Chemistry
What is the Law of Conservation of Mass?
Matter cannot be created or destroyed but it can change form
Why do atoms form bonds?
It takes less energy
In the following chemical equation, what should the coefficient should be in front of the water molecule?
CH4 + 2 O2 -----> CO2 + ______ H2O
2
What happens to energy during an exothermic reaction?
It is released
Which of the four factors affects the rate of reaction by making particles collide more frequently because there are MORE of them?
Concentration
After a chemical reaction will the properties of the products still be the same as the reactants? Give an example.
No
Na and Cl ----> salt
Where is energy stored in a chemical reaction?
in the bonds
What are the reactants in the following chemical reaction?
Mn + HI -----> H2 + MnI3
Mn and HI
What happens to energy during endothermic reactions?
It is absorbed
Which of the four factors increases the rate of a reaction by making the particles move faster?
Temperature
In a chemical equation what do we call the substances on the left side of the arrow?
reactants
According the Law of Conservation of Energy, if 1000 kj of energy is used in the reactants, how much energy will be released with the products?
1000 kj
What do we call the number in front of a molecule?
Coefficient
Which type of reaction gets hotter?
Exothermic
What do we call the smallest amount of energy required to make a reaction occur?
Activation Energy
In a chemical equation what do we call the substances on the right side of the arrow?
products
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed but it can change forms
Is the following equation balanced?
CaCO3 ----> CO2 + CaO
Yes
Which type of reaction gets colder?
Endothermic
What is collision theory?
atoms must collide with enough energy
What is chemistry?
study of matter and how it changes
Balance the equation.
N2H4O4 -----> N2 + O2 + H2O
N2H4O4 -----> N2 + O2 + 2 H2O
Balance the equation.
Mn + HI -----> H2 + MnI2
Mn + 2 HI ----> H2 + MnI2
What type of reaction was the baking soda and vinegar?
Endothermic
What do we call a substance that speeds up the rate of a chemical reaction?
Catalyst