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WorksheetsChem Review Sam
Total questions: 61
Worksheet time: 2hrs 48mins
Name
Class
Date
1.
Which of these determines the identity of an element?
a)
number of electrons
b)
number of protons
c)
number of energy levels
d)
number of neutrons
2.
What is formed when two or more elements are chemically combined?
a)
atom
b)
composite
c)
compound
d)
mixture
3.
Elements are described as pure substances because
a)
they are found in nature.
b)
they cannot be separated into parts by physical means.
c)
they have no charge.
d)
they can be produced in a laboratory.
4.
The nucleus of an atom contains
a)
only neutrons
b)
protons and electrons
c)
protons and neutrons
d)
only electrons
5.
Carbon and oxygen combine chemically to form carbon dioxide. Carbon dioxide is
a)
an ion
b)
a nucleus
c)
a compound
d)
an atom
6.
Which of these is not made up of two or more substances that are combined physically?
a)
homogeneous mixture
b)
compound
c)
heterogeneous mixture
d)
solution
7.
Filtration can be used to separate a mixture of
a)
a solid and a liquid
b)
a liquid and a gas
c)
two liquids
d)
two solids
8.
Which of these processes would be useful for separating a dissolved solid from a liquid?
a)
evaporation
b)
filtration
c)
sifting
d)
mixing
9.
Sodium is an element found in table salt. It contains 11 protons and 12 neutrons. How many electrons are found in a neutral atom of sodium?
a)
23
b)
12
c)
11
d)
1
10.
How are the elements in the modern periodic table arranged?
a)
alphabetical order
b)
by atomic mass
c)
by date discovery
d)
by number of protons
11.
Which elements in the periodic table are least likely to combine with other elements?
a)
halogens
b)
noble gases
c)
alkaline earths
d)
transition metals
12.
What happens during a physical change?
a)
New substances form.
b)
The identity of a substance is changed.
c)
A chemical reaction occurs.
d)
A property of a substance changes, but its identity stays the same.
13.
Which of the following is a chemical change?
a)
water freezing
b)
paper being torn
c)
cake baking
d)
ice melting
14.
A physical change is taking place when
a)
a nail rusts.
b)
onions are chopped.
c)
a piece of apple rots.
d)
a piece of paper burns.
15.
Which of the following would cause a chemical change in a piece of wood?
a)
hammering a nail into the wood
b)
burning the wood
c)
painting the wood
d)
sawing the piece of wood in half
16.
Which is a clue that a chemical change has occurred?
a)
A beaker becomes warm when you mix two room temperature liquids in it.
b)
A liquid forms bubbles when it reaches a high temperature.
c)
Water changes color when food coloring is added.
d)
A car door feels hot when touched in summer.
17.
When substances combine to form a mixture, they
a)
keep their original properties.
b)
form new chemical bonds.
c)
form a new compound.
d)
cannot be separated physically.
18.
Elements in the same column of the periodic table have
a)
similar chemical properties
b)
the same number of protons
c)
similar atomic masses
d)
atoms of the same size
19.
Which of these is a physical change?
a)
forming a precipitate
b)
rusting
c)
burning
d)
melting
20.
Which is always true of a balanced chemical equation?
a)
Coefficients on both sides of the equation are multiples of 2.
b)
The subscripts on one side of the equation = The subscripts on the other side.
c)
The number of atoms are the same on both sides.
d)
Both sides of an equation contain the same elements and the same number of atoms.
21.
Which of the following statements about elements is false?
a)
An element is a pure substance.
b)
An element is made up of compounds.
c)
An element is represented by a chemical symbol.
d)
Each element has its own atomic number.
22.
Which of these is not evidence that a chemical change may have taken place?
a)
release of heat
b)
formation of precipitate
c)
change in shape
d)
change in color
23.
Which term describes the substance that forms when two or more types of atoms join?
a)
element
b)
composite
c)
compound
d)
mixture
24.
