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## Chemical Reactions

1.
The only sure evidence for a chemical reaction is
1. the formation of a gas
2. production of one or more new substances
3. color change
4. changes in properties
2.
Which of the following is an example of a chemical reaction?
1. salt crystals forming as sea water evaporates
2. ice melting in a glass of water
3. paper turning soft when wet
4. leaves changing colors in the fall
3.
When water is added to break apart a molecule, it is said that a                   reaction occurs
1. hydrolysis
2. dehydration
3. polymer-forming
4. none of the above
4.
Which statement is true about an exothermic reaction?
1. It releases energy.
2. It absorbs energy.
3. It requires no activation energy.
4. The energy of the products is greater than the energy of the reactants.
5.
A chemical reaction where energy is absorbed in the form of heat is called
1. synthetic
2. exothermic
3. combustion
4. endothermic
6.
The activation energy in a chemical reaction is
1. the energy needed to slow down a reaction.
2. the energy needed to change lipids into proteins.
3. the energy needed to get a reaction started.
4. the energy needed to stop a reaction.
7.
Which of the following equations represents a decomposition reaction?
1. $H_2O(g) -> 2H_2O(g) + O_2(g)$
2. $2Ag_2O(s)->4Ag(s)+O_2(g)$
3. $Ag(s)+NaCl(aq)->AgCl(s)+Na(s)$
4. $NH_3(g)+HCl(g)->NH_4Cl(s)$
8.
Which of the following chemical equations represents a combination reaction?
1. $H_2O(g) -> 2H_2O(g) + O_2(g)$
2. $2Ag_2O(s)->4Ag(s)+O_2(g)$
3. $Ag(s)+NaCl(aq)->AgCl(s)+Na(s)$
4. $NH_3(g)+HCl(g)->NH_4Cl(s)$
9.
Which of the following chemical equations represents a double displacement reaction?
1. $H_2O(g) -> 2H_2O(g) + O_2(g)$
2. $BaCl_2(aq)+K_2CrO_4(aq)->2BaCrO_4(aq)+2KCl(s)$
3. $Ag(s)+NaCl(aq)->AgCl(s)+Na(s)$
4. $NH_3(g)+HCl(g)->NH_4Cl(s)$
10.
Which of the following chemical equations represents a single displacement reaction?
1. $H_2O(g) -> 2H_2O(g) + O_2(g)$
2. $2Ag_2O(s)->4Ag(s)+O_2(g)$
3. $Ag(s)+NaCl(aq)->AgCl(s)+Na(s)$
4. $NH_3(g)+HCl(g)->NH_4Cl(s)$
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