Download The only sure evidence that a chemical reaction has occured is

TEST CHEMICAL REACTIONS 2011 Practice Questions
1. The only sure evidence that a chemical reaction has occurred is
2. CaCO3 represents a chemical _____.
3. A shorter, easier way to show chemical reactions, using symbols instead of words, is
called a _____.
4. The substances on the left of the arrow in a chemical equation are the substances you start
with called ______.
5. Give an example of a change that is NOT a chemical reaction?
6. How many atoms total are in the formula NaHCO3?
7. When chemical reactions occur
a.
chemical bonds break.
c.
new bonds form.
b.
atoms rearrange.
d.
All of the above
8. The substances formed from a chemical reaction are (the substances you end up with)
called ____.
Choose the balanced equation for each of the following:
9.
a.
b.
10.
a.
b.
H2 + O2 H2O
H2 + O2 H2O2
c.
H2 + O2 2H2O
d.
Al + HCl  AlCl3 + H2
Al + HCl  AlCl3 + H2 c.
2Al + 6HCl  2AlCl3 + 3H2
2H2 + O2 2H2O
H2 + 2O2 2H2O
Al + 3HCl  AlCl3 + 3H2
d.
Al + 3HCl  AlCl3 + H2
11. The law of conservation of matter states that matter cannot be created or destroyed means
that a chemical equation must show the same
12. A chemical reaction in which energy is absorbed or taken in is
13. Which reaction requires a continuous supply of energy in order to continue?
14.
15.
16.
17.
What is shown by A in Graph 1?
What is shown by B in Graph 1?
What type of reaction is shown in Graph 1?
Which graph illustrates the type of reaction that occurs when wood burns?
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
The minimum amount of energy needed for substances to react is called
A covalent bond in which electrons are shared unequally is
What happens when an acid reacts with a base?
____ is a compound that increases the number of hydrogen ions (H+) when dissolved in water.
Which of the following would taste sour?
When all the molecules of a compound break apart in water to make hydrogen ions (H+), you
have a ____.
When few molecules of a compound break apart in water to make hydrogen ions (H+), you have a
_____.
____ is a compound that increases the number of hydroxide ions (OH-) when dissolved in water.
A solution that has a pH of ____ is neutral.
Some plants, such as pine trees, prefer soil with a pH between 4 and 6. These plants prefer
Consider the following reaction:
HCl + NaOH  H2O + NaCl
28. Identify the acid in the reaction above.
29. Identify the base in the reaction above.
30. Identify the salt in the reaction above.