chemistry final
For the reaction represented by the equation 2Na + 2NaCL. how many grams of sodium chloride can be produced from 500.g each of sodium and chlorine?
.824g
How many moles of magnesium is 3.01 x 10^22 atoms?
0.05
How many oxygen atoms are in 20g of CaCO3?
1.203 x 10^23
What is the mass in grams of 3.01 x 10^24 atoms of sodium?
114.95g
How many grams are there in 9.40 x 10^25 molecules of H2?
156
What is the molar mass of Fe2O3?
159.70g
How much does 1 mol of oxygen gas weigh?
16.00g
In the reaction represented by the equation N2 + 2O2 = 2NO2, what is the volume ratio of N2 to NO2?
1:2
Which of the below coefficient choices best represents this as a balanced equation?
2, 1, 2, 1
Which of the below coefficient choices best represents the following as a balanced equation? AlBr3 + K2SO4 = KBr + Al2(SO4)3
2AlBr3 + 3K2SO4 = 6KBr + Al2(SO4)3
Which of the below coefficient choices best represents the following as a balanced equation? NaCl = Na + Cl2
2NaCl = 2Na + Cl2
What is the molar mass of Ca3(PO4)2?
310.18g
In the equation 2KClO3 = 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol KClO3 of decompose completely?
4.5 mol
Which of the below coefficient choices best represents following as a balanced equation? AgI + Fe2(CO3)3 = FeI3 + Ag2CO3
6AgI + Fe2(CO3)3 = 2FeI3 + 3Ag2CO3
How much does 1 mol of chlorine gas weigh?
70.9g
What is the molar mass of Ca(OH)2?
74.1g
How many moles are there in 20.g of potassium?
782
What is the molar mass of H2SO4?
98g
At which point will the girl on the swing have the most potential energy?
A
What type of reaction is represented?
Double replacement
What is metal often used for cooking pans?
Good conductor
How does a catalyst work?
It lowers the activation energy of the reaction
An exothermic reaction
Releases heat energy to surroundings
What type of reaction is 2NaCl + F2 = 2NaF + Cl2?
Single replacement
Which of the below coefficient choices best represents the following as a balanced equation? C2H4O2 + O2 = CO2 +H2O
C2H4O2 + 2O2 = 2CO2 + 2H2O
If one knows the mole ratio of a reactant and product in a chemical reaction, one can
Calculate the mass of the product produced from a known mass of a reactant
What type of reaction is 2KClO3 = 2KCl + 3O2?
Decomposition
Which of the following choices represents the reactants in the above equation?
A,B
What energy transformation occurs when gasoline burns in an automobile?
Chemical, mechanical, thermal
What type of reaction is C2H5OH + 3O2 = 3H2O + 2CO2?
Combustion
Which of the following choices represent the products in the above equation?
E,F
Describe the energy transfer.
Electromagnetic/Radiation to chemical
The sun provides _________ energy to plants. Plants convert this energy to ________ energy.
Electromagnetic/radiation, chemical
You mix two reactants in a beaker. The substance inside the beaker shows a marked increase in temperature and the beaker feels cooler. What type of reaction is occuring?
Endothermic
Temperature is indicative of the amount of what type of energy?
Kinetic energy
The energy of an object or substance in motion is called
Kinetic energy
__________ says that energy is not created or destroyed.
Law of conservation of mass
Predict what happens when nickel is added to a solution of potassium chloride.
No reaction occurs
Does the above equation comply with the law of conservation of mass? Why or why not?
No, the amount of reactants and products on both side are equal. This equation would not to be balanced.
The sun heats the Earth through the process of _______.
Radiation
What is the name of the energy that has stored energy due to position, shape, or chemical makeup?
Potential Energy
Stored energy in an object or substance that is not being used yet is called
Potential energy
An endothermic reaction
Pulls in heat energy from the surroundings
