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Final Chemistry Test
Final Chemistry Test
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7th grade chemistry final
Flashcards
52 cards
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Practice quiz
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Questions
52
Answers
1
In liquids that are very dense the particles are_______________________.
spread out
less compact
more compact
2
a liquid that is more dense will float on top of a less dense liquid
true
false
3
acids have a ph above 7.
false
true
4
A scale used to measure acids and bases
base
chemical change
ph
acid
5
how many atoms are in 4H
2
O?
6
4
10
7
6
the atomic number tells you the number of protons and electrons in an element
false
true
7
carbon, gold, silver, oxygen are all examples of ______________.
compounds
mixtures
gases
elements
8
two or more like or unilike atoms that are bonded together.
molecule
atom
compound
mixture
9
neutrons are found in the nucleus and have a zero charge
true
false
10
How many different elements are in sodium bicarbonate - NaHCO
3
4
5
3
2
11
a wooden block sinks in water has a density less than 1.0 g/ml.
true
false
12
a substance with a bitter taste and ph range of 7.1-14
base
acid
13
how many atoms of hydrogen are in the reactants<
2
1
4
3
14
density equals mass divided by ______________________.
volume
weight
mass
15
what is the mass of the rock?
250.9 g
453 g
354.6 g
300.54 g
16
made out of one type of atom - found on the periodic table
element
compound
molecule
atom
17
density does not depend on the size or quantity of matter
true
false
18
The equation for a chemical reaction is balanced and show which law?
heat
Conservation of matter
gravity
19
How many molecules are in 6 H
2
O?
7
1
9
6
20
atoms that have a covalent bond share electrons
true
false
21
Which can't be separated?
water
carbon
salt water
mixtures
22
water can be seperated into oxygen and hydrogen using electrolysis.
true
false
23
crushing a can is an example of a ________________ change.
chemical
physical
24
In the equation - how many molecules of oxygen are there?
4
6
2
3
25
atoms that have the same number of protons have different properties
false
true
26
a change that takes place at the atomic level and produces new substance
chemical change
physical change
27
hand soap is a common base.
true
false
28
like charges attract and opposite charges repel.
true
false
29
To find neutrons subtract the atomic number from the ___________________.
atomic symbol
atomic volume
atomic mass
30
how much matter or stuff is in a substance
volume
density
mass
matter
31
the amount of space taken up by a substance or object
volume
density
matter
mass
32
A change in size or shape of substance
physical change
chemical change
ph
33
when a substance is heated the density will _______________.
increase
decrease
34
burning a candle is an example of a _____________ change.
chemical
physical
35
two or more different types of atoms chemically bonded together to form a new substance
molecule
mixture
compound
atom
36
baking soda and vinegar bubble and produce gas. This is a _____________ change.
chemical
physical
37
made out of different substances that can be separated back into the original substances
mixture
element
compound
matter
38
what type of bond is shown?
covalent
ionic
39
a sink/float graph shows objects that sink ________________ the density of water line.
above
below
40
a substance with a sour taste and a ph range of 0-6.9
acid
base
41
The study of matter and how matter behaves
chemistry
biology
earth science
physics
42
Which of the following densities would have molecules packed more tightly together?
2.49 g/ml
.55 g/ml
.93 g/ml
2.43 g.ml
43
how much volume is in the graduated cylinder?
6 ml
6.7 ml
7.5 ml
6.6 ml
44
mixtures and solutions are formed through ___________________ changes.
physical
chemical
45
compounds are formed through ______________ changes.
physical
chemical
46
a rusty nail is an example of a _________________ change.
chemical
physical
47
reactants break their bonds and rearrange to form new substances called products
true
false
48
saltwater and fruit salad are examples of ____________________.
mixtures
solutions
compounds
elements
49
The smallest unit of matter
cell
compound
atom
molecule
50
The right side of the equation shows what?
products
reactants
51
anything that has mass and takes up space
mass
volume
matter
density
52
chemical changes are easy to reverse
true
false
