Physical Science Review 6.2: Question Preview (ID: 15647)

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To balance chemical equations _________________ are used
a) coefficients
b) subscripts
c) moles
d) symbols

Which chemical equation is balanced
a) Ca(OH)2 + CO2 → CaCO3 + H2O
b) Cu + S → Cu2S
c) N2 + O2 → NO2
d) CaBr2 + Na2CO3 → CaCO3 + NaBr

In a double replacement reaction hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is
a) water
b) hydrogen gas
c) hydroxide
d) sodium hydride

Zn + 2HCl → H2 + Zn + 2Cl is an example of ____________ equation
a) decomposition
b) synthesis
c) single replacement
d) double replacement

H2O + CO2 → H2CO3 is an example of a _______________ reaction
a) synthesis
b) decomposition
c) single replacement
d) double replacement

In chemical reactions, what is the relationship between the total mass of reactants and the total mass of products?
a) they are the same
b) total mass of reactants is greater
c) total mass of products is greater
d) there is no relationship

How many atoms of copper (Cu) are represented in 2 Cu2O
a) 4
b) 3
c) 2
d) 1

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) water
d) oxygen

A substance that appears at the end of a chemical reaction is a
a) product
b) reactant
c) mole
d) coefficient

A substance that enters into a chemical reaction is called a
a) reactant
b) product
c) mole
d) coefficient

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