.02 × 10^23 atoms
1.1 × 10^27 atoms will contain;
1.1 × 10^27 ÷ 6.02 × 10^23
= 0.1827 × 10^( 27 - 23)
= 0.1827 × 10^(4)
= 1.827 × 10³ moles of water.
To convert mole to mass in grams, we use the formula;
mole (n) = mass (m) ÷ molar mass (MM)
Molar mas of water (H2O) = 1(2) of H + 16 of O = 18g/mol
mole = mass/molar mass
1.827 × 10³ = mass / 18
mass = 1.827 × 10³ × 18
mass = 32.886 × 10³
mass = 3.286 × 10⁴
mass = 3.3 × 10⁴ grams
A certain mass of nitrogen gas occupies a volume of 7.56 L at a pressure of 5.08 atm. At what pressure will the volume of this sample be 9.94 L?
Answer:
P₂ = 3.86 atm .
Explanation:
We assume that during this change , the temperature of the gas remains constant .
So the gas will obey Boyle's law .
P₁ V₁ = P₂V₂
5.08 x 7.56 = P₂ x 9.94
P₂ = 3.86 atm .
Nitrogen gas was considered ideal in nature. The pressure of the gas at which the volume is 9.94 L is 3.84 atm.
What is Boyle's law?Boyle's law was applied to give the relationship between the pressure and the volume of a gas at a constant temperature.
The relationship can be given as:
[tex]P_1V_1=P_2V_2[/tex]
The initial pressure of the gas, [tex]P_1=5.08\;\rm atm[/tex]
The initial volume of the gas, [tex]V_1=7.56\;\rm L[/tex]
The final volume of the gas, [tex]V_2=9.94\;\rm L[/tex]
Substituting the values, final pressure ([tex]P_2[/tex]) is given as:
[tex]5.05\;\times\;7.56=P_2\;\times\;9.94\\\\P_2=\dfrac{5.05\;\times\;7.56}{9.94} \\\\P_2=3.84\;\rm atm[/tex]
The final pressure of the nitrogen gas with the increase in volume is 3.84 atm.
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Answer the question plssss
Answer: warmer because its an exothermic reaction.
Explanation: the passage states as the products form thermal energy is absorbed thermal means heat also carbon dioxide creates bubbles
A closed container in lab contains a sample of oxygen gas. When the temperature in lab is 16.3 degrees Celcius, the pressure in the container is 9.30 atm. What would the temperature in lab be (in Celcius) if the pressure in the container was 17.7 atm? Assume the mol and volume of the container are constant. Record your answer as a number with the correct significant figures.
Answer:
T₂ = 550.60 K
Explanation:
Given data:
Initial temperature = 16.3°C (16.3+273 = 289.3 K)
Initial pressure = 9.30 atm
Final temperature = ?
Final pressure = 17.7 atm
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
9.30 atm / 289.3 K = 17.7 atm/T₂
T₂ = 17.7 atm × 289.3 K / 9.30 atm
T₂ = 5120.61 atm. K /9.30 atm
T₂ = 550.60 K
2. Calculate the enthalpy of the following chemical reaction:
Dalta H rxn =?
CS (l) + 3O2(8) ---> CO2(g) + 2SO (g)
Given:
C(s) + O2(g) ---> CO2(g)
S(s) + O2(g) --> SO2(g)
C(s) + 2S(s)---> CS (1)
DaltaH = -393.5 kJ/mol
DaltaH = -296.8 kJ/mol
DaltaH = +87.9 kJ/mol
The enthalpy of the chemical reaction: ΔH rxn = -1075 kJ/mol
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
CS₂ (l) + 3O₂(g) ---> CO₂(g) + 2SO₂ (g)
1. C(s)+O₂(g)⇒CO₂(g) ΔH=-393.5 kJ/mol
2. S(s)+O₂(g)⇒SO₂(g) ΔH=-296.8 kJ/mol x 2
2S(s)+2O₂(g)⇒2SO₂(g) ΔH=-593.6 kJ/mol
3. C(s)+2S(s)⇒CS₂(l) ΔH=+87.9 kJ/mol
Reverse
CS₂(l)⇒C(s)+2S(s) ΔH=-87.9 kJ/mol
Add all and remove the same compound on different sides
C(s)+O₂(g)⇒CO₂(g) ΔH=-393.5 kJ/mol
2S(s)+2O₂(g)⇒2SO₂(g) ΔH=-593.6 kJ/mol
CS₂(l)⇒C(s)+2S(s) ΔH=-87.9 kJ/mol
---------------------------------------------------------------+
CS₂ (l) + 3O₂(g) ---> CO₂(g) + 2SO₂ (g) ΔH=-1075 kJ/mol
WHAT IS THE MOLAR MASS FOR AMMONIUM SULFIDE?
