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Chemistry Challenge

Total questions: 169

Worksheet time: 2hrs 7mins

Name
Class
Date
1.

Number of valence electrons in halogens is ..........

a)

1

b)

4

c)

3

d)

7

2.
These are found on the Periodic Table.
a)
Compounds
b)
Elements
c)
Mixtures
3.

the positively charged subatomic particle contained in the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

4.

a subatomic particle, contained in the nucleus of an atom, having the same mass as a proton but no electrical charge

a)

proton

b)

neutron

c)

electron

d)

matter

5.

a negatively charged subatomic particle that orbits the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

6.

Which color on the image of the periodic table corresponds with the noble gases.

a)

red

b)

black

c)

blue

d)

orange

7.
What is krypton?
a)
element
b)
compound
c)
mixture
8.
What are the two structures found in the atom's nucleus?
a)
Electrons and Neutrons
b)
Protons and Electrons
c)
Protons and Neutrons
d)
Neutrons and Electrons
9.
What does the atomic number tell you?
a)
Number of Protons
b)
Number of Neutrons
c)
Sum of protons and neutrons
10.

Use your periodic table to find which element has 5 protons.

a)

Lithium

b)

Calcium

c)

Boron

d)

Neon

11.

The neutron has a ________________ charge.

a)

negative

b)

neutral

c)

positive

d)

low

12.
Which of the following is NOT a characteristic of most metals?
a)
Brittle
b)
Good conductor
c)
Ductile
d)
Malleable
13.
Pure sodium has luster, bends easily, and conducts electricity.  Based off these properties, it would be classified as?
a)
A Metal
b)
A non metal
c)
A metalloid
14.
Based on the activity series, will this reaction occur?
Br2 (l) + KI (aq) →
a)
Yes
b)
No
15.
What  will be the result of the following: 
Li + NaF ->
a)
Li will replace F
b)
Na will replace Li
c)
Li will replace Na
d)
no reaction will occur
16.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
17.
a substance that is formed as the result of a chemical reaction
a)
Product 
b)
Reactant
c)
Starters
d)
Enders
18.
an atom or molecule which has gained or lost one or more of its valence electrons
a)
Covalent Bond
b)
Chemical Formula
c)
Ion
d)
Compound
19.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
20.
________ result(s) in no new substances.
a)
A physical change
b)
A chemical change
c)
Physical and chemical changes
d)
None of the above
21.
Which is an example of a physical change?
a)
Burning wood
b)
Freezing water
c)
Rust on a car
d)
Cooking food
22.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
23.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
24.

What is the BEST definition of a chemical reaction?

a)

A change in matter that produces one or more NEW substances

b)

When two things combine and EXPLODE.

25.
The force that holds 2 atoms together is called a ________________.
a)
Chemical Reaction
b)
Chemical Bond
c)
Diatomic Chemical
d)
Glue
26.
Which of the following is a chemical change?
a)
water freezes to form ice
b)
sugar dissolves in water
c)
gasoline burns in a car engine
d)
a piece of metal expands when it is heated
27.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
28.
A change in the shape of an object is an example of _________________.
a)
a chemical change
b)
energy
c)
an endothermic change
d)
a physical change
29.

According to the Law of Conservation of Mass,

a)

matter is always created in a chemical reaction

b)

matter is always destroyed in a chemical reaction

c)

matter is created and then destroyed in a chemical reaction

d)

matter is not created or destroyed in a chemical reaction

30.

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

a)
b)
c)
d)
31.

When carbon and oxygen combine chemically, the mass of the product is

a)

greater than the mass of the carbon plus the mass of the oxygen

b)

equal to the mass of the carbon plus the oxygen

c)

equal to the mass of the carbon

d)

less than the mass of the carbon

32.

The equation below shows the products formed when a solution of silver nitrate (AgNO3) reacts with a solution of sodium chloride (NaCl).

