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Chemical Equations

Total questions: 56

Worksheet time: 35mins

Name
Class
Date
1.

In a chemical equation...

a)

a new substance is formed

b)

new atoms are formed

c)

old atoms disappear

d)

a equal sign is always used

2.

Reactants are

a)

new substances

b)

old substances

c)

likely to disappear

d)

likely to appear

3.

Products are

a)

old substances

b)

new substances

c)

atoms that disappear

d)

atoms that do not exist

4.

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

a)

top, bottom

b)

right, left

c)

left, right

d)

bottom, top

5.

An arrow in a chemical equation means the reaction is irreversible.

a)

True

b)

False

6.

Worded equations provide the amount of each substance in the reaction

a)

True

b)

False

7.

The law of conservation of mass states

a)

chemical reactions create new atoms

b)

atoms cannot be created or destroyed

c)

reactants vanish once a reaction takes place

d)

products appear when a reaction takes place

8.

The amount of atoms on each side of a chemical equation are

a)

different

b)

the same

9.

How many Potassium (K) atom are there?

a)

1

b)

2

c)

3

d)

4

10.

How many Iron (Fe) and Oxygen (O) are there?

a)

Fe = 1, O = 2

b)

Fe = 2, O = 3

c)

Fe = 2, O = 1

d)

Fe = 1, O = 3

11.

How many Hydrogen (H) and how many Chlorine (Cl) are there?

a)

H = 4, Cl = 1

b)

H = 4, Cl = 0

c)

H = 4, Cl = 3

d)

H = 4, Cl = 4

12.

How many molecules are there?

a)

3

b)

6

c)

12

d)

18

13.

Which of the following is true?

a)

H = 6, So = 4

b)

H = 3, So = 4

c)

H = 6, So = 12

d)

H = 6, So = 2

14.

The products of a reaction have the same ________as the reactants.

a)

molecule

b)

atoms

c)

subscripts

d)

coefficients

15.

Chemical equations

a)

give directions for naming compounds

b)

describe only biological changes

c)

describe chemical reactions

d)

show how to write formulas

16.

Identify the Reactants in this equation.

a)

A

b)

B

17.

Is the compound in the pink box a Reactant or a Product?

a)

Reactant

b)

Product

18.

How many atoms of oxygen are represented in the picture?

a)

2

b)

3

c)

5

d)

6

19.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
20.

The _____ describes the atoms in a compound.

a)

Chemical Equation

b)

Chemical Formula

c)

Chemical Symbol

d)

Coefficient

21.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

22.

Element or Compound?

H2O

a)

Element

b)

Compound

23.

Which is the correct formula for:

3 Hydrogen (H)

1 Sulfur (S)

4 Oxygen (O)

a)

H3SO4

b)

HSO4

c)

H4S3O

d)

H2O

24.

How many TOTAL atoms are in:

H2SO4

a)

6

b)

5

c)

7

d)

3

25.

How many atoms of Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

3

d)

6

26.

Which of the following is MOST reactive?

a)

Lithium

b)

Lead

c)

Tin

d)

Copper

27.

Which metal is more reactive than calcium?

a)

magnesium

b)

potassium

c)

silver

d)

aluminum

28.
Which two groups on the Periodic Table are the MOST reactive?
a)
Group 1 and Group 17
b)
Group 2 and Group 16
c)
Group 13 and Group 15
d)
Group 17 and Group 18
29.
How many valence electrons are elements trying to reach in their outer shells?
a)
1
b)
2
c)
5
d)
8
30.
What determines the reactivity of an element?
a)
Size of its nucleus
b)
Number of total electrons
c)
Number of valence electrons
d)
Number of shells
31.
How do you determine the number of valence electrons an element has?
a)
Look at its period
b)
Look at its group
c)
Look at its atomic number
d)
Look at its atomic mass
32.

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

33.

Which elements have the most similar chemical properties?

a)

boron and carbon

b)

oxygen and sulfur

c)

aluminum and bromine

d)

argon and silicon

34.

 

What element contains 7 protons and 5 valence electrons?

a)

Boron

b)

Vanadium

c)

Nitrogen

d)

Lithium

35.

A student is shown a picture of the atom to the side. What element, based on the subatomic particles in the atom, is shown?

a)

Beryllium

b)

Lithium

c)

Helium

d)

Oxygen

36.

The atomic number of an element is equal to its number of protons. Therefore, a logical conclusion is that the number of protons determines an element’s-

a)

Mass and atomic weight.

b)

The number of stable isotopes.

c)

Identity

d)

State of matter

37.

Compare the data shown in the table. What reasonable conclusion can be made from the information given?

a)

Element 1 has the same atomic mass as Element 4

b)

Element 3 has a very similar chemical properties as Element 4

c)

Element 1 has very similar chemical properties as Element 3

d)

None of the above

38.

Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?

a)

Tin atoms have 50 protons.

b)

Tin atoms have five valence electrons.

c)

Tin atoms have 119 neutrons.

d)

Tin atoms have 68 electrons.

39.

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

a)

The element is fluorine, and it is not very reactive.

b)

The element is sodium, and it is not very reactive.

c)

The element is sodium, and it is highly reactive.

d)

The element is fluorine, and it is highly reactive.

40.

Students were asked to identify the location of elements in the periodic table based on clues printed on game cards.

Based on the data, which periodic table shows the correct location of the four elements?

a)
b)
c)
d)
41.

Which of the following is a compound?

a)

Si

b)

CO2

c)

Cl

d)

He

e)

Ti

42.

Which of the following represents an element?

a)

H2O

b)

HCl

c)

NaCl

d)

Au

e)

CaCO3

43.

What is NOT made up of two or more elements that are chemically combined?

a)

Element

b)

Compound

c)

Mixture

d)

Solid

e)

Liquid

44.

How many elements are there in CuSO4?

a)

1

b)

2

c)

3

d)

4

e)

5

45.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

46.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
47.
Measure mainly of the nuclear particles: protons + neutrons
a)
Subatomic Particles
b)
Atomic Number
c)
Atomic Mass
d)
Gluons
48.
Value representing the number of protons in an element
a)
Atomic Mass
b)
Mass Number
c)
Valence Electrons
d)
Atomic Number
49.
Subatomic particles that are neutral in charge
a)
Neutrons
b)
Protons
c)
Nucleus 
d)
Electrons
50.
A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass
a)
Electron Shells
b)
Orbitals
c)
Electron Cloud
d)
Nucleus
51.
Arrangement of elements organized by atomic number
a)
Electron Cloud 
b)
Periodic Table 
c)
Electron Configuration
d)
None of these
52.
The only element with no neutrons in its nucleus.
a)
Oxygen
b)
Helium 
c)
Hydrogen
d)
Lithium
53.

The smallest particle of an element.

a)

Element

b)

Molecule

c)

Atom

54.

What is the atomic number?

a)

35

b)

18

c)

17

d)

52

55.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
56.
What number indicates an electron?
a)
1
b)
2
c)
3
d)
4

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