A. 59.1g/mol
B.82.2g/mol
C.50.1g/mol
Answer:
68g/mol
Explanation:
The formula of ammonium sulfide is:
Ammonium sulfide = (NH₄)₂S
The molar mass of a compound is the mass in gram of one mole of the substance. In a compound, it is expressed gram formula mass or gram-molecular weight.
It is determined by the addition of the component atomic masses and then expressed in grams;
Atomic mass of N = 14, H = 1 and S = 32
(NH₄)₂S = 2[14 + 4(1)] + 32 = 36 + 32 = 68g/mol
Calculate the number of kilojoules of energy required to convert 50.0 grams of solid DMSO initially at a temperature of 19.0°C to gas at 250.0°C.
Answer:
20.79 kilojoules
Explanation:
Using Q = m×c×∆T
Where;
Q = Quantity of heat (J)
c = specific heat capacity of solid DMSO (1.80 J/g°C)
m = mass of DMSO
∆T = change in temperature
According to the provided information, m= 50g, initial temperature = 19.0°C, final temperature= 250.0°C
Q = m×c×∆T
Q = 50 × 1.80 × (250°C - 19°C)
Q = 90 × 231
Q = 20790 Joules
To convert Joules to kilojoules, we divide by 1000 i.e.
20790/1000
= 20.79 kilojoules
Hence, 20.79 kilojoules of energy is required to convert 50.0 grams of solid DMSO to gas.
Oxygen is a reactant of___(1)___while being the product for___(2)___.
Answer:
Oxygen is a reactant of cellular respiration, while being the product for photosynthesis
Explanation:
Photosynthesis
carbon + water + sunlight -> oxygen and glucose
Cellular respiration
oxygen + glucose -> carbon + water + ATP
How are put carbon, oxygen, and hydrogen different from the compound ethanol which contains all three of those elements
All the elements such as carbon, oxygen, and hydrogen found in ethanol but when they are seperated from ethanol they have totally different compound. They are pure element and ethanol is a mixture.
What is ethanol?Ethanol is a colourless liquid which catches fire easily and it is produced by the process of natural fermentation of sugars or alcohol.
The chemical formula of ethanol is C2H5OH, molar mass is 46.07 g/mol and its boiling point is 78.37 °C with density 789 kg/m cube.
Ethanol is also known as alcohol which is colourless and slightly toxic chemical compound and ethanol forms water as well as carbon dioxide.Ethanol is a colourless liquid which catches fire easily and it is produced by the process of natural fermentation of sugars or alcohol.
Therefore, All the elements such as carbon, oxygen, and hydrogen found in ethanol but when they are seperated from ethanol they have totally different compound. They are pure element and ethanol is a mixture.
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Definition: A one or two letter abbreviation for a chemical element.
Example: Cu is copper.
Answer:
chemical symbol
Explanation:
Calculate the concentration of
4602g C12H22O11 in
528 g H₂O in mass percent
Answer:
see in explanation
Explanation:
Use mass of solute/mass of solution x 100
-48.2 gC12H22O11 / (528 gH2O + 48.2 gC12H22O11) x 100 = (48.2/ 576.2) x 100 = 8.37%
Everyone who is thin is in shape. A. True B. False
Answer:
false; one could be in thin shape but thay doesnt always mean they are healthy, or fit...there is always a chance there can be malnutrition or they have a good metabolism, but to be in shape, there should be a good balance of fat and muscle in the body
Answer:
False
Explanation:
16.025 has how many sig fig
Answer:
5
Explanation:
Significant figures:
The given measurement have four significant figures 1234.
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
In given measurement:
16.025 there are 5 significant figures 1,6,0,2,5
Xavier boiled 19 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
Answer:
19g
Explanation:
The mass of the steam produced in this phase change process will also be 19g. This is in compliance with the law of conservation of mass.
