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WorksheetsChemical reactions
Total questions: 67
Worksheet time: 44mins
Name
Class
Date
1.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
2.
In an endothermic reaction, heat is ,,,
a)
taken in
b)
given out
3.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
4.
Which is a physical change?
a)
burning match
b)
vinegar in baking soda
c)
melting butter
d)
cooking an egg
5.
Which of the following is a chemical property of water?
a)
Reacts with pure sodium.
b)
Boils at 100 oC.
c)
Dissolves sugar easily.
d)
Has a density of 1 gm/mL
6.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
7.
What characteristic defines all chemical changes?
a)
There is a change of state.
b)
Electricity is produced.
c)
A new material is formed.
d)
Bubbles are produced.
8.
Green bananas turning yellow on their own as they ripen.
a)
Chemical Change
b)
Physical Change
9.
An instant ice pack getting cold when the chemicals are able to touch.
a)
Chemical Change
b)
Physical Change
10.
What is an example of a Chemical change?
a)
Ripped paper
b)
boiled egg
c)
cracked egg
d)
sugar in water
11.
sodium and potassium react violently with water
a)
physical change
b)
chemical change
12.
tire inflated with air
a)
physical change
b)
chemical change
13.
Alka-Seltzer gives off carbon dioxide when added to water
a)
physical change
b)
chemical change
14.
a piece of copper is cut in half
a)
physical change
b)
chemical change
15.
a sugar cube is ground up
a)
physical change
b)
chemical change
16.
iron pipe rusts
a)
physical change
b)
chemical change
17.
rubbing alcohol evaporates
a)
physical change
b)
chemical change
18.
milk sours (goes bad)
a)
physical change
b)
chemical change
19.
paper burns
a)
physical change
b)
chemical change
20.
Chemical reactions that release energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Reactions
21.
Chemical reactions that absorb energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Explosive
22.
hydrochloric acid reacts with magnesium to produce hydrogen gass
a)
physical change
b)
chemical change
23.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
24.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
25.
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
a)
8 g/cm3
b)
2 g/cm3
c)
1/2 g/cm3
d)
24 g/cm3
26.
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
a)
3 g/cm3
b)
1/3 g/cm3
c)
27 g/cm3
d)
39 g/cm3
27.
Calculate the density of the cube.
a)
2 g/cm3
b)
4 g/cm3
c)
6 g/cm3
d)
8 g/cm3
28.
A block has a mass of 54g and a volume of 20cm3. What is the density of the block?
a)
74 g/cm3
b)
1080 g/cm3
c)
34 g/cm3
d)
2.7 g/cm3
29.
Veal finds a gold colored rock in a river. It has a mass of 9.65 grams and a volume of 0.5 cm3. What is the density of the rock?
a)
10.15 g/cm3
b)
19.3 g/cm3
c)
9.15 g/cm3
d)
4.825 g/cm3
30.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
31.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
32.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
33.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
34.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
35.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
36.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
37.
Is mixing lemonade powder with water a physical or chemical change?
a)
physical
b)
chemical
38.
Is bleaching your hair a physical or chemical change?
a)
physical
b)
chemical
39.
Are fireworks exploding a physical or chemical change?
a)
phyiscal
b)
chemical
40.
Is sqeezing organges to make orange juice a phyical or chemcial change?
a)
physical
b)
chemical
41.
Is frying an egg a physical or chemical change?
a)
chemical
b)
physical
42.
Is burning leaves a physical or chemical change?
a)
chemical
b)
physical
43.
Is making salt water to gargle with a physical or chemical change?
a)
physical
b)
chemical
44.
Is cream being whipped a physical or chemical change?
a)
physical
b)
chemical
45.
Is melting ice cream a phyiscal or chemical change?
a)
physical
b)
chemical
46.
Is moldy cheese a chemical or physical change?
a)
chemical
b)
physical
47.
Is spoiled meat a chemical or physical change?
a)
chemical
b)
physical
48.
Is rancid butter a chemical or physical change?
a)
physical
b)
chemical
49.
Is moldy cheese a chemical or physical change?
a)
chemical
b)
physical
50.
Is spoiled meat a chemical or physical change?
a)
chemical
b)
physical
51.
Using dye to change the color of a shirt green.
a)
Chemical Change
b)
Physical Change
52.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
53.
Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven.
a)
Chemical Change
b)
Physical Change
54.
The smell your dog makes after eating to much people food.
a)
Chemical Change
b)
Physical Change
55.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
56.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
57.
Acids have a pH below 7.
a)
True
b)
False
58.
Bases have a pH above 7.
a)
False
b)
True
59.
Which of these pH values would indicate that a solution is a weak base?
a)
4
b)
5.6
c)
8
d)
13
60.
What is the pH of a neutral substance?
a)
0
b)
5
c)
7
d)
10
61.
Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution. If you test a base with litmus paper, it will turn ____________.
a)
purple
b)
red
c)
blue
d)
pink
62.
What does a pH of 1 indicate about a liquid?
a)
it is a very strong base
b)
it is a weak base
c)
it is a weak acid
d)
it is a strong acid
63.
Williams collected a rain sample and measured its pH to be 5.6. What does this mean?
a)
the rain water is a weak base
b)
the rain water is neutral
c)
the rain water is a strong acid
d)
the rain water is a weak acid
64.
Ranging from 0 to 14, a pH value indicates how acidic or basic a solution is. Which of these pH values would be a strong acid?
a)
2
b)
6
c)
9
d)
13
65.
The pH of vinegar is 2.5. Vinegar is a _____________.
a)
strong acid
b)
strong base
c)
weak base
d)
weak acid
66.
Which of these solutions is an acid?
a)
Dish Soap: pH of 12
b)
Tomato Soup: pH of 4
c)
Baking Soda: pH of 9
d)
Drain Cleaner: pH of 14
67.
Ammonia has a pH of 12. Ammonia is __________.
a)
an acid
b)
a base
c)
an element
d)
a metal
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