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Chemistry review
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Science review 8th grade chemistry
Flashcards
28 cards
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Practice quiz
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Questions
28
Answers
1
CaCO
3
is an example of...
coeficient
reactant
subscript
product
2
If neon has an atomic number of 10 and mass number of 20 how many neutrons are there?
10
30
20
3
What unit would you use to measure the length of a pool
centimeter
millimeter
meter
kilometer
4
Soil is example of
element
compound
mixture
5
Which is an example of a mixture
air
salt
water
oxygen
6
Who discovered the nucleus and put electrons around it.
Thomson
Bohr
Rutherford
Dalton
7
opposite of vaporization
melting
condensation
boiling
evaporation
8
When you put 3 liquids in a beaker how do you know which is the densest?
sinks to the bottom
floats to the top
stays in the middle
9
Where are electrons likely to hang out according to the modern theory
nucleus
rings
clouds
everywhere
10
What do you use to measure liquid volume
graduated cylinder
flask
balance
test tube
11
What is the amount of matter in an object?
density
volume
space
mass
12
What is the mass number if there are 17protons, 18neutrons and 17 electrons
35
1
17
18
13
Example of a chemical change
melting ice
dry ice smoking
cutting hair
burning paper
14
Convert 98.75km to m
.009875 m
9.875m
987500 m
.9875 m
15
flammability, reactivity and solubility are example of ___
chemical properties
physical properties
16
What is the formula for density?
weight/distance
volume/weight
distance/mass
mass/ volume
17
What would the charge of magnesium be if it has 12 protons and 10 electrons
-1
+2
+1
-2
18
In the formula H
2
O , what does the 2 stand for?
number of hydrogen atoms
number of oxygen atoms
number of water molecules
19
Where is most of the mass of an atom?
all over
the electrons
nucleus
electron clouds
20
where is most of the mass of an atom
electron
electron clouds
the atom
nucleus
21
when elements form compounds they...
make a new substance
change physically
stay exactly the same
22
good conductor, luster, ductile, malleable
nonmetal
metal
metalloid
23
If you did an experiment testing how water affects plants. What is the independent variable?
water
the plant
growth
soil
24
If you wanted salt to dissolve quickly in water which one would you not do....
add ice
crush the pieces
stir it
heat it
25
atomic number =
neutrons
protons
electrons & neutrons
26
used in nuclear plant to make long lasting energy
fission
fusion
27
feels soapy, pH of 10.5
base
salt
acid
28
Atoms in group 1 like to make ionic bonds with....
halogens
noble gases
transition metals
alkali earth