Which shows an example of physical and then chemical change?
a)
dissolving sugar and grinding pepper
b)
melting butter and mixing flour with salt
c)
roasting meat and freezing leftovers
d)
boiling water and burning gasoline
25.
If a chemical reaction such as the formation of Iron oxide contains 4 atoms of iron (Fe) in the product, how many atoms of iron (Fe) would be in the reactants?
a)
12 atoms of iron (Fe)
b)
8 atoms of iron (Fe)
c)
4 atoms of iron (Fe)
d)
2 atoms of iron (Fe)
26.
Which is an example of a physical change?
a)
metal tarnishing
b)
nail rusting
c)
formation of precipitate
d)
dissolving sugar in water
27.
Which is the best example of a mixture?
a)
a brick of pure gold
b)
the distilled water in a bottle
c)
the salt water in the ocean
d)
the helium in a balloon
28.
Which best describes a chemical change?
a)
A chemical change required no change in energy.
b)
A chemical change is easily reversed.
c)
In a chemical change, there is only a change in state.
d)
In a chemical change, a new substance is formed.
29.
The atomic number of oxygen (O) is 8. How many protons does one oxygen atom contain?
a)
16 protons
b)
12 protons
c)
8 protons
d)
4 protons
30.
Which of these elements has chemical properties most similar to that of Carbon (C)
a)
Boron
b)
Magnesium
c)
Oxygen
d)
Silicon
31.
Magnesium (Mg) is immediately to the right of Sodium (Na) on the periodic table. In what way is Magnesium atom different from a Sodium atom?
a)
The number of protons is increased by one.
b)
The number of neutrons is increased by two.
c)
The atomic mass is increased by one.
d)
The number of electrons is increased by two.
32.
Which is the best example of a pure substance?
a)
peanuts
b)
milk
c)
gold
d)
air
33.
Which statement best explains how periods in the Periodic Table are organized?
a)
increasing atomic number from left to right
b)
increasing number of neutrons from left to right
c)
decreasing number of electrons from left to right
d)
decreasing atomic mass number from left to right
34.
An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?
a)
The molecules will begin to move slower.
b)
The molecules will begin to move faster.
c)
The molecules will begin to increase in density.
d)
The molecules will begin to condense in the air.
35.
Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
a)
A physical change occurred.
b)
Atoms involved in the reaction lost mass.
c)
Precipitates were created in the new solution.
d)
Gases were released to the atmosphere.
36.
Why is water classified as a compound?
a)
Because it is an element, which consists of only one type of atom.
b)
Because it is a substance, which can easily be separated.
c)
Because it is a substance composed of two or more kinds of atoms bonded together.
d)
Because it is an unevenly mixed solution, or a heterogeneous mixture.
37.
A student is designing an experiment for the science fair. She needs to find a material that conducts an electric current, and her teacher has provided her with samples of the following elements. Which of them should she choose?
a)
argon
b)
copper
c)
fluorine
d)
phosphorous
38.
The mass of the products in a chemical reaction is the same as the mass of the reactants in the reaction. Which law best describes this statement?
a)
The Law of Conservation of Angular Momentum
b)
The Law of Superposition
c)
The Law of Conservation of Matter
d)
The Law of Entropy
39.
Which is an example of a chemical reaction?
a)
a pot of water boiling
b)
an iron nail rusting
c)
a piece of ice melting
d)
a sugar cube dissolving in tea
40.
A scientist recognizes a white powder as sugar due to its white crystals and its sweet taste. However, the scientist notices that the elements that make up the sugar - carbon, hydrogen, and oxygen - look nothing like sugar, nor are they sweet. What is the best explanation for this?
a)
Sugar is a compound, and compounds usually have a different appear
b)
Sugar is an element, so its properties are unique.
c)
Sugar is a heterogeneous mixture, so its appearance is unique.
d)
Substances in nature change randomly and it is impossible to predict those changes.
41.