AgNO3 + NaCl → NaNO3 + AgCl


In this equation, the total mass of the reactants is

a)

greater than the total mass of the products

b)

equal to the total mass of the products

c)

equal to the mass of AgCl

d)

less than the mass of AgCl

33.

How many total atoms are in this compound? Al2O3

a)

2

b)

5

c)

6

d)

3

34.

A chemical reaction is when...

a)

Atoms and molecules are destroyed

b)

Atoms and molecules are created

c)

Atoms and molecules break apart and regroup to form new products

d)

Atoms and molecules go on vacation and relax a little

35.

What is the reason why Noble gases are so stable?

a)

They have an even number of electrons

b)

They have no electrons

c)

They have a full outer shell of electrons

d)

They bond with other atoms

36.

Covalent bonds are formed between...

a)

2 non-metals

b)

a metal and a non-metal

c)

2 metals

d)

2 ions

37.

Which of these is not a covalent molecule?

a)

MgO

b)

CO2

c)

HCl

d)

CH4

38.

Chlorine has 7 electrons in it's outer shell. How many covalent bonds does it need to make to complete it's outer shell electrons?

a)

1

b)

2

c)

3

d)

4

39.

Oxygen has 6 electrons in it's outer shell. How many covalent bonds does it need to make to complete it's outer shell electrons?

a)

1

b)

2

c)

3

d)

4

40.

Carbon has 4 electrons in it's outer shell. How many covalent bonds does it need to make to complete it's outer shell electrons?

a)

1

b)

2

c)

3

d)

4

41.

What is the correct formula for this molecule?

a)

CH

b)

C1H4

c)

CH4

d)

C4H

42.
What do we call a covalent bond where electrons are shared UNEVENLY or UNEQUALLY?
a)
Ionic
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals Force
43.

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

a)

nothing

b)

gain 7

c)

lose 1

44.

How many valence electrons does Boron have?

a)

1

b)

2

c)

3

d)

4

45.

When an atom loses an electron, it becomes a

a)

positive ion

b)

negative ion

46.

How are ionic bonds formed?

a)

transfer of electrons

b)

sharing of electrons

47.

Water is an example of what?

a)

molecular compound (covalent compound)

b)

ionic compound

48.

Salt is an example of what?

a)

ionic compound

b)

covalent compound

49.

Ionic bonds form between two ions that have

a)

negative charges

b)

positive charges

c)

opposite charges

50.

Cations are...

a)

Positive

b)

Negative

c)

Neutral

51.

Anions are...

a)

Positive

b)

Negative

c)

Neutral

52.

An atom becomes _________ when it gains electrons.

a)

Positive

b)

Negative

c)

Neutral

53.

An atom becomes _______ when it loses electrons.

a)

Positive

b)

Negative

c)

Neutral

54.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
55.

Molecules

a)

Ionic compounds

b)

Covalent compounds

56.

Valence electrons are transferred

a)

Ionic bonds

b)

Covalent bonds

57.

Conducts electricity well when melted or dissolved

a)

Ionic compounds

b)

Covalent compounds

58.

Poor electrical conductivity

a)

Ionic compounds

b)

Covalent compounds

59.

Always a solid at room temperature

a)

Ionic compounds

b)

Covalent compounds

60.

Generally high melting & boiling points

a)

Ionic compounds

b)

Covalent compounds

61.

Generally, atoms form bonds so that _______________.

a)

Each atom loses its electrons

b)

Each atom has a stable electron configuration

c)

Each atom has an unstable electron configuration

d)

Each atom gains electrons

62.

What kind of bond does this show?

a)

Ionic

b)

Covalent

63.

What kind of bonds are shown here?

a)

Covalent

b)

Ionic

64.

What type of bonding does this picture show?

a)

Ionic

b)

Covalent

65.

