Balancing Chemical Equations — Unit test Answers
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Which clue can be used to identify a chemical reaction as a decomposition reaction?
A
The reaction involves oxygen.B
The reaction involves ions.C
The reaction has a single reactant.D
The reaction has a single product.22
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Which balances the equation Mg + O2 → MgO?
A
Mg + 2O2 → 4MgOB
2Mg + 2O2 → 2MgOC
2Mg + O2 → 2MgOD
2Mg + 2O2 → 4MgO23
There are several different models that represent compounds. One type of model is shown.
A
a structural formulaB
a chemical formulaC
a space-filling modelD
a ball-and-stick model24
When looking at the chemical symbol, the charge of the ion is displayed as the
A
superscript.B
subscript.C
coefficient.D
product.25
Calcium has a charge of +2. The chart lists the charges of different ions.
A
CaO, CaMg, or CaF2B
Ca2Cl, CaNa, or CaPC
CaF, CaMg, or CaNaD
CaO, CaF2, or CaCl2Did you find these answers helpful?
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