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LESSON 25
IDENTIFYING CHEMICALS
1
Which of the following is a
definition of an element?
a. An element is a natural substance that
can be used to build matter
b. An element is a substance that cannot
be easily changed into another
substance.
c. An element is a substance that can be
found only in mixtures
d. An element is a substance that can be
made only by humans
2
Which of the following is a
synthetic chemical?
a. Water
b. Salt
c. Oxygen
d. Pesticides
3
Which of the following is a synthetic
element?
a. C
b. Ca
c. Al
d. Pu
4
Which of the following is an
element?
a. NaCl
b. HF
c. He
d. KBr
5
Which of the following is a
compound, not a mixture?
a. Air
b. Container of sand, salt and charcoal
c. Trail mix
d. Table salt
6
Which of the following represents a
mixture?
a. A piece of copper wire
b. The oxygen gas in a pressurized tank
c. A slice of mushroom pizza
d. A lead fishing weight
7
LESSON 26
ELEMENTS FORM COMPOUNDS
8
Which of the following can be broken down
into simpler substances?
a. H
b. Na
c. Cl
d. NaCl
9
Which of the following shows a chemical
formula with 4 oxygen atoms?
a. NaOH
b. C6H12O6
c. H2O
d. KMnO4
10
The smallest unit of an element that has all
the properties of the element is called what?
a. Atom
b. Element
c. Compound
d. Cell
11
Which atomic particle is correctly
matched with its charge?
a. Proton; negative
b. Electron; positive
c. Neutron; negative
d. Electron; negative
12
Which atomic particle is correctly
matched with its location?
a. Proton; orbits the nucleus
b. Neutron; orbits the nucleus
c. Electron; in the nucleus
d. Proton; in the nucleus
13
Which of the following contain the greatest
number of different elements?
a. NaCl
b. H2O
c. CH4
d. C6H12O6
14
Which of the following shows a
ration of N to O atoms of 1:2?
a. NO
b. NO3
c. NO2
d. CO2
15
Which of the following is correctly arranged
in going from simplest to most complex?
a. Compound
element
a. Atom
element
b. Atom
compound
c. Element
atom
atom
compound
element
compound
16
LESSON 27
THE PERIODIC TABLE
17
An atom has 6 protons, 6 electrons and 8
neutrons. What is its atomic mass?
a. 6
b. 8
c. 12
d. 14
18
A charged atom has 8 protons, 10 electrons
and 9 neutrons. What is its atomic number?
a. 8
b. 9
c. 10
d. 17
19
Which of the following is the basis for
arranging the elements in the periodic table?
a. Alphabetical order
b. Masses of atoms
c. Number of protons
d. Date of discovery
20
How many elements are listed in
the periodic table?
a. 60
b. 72
c. 92
d. More than 100
21
What is the atomic number of He?
a. 1
b. 2
c. 4
d. 18
22
Which element has similar chemical and
physical properties to Cl?
a. O
b. Ne
c. S
d. Br
23
Which element does NOT have
similar properties to K?
a. H
b. Na
c. Fr
d. Ca
24
Which of the following is a
metalloid?
a. Na
b. Zn
c. Cl
d. As
25
Which of the following is a metal?
a. O
b. Si
c. Br
d. K
26
Which of the following is a
nonmetal?
a. Li
b. Ca
c. B
d. N
27
All elements in Group 18 are what?
a. Liquids
b. Solids
c. Metalloids
d. Gases
28
Which element is found in period 2,
group 1?
a. Na
b. Mg
c. Li
d. Be
29
Of the following, which is listed last
on the periodic table?
a. Atomic # 7
b. Oxygen
c. Atomic # 2
d. Helium
30
LESSON 28
PROPERTIES OF MATTER
31
Which of the following is an
example of a chemical property?
a. Density
b. Magnetism
c. Electrical conductivity
d. Chemical reactivity
32
Which of the following is
malleable?
a. Sulfer (S)
b. Aluminum (Al)
c. Bromine (Br)
d. Oxygen (O)
33
Which of the following is NOT
ductile?
a. Iron (Fe)
b. Lead (Pb)
c. Tin (Sn)
d. Neon (Ne)
34
Why is copper used in electrical
wiring?
a. Is has good electrical conductivity
b. It is ductile
c. It is a poor insulator
d. All of the above
35
The formula for density is what?
a. D = V/M (Volume divided by Mass)
b. D = Mass x Volume
c. D = M/V (Mass divided by Volume)
d. D= Length x Width x Height
36
A sample of lead has a mass of 33 grams
and a volume of 3 cubic centimeters. What
is the density of lead?
a. 99 grams/cubic centimeters
b. 33 grams/cubic centimeters
c. 11 grams/cubic centimeters
d. 3 grams/cubic centimeters
37
LESSON 29
IDENTIFYING SUBSTANCES
38
Melting point is a physical property.
What is melting point?
a. The temperature at which the liquid turns
to a solid
b. The temperature at which the solid turns
to a liquid
c. The temperature at which the substance
forms a gas
d. The amount of heat the substance
absorbs
39
LESSON 30
MEASURING PHYSICAL AND CHEMICAL
CHANGES
40
Which of the following is a chemical
change only?
a. Tearing paper
b. Sharpening a pencil
c. Burning paper and pencil
d. Writing with a pencil on paper
41
Which of the following is NOT a possible
sign of a chemical reaction?
a. Formation of a gas
b. Formation of a precipitate
c. Color or temperature change
d. Change in physical appearance
42
Which of the following is an
example of a chemical change?
a. Water evaporating
b. Wood burning
c. Ice cream melting
d. Salt dissolving in water
43
Carbon combines with oxygen to form
carbon dioxide. What is the word equation
for this chemical reaction?
a. Carbon dioxide
carbon + oxygen
b. Carbon
carbon dioxide + oxygen
c. Carbon + oxygen
d. Carbon dioxide + oxygen
carbon dioxide
carbon
44
Which of the following may happen
during a physical change?
a. New substances are formed
b. Reactants form products
c. A precipitate is formed
d. The temperature might increase
45
Identify the product(s) in this chemical
reaction:
Na + Cl
NaCl
a. Sodium (Na)
b. Chlorine (Cl)
c. Salt (NaCl)
46
What does the law of conservation
of matter state?
a. The total mass of the reactants is greater
than the total mass of the products
b. The total mass of the reactants is less
than the total mass of the products
c. The total mass of the reactants equals
the total mass of the products
d. Mass can be created and destroyed
47
The reactants involved in a chemical reaction are shown:
Na2O + 2H2O
How many O atoms must be present in the product that
forms?
a. 1
b. 2
c. 3
d. 4
48
Hydrogen gas can be produced by the following equation:
Mg + 2HCl
MgCl2 + H2
If hydrogen atoms cannot be created, what is the source of
the atoms in the hydrogen gas?
a. Mg
b. HCl
c. Both Mg and HCl
d. Neither Mg nor HCl
49
How many grams of oxygen is required for this reaction to
occur?
2CH4 + 3O2
2CO + 4H2O
16 g
?
44 g
36 g
a. 16
b. 36
c. 44
d. 64
50
What number correctly balances the
following reaction?
N2 + ?O2
2NO2
a. 1
b. 2
c. 3
d. 4
51
What is the mass of rust that forms in this
reaction?
100 g Iron + 43 g Oxygen
? g Rust
a. 43 g
b. 100 g
c. 143 g
d. 286 g
52
Which of the following is an
endothermic change?
a. Paper burning
b. Bomb exploding
c. Ice + energy
d. O2 + glucose
liquid water
CO2 + H2O + energy
53