Chemical reactions study guide chapter 12
neither a product nor reactant
A catalyst is which of the following?
Temperature
A change in _____ is a sign of energy being used in a chemical reaction.
True
A chemical reaction in which more energy is absorbed than released is endothermic. True or false?
absorbs energy from the surroundings
Breaking a chemical bond _____.
Double-replacement
Sodium fluoride and silver nitrate become sodium nitrate and silver chloride. Carbonate and hydrogen ions become water and carbon dioxide. This is a _____ reaction.
The two weights will be equal, because the mass is the same.
Some baking soda and vinegar were weighed separately and the weights added together. The two substances are mixed and a chemical reaction occurred, producing carbon dioxide, sodium acetate, and water. When the three new substances are weighed and the weights totaled, which of the following will be true?
inhibitor
A(n) _____ slows or stops a chemical reaction.
The masses are always equal
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
False
According to the law of conservation of mass, three atoms of calcium can react to produce six atoms of calcium. True or false?
True
Activation energy is the minimum amount of energy needed for a chemical reaction to begin. True or false?
False
All chemical reactions occur at the same rate. True or false?
have a fixed arrangement of atoms
All substances _____.
releases thermal energy
An exothermic reaction _____.
chemical bonds break and particles collide with enough energy
Atoms rearrange when _____.
False
Catalysts are always enzymes. True or false?
False
Chemical equations are balanced by changing the subscripts of the molecules. True or false?
can either release more energy than they absorb or absorb more energy than they release, depending on the reaction
Chemical reactions ______.
product
Each substance written to the right of the arrow in a chemical equation is a ____.
absorb more energy than they release
Endothermic reactions _______________.
A chemical reaction has occurred.
If the arrangement of atoms in a substance changes, then which of the following is true?
True
Energy is needed to break bonds in chemical reactions. True or false?
False
Exothermic reactions do not require any activation energy. True or false?
releases energy into the surroundings
Forming a chemical bond ___________
decomposition
Metallic chlorates, when heated, results in metallic chlorides and oxygen. This is a _____ reaction.
synthesis
Sulfur trioxide reacts with water to make sulfuric acid. This is a _____ reaction.
True
When a chemical equation contains the same number of atoms on both sides, the equation is balanced. True or false?
3
Which figure models a decomposition reaction?
2
Which figure models a synthesis reaction?
Wood is burned
Which of the following changes is chemical rather than physical?
bubbles in boiling water
Which of the following is NOT a result of a chemical reaction?
change in chemical properties
Which of the following is certain proof a chemical reaction has occurred?
All atoms at the start of a chemical reaction are present at the end of the reaction.
Why is the law of conservation of mass true?
1
which figure models a double replacement reaction?
4
which figure models a single replacement reaction?
making the reactant particles larger
which one of the following factors would not speed up a chemical reaction?