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Unit 1 - Properties & Conservation of Mass

Total questions: 62

Worksheet time: 1hrs 19mins

Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many Oxygen are in H2O?
a)
1
b)
2
c)
0
d)
4
3.

2H2 + O2 ----> 2H2O What are the products?

a)
------>
b)
2H2O
c)
2H2+ O2
4.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
5.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
6.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
7.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
8.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
9.
(Element or Compound)
       C2H8O 
a)
Element
b)
Letters
c)
Numbers
d)
Compound
10.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
11.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
12.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
13.

A capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________

a)

chemical symbol

b)

abbreviation

14.

A subscript is the small number below and to the right of a(n) ________ that tells the number of _______ of that element.

a)

element symbol; atoms

b)

atom; element symbol

c)

subscript; protons

d)

compound; elements

15.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------>  H20
b)
C + 2H2 ---->  CH4
c)
2Fe2O3  ------> 2O2 + 4Fe
16.

The law of conservation of matter states that

a)

chemical reactions change matter.

b)

it is mandatory that you recycle.

c)

atoms are neither created nor destroyed in chemical reactions.

d)

a chemical equation can be balanced or unbalanced.

17.

If there is no subscript by an element in a chemical formula, how many atoms of that element are there?

a)

0

b)

2

c)

only 1

d)

1 million

18.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
19.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
20.

Which chemical equation is balanced?

a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
21.
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.
22.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
23.
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)

Chemical equations must have the same number and type of atoms before and after a reaction

24.

A chemical reaction is balanced when

a)

both sides have the same elements

b)

Both sides have the same number and type of atoms

c)

Same subscripts

d)

Same coefficients

25.

The big number in front of a chemical formula is a __________ and it tells us the number of __________ present in that formula

a)

Subscript; Atoms

b)

Coefficient; Molecules

c)

Superscript;Molecules

d)

Charge;Atoms

26.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
27.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

28.

Mass cannot be created or__________ during a chemical reaction?

a)

Reacted

b)

Transferred

c)

Born

d)

Destroyed

29.

Which compounds are the PRODUCTS of this reaction?

a)

CO2 + H2O

b)

C6H12O6 + O2

c)

C6H12O6 + CO2

d)

H2O + O2

30.

Which compounds are the REACTANTS of this reaction?

a)

CO2 + H2O

b)

C6H12O6 + O2

c)

C6H12O6 + CO2

d)

H2O + O2

31.

How many different elements are in the REACTANTS side of this balanced equation?

a)

1

b)

2

c)

3

d)

4

32.

2Al2O3 is on the ____________ side of this equation.

a)

Reactants

b)

Products

33.

Dissolving sugar in water is an example of a _____.

a)

Homogeneous Mixture

b)

Heterogeneous Mixture

34.
Which is an example of a physical property?
a)
ability to react with acid
b)
 state of matter
c)
flammability
d)
ability to react with oxygen
35.

How many Hydrogen atoms are in this chemical formula?

8Fe(H2O)4(OH)2

a)

16

b)

64

c)

72

d)

80

36.

How does the Law of Conservation of Mass apply to chemical reactions?

a)

The reactants must have fewer atoms than the products.

b)

The products must have twice as many atoms as the reactants.

c)

The reactants and products must have exactly the same number and type of atoms.

d)

The reactants and products must have close to the same number and type of atoms.

37.

Which is an example of a heterogeneous mixture?

a)

sugar water

b)

brass

c)

table salt

d)

salad

38.

Smallest and basic particle of matter

a)

element

b)

atom

c)

compound

d)

mixture

39.

A combination of two or more substances that are not chemically combined

a)

element

b)

atom

c)

compound

d)

mixture

40.

A mixture in which different materials can be easily distinguished

a)

heterogeneous mixture

b)

homogeneous mixture

c)

chemical formula

d)

molecule

41.

A group of atoms bonded together

a)

chemical formula

b)

chemical bond

c)

molecule

d)

solution

42.

A mixture that forms when one substance dissolves another

a)

molecule

b)

solution

c)

pure substance

d)

compound

43.

What is CO2 an example of?

a)

Element

b)

Compound

c)

Atom

d)

Mixture

44.

Lemonade consists of several substances that are NOT chemically combined, so lemonade is classified as

a)

pure substance

b)

a compound

c)

a mixture

d)

an element

45.

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

a)

A

b)

B

c)

C

d)

D

46.

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

a)

The mass of the products is always greater than the mass of the reactants.

b)

The mass of the reactants is less than the mass of the products.

c)

The mass of the reactants equals the mass of the products.

d)

The mass of the reactants is greater than the mass of the products.

47.

What happens to atoms in a chemical reaction?

a)

they are destroyed

b)

they are created

c)

they are rearranged

48.
Pure water is _______ on the pH scale.
a)
Acid
b)
Base
c)
Neutral
49.
If the pH of a solution is 9, it is a....
a)
acid
b)
base
c)
both
d)
none
50.
Which is the stronger acid?
a)
pH 1
b)
pH 4
c)
pH 8
d)
pH 13
51.
Which of the following substances is basic?
a)
Apple juice
b)
Ginger ale
c)
Baking soda
d)
Distilled water
52.

Which pH number below reflects a weak acid?

a)

1

b)

6

c)

8

d)

13

53.

Which pH number below reflects a weak base?

a)

1

b)

6

c)

8

d)

13

54.
What does a pH scale do?
a)
Tells you if a substance is an acid.
b)
Tells you if a substance is a base.
c)
Measures the strength or weakness of an acid or base.
d)
All of these are true.
55.

Which of the following is an example of COHESION?

a)

water sticking to water

b)

water sticking to glass

c)

oil sticking to plastic

d)

hydrogen sticking to oxygen

56.

What is the term for water's ability to defy gravity and climb up a tube?

a)

Capillary Action

b)

Specific Heat

c)

Universal Solvent

d)

Magic

57.

Surface tension of water is the cohesive force between water molecule and other molecule.

a)

True

b)

False

58.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
59.
The tightness across the surface of water that enables paper clips to float is ____________.
a)
adhesion
b)
capillary action
c)
surface tension
d)
polarity
60.
Why does water move from the roots to the leaves of plants?
a)
Water is pushed by solutes
b)
Capillary action pulls the water molecules like a chain
c)
Water is pulled by gravity
d)
Water’s cohesion causes it to “pull” towards the leaves
61.

True or False

This chemical equation demonstrates the Law of Conservation of Matter

a)

True

b)

False

62.

True or False

This chemical equation represents the Law of Conservation of Matter

a)

True

b)

False

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