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STAAR Review: 8th Grade Chemistry

Total questions: 60

Worksheet time: 37mins

Name
Class
Date
1.

A horizontal row of elements in the periodic table

a)

Molecule

b)

Period

c)

Family

d)

Atom

2.

The smallest particle of an element.

a)

Element

b)

Molecule

c)

Atom

3.

A combination of two or more atoms

a)

Period

b)

Molecule

c)

Atom

d)

Family

4.

Elements in the same vertical column of the periodic table; also called group

a)

Family

b)

Atom

c)

Element

d)

Metals

5.

What is one way Neutrons are different from electrons?

a)

they both are negative

b)

neutrons have no charge, while electrons have a negative charge

c)

Both are in the nucleus( center of atom)

d)

Electrons are inside nucleus and neutrons are outside the nucleus.

6.

How are electrons similar to neutrons?

a)

Both have negative charge

b)

Both are part of a molecule

c)

Both make up parts of an atom

d)

Both are in nucleus

7.

What is the atomic number?

a)

35

b)

18

c)

17

d)

52

8.

How many protons and electrons does this element have?

a)

35

b)

18

c)

17

d)

52

9.

How many neutrons does Chlorine have?

a)

18

b)

17

c)

35

d)

52

10.

What is the atomic mass of Neon?

a)

10

b)

20

c)

30

11.

How many neutrons does calcium have?

a)

20

b)

40

c)

60

d)

0

12.

What is the atomic mass of Arsenic?

a)

33

b)

107

c)

75

13.

What would Au (Gold) be categorized as on the periodic table?

a)

Nonmetal

b)

Metal

c)

Transitional metal

d)

Noble gas

14.

What would He (Helium) be categorized as on the periodic table?

a)

Nonmetal

b)

Metal

c)

Noble gas

d)

Transitional metal

15.

Protons are

a)

Negative

b)

Positive

c)

No charge

d)

Atomic Number

16.

Neutrons have

a)

Negative

b)

Positive

c)

No charge

d)

Atomic Number

17.

Electrons are are

a)

Negative

b)

Positive

c)

No charge

d)

Atomic Number

18.

In the nucleus you can find the

a)

Protons, neutrons and electrons

b)

Protons and neutrons

c)

Protons and electrons

d)

Neutrons

19.

All of the mass is located in the -

a)

Electron cloud

b)

APE

c)

MAN

d)

Nucleus

20.

The smallest subatomic particle

a)

Protons

b)

Neutrons

c)

Electrons

d)

Atoms

21.

An element has an atomic number of 9 and a mass of 19 amu. What is the number of protons this element has?

a)

9

b)

19

c)

10

d)

28

22.

What is represented by the letter S?

a)

Nucleus

b)

Electron

c)

Proton

d)

Neutrons

23.

What is represented by the letter Q?

a)

Nucleus

b)

Electron

c)

Proton

d)

Neutrons

24.

What gives you the identity of an element?

a)

Mass

b)

Atomic number

c)

Protons

d)

Electrons

25.
Beryllium is in group number______.
a)
Group 2
b)
Group 3
c)
Group 4
d)
Group 7
26.
The period for Bromine is ___________.
a)
3
b)
2
c)
4
27.
What is the name of the group that never reacts--ever ever they are stable with a full outermost ring!!!
a)
noble gases
b)
transition
c)
halogens
d)
borons
28.
Which element is found in group 16 period 3?
a)
Sulfur (S)
b)
Selenium (Se)
c)
Chlorine (Cl)
d)
Carbon (C)
29.
Which element is found  in group 17 period 3?
a)
Chlorine
b)
Flourine
c)
Oxygen
d)
Phosphorous
30.

A substance that is shiny and a good conductor would be classified as a

a)

nonmetal

b)

metalloid

c)

metal

31.

A substance that is dull, brittle, and a nonconductor would be classified as a

a)

metal

b)

nonnmetal

c)

metalloid

32.

A substance that can be hammered into different shapes would be classified as a

a)

metal

b)

nonmetal

c)

metalloid

33.

A shiny and malleable substance that is not always a good conductor of electricity

a)

metal

b)

nonmetal

c)

metalloid

34.

Carbon is dull and brittle. Carbon is a

a)

metal

b)

nonmetal

c)

metalloid

35.

Which elements are to the right of the zig zag?

a)

metals

b)

nonmetals

c)

metalloids

36.

Silicon is shiny, brittle and conducts electricity. It is a:

a)

metal

b)

metalloid

c)

nonmetal

37.
Which of the following is NOT an example of a chemical change?
a)
burning match
b)
a car rusting
c)
baking a cake
d)
melting ice
38.
Which evidence demonstrates that a chemical change has occurred.
a)
water level rises
b)
water becomes cloudy
c)
gas is produced (bubbles)
d)
tablet dissolves
39.

Rust is a sign of ___________________ change.

a)

Chemical

b)

Physical

40.

Precipitant is when you mix two liquid chemicals and something new forms at the bottom of the container. This is ...

a)

Chemical Change

b)

Physical Change

41.

Dissolving sugar into water is an example of ______________.

a)

Chemical Change

b)

Physical Change

42.

When you burn something it can never be undone. Burning is an example of ...

a)

Chemical Change

b)

Physical Change

43.
Marie had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Marie determine about the new substance formed by mixing the baking soda and pickle juice?
a)
A chemical reaction produced a solid.
b)
A chemical reaction produced a gas.
c)
No chemical reaction took place.
d)
Only a physical change happened.
44.
Which of the following characteristics is shared by all chemical reactions?
a)
Produce a precipitate
b)
Show a color change
c)
Release heat energy
d)
Form new substances
45.

How many atoms of sulfur are in each molecule of H2SO4?

a)

1

b)

4

c)

2

d)

7

46.

Alanine is an amino acid with formula C3H7NO2. How many atoms in all are in each molecule of alanine?

a)

3

b)

7

c)

12

d)

13

47.

How many atoms of carbon are in a molecule of vinyl chloride (C2H3Cl)?

a)

1

b)

3

c)

6

d)

2

48.

How many atoms of hydrogen are in a molecule of glucose (C6H12O6)?

a)

12

b)

6

c)

18

d)

4

49.

Which of the following statements accurately describes the number of atoms in a molecule of ammonia (NH3)?

a)

Three atoms of nitrogen and three atoms of hydrogen

b)

One atom of nitrogen and three atoms of hydrogen

c)

Three atoms of nitrogen and one atom of hydrogen

d)

One atom of nitrogen and one atom of hydrogen

50.

Which of the following molecules has the formula CH2O?

a)
b)
c)
d)
51.

Which elements are in the formula shown above?

a)

Tin and Chlorine

b)

Tin, Carbon and Lithium

c)

Sulfur, Nitrogen and Chlorine

d)

Sulfur, Nitrogen, Carbon and Lithium

52.

How many different elements are in an amino acid with the formula C5H11NO2S?

a)

5

b)

20

c)

18

d)

4

53.

What does the number 3 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

54.

What does the number 4 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

55.

In the equation shown, what are the reactant(s)?

a)

N2 + H2

b)

NH3

56.

In the equation shown, what are the product(s)?

a)

N2 + H2

b)

NH3

57.

Is this equation balanced?

a)

Yes

b)

No

58.

Is this equation balanced?

a)

Yes

b)

No

59.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

60.

Which reactant is missing from the equation shown?

(What should go in the place of the "X"?)

a)

One hydrogen atom.

b)

Three hydrogen atoms.

c)

Four oxygen atoms.

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