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Worksheets

8th grade 2nd quarter

Total questions: 80

Worksheet time: 1hrs 3mins

Name
Class
Date
1.

This particle balances the charges from the protons to make the atom neutral

a)

proton

b)

electron

c)

neutron

d)

nucleus

2.

These particles are found in the nucleus

a)

protons and electrons

b)

nucleus and neutrons

c)

protons and neutrons

d)

electrons and neutrons

3.
True or False: The majority of an atom is made up of empty space
a)
True
b)
False
4.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

5.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
6.

What type of substance cannot be broken down into simpler substances?

a)

Elements

b)

Compounds

c)

Mixtures

7.

What is the smallest piece of matter that can still be identified as its element?

a)

Protons

b)

Atoms

c)

Nucleus

8.

The electron cloud of an atom is broken down into smaller pieces called...

a)

the nucleus

b)

cloud formations

c)

energy levels

9.

What is the name of a vertical column on the periodic table?

a)

Period

b)

Group

c)

Table

10.
Atoms combine to form _______. 
a)
electrons
b)
molecules
c)
nuclei
d)
neutrons
11.

The element lithium has atomic number of 3. Its atomic mass is 7. How many protons does a lithium atom have? [Type your answer]

(a)  

12.

Use your periodic table to answer the following question.

Which of the following atoms has 6 protons?

a)

Carbon (C)

b)

Silicon (Si)

c)

Sulfur (S)

d)

Argon (Ar)

13.

The diagram shows an atom. What atom is it?

a)
b)
c)
d)
14.

What is the name for the center of the atom where the protons and neutrons are located?

a)

Atomic weight

b)

Atomic number

c)

Nucleus

d)

Electron cloud

15.
Which of the following is found farthest from the center of an atom?
a)
nucleus
b)
proton
c)
neutron
d)
electron
16.
How do you find the number of neutrons in an atom?
a)
It is also the atomic number
b)
It is also the atomic mass
c)
Add the atomic mass and the atomic number
d)
Subtract the atomic number from the atomic mass
17.
All atoms of an element have the same number of _____________.
a)
neutrons
b)
electrons
c)
protons
d)
atomic mass
18.
What kind of charge do neutrons have?
a)
positive 
b)
negative
c)
neutral
d)
-3
19.
The protons in an atom’s nucleus have what kind of charge?
a)
positive
b)
negative
c)
neutral
d)
no charge
20.

The element lithium has atomic number of 3. Its atomic mass is 7. How many protons does a lithium atom have? [Type your answer]

(a)  

21.

The element lithium has atomic number of 3. Its atomic mass is 7. How many neutrons does a lithium atom have? [Type your answer]

(a)  

22.

Use your periodic table to answer the following question.

Which of the following atoms has 6 protons?

a)

Carbon (C)

b)

Silicon (Si)

c)

Sulfur (S)

d)

Argon (Ar)

23.

Use your periodic table to answer the following question.

Which of the following atoms has 10 protons?

a)

Fluorine (F)

b)

Neon (Ne)

c)

Sodium (Na)

d)

Magnesium (Mg)

24.

How many neutrons are in a phosphorus atom?

a)

15

b)

31

c)

16

d)

46

25.

What is the atomic number of gold?

a)

79

b)

197

c)

118

d)

276

26.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
27.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
28.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
29.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
30.
A pure substance that cannot be broken down into simpler substances.
a)
element
b)
compound
c)
molecule
d)
carbon dioxide
31.
Element or compound?
O2
a)
Element
b)
Compound
32.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
33.

The first letter of an element is always ...

a)

a lowercase letter

b)

a uppercase letter

c)

a number

d)

the letter H

34.

The second letter of an element is always a(n)...

a)

vowel

b)

uppercase letter

c)

consonant

d)

lowercase letter

35.

An area of land that drains to a particular river, lake, bay, or other body of water.

a)

Tributary

b)

Wetland

c)

Divide

d)

Watershed

36.

All bodies of fresh water, salt water, ice, and snow that are found above ground

a)

Groundwater

b)

Surface water

c)

Runoff

d)

Swimming pool

37.
An area of permeable layer of rock or soil that holds a large amount of water in the saturated zone is called what?
a)
Aquifer
b)
Spring
c)
Well
d)
Reservoir
38.
Water stored  in cracks and pores below the Earth's surface is called:
a)
Groundwater
b)
Bogs
c)
Water in the ground
d)
surface water
39.
Sand is ___________, meaning that water can pass through easily.
a)
Permeable
b)
Impermeable
c)
Solid
d)
Soft
40.

In a covalent bond, atoms ____________ electrons

a)

gain

b)

lose

c)

share

41.

The atom closer to the electrons in a polar molecule develops ______________

a)

a positive charge

b)

a negative charge

c)

no charge

42.

