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