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8th Grade Chemistry Flashcards | StudBud
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8th Grade Chemistry
8th Grade Chemistry
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#chemistry #elements #eighthgrade
Flashcards
39 cards
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Questions
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Answers
1
When making a solution of Kool Aid, the water is the
solvent
product
solute
reactant
2
The atomic mass (mass number) of lithium is
3
4
7
6
3
How many atoms are in CO2?
1
3
4
2
4
A proton has a _______ charge
Neutral (No Charge)
Electric
Negative
Positive
5
Which 2 elements are liquid at room temperature and standard pressure?
Beryllium (Be) and Magnesium (Mg)
Iodine (I) and Silver (Ag)
Bromine (Br) and Mercury (Hg)
Silicon (Si) and Arsenic (As)
6
How many neutrons does Lithium have?
7
4
3
10
7
Which of these is an element?
H2O
CO2
Au
CaCl
8
The number of neutrons in an atom...
is equal to the atomic number
is the mass minus the atomic number
is the atomic number minus the mass
is equal to the mass number
9
CaCO2 --> CaO + CO2 In this chemical reaction, the products are best classified as
Two compounds
Two compounds and one element
One element and one compound
Two elements
10
The concentration of which ion makes a solution acidic?
OH-
H+
Cl-
Na+
11
There can be up to ____ electrons in the 2nd energy level.
4
8
18
2
12
How many ELEMENTS are in NaOH?
2
1
4
3
13
An atom is made up of protons, electrons, and ________
Neutrons
Matter
DNA
Nuclei
14
How many electrons does Lithium have?
3
4
10
7
15
What is the symbol for Sodium?
K
Na
So
Sd
16
Brittle means?
soft and bendable
Easily cracked or fractured
Man-made
Smooth
17
True/False - The Noble Gases are very reactive.
True
False
18
In this diagram of a sugar particle, the lines connecting the round atoms represent...
light energy
Gravitational forces
Chemical bonds
Magnetic fields
19
How is an element different than a compound?
An element has only one type of element
A compound has only one type of element in it
A compound can be easily separated into its elements
An element is made of 2+ types of elements
20
The particle in an atom with no charge is called a
nucleus
electron
proton
neutron
21
The _____ number is the amount of protons or electrons in an atom.
Mass
Elemental
Atomic
Phone
22
Reactive means ________
Responds to other elements
transfers electricity and heat
Reflects light
Man-made
23
Metalloids have characteristics of
metals
Non-metals
Neither metals nor non-metals
Both metals and non-metals
24
How many protons does Lithium have?
3
4
10
7
25
NaCl is an example of a
Mixture
Liquid
Element
Compound
26
If there are 6 carbons atoms at the start of a reaction, then how many should there be after?
12
6
3
Cannot say unless see the reaction
27
A compound is two or more elements chemically bound
that is made up of a single type of atom
that break easily
that lose their properties and create a new substance
that keep their properties
28
A pH of 4 would be _________ than water.
more neutral
more toxic
more acidic
more basic
29
The best way to increase the amount of salt that dissolves in water would be to
Increase the salt temperature
Decrease the water temperature
Increase the water temperature
Decrease the salt temperature
30
A pH of 14 is
Strongly acidic
Weakly acidic
Strongly basic
Weakly basic
31
True or False: There are more metals than non-metals on the periodic table.
False
True
32
a pH of 7 is
neutral
toxic
basic
acidic
33
How many atoms are in this formula: Cu(NO3)2?
5
6
9
8
34
What is the atomic number of Boron (B)?
10
2
18
5
35
Alkali Metals are known to be the least reactive metals on the periodic table.
False
True
36
Which of the following is not considered to be matter?
air
water
metal
energy
37
Which of these is a compound?
Fe
Al
C
CO2
38
Lead is an example of a
Pencil
Element
Mixture
Compound
39
Which element is an example of a strong conductor of heat or electricity?
Oxygen
Copper
Chlorine
Helium