It states that "mass is neither created nor destroyed in a the cause of reaction". The law suggests that mass is conserved. When steam is heated, it does not lose its mass. The mass of the steam is still the same as that of water.Answer:
Xavier boiled 14 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
A.
28 g
B.
0 g
C.
24 g
D.
14g
Explanation:
What describes the behavior of an ideal gas?
A. It’s properties at absolute zero
B. The kinetic theory of gases
C. The phase diagram of the gas
D. The ideal gas law
Answer:
The answer is D
Explanation:
for a p e x
The ideal gas law describes the behavior of gases under ideal conditions.
What is the ideal gas law?It is a law that explains that an ideal gas is considered as part of the group of theoretical gases because it is composed of point particles that move randomly and do not interact with each other.
According to classical thermodynamics, this law is a formula that allows us to relate the properties of gases, such as pressure, the volume occupied by the gas and its temperature.
Therefore, we can conclude that the ideal gas law describes the behavior of gases under ideal conditions.
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Select the correct answer.
In which situation is no work being done?
OA.
a person carrying a box from one place to another
B.
a person picking up a box from the ground
a person pushing a box from one place to another
Ос.
D.
a person pulling a box from one place to another
Reset
Answer:
I think it is D
Explanation:
If you pull the box your weight is doing the work not your strength.
A 10.0 cm³ sample of copper has a mass of 89.6 g. What is the density of copper?
Answer:
d = 8.96 g/cm³
Explanation:
Given data:
Volume of sample = 10.0 cm³
Mass of copper = 89.6 g
Density of copper = ?
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
d = 89.6 g/ 10.0 cm³
d = 8.96 g/cm³
What else is produced during the combustion of butane, C4H10? 2C4H10 + 13O2 8________ + 10H2O H2O C4H10 CO2 O2
Answer:
CO2
Explanation:
took the test
Answer:
Co2
Explanation:
One of the following bonds is nonbonding intermolecular interaction Select one: a. ionic bond b. Van der Waals C. covalent bond d. polar bond
Answer:
b. Van der Waals
Explanation:
Non-bonding intermolecular interaction is simply the same as intermolecular forces between molecules.
One such example from the given choice is the van der waals forces.
Van der Waals forces are weak forces of attraction joining non - polar molecules together. They exist between layers of substances. They are often described as non-bonding intermolecular interaction.What do food webs show about an ecosystem
Answer:
Food webs describe the relationships, inks or connections, among species in an ecosystem, but the relationships vary in their importance to energy flow and dynamics of species populations. Some trophic relationships are more important than others in dictating how energy flows through ecosystems.
Which of the following acts as a catalyst in catalytic converters?
Metal acts as a catalyst in catalytic converters
What type of reaction is Mg + Cl2 → MgCl2?
O A. Decomposition
O B. Synthesis
O C. Double-replacement
O D. Single-replacement
The reaction Mg + Cl2 → MgCl2 is a synthesis reaction. Option B
What is a synthesis reaction?
We kno0w that in a chemical reaction there is the combination of two or more substances so as to get the product of the reaction. In this case there is the combination of the magnesium and the chlorine and the product is the magnesium chloride.
In the reaction, we have two substances that have been mixed together and then we have a single product that have been formed from the two. The formation of one product means that it is a synthesis reaction.
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How many moles of water would be produced from 3 moles of oxygen in the following reaction? Don’t forget to include units in your answer.
Answer:
6moles of water
Explanation:
Given parameters:
Number of moles of oxygen = 3moles
Reaction equation:
2H₂ + O₂ → 2H₂O
Unknown:
Number of moles of water formed = ?
Solution:
To solve this problem;
compare the number of moles in the reaction.
1 mole of oxygen gas will produce 2 mole of water
3 moles of oxygen gas will produce 3 x 2 = 6moles of water.
help me please ..............
Answer:
C
Explanation:
Answer:
Hey, you have to solve it by Stichiometry.....answer is option A.... I have explained every option for your understanding.
