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Worksheets

8.p.1 and 8.p.2

Total questions: 43

Worksheet time: 24mins

Name
Class
Date
1.

When two or more types of atoms are combined chemically, they make what?

a)

Mixture

b)

Compound

c)

Solution

d)

Vapor

2.
When two or more different substances are physically combined, they form what?
a)
Compound
b)
Mixture
c)
Solution
d)
Vapor
3.

An element is identified by

a)

its number of protons.

b)

the atomic mass.

c)

the type of charge.

d)

its number of isotopes.

4.

The number of protons and neutrons in the atom is its

a)

atomic mass.

b)

atomic number.

c)

atomic power.

d)

atomic clock.

5.

The element sodium appears like this in the periodic table. Which is its chemical symbol?

a)

11

b)

Na

c)

sodium

d)

22.990

6.

The chemical formula for baking soda is NaHCO3. How many different elements make up baking soda?

a)

1

b)

2

c)

3

d)

4

7.

How are elements ordered in the modern periodic table?

a)

by date of discovery

b)

by decreasing atomic mass

c)

by increasing atomic number

d)

by alphabetical order of element symbols

8.

How many periods does the periodic table contain?

a)

7

b)

8

c)

9

d)

10

9.

What are the columns of the periodic table called?

a)

periods

b)

rows

c)

tables

d)

groups or families

10.

Properties such as magnetism, luster, and malleability have been used to group together which category of elements on the periodic table?

a)

metals

b)

nonmetals

c)

metaloids

d)

noble gases

11.

If a highly-reactive metal with one valence electron is discovered, in which group would the element best fit?

a)

group 1

b)

group 2

c)

group 17

d)

group 18

12.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
13.
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
14.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
15.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
16.

A chemical reaction occurs in a sealed test tube. As the results of the reaction 24 grams of product are produced. Which is most likely true?

a)

The mass of the reactants was 24 grams

b)

The mass of the reactants was less than 24 grams

c)

The mass of the reactants was more than 24 grams

17.
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
a)
12 atoms of carbon (C)
b)
6 atoms of carbon (C)
c)
3 atoms of carbon (C)
d)
2 atoms of carbon (C)
18.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
19.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
20.
Which one is a compound?
a)
Co
b)
Br
c)
Fe
d)
CO
21.

C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2  
Given this chemical equation, what are the REACTANTS?

a)

C2H6 and 5O2C_2H_{6\ }and\ 5O_2  

b)

2CO2 and 3H2O22CO_2\ and\ 3H_2O_2  

22.

Which best represents a compound?

a)
b)
c)
d)
23.

What happens to water molecules during the boiling process?

a)

They move faster and move farther apart as they absorb heat.

b)

They move faster and remain close together as they absorb heat.

c)

They move more slowly but move farther apart as they lose heat.

d)

They move faster and move farther apart as they lose heat.

24.

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

a)

During a chemical reaction, the total amount of matter stays the same.

b)

During a chemical reaction, matter is destroyed.

c)

During a chemical reaction, one or more new substances are formed.

d)

During a chemical reaction, the total number of atoms increases.

25.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

26.
Natural resources that are replenished by the environment in a short period of time (wind, solar power, geothermal energy, etc)
a)
Nonrenewable resources
b)
Renewable resources
c)
Solar Energy
d)
Fossil Fuels
27.
Resources that are not easily replenished by the environment.
a)
Renewable resources
b)
Nonrenewable resources
c)
Geothermal energy
d)
Energy conservation
28.
Nonrenewable resource; natural fuel such as coal, gas or natural gas that is formed in the Earth from the remains of living organisms.
a)
Biomass
b)
Hydroelectric power
c)
Solar energy
d)
Fossil fuels
29.
Renewable resource; form of energy generated by the conversion of free-falling dam water to electricity 
a)
hydroelectric power
b)
biomass
c)
solar energy
d)
biofuels
30.
Renewable resource; Total mass of organisms in a given area or volume that can be used as a fuel.
a)
hydroelectric power
b)
geothermal energy
c)
fossil fuels
d)
biomass
31.
One problem with ____ energy is that it produces radioactive waste. 
a)
nuclear
b)
solar
c)
tidal
d)
wind
32.
Fossil fuels are considered nonrenewable resources because of - 
a)
Where they come from
b)
How they are produced 
c)
How useful they are 
d)
How long they take to form 
33.

Which is an example of a physical change?

a)

boiling

b)

burning

c)

rotting

d)

rusting

34.

What characteristic of aluminum allows it to be made into aluminum foil?

a)

It is dense.

b)

It is soluble.

c)

It is magnetic.

d)

It is malleable.

35.

Which substance is composed of more than one element?

a)

water

b)

carbon

c)

gold

d)

sodium

36.
In a heterogeneous mixtures, particles are easily seen.
a)
True
b)
False
37.

Which are most responsible for creating acid rain pollution?

a)

nuclear power plants

b)

coal-burning power plants

c)

hydroelectric power plants

d)

wood-burning power plants

38.
Which is a problem with using wind turbines to produce energy?
a)
Wind turbines are efficient only in certain areas.
b)
 Wind turbines occupy a small area of land.
c)
Wind turbines produce a large amount of energy.
d)
 Wind turbines create a large amount of pollution.
39.

Which would least likely have an impact on global climate changes?

a)

producing energy using hydroelectric plants

b)

producing energy using coal

c)

producing energy using oil

d)

producing energy using natural gas

40.

organic matter that can be used as an energy source. (ex: wood, crops, and animal waste)

a)

hydrothermal

b)

geothermal

c)

wasteish

d)

biomass

41.

heat energy from within the earth.

a)

wind energy

b)

energy sources

c)

geothermal energy

d)

hydrothermal energy

42.
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
43.
Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
a)
A physical change occurred.
b)
Atoms involved in the reaction lost mass.
c)
Precipitates were created in the new solution.
d)
Gases were released to the atmosphere.

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