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# Reactions Questions - All Grades

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To balance a chemical equation, you may adjust the
1. coefficients.
2. subscripts.
3. formulas of the product.
4. either of coefficients or subscripts.
What happens to matter during a chemical reaction?
1. some matter is destroyed
2. matter is neither destroyed or created
3. some matter is created
4. some matter is destroyed and some is created
A chemical equation that shows the same number of each kind of atom is considered to be
1. balanced.
2. unbalanced.
3. an incomplete reaction.
4. a replacement reaction.
What is the Greek prefix for the number 4?
1. tetra-
2. hepta-
3. hexa-
4. deca-
Which is the balance equation for the following reaction?

$KCl + Al rarr AlCl_3 + K$
1. $KCl + Al rarr AlCl_3 + 3K$
2. $3KCl + Al rarr 3AlCl_3 + K$
3. $KCl + Al rarr 3AlCl_3 + 3K$
4. $3KCl + Al rarr AlCl_3 + 3K$
A substance that undergoes a change in a chemical reaction is
1. a substance.
2. a reactant.
3. an enzyme.
4. a chemical.
What type of chemical reaction is $P + O -> PO$?
1. synthesis
2. decomposition
3. single replacement
4. double replacement
What type of reaction does the following equation represent?

$FeS + 2HCl rarr FeCl_2 + H_2S$
1. synthesis reaction
2. double-displacement reaction
3. single-displacement reaction
4. decomposition reaction
Which of the following is true for all chemical reactions?
1. The total mass of the reactants increases.
2. The total mass of the products is greater than the total mass of the reactants
3. The total mass of the reactants equals the total mass of the products.
4. The total mass of the products is less than the total mass of the reactants.
What type of reaction is $2Al + 6HCl rarr 3H_2 + 2AlCl_3$?