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1) Which is an example of a solution?
A) air
B) oxygen
C) salt
D) water
2) One difference between mixtures and pure substances is that
A) mixtures can be physically separated.
B) mixtures are made of one type of atom.
C) pure substances have no chemical bonds.
D) pure substances can be physically separated.
3) When two or more substances combine, but each keeps its own properties, the new combination is called
a(an)
A) Element
B) Mixture
C) Compound
D) Homogeneous substance
4)
CO2
NaCl
HCl
These may all be classified as
A) elements and compounds.
B) elements and molecules.
C) elements and pure substances.
D) compounds and pure substances.
5) Which is an example of an element?
A) salt
B) water
C) silver
D) electron
6) Which material is a pure substance?
A) alloy
B) compound
C) mixture
D) solution
7)
Water is formed when two hydrogen atoms bond to an oxygen atom.
B)
C)
D)
The hydrogen and the oxygen in this example are different
A) complexes.
compounds.
elements.
mixtures.
8) Which of these is not considered a pure substance?
A) An atom
B) A mixture
C) An element
D) A compound
9) Which of these could be separated by distillation or filtration?
A) An atom
B) A mixture
C) An element
D) A compound
10)
boiling point
density
conductivity
color
These may all be classified as the ______________ of a substance.
A) nuclear properties
B) physical properties
C) chemical properties
D) reactive properties
11) Which is an example of a chemical reaction?
A) melting ice
B) rusting iron
C) water evaporating
D) rubbing a marker on paper
12)
Reduce, reuse, recycle! Soft drinks come in aluminum cans that are readily recycled. Storage of empty cans is
never a problem, since aluminum cans are easily crushed because they are very
A) conductive.
B) magnetic.
C) malleable.
D) soluble.
13)
During science lab, some students added small pieces of magnesium ribbon to 10 mL of hydrochloric acid.
They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared.
Which is a sign that a chemical reaction has taken place in this experiment?
A) change in odor
B) change in color
C) release of heat energy
D) disappearance of magnesium
14)
Common Metals
Name Melting Point Density (g/cm3)
Zinc
419.53 oC
7.134
Nickel
1455oC
8.912
Copper
1084.62oC
8.96
Silver
961.78oC
10.501
Gold
1064.18oC
19.282
You are hired as a scrap metal dealer. A customer wants to sell you a piece of precious scrap metal. You know
it is one of these common metals. The metal has a low density and low melting point. What is the metal?
A) Copper
B) Gold
C) Nickel
D) Zinc
15) Which property is an example of a chemical property?
A) the ability to burn
B) the ability to melt
C) the ability to dissolve
D) the ability to evaporate
16) During a physical science lab investigating chemical reactions, several students placed an antacid tablet in
a zip-lock bag. They recorded the mass of the tablet, 30 grams, and the bag, 60 grams. Then they added 50
grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled
with gas. If the mass of the liquid after the reaction is completed is still 50 grams, how much gas is produced?
A) 30 grams
B) 50 grams
C) 80 grams
D) 90 grams
17) Which piece of lab equipment has specific markings for highly accurate measurements of liquid volumes?
A) beaker
B) test tube
C) watch glass
D) graduated cylinder
18) Which safety precaution is common to ALL laboratory activities?
A) Wear a lab apron.
B) Follow Instructions.
C) Disinfection of the lab bench.
D) Disposal of materials into hazardous waste containers.
19) Fill in the following blanks
Every form of matter has two kinds of properties ___________ and ______________.
20) Damp soil is an example of an..
a. homogeneous mixture
b. solution
c. heterogeneous mixture
d. compound
21) The SI unit for mass is which of the following?
a. grams
b. kilograms
c. newtons
d. weight
22) Calculate density
A small wooden block of wood floats on water. It has a mass of 200grams and a volume of 250 cm3.
What is the density of the wood?
a. .080 grams/ml
b. .80 grams
c. 1.80 grams/cm3
d. .80 grams/cm3
23) __________ energy is the energy of motion.
a. potential
b. electromagnetic.
c. kinetic
d. resting
24) chemical energy is the potential energy of
a. temperature
b. bonds between atoms
c. electricity
d. light
25) Which of these statements are false?
a. elements are pure substances
b. atoms of different elements can combine to form compounds
c. atoms of different elements are the same
d. Fe and Cu are examples of elements
26) What holds atoms together?
a. gravity
b. density
c. chemical bonds
d. physical bonds
27) The ability to do work or cause change is _______
a. density
b. temperature
c. energy
d. matter
28) SO4, H2O, and C4H8O10 are examples of chemical
a. properties
b. bonds
c. changes
d. formulas
29) Which of the following is not a physical property of matter?
a. color
b. size
c. ductility
d. reactivity to water
30) Which of the following is another name for a homogeneous mixture
a. liquid
b. solution
c. suspension
d. colloid
31) Consider Ag as being a very dense material, which would you rather carry around with you in school,
a kilogram of Ag or a kilogram of papers?
a. paper, because you backpack would feel lighter
b. Ag, because you backpack would feel lighter
c. paper, because it they would take up less space in your backpack
d. Ag, because it would take up less space in your backpack