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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
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. $3KCl + Al rarr AlCl_3 + 3K$
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 $2Al + 6HCl rarr 3H_2 + 2AlCl_3$?
1. synthesis
2. decomposition
3. single replacement
4. double replacement
When hydrogen and oxygen combine to form water, water is
1. a product.
2. a reactant.
3. both a product and reactant.
4. neither a product nor a reactant.
The burning of methane is an example of a(n)
1. catabolic reaction.
2. biochemical reaction.
3. anabolic reaction.
4. exothermic reaction.
What is the term used to describe the energy needed to get a reaction started?
2. activation energy
3. cohesion energy
4. chemical energy