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Intro To Chemistry

Total questions: 61

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

What is a pure substance that cannot be broken down into any other substances by chemical or physical means (Ex. Oxygen)?

a)

Element

b)

Compound

c)

Mixture

d)

Molecule

2.

What is a pure substance made of 2 or more elements chemically combined in a specific ratio (Ex. Water)?

a)

Element

b)

Compound

c)

Mixture

d)

Solution

e)

Atom

3.
This picture represents: 
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
4.

The temperature at which a SOLID becomes a LIQUID.

a)

melting point

b)

freezing point

c)

viscosity

d)

solubility

5.

Properties that can be observed directly or measured without changing the chemical identity of the substance.

a)

chemical properties

b)

soluable properties

c)

density properties

d)

physical properties

6.

Which of the following is an example of a physical property?

a)

mass

b)

shape

c)

luster

d)

all of these are physical properties

7.

_______ are the smallest structure of living things.

a)

Atoms

b)

Molecules

c)

Cells

d)

Elements

8.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
9.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
10.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
11.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
12.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
13.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
14.
What part of the atom is the arrow pointing to?
a)
nucleus
b)
proton
c)
electron shell
d)
electron
15.
If the number of protons equal the number of _____, the atom will have no charge
a)
protons
b)
neutrons
c)
electrons
d)
nucleus
16.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
17.
An element is made up of only one kind of _____.
a)
isotope
b)
plastic
c)
atom
d)
metal
18.
What subatomic particles would you find in the nucleus of an atom?
a)
Protons only
b)
Protons and Neutrons
c)
Neutrons and Electrons
d)
Protons and Electrons 
19.
What subatomic particle(s) would be found orbiting the nucleus?
a)
Neutrons only
b)
Electrons only
c)
Protons and Neutrons
d)
Protons and Electrons
20.
What are the 3 subatomic particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
21.

Protons have a ____ charge.

a)

Positive

b)

Negative

c)

No charge

22.

Electrons have a ____ charge.

a)

Positive

b)

Negative

c)

No charge

23.

Neutrons have a ____ charge.

a)

Positive

b)

Negative

c)

No charge

24.

Which of the following in not a compound?

a)

H2O

b)

CO2

c)

NaCl

d)

H2

25.

An atom is much bigger than a cell.

a)

True

b)

False

26.

At atom is the smallest unit of matter.

a)

True

b)

False

27.

Elements get heavier as you go from the top to the bottom of the Periodic Table.

a)

True

b)

False

28.

How many hydrogen atoms are in a single methane molecule? CH4

a)

3

b)

4

c)

5

d)

6

e)

1

29.

How many protons does a single atom of Carbon have in it's center?

a)

1

b)

3

c)

5

d)

6

e)

12

30.

What element has an atomic number of 76?

a)

Titanium

b)

Osmium

c)

Mercury

d)

Gold

31.

When two or more atoms combine chemically we call that a?

a)

element

b)

solid

c)

molecule

d)

proton

32.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
33.

What are the three main states of matter?

a)

temperature

b)

solid

c)

liquid

d)

air

e)

gas

34.

This diagram represents...

a)

An element

b)

A molecule

c)

A compound

d)

A mixture of elements and compounds

35.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
36.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
37.

What is a compound?

a)

A molecule that is formed from two different elements/atoms.

b)

A molecule that is formed from two or more of the same element/atom.

c)

A tiny atom that makes up an atom.

d)

The center of an atom that is formed by neutrons. protons, and electrons.

38.

Which of the following cannot be broken down into something simpler?

a)

a compound

b)

an element

c)

a chemical formula

d)

a mixture

39.

If a compound has 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms, its chemical formula must be...

a)

12C22H11O

b)

  C12H22O11C_{12}H_{22}O_{11}  

c)

C11H22O12C_{11}H_{22}O_{12}  

d)

2C11H22O122C_{11}H_{22}O_{12}  

40.
What is the symbol of the element: gold?
a)
Ag
b)
As
c)
Ap
d)
Au
41.
What is the best formula for this molecule?
a)
C3H2
b)
C3H8
c)
CH
d)
CH8
42.

At what temperature does water Freeze?

a)

0o C

b)

100o C

c)

32o C

d)

-273o C

e)

-212o C

43.

At what temperature does water Freeze?

a)

0o F

b)

100o F

c)

32o F

d)

-273o F

e)

-212o F

44.

At what temperature does water boil?

a)

0o F

b)

100o F

c)

32o F

d)

-273o F

e)

212o F

45.

At what temperature does water Boil?

a)

0o C

b)

100o C

c)

32o C

d)

212o C

46.

The change of state from SOLID to LIQUID is called?

a)

Freezing

b)

Melting

c)

Evaporating

47.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

48.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
e)

4

49.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
50.

A force that holds two or more atoms by sharing electrons

a)

proton

b)

compound

c)

chemical bond

d)

element

51.

If graphite and diamonds are both made of only carbon atoms, why are they different substances?

a)

Their temperatures

b)

The arrangement of the atoms

c)

One is worth more money

d)

They are made of different elements

52.

The image to the left is a water molecule. The spheres in this image represent ___________.

a)
atoms
b)

molecules

c)

compounds

d)

cells

e)

chemical bonds

53.

The image to the left is a water molecule. The rods or lines in this image represent ___________.

a)
atoms
b)

molecules

c)

compounds

d)

cells

e)

chemical bonds

54.

What is a chemical formula?

a)

A group of chemical symbols and numbers that represent the elements and the number of atoms of each element in a compound.

b)

A list of all known elements.

c)

A description of a chemical reaction.

d)

A formula for calculating atomic mass.

55.

In the following lewis structure, how many bonds are around the central atom?

a)

1 bond

b)

2 bonds

c)

3 bonds

d)

4 bonds

56.

A student creates a ball-and-stick model of a substance. Which of the following BEST describes the model?

a)

one molecule with 4 atoms

b)

one atom with 4 molecules

c)

four molecules representing four atoms

d)

four elements representing one atom

57.

Ignore the question on the picture-- What is the chemical formula for ethene (choice B in picture)

a)

C2H4

b)

C2H6

c)

C2H6O

d)

C2H4

e)

CO2

58.

Ignore the question on the picture-- Which diagram has the most chemical bonds?

a)

A

b)

B

c)

C

d)

D

59.

Color is what type of property?

a)

Physical

b)

Chemical

60.

Reactivity is what type of property?

a)

Physical

b)

Chemical

61.

Plastics are made by polymerization which is

a)

heating molecules so they melt

b)

combining large molecules to make smaller molecules

c)

combining small repeating molecules to make a large molecule

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