What type of bonding does this picture show?

a)

Ionic

b)

Covalent

66.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
67.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
68.
Pb(NO3)2  +  KI --> PbI2 + KNO3
What type of reaction is this? 
a)
Synthesis 
b)
Decomposition 
c)
Single Replacement
d)
Double Replacement 
69.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O
70.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
71.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
72.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
73.
When the temperature of matter increases the particles...
a)
speed up and move closer
b)
speed up and move farther apart
c)
slow down and move closer together
d)
slow down and move farther apart
74.
True or False: Gases can be compressed. 
a)
True
b)
False
75.
Which container will have a lower pressure?
a)
left
b)
right
c)
they both have the same pressure
d)
I don't know
76.
If a balloon is cooled what will happen to the volume?
a)
Volume will increase
b)
Volume will decrease
c)
Volume will not change
d)
Balloon freezes to death
77.
In order to convert to Kelvin, you add ______ to the Celsius measurement.
a)
372
b)
273
c)
237
d)
732
78.
What will happen to the volume of a gas under constant temperature if the pressure increases?
a)
Increase
b)
Decrease
c)
Nothing
d)
Explosion!
79.

If I want more sugar to dissolve in water, I should heat the water

a)

true

b)

false

80.
salt water is a 
a)
compound
b)
element
c)
heterogeneous mixture
d)
solution
81.
When a certain amount of solvent cannot hold any more solute it is called a ________ solution.
a)
Diluted
b)
Saturated
82.
Solubility is a ________ property. 
a)
neat 
b)
chemical 
c)
physical 
d)
an organic 
83.

The ______ is the smaller part of the solution.

a)

solute

b)

solvent

c)

system of a down

84.
A saturated solution is______
a)
No more solute can be dissolved
b)
More solute can be dissolved
c)
The solvent and solution
85.
__________ are made up of solutes and solvents.
a)
Solutions
b)
Suspension
c)
Colloid
d)
mixtures
86.
Amount of solute in a given amount of solvent or solution
a)
Concentration
b)
Miscible
c)
Solute
d)
solubility
87.

The electrons in a nonpolar covalent molecule are shared...

a)

Evenly

b)

Unevenly

c)

Electrons are not shared

d)

None of the Above

88.

In a polar covalent bond, the electrons gather around...

a)

The atom with the Greatest Electronegativity

b)

The atom with the Lowest Electronegativity

c)

Each atom Equally

d)

None of the Above

89.
What is the charge of an atom that has gained one electron?
a)
-1
b)
-2
c)
+1
d)
+2
90.
What type of bond is shown in this image?
a)
Ionic
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals Force
91.
The force that holds 2 atoms together is called a ________________.
a)
Chemical Reaction
b)
Chemical Bond
c)
Diatomic Chemical
d)
Glue
92.

In water, hydrogen bonds hold together

a)

hydrogen and oxygen atoms in different molecules.

b)

hydrogen atoms in the same molecule.

c)

hydrogen and oxygen atoms in the same molecule.

d)

hydrogen atoms in different molecules.

93.

Which of the following has the highest boiling point?

a)

HBr

b)

HI

c)

HF

d)

HCl

94.

Hydrogen bonds _______as compared to the covalent bonds.

a)

are weaker

b)

have fluctuating strengths

c)

are of equal strength

d)

are stronger

95.

The correct ranking of bonds or forces in order from strongest to weakest is:

a)

covalent bond, van der Waals force, hydrogen bond

b)

van der Waals force, hydrogen bond, covalent bond

c)

hydrogen bond, covalent bond, van der Waals force

d)

covalent bond, hydrogen bond, van der Waals force

96.

Polar molecules tend to have lower boiling points than nonpolar molecules.

a)

true

b)

false

97.

BRASS is made when copper dissolves in Zinc. This is an example of:

a)

solution

b)

colloid

98.
Sugar water is a 
a)
solution
b)
suspension
c)
colloid
99.
What type of mixture separates upon standing?
a)
Solution
b)
Alloy
c)
Colloid
d)
Suspension
100.
type of mixture that doesn't separate on its own but still contains undissolved particles
a)
solution
b)
colloid
c)
suspension
101.

