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Quiz #4 - Molecules and Chemical Reactions

Total questions: 76

Worksheet time: 43mins

Name
Class
Date
1.

Two or more atoms bonded together

a)

Molecule

b)

Subatomic particle

c)

Atom

d)

Element

2.

A substance made up of atoms of two or more different elements joined by chemical bonds

a)

Matter

b)

Mixture

c)

Periodic table

d)

Compound

3.

A pure substance made of only one kind of atom

a)

Element

b)

Pure substance

c)

Mixture

d)

Solubility

4.

Two or more elements or compounds that are physically mixed together but not chemically combined

a)

Mixture

b)

Element

c)

Compound

d)

Atom

5.

A sample of matter, either a single element or a single compound, that has definite chemical and physical properties throughout

a)

Solubility

b)

Atom

c)

Pure substance

d)

Element

6.

How many electrons can fit on the 1st energy level (orbital) for any Bohr Model?

a)

2

b)

6

c)

8

d)

10

7.

Which of these is a compound?

a)

Aluminium (Al)

b)

Carbon Dioxide (CO2)

c)

Nitrogen (N)

d)

Sand

8.

Which of these is an element?

a)

Salt (NaCl)

b)

Water (H20)

c)

Oxygen (O)

d)

Carbon Dioxide (CO2)

9.

Which of these is a mixture?

a)

Laundry Detergent

b)

Salt (NaCl)

c)

Oxygen (O)

d)

Fluorine (Fl)

10.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
11.

An _______________ is made up of one or more of the same kind of atom chemically combined.

a)

atom

b)

element

c)

molecule

d)

compound

12.

A ______________ is made up of different kinds of atoms chemically combined.

a)

element

b)

compound

c)

mixture

d)

molecule

13.

True or False: elements AND compounds are pure substances.

a)

True

b)

False

14.

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

a)

compound

b)

element

c)

molecule

d)

mixture

15.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

d)

solution

16.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

d)

solution

17.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

d)

solution

18.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

19.

Which is a mixture of compounds?

a)
b)
c)
d)
20.

Which is a pure substance?

a)
b)
c)
d)
21.

two or more atoms bonded together is...

a)

an element

b)

a big atom

c)

a molecule

d)

a mixture

22.
Which of the following chemical formulas represents a compound? 
a)
C3
b)
O2
c)
CH3CHO
d)
H2
23.
What is the term for combining 2 or more DIFFERENT atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
24.
Are these molecules also compounds?
a)
YES
b)
NO
25.
Are these molecules also compounds?
a)
YES
b)
NO
26.

Di = two

Mono = one

Atomic = atom

a)

diatomic

b)

monoatomic

27.

Di = two

Mono = one

Atomic = atom

a)

diatomic

b)

monoatomic

28.

Di = two

Mono = one

Atomic = atom

a)

diatomic

b)

monoatomic

29.

Di = two

Mono = one

Atomic = atom

a)

diatomic

b)

monoatomic

30.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
31.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
32.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
33.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
34.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
35.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
36.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
37.
a substance that is formed as the result of a chemical reaction
a)
Product 
b)
Reactant
c)
Starters
d)
Enders
38.
The left side of the equation below is called
a)
Products
b)
Reactants
39.
The right side of the equation below is called the
a)
products
b)
reactants
40.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product 
41.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
42.

Is this equation balanced?

a)

Yes

b)

No

43.

Is this equation balanced?

a)

Yes

b)

No

44.

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

a)

molecule

b)

atoms

c)

subscripts

d)

coefficients

45.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
46.

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

47.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
48.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
49.
A molecule is________
a)
a glob of gelatinous goo
b)
smaller than an atom
c)
filled with raisons
d)
more than one atom bonded together
50.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
51.
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
52.
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
53.

The Coefficient (3) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

54.

The Subscript (2) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

55.

How many Ca (Calcium) atoms are found in Ca(OH)2?

a)

5 atoms

b)

3 atoms

c)

2 atoms

d)

1 atom

56.

How many atoms do you have in the chemical formula 3H2O2?

a)

7 atoms

b)

12 atoms

c)

4 atoms

d)

6 atoms

57.

How many atoms do you have in the chemical formula 2Mg(ClO3)2?

a)

2 atoms

b)

7 atoms

c)

9 atoms

d)

18 atoms

58.

Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because more info is needed.

c)

No, because there are more atoms in the product.

d)

No, because there are more atoms in the reactant.

59.

What is the part of the chemical equation in green called?

Fe + S → FeS

a)

Reactants

b)

Products

c)

Yield

d)

Chemical equation

60.

What happens in a chemical reaction?

a)

Atoms are destroyed.

b)

Atoms are created.

c)

Atoms are rearranged.

d)

Atoms gain/lose atomic mass.

61.

Which statement best describes what happens to atoms in a chemical reaction?

a)

New atoms are created which become products

b)

Some atoms disappear while others multiply to become the products

c)

The atoms of the reactants rearrange to become the products

d)

The atoms of the reactants are transformed into different types of atoms which become the products

62.

Atoms are conserved during a chemical reaction. Pick the statement that best describes what it means for atoms to be conserved in a chemical reaction.

a)

The reactants and products have the same # of atoms but different types of atoms

b)

The reactants and products have the same type of atoms but different numbers of atoms

c)

The reactants and products have the same number and same type of atoms

d)

The reactants always have less atoms than the products

63.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
64.
A molecule is smaller than an atom.
a)
True
b)
False
65.
In a closed system, a chemical reaction takes place.  The mass of the reactants in the beginning of the reaction is 25g.  What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?
a)
25g
b)
You can't tell with the given information.
c)
30g
d)
15g
66.
There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?
a)
47g
b)
13g
c)
23g 
d)
You cant tell with the given information
67.
Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
a)
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
b)
Bubbles were produced during the reaction, which meant that a gas was being produced.
c)
The plastic bag did not change in any way, indicating that it was not involved in the reaction.
d)
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
68.

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

69.

All atoms are most stable with (or would "prefer") how many electrons in their valence shell?

a)

1

b)

2

c)

8

d)

18

70.

When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?

a)

The total number of neutrons in the unknown element

b)

The total number of particles in the nucleus of the unknown element

c)

The number of protons in the nucleus of the unknown element

d)

The number of valence electrons in the unknown element

71.

How do electrons of an element determine that element's reactivity?

a)

If the valence shell has missing electrons it is very reactive to attract or lose more electrons.

b)

If the valence shell has a full ring of electrons it is very reactive because it needs more.

c)

If the valence shell has a full shell of electrons it is very reactive because it is already full.

d)

If the valence shell has missing electrons it is not reactive because it is missing electrons.

72.

Which elements are chemically reactive?

a)

Group 18

b)

Groups 1-17

c)

Groups 3-12

d)

All groups

73.

Which elements are NOT chemically reactive?

a)

Group 18

b)

Groups 1-17

c)

Groups 3-12

d)

All groups

74.

All elements are generally trying to find how many valence electrons?

a)

2

b)

4

c)

6

d)

8

75.

Elements in the same group have the same

a)

mass

b)

energy levels

c)

protons

d)

chemically reactivity

76.

Elements in the same group have the same

a)

energy levels

b)

valence electrons

c)

protons

d)

atomic number

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