Chemical X has a mass of 5 grams, and chemical Y has a mass of 10 grams. If the two chemicals are mixed and a complete chemical reaction takes place, what is MOST LIKELY the mass of the product?
a)
5 grams
b)
10 grams
c)
15 grams
d)
50 grams
42.
How can a scientist, using the periodic table, find an element with properties similar to another element?
a)
by comparing density
b)
by finding its periodic group
c)
by comparing malleability
d)
by comparing atomic weight
43.
Which is an example of a physical change?
a)
boiling
b)
burning
c)
rotting
d)
rusting
44.
What characteristic of aluminum allows it to be made into aluminum foil?
a)
It is dense.
b)
It is soluble.
c)
It is magnetic.
d)
It is malleable.
45.
Which pure substance is composed of more than one element?
a)
water
b)
carbon
c)
gold
d)
sodium
46.
After a chemical reaction occurs in an open test tube, measurements indicate that the mass of the reactants is greater than the mass of the products remaining in the test tube. What MOST LIKELY explains the measurements?
a)
A gas was produced.
b)
A solid was produced.
c)
The salinity of the reactants was high.
d)
The temperature of the reactants was low.
47.
Atoms of the same element must -
a)
contain the same number of neutrons
b)
have the same mass number
c)
contain the same number of protons
d)
have equal numbers of protons and neutrons
48.
An increase in atomic number is related to an increase in atomic mass because -
a)
more electrons are present in the atomic nucleus
b)
more electrons are orbiting the atomic nucleus
c)
more protons are present in the atomic nucleus
d)
more protons are orbiting the atomic nucleus
49.
Which is NOT an example of matter?
a)
water
b)
air
c)
gold
d)
sound
50.
A chemical change always -
a)
forms one or more new substances
b)
absorbs heat
c)
releases heat
d)
absorbs electricity
51.
On the periodic table, where are the MOST reactive metals located?
a)
Group 1
b)
Group 2
c)
Group 17
d)
Group 18
52.
Which of the following has a negative charge?
a)
electron
b)
proton
c)
neutron
d)
nucleus
53.
Which observation would BEST support the conclusion that a chemical reaction took place?
a)
a precipitate was formed
b)
liquid water disappeared
c)
a substance dissolved
d)
solid ice melts
54.
Table sugar, also called glucose, has a formula C6H12O6. What other term could be used to describe glucose?
a)
chemical
b)
element
c)
proton
d)
mixture
55.
Atoms of elements in period 4 are larger than atoms of elements in period 1. What piece of evidence best supports this statement?
a)
atomic number
b)
atomic symbol
c)
chemical nomenclature
d)
elemental group
56.
Which of the following cannot be found on the periodic table?
a)
aluminum chloride
b)
nitrogen
c)
titanium
d)
magnesium
57.
How many neutrons does flourine have?
a)
9
b)
19
c)
28
d)
10
58.
Where will you most likely find any one of the elements on the Periodic Table with an atomic number greater than 112?
a)
naturally on earth
b)
only in the lab
c)
naturally in space
d)
only inside animals
59.
Elements found in Group 18 are called noble gases. They are considered relatively stable elements. What trait of an element would allow it to be placed in Group 18?
a)
number of protons greater than 90
b)
neutrons in equal number to the number of protons
c)
low chemical reactivity due to full valence electrons
d)
radioactivity with a half-life greater than 36 days
60.
Which state of matter zips and zooms in any direction filling the entire container?
a)
gas
b)
liquid
c)
solid
d)
metal
61.
A student is asked to categorize the following items as elements, compounds, or mixtures: copper wire, salt, aluminum foil, baking soda, a piece of granite, and sugar water. He lists ELEMENTS as copper wire, aluminum foil, and baking soda; COMPOUNDS as salt; MIXTURES as the piece of granite and sugar water. Which is in the wrong category?
a)
copper wire
b)
sugar water
c)
baking soda
d)
salt
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