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PS Benchmark #3 Review
Test Description: Review for Benchmark #3
Instructions: Answer all questions to get your test result.
1) If an atom is neutral, the number of protons is equal to the number of
A
electrons
B
positrons
C
quarks
D
neutrons
2) Melting candle wax is a ________________ change.
A
chemical
B
easy
C
irreversible
D
physical
3) A red rose will look red because it
A
absorbs red light
B
it just is that color
C
reflects red light
D
mixes light
4) Which elements are most similar
A
Br and Kr
B
Na and H
C
Ba and Cl
D
Ar and Kr
5) What force holds the nucleus of an atom together?
A
electromagnetic force
B
gravity
C
weak force
D
strong force
6) How many atoms are in the compound CH4?
A
3
B
5
C
none
D
2
7) Which of the following is a mixture
A
tank of helium
B
calcium tablets
C
steel pipe
D
iron shavings
8) All group 18 elements are called __________________
A
Noble gases
B
Transition elements
C
Alkali metals
D
Alkaline Earth metals
9) What is the density of a gas with a volume of 5 mL and a mass of 25 g?
A
0.2 g/mL
B
5 g/mL
C
5 kg/L
D
0.15 g/mL
10) Who developed the concept of buoyant force?
A
Einstein
B
Newton
C
Archimedes
D
Galileo
11) What happens to the particles (in terms of speed) when a substance is heated?
A
They slow down
B
They are unaffected
C
They speed up
D
You cannot add heat to the particles
12) What do you call a group of charged particles that move together as one thing?
A
Polyatomic Ion
B
Monatomic Ion
C
Molecule
D
Atoms
13) How many neutrons does Carbon have?
A
7
B
8
C
6
D
12
14) What category of elements contain properties of metals and nonmetals?
A
Metalloids
B
Noble gases
C
Transition metals
D
Groups 1 and 2
15) Which solid type has atoms that are arranged in repeating patterns?
A
Hard solids
B
Amorphous
C
Crystalline
D
Liquids
16) What is the result of physically combining substances so that each substance maintains its chemical properties?
A
Mixture
B
Compound
C
Atom
D
Element
17) What is the upward force acting on a compound in a fluid?
A
Gravity
B
Buoyancy
C
Floating
D
Weight
18) Milk souring is an example of a ___________________ change.
A
Nasty
B
Color
C
Physical
D
Chemical
19) Chlorine has _________________ neutrons.
A
17
B
0
C
35
D
18
20) The atomic number of an atom is always equal to the number of what subatomic particle?
A
Proton
B
Electron
C
Quark
D
Neutron
*select an answer for all questions
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