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Chemistry in Biology

Total questions: 68

Worksheet time: 3570secs

Name
Class
Date
1.

Which defines an atom?

a)

Building Block of energy

b)

Building Block of matter

c)

charged particle

d)

smallest particle

2.

The smallest piece of an element:

a)

quark

b)

electron

c)

shell

d)

atom

3.

Protons and neutrons are found in the center of the atom called the:

a)

nucleus

b)

neutron

c)

shell

d)

cell

4.

Classification system for elements is called:

a)

Elements

b)

Periods

c)

The Periodic Table of Elements

d)

Families

5.

The subatomic particles are called:

a)

protons, nucleus and electrons

b)

protons, electrons and neutrons

c)

protons, positives and negatives

d)

cloud, shell and quarks

6.

Substances that have only one kind of atom are called:

a)

elements

b)

nitrogen

c)

electrons

d)

nucleus

7.

Electrons have a _____ charge.

a)

neutral

b)

negative

c)

positive

d)

both positive and negative

8.

The abbreviation for an element:

a)

element name

b)

atomic number

c)

chemical symbol

d)

atomic symbol

9.

What is the sum of an atom's protons and neutrons called?

a)

atom

b)

atomic theory

c)

atomic mass

d)

atomic number

10.

The _____ is based on the number of protons in the nucleus of the atom.

a)

atomic structure

b)

periodic table of the elements

c)

atomic number

d)

atomic mass

11.

What subatomic particle is represented by this symbol (+):

a)

neutron

b)

proton

c)

electron

12.

What subatomic particle is represented by this charge (-):

a)

neutron

b)

proton

c)

electron

13.

Why do the electrons surround the nucleus?

a)

the negative electrons are attracted to the neutral neutrons

b)

the negative electrons are repelled by the neutral neutrons

c)

the negative electrons are attracted to the positive protons

d)

the negative electrons are repelled by the positive protons

14.

All matter is made of _____.

a)

light

b)

energy

c)

cells

d)

atoms

15.

Formed when two or more elements are joined chemically

a)

element

b)

proton

c)

compound

d)

electron

16.

What subatomic particle is found in the space surrounding the nucleus of an atom?

a)

protons

b)

electrons

c)

neutrons

17.

How can you find the # of neutrons in an atom?

a)

protons + electrons

b)

atomic mass + protons

c)

atomic # - protons

d)

atomic mass - atomic #

18.

Which subatomic particle has a neutral/no charge?

a)

protons

b)

neutrons

c)

electrons

19.

Which subatomic particle has a positive charge?

a)

protons

b)

neutrons

c)

electrons

20.

If an element has an atomic # of 3 and an atomic mass of 7, what is the total number of protons?

a)

3

b)

4

c)

7

d)

10

21.

If an element has an atomic # of 3 and an atomic mass of 7, what is the total number of neutrons?

a)

3

b)

4

c)

7

d)

10

22.

If an element has an atomic # of 3 and the # of neutrons is 4, what is the # of electrons?

a)

3

b)

4

c)

7

d)

10

23.

Which letter represents the element's name?

a)

a

b)

b

c)

c

d)

d

24.

Which letter represents the element's atomic number?

a)

a

b)

b

c)

c

d)

d

25.

Which letter represents the element's atomic mass?

a)

a

b)

b

c)

c

d)

d

26.

Which letter represents the element's symbol?

a)

a

b)

b

c)

c

d)

d

27.
Which element has an atomic number of 1?
a)
Lithium
b)
Oxygen
c)
Hydrogen
d)
Francium
28.
Which element has an atomic number of 6?
a)
Carbon
b)
Nitrogen
c)
Xenon
d)
Sodium
29.
Which element has an Atomic Number of 10?
a)
Neon (Ne)
b)
Calcium (Ca)
c)
Gold (Au)
d)
Potassium (K)
30.
Which element has the HIGHEST atomic number out of the following? (HINT - They are all in the 1st column)
a)
Hydrogen (H)
b)
Lithium (Li)
c)
Sodium (Na)
d)
Potassium (K)
31.
Which element has the LOWEST Atomic Number out of the following? (HINT - they are all listed in the Halogen column)
a)
Bromine (Br)
b)
Chlorine (Cl)
c)
Iodine (I)
d)
Astatine (At)
32.
Which of the following elements is a Noble Gas?
a)
Lithium (Li)
b)
Argon (Ar)
c)
Boron (B)
d)
Bromine (Br)
33.
Fluorine has an atomic number of 9. How many protons does it have?
a)
4
b)
9
c)
12
d)
0
34.
Carbon has 6 protons. Carbon has an atomic mass of 12. How many neutrons does Carbon have?
a)
12
b)
0
c)
2
d)
6
35.
Calcium has an atomic mass of 40 amu. Calcium has 20 protons. How many neutrons does Calcium have?
a)
40
b)
20
c)
0
d)
15
36.
The atomic number of Helium is 2. Helium has an atomic mass of 4. How many neutrons does Helium have?
a)
4
b)
8
c)
1
d)
2
37.
Sulfur (atomic number = 16) has an atomic mass of 32. How many Protons and Neutrons does Sulfur have?
a)
P = 18, N = 14
b)
P = 16, N = 14
c)
P = 16, N = 16
d)
P = 30, N = 2
38.
Which is the best definition of a molecule? 
a)
Marshmallows that are stuck together.
b)
A mixture of different elements.
c)
Two or more atoms chemically bonded together.
d)
The smallest form of matter, consisting of protons, neutrons, and electrons.
39.
CO2 (Carbon Dioxide) is a compound. What 2 elements are found in this compound?
a)
Calcium, Oxygen
b)
Chlorine, Osmium
c)
Carbon, Oxygen
d)
Silicon, Osmium
40.

What two elements are found in table salt (NaCl)?

a)

Nitrogen and Carbon

b)

Sodium and Chlorine

c)

Hydrogen and Chlorine

d)

Calcium and Nickel

41.

The Law of Conservation of Matter

a)

tells how many atoms of an element are contained in one molecule or formula unit.

b)

the starting materials in a chemical reaction

c)

the new substances that are formed in a chemical reaction

d)

A law stating that atoms are not created or destroyed during a chemical reaction.

42.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

43.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

44.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

45.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
46.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
47.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
48.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
49.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

50.

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

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

51.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

52.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

53.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

54.

Complete the sentence.


During a chemical reaction, atoms ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

55.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

56.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
57.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
58.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

59.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
60.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
61.
Element or compound?
H2O
a)
element
b)
compound
62.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
63.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
64.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
65.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
66.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
67.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
68.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed

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