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Unit 4 - Chemical Interactions - Atoms and Elements

Total questions: 83

Worksheet time: 58mins

Name
Class
Date
1.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

2.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

3.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

4.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

5.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

6.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

7.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

8.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

9.

Using your knowledge of the Law of Conservation of Mass, what would the reactants of original chemical equation yield?

a)

Model A.

b)

Model B.

c)

Model C.

d)

Model D.

10.
What is an element? 
a)
a burner
b)
a mixture
c)
a pure substance
d)
part of a machine
11.
NaCl contains how many elements? 
a)
1
b)
2
c)
3
d)
4
12.

The number of what identifies the element the atom belongs to.

a)

neutrons

b)

Protons

c)

electrons

13.
What is the atomic number?
a)
The number of protons in an element
b)
The number of neutrons in an element
c)
The number of protons and neutrons.
d)
The number of protons and electrons.
14.

At the yield arrow, what happens to the bonds in the molecules of the reactants?

a)

they break

b)

they strengthen

c)

they explode

d)

they don't do anything

15.

What happens to the properties of the reactants when they change into a product during a chemical reaction?

a)

The properties of the reactants stay exactly the same.

b)

The reactants keep some of their old properties and gain a few new ones.

c)

The properties of the reactants change completely to form new substances with new properties.

d)

The reactants disappear without forming any new substances.

16.

What is the element symbol for the element with the atomic number 29 - Copper.

a)

Cu

b)

C

c)

Co

d)

Cr

17.

Which atom model below best represents Hydrogen?

a)

b)

c)

d)

18.

Which atom model below best represents Helium?

a)

b)

c)

d)

19.

Which atom model below best represents Carbon?

a)

b)

c)

d)

20.

Which atom model below best represents Oxygen?

a)

b)

c)

d)

21.

The materials we start with in a reaction are known as __________________ and are found on the left side of a chemical equation.

a)

chemicals

b)

reactants

c)

products

d)

creations

22.

The materials we end with in a reaction are known as __________________ and they are found on the right side of the chemical equation.

a)

chemicals

b)

reactants

c)

products

d)

creations

23.

What is the coefficient in the chemical formula?

a)

2

b)

N

c)

H

d)

3

24.

What is the subscript in the formula for H?

a)

2

b)

N

c)

H

d)

3

25.
Fe2O3 has
a)
2 Iron atoms, 3 oxygen atoms
b)
6 iron atoms, 6 oxygen atoms
c)
3 iron atoms, 2 oxygen atoms
d)
1 iron atom, 6 oxygen atoms
26.

Which part of an equation means YIELDS?

a)

plus signs

b)

chemical fomulas

c)

reactants

d)

products

e)

arrow

27.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
28.

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

a)

2Mg and O2

b)

2MgO

c)

Mg and MgO

d)

O and MgO

29.

What does the C represent?

a)

atomic mass

b)

atomic number

c)

element name

d)

chemical symbol

30.

What does the 6 represent?

a)

atomic mass

b)

atomic number

c)

element name

d)

chemical symbol

31.

What does 12.011 represent?

a)

atomic mass

b)

atomic number

c)

element name

d)

chemical symbol

32.
→2H2O
This number tells how many molecules are in a chemical equation.
a)
coefficient
b)
subscript
c)
compound
d)
element
33.
 2H2O
How many Hydrogen atoms are present?
a)
2
b)
4
c)
1
d)
10
34.
2H2O
How many H2O molecules are present?
a)
1
b)
4
c)
2
d)
8
35.
All matter is made of 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
36.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
37.
How many Protons are in one atom of Lithium?
a)
3
b)
6
c)
7
d)
6.941
38.

Which colored particle is the electron?

a)

blue

b)

red

c)

yellow

d)

red and yellow

39.

NaCl is the chemical formula of

a)

Water

b)

Table Salt

c)

Oxygen gas

d)

Nitrogen gas

40.

The H2O is the chemical formula of

a)

Water

b)

Table Salt

c)

Oxygen Gas

d)

Nitrogen Gas

41.

Identify the chemical formula for carbon dioxide

a)

CO2

b)

H2O

c)

N2

d)

C6H12O6

42.

Identify the chemical formula for nitrogen gas

a)

O2

b)

CO2

c)

N2

d)

NaCl

43.

