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8th Grade Chemistry Review: Atomic Structure, Elements, Molecules & Mixtures Flashcards | StudBud
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8th Grade Chemistry Review: Atomic Structure, Elements, Molecules & Mixtures
8th Grade Chemistry Review: Atomic Structure, Elements, Molecules & Mixtures
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Choose what the picture respresents for compound, element, or mixture
Flashcards
28 cards
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Questions
28
Answers
1
Are these molecules pure?
Yes - pure substance
NOT pure substances
2
This type of element is located on the left of the stair step:
gases
non-metals
metalloids
metals
3
What does the graphic represent?
Element Molecule
Mixture
Compound Molecule
4
What does this graphic represent?
Mixture of Compound Molecules
Solid
Mixture of Element Molecules
Mixture of Atoms
5
Electrons on the outermost shell are called:
outer electrons
elements
electron cloud
valence electrons
6
Atoms of different elements ALWAYS have different number of protons.
True
False
7
Element or Molecule?
Element Molecule
Element
Compound Molecule
8
The elements or substances before a chemical reaction occur are called _______________.
reactants
products
reactions
coefficients
9
Is the following chemical equation balanced or unbalanced?
unbalanced
balanced
10
In neutral atoms, the # of protons = the # of ______________.
electrons
atoms
elements
neutrons
11
What does this graphic represent?
Mixture of Compound Molcules
Solution
Mixture of Element Molecules
Mixture of Atoms
12
Atoms are mostly empty space.
False
True
13
How many elements are below?
6
12
3
24
14
What does this graphic represent?
Element Molecules
Atoms
Compound Molecules
Mixture of Molecules
15
What does this graphic represent?
Solid
Element Molecules
Compound Molecules
Mixture of Molecules
16
Elements with similar reactivity and chemical properties are located in the same _____________.
period
section
group
row
17
What is the atomic mass of this model?
6
4
2
18
Elements in the same ____________ have the same number of energy levels/orbitals.
section
group
column
period
19
Which part of the chemical equation represents the chemical reaction?
chemical formula
yield sign
chemical symbols
addition sign
20
Is this chemical equation balanced or unbalanced ?
balanced
unbalanced
21
What is the atomic number of this model?
6
4
2
22
Elements on the Periodic Table are arranged in the order of increasing ___________________.
electrons
mass of nuclues
Atomic #
neutrons
23
How many atoms are below?
2
10
8
4
24
How many molecules are below?
9
6
2
3
25
The atomic mass contains which subatomic particles?
protons
electrons
neutrons
both neutrons and protons
26
All the mass of an atom can be found in the _____________.
nuclues
protons
electrons
orbitals
27
What does this graphic represent?
Compound Molecules
Element Molecules
Solid
Mixture
28
If an atom has 4 protons and 4 electrons what is the charge of the atom?
positive
negative
neutral
