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Chemical Reactions (8th Grade) - Review
If a chemical reaction is endothermic it
An isotope has the
Chemical Reactions (8th Grade) - Review
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8th Grade Chemical Reactions Test Review
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Answers
1
An isotope has the
same number of protons, neutrons, and electrons
same number of protons and neutrons
same number of neutrons, but a different number of protons
same number of protons, but a different number of neutrons
2
If a chemical reaction is endothermic it
absorbs energy
gets warm
released energy
gets cold
3
Chemistry is the study of
substances
protons
atoms
elements
4
The atomic number tells you the number of
neutrons
reactions
elements
protons
5
If an atom has an atomic # of 30 and a mass of 65, how many neutrons does it have?
30
35
95
65
6
How many atoms are in the molecule: NH
3
?
3
1
2
4
7
An atom is
the least important type of matter
the largest possible piece of matter
the counterpart to Eve
the smallest possible piece of matter
8
What do we call the horizontal rows on the Periodic Table of Elements?
sets
sections
groups
periods
9
The valence rule states that
atoms want a full outer shell of electrons
atoms want to have the least number of neutrons
atoms want to have the most number of neutrons
atoms have no electron shells
10
The Law of Conservation of Matter states that matter
can appear out of nowhere in a chemical reaction
does not actually exist
is created and destroyed in most chemical reactions
may not be created or destroyed in a chemical reaction
11
If a chemical reaction is exothermic it
feels cold
releases energy
absorbs energy
feels warm
12
Most (99%) of the elements found on the left side of the periodic table are
semi-metals
metals
gases
noble gases
13
A chemical reaction is when
one substance instantaneously changes to another substance
two or more substances break apart
two or more neutrons collide with one another
two or more substances either bond together or split apart
14
If an atom has an atomic # of 42 how many protons does it have?
84
40
42
1
15
Atomic mass is
neutrons + electrons
protons + neutrons
just protons
protons + electrons
16
How many atoms are in the molecule: H
2
O?
1
3
2
4
17
An atoms "identity" is determined solely by what?
It's number of protons
It's number of neutrons
It's number of electron shells
It's number of electrons
18
The far right column of the periodic table is known as
alkaline earth metals
semi-metals
noble gases
alkaline metals
19
How many electron shells would you expect an element from the 3rd period to have?
4
2
3
1
20
What do we call the vertical columns on the Periodic Table of Elements?
sets
periods
groups
sections
