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Chemistry pentatlon 2018

Total questions: 107

Worksheet time: 2hrs 50mins

Name
Class
Date
1.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
2.
The smallest particle of any particular type of matter is known by which of the following terms?
a)
Compound
b)
Atom
c)
Chemical
d)
Element
3.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
4.
If an atom has 3 electrons, how many protons does it have?
a)
1
b)
2
c)
4
d)
3
5.
If the number of protons equal the number of _____, the atom will have no charge
a)
protons
b)
neutrons
c)
electrons
d)
nucleus
6.
The subatomic particle with a negative charge is the
a)
electron
b)
proton
c)
neutron
d)
nucleus 
7.
The subatomic particle with a negative charge is the
a)
electron
b)
proton
c)
neutron
d)
nucleus 
8.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
9.
What is the mass number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
10.
An atom with an unequal number of protons and electrons is said to have (a) ___.
a)
no charge
b)
balance
c)
charge
d)
unbalance
11.
Ions are: 
a)
atoms with a positive or negative charge
b)
atoms with no charge
c)
atoms with ONLY a positive charge
d)
atoms with ONLY a negative charge
12.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
13.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
14.
The state of matter that takes the shape of its container is....
a)
Gas
b)
Solid
c)
Liquid
d)
None of these
15.
Thermal energy refers to....
a)
Heat energy
b)
Light energy
c)
Potential Energy
d)
Rotational energy
16.
During a chemical reaction, atoms are NOT
a)
Rearranged
b)
Created
c)
Broken
d)
Growing
17.
The state of matter with the molecules with the LOWEST amount of energy is....
a)
Gas
b)
Solid
c)
Liquid
18.
Which of the following is a REACTANT of photosynthesis?
a)
Oxygen
b)
Carbon dioxide
c)
Sugar
d)
Heat
19.
Which of the following is a PRODUCT of photosynthesis?
a)
Oxygen
b)
Carbon dioxide
c)
Water
d)
Light
20.
Which is the following is NOT a sign of a chemical change?
a)
Releasing a gas
b)
Releasing bubbles
c)
Changing state
d)
Rearranging atoms
21.
Thermal energy transfers...
a)
From colder to hotter material
b)
From hotter to colder material
c)
by going back and forth
d)
balancing equations
22.

Why is carbon an element and not a compound?

a)

All carbon atoms have the same number of protons.

b)

Carbon bonds easily with oxygen, but not helium

c)

Carbon is found in all living things

23.

Each of the elements in the periodic table has a specific number. What does the number represent?

a)

the half-life

b)

the number of neutrons

c)

the number of protons

24.

Water evaporating from salt-water is what kind of change?

a)

Physical change

b)

Chemical Change

25.

Which process is most effective for separating sodium chloride from a saltwater solution?

a)

filtration

b)

evaporation

c)

magnetic separation

d)

chemical separation

26.

A chemist is looking for an element that reacts similarly to the element lithium (Li). Which would be the best choice?

a)

gold (Au)

b)

neon (Ne)

c)

fluorine (F)

d)

sodium (Na)

27.

Which element has 7 valence electrons?

a)

hydrogen (H)

b)

fluorine (F)

c)

lead (Pb)

28.

If an element has no electrons to share and is stable, what family is it found in?

a)

alkali metals

b)

noble gases

c)

halogens

29.

Which best explains how elements are arranged on the modern periodic table?

a)

Elements are arranged from fewest protons to most protons

b)

Elements are arranged from most protons to fewest protons

c)

Elements are arranged from fewest neutrons to most neutrons

30.

Which best describes a row of elements in the periodic table?

a)

column

b)

family

c)

group

d)

period

31.

In which groups did Mendeleev most likely place highly-reactive elements?

a)

IA and VIIA

b)

IA and VIIIA

c)

IIA and VIIIA

32.

Which shows one example of a physical change and one example of a chemical change?

a)

boiling water and melting wax

b)

rusting iron and baking a cake

c)

dissolving powder and shredding paper

d)

freezing water and burning coal

33.

Which is the best evidence that a chemical change in matter has occurred?

a)

A solid melts

b)

A gas is produced

c)

Matter is destroyed during a chemical reaction

34.

A scientist adds sodium acetate to boiling water until it is all dissolved. Once the solution starts to cool, it becomes solid crystals. Which is evidence that a chemical reaction has taken place?

a)

There is less liquid

b)

There is more mass

c)

A precipitate forms

35.

If a student is chemically combining 4 g of hydrogen with 2 g of oxygen, what will be the mass of the product?

a)

4g

b)

6g

c)

8g

d)

10g

36.

When chemicals react in a closed container, which must be true?

a)

The mass both before and after the reaction is the same

b)

The mass both before and after the reaction is variable

c)

The same number of compounds is present both before and after the reaction

37.

