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Physical Science Review 6.2
Test Description: Describing Chemical Reactions
Instructions: Answer all questions to get your test result.
1) A substance that enters into a chemical reaction is called a
A
coefficient
B
product
C
reactant
D
mole
2) A substance that appears at the end of a chemical reaction is a
A
reactant
B
product
C
mole
D
coefficient
3) In a reaction where hydrogen peroxide breaks down into water and oxygen gas, which substance(s) are the reactants?
A
water and oxygen
B
hydrogen peroxide
C
water
D
oxygen
4) How many atoms of copper (Cu) are represented in 2 Cu2O
A
4
B
3
C
2
D
1
5) In chemical reactions, what is the relationship between the total mass of reactants and the total mass of products?
A
total mass of reactants is greater
B
total mass of products is greater
C
there is no relationship
D
they are the same
6) H2O + CO2 → H2CO3 is an example of a _______________ reaction
A
single replacement
B
double replacement
C
decomposition
D
synthesis
7) Zn + 2HCl → H2 + Zn + 2Cl is an example of ____________ equation
A
decomposition
B
single replacement
C
double replacement
D
synthesis
8) In a double replacement reaction hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is
A
hydrogen gas
B
water
C
sodium hydride
D
hydroxide
9) To balance chemical equations _________________ are used
A
coefficients
B
symbols
C
subscripts
D
moles
10) Which chemical equation is balanced
A
Ca(OH)2 + CO2 → CaCO3 + H2O
B
N2 + O2 → NO2
C
Cu + S → Cu2S
D
CaBr2 + Na2CO3 → CaCO3 + NaBr
*select an answer for all questions
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