The atom further from the electrons in a polar molecule develops ____________

a)

a positive charge

b)

a negative charge

c)

no charge

43.

A molecule that has a partial positive end and a partial negative end because of unequal sharing of electrons is a _______________.

a)

nonpolar molecule

b)

polar molecule

c)

ionic compound

d)

metalic compound

44.

Water, H2O, is classified as what type of molecule?

a)

a polar molecule

b)

a nonpolar molecule

c)

a coordinate covalent compound

d)

an ionic compound

45.

The attractive intermolecular forces that pull molecules of a liquid together are called ___

a)

adhesive forces

b)

cohesive forces

c)

covalent bonds

d)

polar covalent bonds

46.

What are the loose, somewhat fleeting, intermolecular bonds between water molecules called?

a)

hydrogen bonds

b)

oxygen bonds

c)

water bonds

d)

polar covalent bonds

47.

Water molecule is composed of

a)

1 Hydrogen atom and 2 Oxygen atoms

b)

3 Oxygen atoms

c)

2 Hydrogen atoms and 1 Oxygen atoms

d)

2 helium atoms and 1 Oxygen atom

48.

What is the definition of the word "molecule"

a)

at least two different elements of atoms bonded together

b)

what something is made of

c)

molecules that are made up of hydrogen and oxygen

d)

heat and energy

49.

The clinging of one substance to another. Ex. Water in a glass that shows a meniscus.

a)

cohesion

b)

adhesion

c)

thermal energy

50.

what is water called?

a)

the universal solvent

b)

the universal solute

c)

the most acidic solution

51.

If a lemon as a pH of 2 is it

a)

basic

b)

acidic

c)

neutral

52.

pH scale is used to describe how acidic and basic a solution is.

a)

true

b)

false

53.

Oxygen has a slightly negative charge

a)

true

b)

false

54.

hydrogen in a water molecule has a slightly positive charge

a)

true

b)

false

55.

water bugs can walk on top of water because

a)

hydrogen bonds create surface tension

b)

the water is ice

c)

the water is a solution with heavy material

d)

evaporative cooling

56.
A water molecule has the chemical formula H2O. This means that the water molecule is made up of
a)
Two hydrogen atoms and one oxygen atom.
b)
Two oxygen atoms and one hydrogen atom.
c)
Two hydrogen atoms and two oxygen atoms.
d)
Two molecules of water.
57.
The water molecule is
a)
Slightly negative near the hydrogen atoms and slightly positive near the oxygen atom
b)
Slightly positive in all areas of the molecule
c)
Slightly negative near the oxygen atom and slightly positive near the hydrogen atoms
d)
The same charge in all areas of the molecule
58.

A native species is

a)

a species that lives in the region where it evolved.

b)

a species that came from ancient ecosystems

c)

a species that can out produce other species

d)

a species that was brought to a region by people

59.

A non-native species is

a)

a species that lives in the region where it evolved.

b)

a modern plant that was produced by plant breeders

c)

a species from elsewhere that was brought to the region by humans either intentionally or on accident.

d)

a species that was not used by indigenous people.

60.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
61.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
62.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
63.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
64.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
65.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
66.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
67.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
68.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
69.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
70.

Which is the Law of Conservation of Matter?

a)

matter cannot be created or destroyed, it only rearranges

b)

matter can be created but it cannot be destroyed, it never rearranges

c)

matter can be destroyed but it cannot be created, it usually just rearranges

d)

matter is an unproven theory created by Hans Geiger

71.
Which one is a compound?
a)
Co
b)
Br
c)
Fe
d)
CO
72.
Which one is an element?
a)
Co
b)
CO
c)
CO2
d)
CO3-2
73.

Which of the following pollutants can cause an overgrowth of algae?

a)

Phosphate

b)

Nitrate

c)

Both phosphates & nitrates

74.

_________ sources of water pollution are relatively easy to monitor and regulate, while _____________ sources of water pollution are difficult to monitor and clean up.

a)

Domestic; industrial

b)

Primary; tertiary pollutant

c)

Point; nonpoint

d)

Nonpoint; point

75.
Attractions between water molecules are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
76.

Which image is the best example of adhesion?

a)

b)

77.

How many molecules are represented in the formula 3CO2?

a)

3 carbon, 2 oxygen

b)

6 carbon dioxide

c)

3 carbon dioxide

d)

3 carbon, 6 oxygen

78.

What will have more mass when a chemical change is complete: the reactants before the chemical reaction or the product after the reaction is complete?

a)

They both will have the same mass

b)

The product always has more mass than the reactant

c)

The reactant will have more mass than the product

d)

They both will lose mass after the reaction

79.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
80.

The Law of Conservation of Matter states that the total amount of matter _____ after it undergoes change.

a)

disappears

b)

stays the same

c)

weighs less

d)

explodes

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