Identify the chemical formula for oxygen gas

a)

O

b)

O2

c)

CO2

d)

CO

44.
How many carbon atoms are there in a methane molecule? 
a)
0
b)
1
c)
4
d)
5
45.
What is the total number of atoms in an ammonia (NH3) molecule?
a)
1
b)
2
c)
3
d)
4
46.

How many electrons are in the atomic model shown?

a)

2

b)

5

c)

7

47.
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
48.
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
49.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
50.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
51.
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
52.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
53.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

54.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

55.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

56.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

57.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

58.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

59.

Label the parts of the reaction.

a)

Reactants

b)

Products

c)yield sign
d)subscripts
e)coefficients
1
2
1)
2)
60.

Label the parts of the reaction.

a)

Reactants

b)

Products

c)yield sign
d)subscripts
e)coefficients
1
2
1)
2)
61.

The teacher performs a demonstation as seen in the picture. He mixes two clear liquids. How can we tell that a chemical reaction is occurring?

a)

There is a precipitate (precipitation) forming.

b)

There are bubbles (gas) being given off.

c)

The temperature of the liquids are changing.

d)

There is light being given off.

62.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
63.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
64.
Adding baking soda and vinegar together and it fizzes and creates carbon dioxide.
a)
Chemical
b)
Physical
65.
what is burning?
a)
physical change
b)
physical property
c)
chemical change
d)
chemical property
66.

Timothy is doing an experiment. He places a brand new iron nail into a test tube. Fourteen days later he observes an orange powdery substance had formed on a nail submerged in salt water. Has a chemical reaction happened? How does he know (choose the best option below).

a)

No. There is no chemical reaction.

b)

He can conclude that his little sister probably removed the nail and painted it orange.

c)

Yes, there is light and heat produced, a sign of a chemical reaction.

d)

Yes, there has been an obvious color change, a sign of a chemical reaction.

67.

In which state of matter are the particles the moving the fastest?

a)

solid

b)

liquid

c)

gas

68.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
69.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
70.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
71.

How are chemical reactions different from a physical change?

a)

physical changes create a new substance, chemical reactions do not

b)

chemical reactions create a new substance, physical changes do not

c)

chemical reactions happen more, physical changes happen less

d)

physical changes happen more, chemical reactions happen less

72.

What happens at the molecular level during a chemical change in matter?

a)

Chemical changes do not involve any rearrangement of atoms

b)

Atoms are rearranged and chemical bonds are broken and formed

c)

Molecules stay the same but change color

d)

Atoms disappear and reappear in a different form

73.

Explain the concept of chemical reactions in matter.

a)

Chemical reactions occur when substances do not interact and remain the same

b)

Chemical reactions happen only in living organisms

c)

Chemical reactions occur when substances interact to form new substances with the same properties

d)

Chemical reactions occur when substances interact to form new substances with different properties.

74.

Which picture below shows the arrangement of atoms for one nitrogen atom bonded to three hydrogen atoms?

a)
b)
c)
d)
75.

A substance produced by a chemical reaction is called ...

a)

reactant

b)

product

c)

atom

d)

element

76.

Which of the following is NOT an example of a chemical change?

a)

Burning a piece of paper

b)

Baking a cake

c)

Digesting food

d)

Melting a metal can

77.

Is a chemical reaction happening in the picture? If so, what best describes how you can tell.

a)

No. There is no cheical reaction.

b)

Yes, they are adding a clear liquid to another clear liquid and a precipitate is being formed (a solid).

c)

Yes, they are adding a liquid to another clear liquid and bubbles are forming, showing the production of a gas.

d)

Yes, they are adding a liquid to another clear liquid and an endothermic reaction is occurring.

78.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
79.
In an endothermic reaction, heat is ...
a)

taken in or absorbed (gets colder)

b)

given out or released (gets hotter)

80.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
81.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
82.
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? 
a)

It was a cryothermic reaction.

b)
It is an endothermic reaction
c)
It is an exothermic reaction 
d)

It was a hypothermic reaction.

83.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 30° C. Which of the following is true? 

a)

It was a cryothermic reaction.

b)
It is an endothermic reaction
c)
It is an exothermic reaction 
d)

It was a hypothermic reaction.

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