Explanation:
(a.)**For option A, the volume of CO2 produced at STP will be 5.6 not 30.8 by solving equation for part I
By Stichiometry,
moles of CO2, n=11.2/22.4 = 0.5
Volume of CO2, V=11.2×0.5 =5.6
(b.)**For option B, the statement is correct
n(moles) of O2 =32/32 = 1 mol
we have to use stichiometry to find moles of CO2
n= 1/2 × 1 (coefficient of CO2/coefficient of O2) × mol of O2 (coz O2 is limiting reagent in 2nd option)
n= 0.5 mol
Mass= n × Molecular Mass
Mass= 0.5 × 44
Mass= 22g
(c.)**option C, is correct acc. to statement
(d.)**option D, is correct acc. to statement
(e.)**option E, is correct acc. to statement
Answer to this question is A part.
Hope it helps......
How many moles of sulfur atoms are there in 5.0 g of sulfur?
Answer:
Number of moles = 0.153 mol
Explanation:
Given data:
Mass of sulfur = 5 g
Number of moles of sulfur atom = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of sulfur is 32. 065g/mol.
By putting values,
Number of moles = 5 g/ 32.06 g/mol
Number of moles = 0.153 mol
10. How many molecules of NH, could you make with 15 molecules of H2 and 4 molecules of Nz? What is
your limiting reactant? Which reactant is in excess?
15 molecules H2X
molecules NH
molecules H2
4 molecules N2 x
molecules NH3
molecules N2
Amount of NH, made:
Limiting reactant:
Excess reactant:
Limiting reactant : N₂
Excess reactant : H₂
amount of NH₃ : 8 molecules
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
[tex]\tt N_2+3H_2\rightarrow 2NH_3[/tex]
limiting reactant = smaller mol ratio
N₂[tex]\tt \dfrac{4}{1}=4[/tex]
H₂[tex]\tt \dfrac{15}{3}=5[/tex]
limiting reactant ⇒ N₂
The number of reacted H₂ molecules :
[tex]\tt \dfrac{3}{1}\times 4=12[/tex]
The remaining H₂ after the reaction :
[tex]\tt 15-12=3~molecules[/tex]
Amount of NH₃ :
[tex]\tt \dfrac{2}{1}\times 4=8~molecules[/tex]
If a friend is making lemonade from an instant mix, which set of conditions would lead to a faster rate of dissolving the mix in the pitcher of water?
Cold water and powdered lemonade
Cold water and lemonade tablets
Warm water and powdered lemonade
Warm water and lemonade tablets
Answer:
warm water and powdered lemonade
Explanation:
warm water will make it dissolve faster
Answer:
C
Explanation:
As a metal such as lead is heated past its melting point, what happens to the average kinetic energy of the atoms
Answer:
The kinetic energy increases
Explanation:
As a metal such as lead is heated past its melting point, the average kinetic energy of the atoms increases.
When temperature is increased the kinetic energy of the atoms increase which also increases the random movement of the atoms.
When such happens the distance between the atoms is usually decreased which leads to the elastic collision that occurs.
The element fluorine forms a(n) _______ with the charge__________ . The symbol for this ion is____________ , and the name is _____________. The number of electrons in this ion is__________
Answer:
A chemical element exhibiting the symbol F and atomic number 9 is fluorine. It prevails as an extremely toxic pale yellow diatomic gas at normal circumstances and is the lightest halogen. It is exceptionally reactive as it reacts with all the other elements except for helium, argon, and neon, and is the most electronegative element.
Fluorine like halogens produces an anion with a charge of -1 to acquire stability. The symbol for this ion is F-, and the name given to the ion is fluoride ion. The atomic number of fluorine is 9, therefore, the number of electrons in this anion is 9+1 = 10.
Calculate the work when a cylinder equipped with a piston changes volume from 0.200 L to 0.600 L against an external pressure of 3.00 atm (Remember that 101.3 J = 1 L∙atm)
Answer:
[tex]-121.56\ \text{J}[/tex]
Explanation:
[tex]V_1[/tex] = Initial volume = 0.2 L
[tex]V_2[/tex] = Final volume = 0.6 L
P = Pressure = 3 atm
[tex]W=-P\Delta V\\\Rightarrow W=-3(V_2-V_1)\\\Rightarrow W=-3(0.6-0.2)\\\Rightarrow W=-1.2\ \text{L atm}[/tex]
[tex]1\ \text{L atm}=101.3\ \text{J}\\\Rightarrow -1.2\ \text{L atm}=-1.2\times 101.3\ \text{J}=-121.56\ \text{J}[/tex]
Work done is [tex]-121.56\ \text{J}[/tex].