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Matter, Elements, and Compounds
Matter, Elements, and Compounds
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6th Grade Science: Matter, Elements, Compounds Units 1-4 Review
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Answers
1
The chemical symbol for nitrogen is —
Ne
Na
N
Ni
2
Metalloids such as boron and arsenic tend to be —
good semiconductors.
poor semiconductors.
poor semiconductors only when they are mixed with metals.
good semiconductors only when they are mixed with nonmetals.
3
What conclusion can be made after observing fizzing and bubbling?
A chemical reaction produced a gas.
No chemical reaction took place.
Only a physical change happened.
A chemical reaction produced a solid.
4
Which of the following is true about metals?
They are usually more brittle than metalloids.
They are usually less reflective in luster than metalloids.
They are usually less malleable than nonmetals.
They are usually better conductors than nonmetals.
5
What would be a good title for the following list: Luster, Ductile, Conductivity, Malleability
Reactive Properties
Observable Properties
Physical Properties
Chemical Properties
6
How many different elements make up this compound: COFeHNCo
6
9
10
11
7
The volume of a key is 5 mL and the mass is 39.5 g. What is the density?
7.90 g/mL3
19.30 g/mL3
2.70 g/mL3
8.90 g/mL3
8
Jo uses a battery, wire and bulb to try and complete a circuit. What physical property is this?
Streak
Luster
Conductivity
Hardness
9
Metalloids such as silicon and boron —
always have a metallic luster and are malleable.
are all brittle and ductile.
may contain characteristics of metals and nonmetals.
always conduct electricity.
10
Which of the following is a chemical property associated with wood?
ability to burn
having a rough surface
floating on water
snapping when bent
11
The ability of a substance to be molded and shaped or hammered into sheets without breaking is
luster
malleability
ductility
conductivity
12
How the surface of a mineral appears when it reflects light is known as ―
hardness
streak
luster
conductivity
13
What is the best procedure for disposing of unknown chemicals?
Pour the chemicals down the drain.
Pour the chemicals back into the original containers.
Follow the teacher's instructions for disposal.
Throw the chemicals in the trash can.
14
The chemical symbol Ca represents —
calcium
chlorine
carbon
cesium
15
Which of the following properties is characteristic of a metal?
floats in water
silver-gray color
transparent
poor conductor
16
The capability of a substance to be stretched into thin wires without breaking is known as —
ductility
conductivity
malleability
luster
17
A chemical change is:
reversible.
a temperature change.
permanent.
a phase change.
18
Which is the best evidence that a change in chemical properties has taken place?
Melting
Color Change
Change in size
Temperature change
19
The mass is 105 grams. The volume is shown below. What is the density?
3.3 g/mL
.33 g/mL
3500 g/mL
3.0 g/mL
20
Nonmetals tend to conduct heat poorly. Metalloids tend to —
conduct heat well.
not conduct heat.
conduct heat poorly.
vary as to how well they conduct heat.
21
The volume of a cube is 3cm
3
and the mass is 12 grams. What is the density?
36 g/cm3
2.25 g/cm3
0.4 g/cm3
4.0 g/cm3
22
According to the table, most mass of living organisms is made up of which two elements?
Oxygen and carbon
Hydrogen and Oxygen
Nitrogen and Others
Oxygen and Nitrogen
23
What physical property do you scratch a tile for?
Hardness
Streak
Conductivity
Color
24
What safety equipment is most vital during an investigation involving a chemical reaction?
Safety goggles
Beaker tongs
Fire extinguisher
Latex gloves
25
Which of the following substances is an element?
KF
Co
CO2
NaS
26
Which of the following is the symbol for chlorine?
Ce
C
Cl
Ch
27
Which of the following is a compound?
CO
H
Co
Fe
28
Most metals such as nickel and tin tend to melt at —
high temperatures.
temperatures close to room temperature.
low temperatures.
temperatures below zero degrees Celsius.