Which substance is MOST soluble at 0 ºC?

a)

KCI

b)

NaNO3

c)

NaCl

d)

Ce2(SO4)3

102.
Sugar water let's light pass through, and is a homogeneous mixture
a)
solution
b)
suspension
c)
colloid
103.

A type of mixture where the particles are larger than those in a solution but not heavy enough to settle out.

a)

Homogeneous mixture

b)

Colloid

c)

Suspension

d)

Compound

104.
What type of mixture is this?
a)
heterogeneous 
b)
homogeneous
105.
Fog is an example of a ____. 
a)
colloid
b)
compound 
c)
solution
d)
substance
106.
The air around was is  a mixture of gases.
a)
True
b)
False
107.

Air has no weight.

a)

True

b)

False

108.

Air is made up of a mixture of many different kinds of gases.

a)

True

b)

False

109.

Which box below shows a more dense object?

a)

Left

b)

Right

110.

A fraction of crude oil is made up of:

a)

Hydrocarbons of similar chain lengths

b)

Numbers

c)

Large hydrocarbons

d)

Alkenes only

111.

Shorter hydrocarbons have:

a)

Higher boiling points

b)

Lower boiling points

112.

What is the structure shown?

a)

Methane

b)

Propane

c)

Ethane

d)

Butane

113.

Distillation is a technique which separates substances based on which physical property?

a)

density

b)

viscosity

c)

boiling point

d)

melting point

114.

A sour taste is a characteristic of:

a)

acids

b)

bases

c)

neutral

d)

pH scale

115.

A substance that is 3 on the pH scale would be a(n):

a)

acid

b)

base

c)

neutral

d)

solute

116.

Taste bitter

a)

acids

b)

bases

c)

neutral

d)

pH paper

117.
What is measured with a graduated cylinder?
a)
Passage of time
b)
Distance from one thing to another
c)
Weight of an object
d)
Volume of liquid
118.

What is the reading of the meniscus?

a)

36mL

b)

45mL

c)

35.0mL

d)

30.5mL

119.
What is the atomic number of this atom?
a)
4
b)
5
c)
9
d)
none of the above
120.
What is a valence electron?
a)
an electron that is found in the outermost orbital of an atom. 
b)
an electron found in the innermost orbital of an atom.
c)
an electron found in the middle orbital.
121.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
122.
What is the molar mass of Mg3N2?
a)
191.6 g/mol
b)
76.64 g/mol
c)
38.32 g/mol
d)
100.95 g/mol
123.
Find the mass in grams of 0.75 moles of magnesium (Mg).
a)
32 grams
b)
18 grams
c)
2.21 x 10 ^23 grams
124.

What is the reading of the meniscus?

a)

36mL

b)

45mL

c)

35.0mL

d)

30.5mL

125.

Taste bitter

a)

acids

b)

bases

c)

neutral

d)

pH paper

126.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
127.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?

a)
b)
c)
d)
128.

What is Avogadro's number?

a)

6.02 x 1023

b)

1 mole

c)

600 million

d)

6.02

129.

One mole of carbon dioxide (CO2) contains 6.02 x 1023 _____.

a)

atoms

b)

formula units

c)

ions

d)

molecules

130.

How many atoms are in 1 mole of Iodine (I)?

a)

6.022 x 1023

b)

4.022 x 1023

c)

6.022 x 1025

d)

4.022 x 1025

131.

Molar mass of NaOH is ______________________

a)

40 grams/mol

b)

50 grams/mol

c)

45 grams/mol

d)

38 grams/nol

132.

How many liters would you need to make a 1 M solution if you have 6 mol of sodium hydroxide (NaOH)?

a)

2

b)

3

c)

4

d)

6

133.

A solution that is able to dissolve additional solute is best described as _____.

a)

supersaturated.

b)

saturated.

c)

unsaturated.

