Name
Ch. 2 Questions – Properties of matter
1)
Which of the following are pure substances?
A) solutions
B) compounds
2)
Which of the following is NOT a pure substance?
A) milk
B) oxygen
C) water
D) carbon dioxide
Which of the following is a mixture?
A) carbon dioxide
B) silicon
D) sand
3)
C) homogeneous mixtures
C) silicon dioxide
4)
Which of the following is a heterogeneous mixture?
A) water in a swimming pool B) sugar water
5)
A mixture that appears to contain only one substance is a(n)
A) homogenous mixture
B) heterogeneous mixture
6)
D) Colloids
C) a jar of mixed nuts
D) stainless steel
C) compound
D) element
Fill in the chart below that demonstrates how matter can be classified.
Matter
Pure substance
Elements
Compounds
Mixture
Homogeneous
Solution
7)
8)
Heterogeneous
Colloid
Suspension
What is the difference between elements and compounds?
Elements cannot be broken down into simpler substances and contains only one kind of atom (ex: Carbon - C,
Oxygen - O)
Compounds contain a combination of elements or other compounds that are chemically combined and can be
broken down into simpler substances (ex: Carbon dioxide - CO2, Water - H2O)
Identify each as either an element or compound.
a) Water Compound
b) Oxygen Element
c) Ammonia Compound
d) Sulfur Element
e) Carbon dioxide Compound
f) Carbon monoxide Compound
g) Sugar Compound
h) Salt Compound
i) Nickel Element
9)
What is the difference between a heterogeneous mixture and homogeneous mixture?
Heterogeneous mixture – The parts of the mixture are noticeably different from one another.
Homogeneous mixture – The substances within this mixture are so evenly distributed it is difficult to distinguish
one substance from another.
10) Classify the following as heterogeneous mixture, homogeneous mixture, compound, or element.
a) 10-karat gold Homogeneous
b) neon Element
c) fog Homogeneous
d) salad dressing Heterogeneous
e) salt Compound
f) salt water Homogeneous
g) soda pop Homogeneous
h) sand Heterogeneous
i) steel Homogeneous
Ch. 2 questions
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11) Classify the following as physical (P) or chemical (C) properties of water.
A) density = 1.00 g/ml __P___________
D) is colorless___P__________
B) forms ice at 0 °C __P___________
E) is formed when wood is burned__C_____
C) makes hydrogen gas when combined with sodium metal ____C___________
12) A sample of copper can be drawn into a thin wire. Is this property of copper a physical or a chemical property?
Physical property – drawing copper into a thin wire does not alter the chemical composition of copper
13) Name one physical property and one chemical property of wood.
Chemical property = wood’s flammable Physical property = wood is a poor conductor
14) Suppose you need to identify the material in an object without changing the object in any way. Should you use
physical or chemical properties to identify the material? Explain your choice.
A physical property – observing an object’s physical properties does not change the chemical composition of the
substance in any way (by definition of physical properties) and thus does not alter the substance in any way.
15) Suppose you mix two colorless liquids together and a green solid settles to the bottom of the container. Explain
why you might be confident that a chemical change has taken place.
There are two clues that suggest a chemical change has occurred – 1) the color of the substance changed (to
green) 2) A solid (or precipitate) was left behind.
16) During which of these events does a chemical change occur?
a) ice cubes melt
b) a pot of water boils
c) a heated iron bar turns red
d) a paper clip is bent
e) a cake rises in the oven
Use the drawing to answer questions 17 and 18.
17)
Which of the drawings could represent a homogeneous mixture?
a) drawing l
b) drawing ll
c) drawing lll
d) drawing l and lll
18) Which of the drawings could represent an element?
a) drawing l
b) drawing ll
c) drawing lll
d) drawing l and lll
e) drawing ll and lll
e) drawing ll and lll
19) When a physical change in a sample occurs, which of the following does NOT change?
a) shape
b) temperature
c) volume
d) composition
20) Which of the following is NOT a clue that a chemical change has occurred?
a) change in color
b) production of a gas c) formation of a precipitate
d) changes in shape
21) Which of the following is a clue of a chemical change?
a) ice melting b) ice being carved c) water boiling d) water breaking down into hydrogen and helium
22) identify each of the following changes as chemical or physical
a) Freezing of water Physical
b) Burning wood Chemical
c) Rusting of a nail Chemical
d) Dissolving salt in water Physical
e) Putting paint on wood Physical
f) Melting butter for popcorn Phys.
g) Frying an egg Chemical
h) Baking a cake Chemical
j) Tearing a piece of paper Phys.
k) Healing of a wound Chemical
i) Hammering wood together to build
a playhouse Physical
l) Digesting an apple Chemical
m) Making a volcano with baking soda
and vinegar Chemical
p) Bleaching your hair Chemical
n) Smashing a watermelon Physical
o) Waxing a wooden floor Physical
Q) Burning toast Chemical
r) Fireworks exploding Chemical
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Ch. 2 questions
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