When burning methane gas, which outcome best demonstrates the law of conservation of mass?

a)

CH4 → CO2 + H20

b)

CH4 + O2→ CO2 + 2H20

c)

CH4 + O2 → 2CO2 + 2H20

d)

CH4 + 2O2 → CO2 + 2H20

38.

A water molecule forms when one atom of oxygen combines with two atoms of hydrogen. How many atoms will be present in the molecule that results from the reaction?

a)

1

b)

3

c)

5

d)

6

39.

Which best describes how to balance the chemical equation shown below to support the law of conservation of mass?

Mg + O2 → MgO

a)

Add the coefficient 2 before the Mg on both sides of the equation.

b)

Add the coefficient 2 before the O2on the left side of the equation.

c)

Add the coefficient 2 before the Mg on the left side of the equation.

d)

Add the coefficient 2 before the MgO on the right side of the equation.

40.

If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?

a)

100 grams

b)

104 grams

c)

105 grams

d)

110 grams

41.

Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?

a)

Mg + HC1 yields H2 + MgCl2

b)

H20 +CO2 yields H2CO3

c)

KClO3 yields KCl + 02

42.

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

a)

During a chemical reaction, the total amount of matter stays the same.

b)

During a chemical reaction, matter is destroyed.

c)

During a chemical reaction, one or more new substances are formed.

43.

What best explains the result of substances of a chemical reaction?

a)

A new substance is formed

b)

The same substance is produced

c)

More energy is produced in the substance

44.

Which best represents a balanced equation?

a)

120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide

b)

120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide

c)

120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide

45.

Which products would balance the equation below?

CaCl2 + 2Li →

a)

LiCl + Ca

b)

Li2Cl + Ca

c)

2LiCl + Ca

46.

Which equation satisfies the Law of Conservation of Mass?

a)

C3H8 + O2 → CO2 + H2O

b)

C3H8 + O2 → 3CO2 + 4H2O

c)

C3H8 + 5O2 → 3CO2 + 4H2O

47.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
48.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
49.
What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons?
a)
22
b)
11
c)
34
d)
23
50.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
51.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
52.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
53.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
54.

Which of the following is a physical change?

a)

Dissolving

b)

Rapid release of heat

c)

Fizzing (release of gas)

d)

Rusting

55.

Which of the following is a chemical change

a)

Evaporating

b)

Bending

c)

Melting

d)

Bleaching of pigments

56.

Which of the following is a chemical change

a)

Evaporating

b)

Bending

c)

Melting

d)

Bleaching of pigments

57.

What is a physical property?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

58.

What is a chemical property?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

59.

What is physical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

60.

What is chemical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

61.

All of these might indicate a chemical change has occurred except

a)

An unexpected change in color

b)

Gasses are released resulting in fizzing

c)

Light is emitted

d)

A phase change occures

62.

When you increase the energy by heating a liquid what happens to the motion of the molecules

a)

They slow down

b)

They speed up

c)

Heat doesnt change the motion of the molecules

63.

Which of the following is an indication of chemical change

a)

Melting

b)

Freezing

c)

Burning

d)

Evaporating

64.

Which of the following is a chemical change

a)

Mixing red and blue food dye to make purple silly putty

b)

Mixing blue and yellow paint to make green paint

c)

Mixing a blue liquid with clear gas to create a green liquid

65.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
66.
Law of conservation of mass states that 
a)
matter is created
b)
matter is destroyed
c)
matter is neither created nor destroyed
d)
matter does not change
67.
A physical property can be observed by _________________.
a)
burning the substance
b)
changing the chemical identity of a substance
c)
using the senses
d)
placing the substance in acid
68.
Signs that a chemical change has occurred include
a)
a change in color
b)
the release of bubbles
c)
the production of an odor
d)
all of the above
69.

All the elements on the left side of the periodic table are called..

a)

Metals

b)

Metalloid

c)

