WorksheetsCompounds and Chemical Changes
Total questions: 41
Worksheet time: 55mins
Name
Class
Date
1.
Water compound
a)
NaCl
b)
H2O
c)
Protein
d)
CaCO
2.
Is salt (NaCI) a compound or a element
a)
Compound
b)
element
3.
Which is a chemical change?
a)
freezing fruit juice
b)
slicing a potato
c)
boiling water
d)
copper metal turning green
4.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
5.
What are the reactants in the following chemical equation?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
H2
b)
O2
c)
2H2 + O2
d)
2H2O
6.
What are the products in the following chemical equation?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
H2
b)
O2
c)
2H2 + O2
d)
2H2O
7.
The Law of Conservation of Mass states that ALL matter....
a)
can be created and destroyed
b)
cannot be created nor destroyed but can change form
c)
cannot be created nor destroyed but can be transfered
d)
can be created but not destroyed
8.
How many ELEMENTS are in the compound H2O
a)
1
b)
2
c)
3
d)
4
9.
How many ELEMENTS are in the compound O2
a)
1
b)
2
c)
3
d)
4
10.
What is a chemical equation?
a)
A short way to show a chemical reaction using symbols
b)
A way to explain a chemical reaction using words
11.
What is the part of the chemical equation in green called?
Fe + S --> FeS
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
12.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
13.
What is the right part of a chemical equation called...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
14.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
15.
Is this balanced?...
Fe + S --> FeS
Fe + S --> FeS
a)
YES!
b)
NO!
16.
What is the chemical formula for Water?
a)
CO2
b)
HO
c)
2HO
d)
H2O
17.
A change in matter that forms one or more new substances is a...
a)
color change
b)
chemical change
c)
physical change
d)
substance change
18.
A one letter or two letter set of characters used to identify an element is a....
a)
diagram
b)
chemistry
c)
note
d)
symbol
19.
Which of the following is evidence of a chemical reaction
a)
changes in properties
b)
color change
c)
gas production
d)
ALL OF THE ABOVE
20.
What indicates a chemical reaction occurred?
a)
Heat or Light is released
heat or light is produced
heat or light is produced
b)
gas (bubbles) produced
c)
color change
d)
all of the above
21.
A candle wick burning is an example of a _________________________
a)
physical reaction
b)
condensation
c)
neutrons
d)
chemical reaction
22.
_______________ is an example of both a color change and new substance produced from a chemical change with oxygen and metal.
a)
shredded paper
b)
rust (iron oxide)
c)
wood chips
d)
melted wax
23.
_____________________ is a chemical reaction in plants to produce glucose (sugar).
a)
Photosynthesis
b)
Decomposition
c)
Foliage
d)
Respiration
24.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
25.
Which of these is NOT a sign that a chemical change has occurred?
a)
Change in shape.
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
26.
The ___________ states that in an equation, the mass of the reactants must equal the mass of the products.
a)
Law of Science
b)
Law of Equation
c)
Law of Lavoisier
d)
Law of Conservation of Mass
27.
Which one of the following is a precipitate?
a)
A solid that forms from solution during a chemical reaction
b)
A liquid that forms from solution during a chemical reaction
28.
When you combined vinegar and baking soda, which type of reaction did you witness?
a)
Physical Change
b)
Chemical Change
29.
Which example shows a new substance being formed?
a)
a candle burning
b)
a shoelace being tied
c)
a pipe being cut in half
a pipe being cut in half
d)
a block of ice melting
30.
Which is a chemical change?
a)
Frying an egg
b)
Boiling water
c)
Breaking a glass cup
d)
Crushing a piece of bread
31.
Law of conservation of mass states that
a)
matter is created
b)
matter is destroyed
c)
matter is neither created nor destroyed
d)
matter does not change
32.
iron pipe rusts
a)
physical change
b)
chemical change
33.
water is heated and changed to steam
a)
physical change
b)
chemical change
34.
Salt water is:
a)
A Compound
b)
An element
c)
A mixture
d)
An atom
35.
The following is a:
a)
Compound
b)
Element
c)
Mixture of elements
d)
Diatomic molecule
36.
This is an example of a:
a)
Compound
b)
Element
c)
Diatomic molecule
d)
Mixture of compounds
37.
What is gold (Au)?
a)
element
b)
compound
c)
mixture
38.
What is water (H20)?
a)
element
b)
compound
c)
mixture
39.
What is sugar (C6H12O6)?
a)
element
b)
compound
c)
mixture
40.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
41.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
100 %
