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WorksheetsTest 5 review
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
A self-warming packet can be used to warm hands during cold weather. Powdered iron (Fe) reacts with oxygen (O2) when the packet is exposed to air. With the addition of a salt catalyst, Fe2O3 (iron oxide) is quickly formed and heat is given off.
Which term best describes iron oxide?
Which term best describes iron oxide?
a)
compound
b)
mixture
c)
element
d)
ion
2.
What do any two samples of the element mercury (Hg) have in common?
a)
same mass
b)
same volume
c)
same type of atom
d)
same number of electrons
3.
A student mixes salt and water in a beaker to form a solution. What properties of the substances would allow the student to then separate the components?
a)
desnities
b)
particle size
c)
boiling point
d)
electrical conductivity
4.
In the reaction, iron reacts with water to form iron oxide and hydrogen gas
Which of these best describes the iron (Fe) reactant?
Which of these best describes the iron (Fe) reactant?
a)
element
b)
compound
c)
ion
d)
mixture
5.
A student observes a substance that is highly reflective and able to conduct electricity. The substance also has a high melting point. Which is the most likely classification for this substance?
a)
salt
b)
glass
c)
metal
d)
plastic
6.
Which can be broken down chemically into simpler substances?
a)
atom
b)
isotope
c)
compound
d)
element
7.
When water evaporates from Earth’s surface into the atmosphere, its molecules enter the gas state. What change in this gas causes molecules to condense into the small water droplets that form clouds?
a)
mass is reduced
b)
volume is increased
c)
temperature is reduced
d)
pressure is increased
8.
A sample in a cylindrical container has a cylindrical shape and a fixed volume. The state of matter of the sample
a)
must be solid.
b)
could be either solid or liquid.
c)
must be liquid
d)
could be either liquid or gas
9.
Energy is absorbed and released through endothermic and exothermic processes. Which is an example of an exothermic process? ( Hint: Heat exits )
a)
ice melting
b)
ice sublimating
c)
water evaporating
d)
water freezing
10.
Water puddles on a sidewalk evaporate when the Sun heats the water. Which of these best describes what is happening as the water evaporates?
a)
Water changes phase as it releases heat to the environment.
b)
Water boils as it absorbs energy from the sidewalk
c)
Water becomes a gas as it absorbs energy from the Sun.
d)
Water evaporates as its thermal energy is transferred to the air
11.
Which of the following is a chemical property of a substance?
a)
mass of 372 g
b)
reacts with HCl
c)
density of 37 g/
d)
white powder with silver specks
12.
Which change in the state of water particles causes the particles to become arranged in a fixed position?
a)
boiling
b)
melting
c)
freezing
d)
evaporating
13.
Why are alloys of metals used for more applications than pure metallic elements?
a)
Alloys are generally stronger and less reactive.
b)
Most metals cannot be found naturally in pure form
c)
Alloys generally cost less to produce than pure metals
d)
Alloys are generally softer and easier to work than pure elements.
14.
A student describes a substance as lacking a definite shape. The description also states that the particles of matter are close to each other but still able to flow past each other. Which type of substance is the student mostlikely describing?
a)
solid
b)
liquid
c)
mixture
d)
compound
15.
A student observed a sample of water in three states of matter. The student should describe the liquid water as a state of matter that has
a)
more kinetic energy than the solid state.
b)
more mass than the solid state.
c)
less kinetic energy than the solid state
d)
less volume than the solid state.
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