Q1
Classify this reaction:
The temperature of two separate solutions is found to be 20 degrees C. When the solutions are mixed, a precipitate
forms and the temperature changes to 18 degrees C.
A Endothermic Reaction
B Exothermic Reaction
Q2
Which kind of reaction needs energy to continue?
A Endothermic Reaction
B Exothermic reaction
Q3
What would happen if the activation energy for a particular chemical reaction was not available?
A The reaction would occur faster.
B The reaction would occur slower.
C The reaction would not occur.
D The reaction would begin sooner.
Q4
A chemical equation that shows the same number of each kind of atom is considered to be
A balanced
B unbalanced
C an incomplete reaction
D a replacement reaction
Q5
What is an exothermic reaction?
A a reaction where energy is absorbed
B a reaction where energy is released
C a reaction where energy is multiplied
D a reaction where energy is divided
Q6
What is an endothermic reaction?
A A reaction where energy is absorbed.
B A reaction where energy is released.
C A reaction where the energy is not changed.
D A reaction where the energy is multiplied.
Q7
What is the process by which one element changes into another element?
A half-life
B chemical reaction
C chain reaction
D transmutation
Q8
What is one element that replaces another element in a compound?
A single- displacement reaction
B chemical reaction
C chain reaction
D transmutation
.
Q9
Define chemical reaction.
A A process that produces a chemical change.
B A process where energy is released
C A process where energy is produced
D A process that produces a physical change
Q10
CaCO3 represents a chemical
A symbol
B subscript
C formula
D reaction
.
Q11
A reaction in which one element is substituted for another in a compound is called a(n)
A exothermic
B decomposition
C synthesis
D replacement
reaction.
Q12
Which of the following is a chemical reaction?
A making ice cubes
B baking a cake
C slicing a carrot
D boiling water
Q13
A compost pile releases heat due to chemical reactions involving nitrogen. These chemical reactions are
A endothermic
B exothermic
C organic
D decomposition
.
Q14
There are no factors that affect rates of reaction.
A True
B False
Q15
A reaction in which ions from two compounds exchange places is called a
A balanced
B double displacement
C an incomplete
D a replacement
reaction.
Q16
When energy is taken in during a chemical reaction, we would describe that chemical reaction as being
A exothermic
B electromagnetic
C endothermic
D weight
.
Q17 Define an inhibitor.
A substance that prevents or slows down a chemical reaction
B substance that allows or fasten up a chemical reaction
Q18
A change in matter that produces a new substance(s) is called
A chemical reaction
B physical change
C mixture
D solution
.
Q19
A
is any change that involves the formation of a new substance, which often includes products and
reactants.
A Celsius
B Characteristic property
C Chemical reaction
D Condensation
Q20
Which of the following will not increase the rate of a reaction?
A adding a catalyst
B increasing the temperature of a reaction
C decreasing the concentration of reactants
D grinding the solid into powder
Q21
In an exothermic reaction, energy is transferred from
A the reactants to the surroundings.
B the surroundings to the reactants.
C One reactant to another.
D the container it was in.
Q22
A substance that undergoes a change in a chemical reaction is
A a substance.
B a reactant.
C an enzyme.
D a chemical.
Q23
What does a neutralization reaction produce?
A Acids
B Bases
C Water and a salt
D Carbonated water
Q24
Which of the following is an example of a chemical reaction?
A salt crystals forming as sea water evaporates
B ice melting in a glass of water
C paper turning soft when wet
D leaves changing colors in the fall
Q25
The only sure evidence for a chemical reaction is
A the formation of a gas.
B production of one or more new substances.
C color change.
D changes in properties.
Q26
The total of all chemical reactions in an organism is
A metabolism.
B digestion.
C endocytosis.
D exocytosis.
Q27
In a synthesis reaction, what happens to a compound?
A Breakdown of an element into two new elements.
B A compound gets decomposed.
C A compound burns gas.
D A new more complex compound is formed.
Q28
A reaction between an acid and a base is called
A catalyzation
B nitrification
C neutralization
D polymerization
.
Q29
Which is NOT evidence that a chemical reaction has occurred?
A Milk tastes sour.
B Steam condenses on a cold window.
C A strong odor comes from a broken egg.
D A slice of raw potato darkens.
Q30
What happens to the old molecules in a chemical reaction?
A They rearrange into new molecules.
B They stay the same.
C They are destroyed.
D They create new molecules to attach to.
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