134.

if something can burn then it is-------------

a)

flammable

b)

cold

c)

easy to break

d)

turns black

135.
Paper burning is a __________________ change. 
a)
physical
b)
chemical
136.
Consider the picture of the jar holding oil, syrup, and water. It would be easy to pour off the oil to separate from both the syrup and water because the liquids have different
a)
densities
b)
masses
c)
temperatures
d)
volumes
137.

What is the number of valance electrons in Iodine ?

a)

1

b)

3

c)

53

d)

7

138.
Which atom has the largest atomic radius?
a)
potassium
b)
rubidium 
c)
francium
d)
cesium
139.

Ionization energy is...

a)

the energy required to add an electron to a specific atom

b)

The energy needed to remove one of the valance electrons in an atom .

c)

the energy required to shield the outer electrons from the nucleus

d)

a measure of the ability of an atom to attract electrons

140.
Electronegativity is...
a)
how good an atom is at attracting electrons
b)
the ability of an atom to lose electrons
c)
the energy required to remove an electron from a specific atom
d)
how easy it is to make friends. 
141.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
142.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
143.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
144.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
145.
What is a double bond?
a)
a bond between two atoms
b)
one pair of electrons shared between two atoms
c)
two pairs of electrons shared between two atoms
d)
James Bond's brother
146.

Protons + __________ = atomic mass

a)

electrons

b)

neutrons

c)

neither

147.

tool used to measure the MASS of an object

a)

graduated cylinder

b)

beaker

c)

test tube

d)

balance scale

148.

When water changes state, from ice to steam, it is a ____________ change in matter

a)

chemical

b)

combustion

c)

physical

d)

solubility

149.

When heat is added to matter, what happens to its particles?

a)

They move slower.

b)

They move closer together.

c)

They move faster.

d)

They do not change.

150.
Which property of matter tells what something feels like?
a)
color
b)
shape
c)
texture
d)
solubility 
151.
What is it called when matter changes from a solid to a liquid?
a)
melting
b)
evaporating
c)
condensation
d)
freezing
152.
Wax paper is:
a)
transparent
b)
translucent
c)
opaque
153.

2. Holly has a cube of sugar. She crushes it into powder. What has changed about the sugar?

a)

The mass

b)

The weight

c)

The shape

d)

The shape and the mass

154.
In an experiment, the factor that we observe and/or measure is called the ____.
a)
independent variable
b)
dependent variable
c)
random variable
d)
controlled variable
155.
What type of data is shown here?
a)
qualitative
b)
quantitative
156.
What type of data is shown here?
a)
qualitative
b)
quantitative
157.
The best data to support a claim is called the 
a)
observations
b)
evidence
c)
qualitative
d)
quantitative
158.
What tool would you use to check the temperature of the water?
a)
ruler
b)
microscope
c)
thermometer
d)
ruler
159.

Which of the following is a test tube?

a)
b)
c)
d)
160.
Protect eyes while doing an experiment
a)
Goggles
b)
Microscope
c)
Balance
d)
Hans Lens
161.

What is this science tool?

a)

jar

b)

beaker

c)

thermometer

d)

ruler

162.
What tool is used to measure the mass of an object?
a)
meter stick
b)
graduated cylinder
c)
spring scale
d)
balance
163.

What is the name of the tool shown?

a)

Goggles

b)

Lab coat

c)

Gloves

d)

Binoculars

164.

What is the name of the tool show?

a)

Tube

b)

Needle

c)

Dropper

d)

Syringe

165.
What is this?
a)
striker
b)
eye dropper
c)
tongs
d)
goggles
166.
a)
hot plate
b)
electronic balance
c)
bunsen burner
d)
scales
167.

What is this?

a)

beaker

b)

telescope

c)

microscope

d)

spring scale

168.

What is this?

a)

A Beaker

b)

An Erlenmeyer Flask

c)

A Test Tube

d)

A Vial

169.

An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?

a)

0

b)

7

c)

6

d)

13

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