Nonmetals

70.
A substance that is made up for one type of atom is called an:
a)
atom
b)
element
c)
compound
d)
mixture
71.
Where on the periodic table are the metalloids found?
a)
Right Side
b)
Along the Zig Zag Line
c)
Right Side
72.
Nonmetals are located in what section of this periodic table?
a)
Blue
b)
Yellow
c)
Pink
73.
In the compound 2H2, the H stands for 
a)
Helium 
b)
Hydrogen
c)
Herculineum
74.
CaCo3
a)
Element
b)
Compound
75.
H2O
a)
Element
b)
Compound
76.
Where are electrons of an atom found?
a)
Nucleus
b)
Electron Cloud
c)
Some are in the nucleus and some in the electron cloud.
d)
They are moving everywhere.
77.
Density is...
a)
the amount of mass in an object
b)
the amount of space an object takes up
c)
the amount of mass in a given space
d)
the weight of an object
78.
How would you write -5.6 x 10-3 in standard form?
a)
0.0056
b)
-5,600
c)
0.00056
d)
-0.0056
79.
The unit cm3 is used to express 
a)
 length.
b)
mass.
c)
volume. 
d)
time.
80.
The SI base units for time and temperature are
a)
hour and degree Celsius.
b)
second and degree Celsius.
c)
hour and kelvin.
d)
second and kelvin.
81.
Which of these statements about density is true?
a)
Density is proportional to the amount of a substance.
b)
Density is expressed in units of mL/cm3.
c)
Density does not change with temperature. 
d)
Density may be used to help identify a material.
82.
The measurement 0.0265 g, rounded off to two significant figures, would be
a)
0.026 g. 
b)
0.027 g.
c)
0.03 g.
d)
0.030 g.
83.
a)
31 mL
b)
30 mL
c)
32 mL
d)
29 mL
84.
a)
270 g
b)
272.0 g
c)
272.1 g
d)
270.21 g
85.
refers to the closeness of measurements to the correct or accepted value of the quantity measured
a)
precision
b)
accuracy
86.
A mixture can be separated by ________ means. 
a)
physical
b)
chemical
87.
Salt Water 
a)
Compound 
b)
Mixture 
88.
Chalk and Vinegar 
a)
Compound 
b)
Mixture 
89.
If the number of electrons in an element changes, a new element is formed 
a)
True 
b)
False 
90.
These are the two particles located inside the nucleus of an atom 
a)
Protons and Electrons 
b)
Protons and Neutrons 
c)
Electrons and Neutrons 
d)
Neutrons and Molecules 
91.
If I mix 8 grams of kool-aid powder with 82 grams of water, how much will the resulting kool-aid drink weigh? 
a)
A little more than 82 grams 
b)
74 grams 
c)
90 grams 
d)
82 grams 
92.
How many MOLECULES are in the following compound:  CaCO3
a)
1
b)
3
c)
5
d)
0
93.
How many ATOMS are in the following compound:  C2H4O2
a)
3
b)
8
c)
1
d)
6
94.

How do you make a mixture?

a)

By combining 2 or more substances.

b)

By pouring lots of one substance into a cup.

c)

By stirring water

95.

What do you call the red particles in this mixture?

a)

Solvent

b)

Solute

c)

Solution

96.

What do you call the blue substance in this mixture?

a)

Solvent

b)

Solute

c)

Solution

97.

What is a heterogenous mixture?

a)

A combination of two or more substances where you can see the different parts.

b)

A combination of two or more susbtances where you cannot see the different parts.

c)

A single substance that you stir.

98.

Which of these are homogenous mixtures?

a)
b)
c)
d)
99.

Which statement best describes an effect of the low density of frozen water in a lake?

a)

When water freezes, it contracts, decreasing the water level in a lake.

b)

Water in a lake freezes from the bottom up, killing most aquatic organisms.

c)

When water in a lake freezes, it floats, providing insulation for organisms below.

d)

Water removes thermal energy from the land around a lake, causing the lake to freeze.

100.

Which statement correctly describes how carbon’s ability to form four bonds makes it uniquely suited to form macromolecules?

a)

It forms short, simple carbon chains.

b)

It forms large, complex, diverse molecules.

c)

It forms covalent bonds with other carbon atoms.

d)

It forms covalent bonds that can exist in a single plane.

101.

Describe how the structures of proteins differ from the structures of carbohydrates.

a)

Carbohydrates have various structures for different functions just like proteins.

b)

Proteins are made from long amino acid chains and carbohydrates are made from simple sugars.

c)

No difference.

d)

Proteins have 3 parts and are made up of nitrogenous bases.

102.
Brittleness is _________
a)
the capability of being broken.
b)
the capability of being bent.
c)
the capability of being stretched.
d)
the capability of being molded.
103.
Luster is ___________
a)
A.  the way light is reflected off a surface.
b)
A.  how well a piece of matter conducts electricity. 
c)
A.  the capability of being drawn out into thin wires or threads.
d)
A.  the capability of being hammered out thin.
104.
Metalloids _____________
a)
have no properties of metals.
b)
have no properties of nonmetals.
c)
have some properties of both metals and nonmetals.
d)
none of the above
105.
Describes if a substance is likely to break, snap, or crack 
a)
Dull
b)
Malleable
c)
Brittle
d)
Ductile
106.
_____ - how well it allows electricity to move through.
a)
Ductility
b)
Luster
c)
Malleability
d)
Conductivity
107.
How many valence electrons in group 14?
a)
14
b)
4
c)
5
d)
30

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