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Atoms/Ions/Valence/LOCM

Total questions: 23

Worksheet time: 18mins

Name
Class
Date
1.

How is an atom and ion different?

a)

An atom has a charge and an ion has no charge.

b)

An atom has no charge and an ion has a charge.

2.

What is another name for a positive ion?

a)

atom

b)

cation

c)

anion

d)

proton

3.

What is another name for a negatively charged ion?

a)

atom

b)

anion

c)

cation

d)

electron

4.

What charge will result if an ion loses electrons?

a)

positive

b)

negative

c)

neutral

5.

What charge results of an ion gains electrons

a)

positive

b)

neutral

c)

negative

6.

What charge will result if an ion gains 3 electrons?

a)

+3

b)

+1

c)

-3

d)

-2

7.

What charge will atoms in group 1 have?

a)

+2

b)

+1

c)

-1

d)

-2

8.

What group does this atom belong to?

a)

Group 2

b)

Group 9

c)

Group 17

d)

Group 7

9.

What are valence electrons?

a)

The total number of electrons in an atom

b)

The number of electrons in the outermost shell

c)

The number of electrons in the second shell

d)

The number of protons in the outermost shell

10.
a)
2
b)
8
c)
3
d)
13
11.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

12.

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

a)

31

b)

5

c)

15

d)

4

13.
How many valence electrons are found in atoms of group 1?
a)
7
b)
6
c)
4
d)
1
14.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
15.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
16.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
17.
Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?
a)
50 g
b)
100 g
c)
200 g
d)
400 g
18.

How many Ca (Calcium) atoms are found in Ca(OH)2?

a)

5 atoms

b)

3 atoms

c)

2 atoms

d)

1 atom

19.

How many atoms do you have in the compound 2MgCl2?

a)

2 atoms

b)

4 atoms

c)

6 atoms

d)

8 atoms

20.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

21.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

22.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
23.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3

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