Physical Science Review 6.2 Question Preview (ID: 15647)


Describing Chemical Reactions. TEACHERS: click here for quick copy question ID numbers.

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

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

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

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

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

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

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

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

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

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