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chemistry review
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Review of basic periodic table information. #8thgrade #physicalscience
Flashcards
15 cards
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Questions
15
Answers
1
How many protons does lithium have?
7
3
10
4
2
In a physical change
new substances are formed
molecules are changed
only a solid can change into a liquid by heating
molecules remain unchanged
3
How many valence electrons does boron have?
3
2
5
11
4
Which metal property helps us shape iron into a variety of pots and pans?
malleable
shiny
ductile
conducts heat
5
Atoms of the same element can have different masses because they can have different numbers
of neutrons
of electrons
of protons
of protons and electrons
6
Which of the following is a good illustration of a chemical change?
salt dissolving into water
ice melting to form water
water boiling to form vapor
sugar melting to form caramel
7
What is the chemical formula for magnesium chloride?
MgCl
Mg2Cl
MgCl2
Mg2Cl2
8
What happens to the reactivity of a metal as you move from left to right on the periodic table?
increases
sames the same
decreases
metals are not reactive
9
Who proposed the idea of energy level based on experimentation?
Rutherford
JJ Thomson
Bohr
Dalton
10
Which of the following pair will result in a neutralization reaction
Ca(OH)2 and LiOH
HF and KOH
HBr and HF
H20 and Mg(OH)2
11
How many neutrons does fluorine have?
10
9
7
19
12
Groups of atoms which can substitute for hydrogen in hydrocarbon molecules are
COOH, NH2, O2
OH, NH2, O2
OH, COOH, NH2
O2, OH, COOH
13
Which of the following is a structural diagram representing a compound?
B
D
C
A
14
Lewis-dot structure for aluminum would have how many dots?
13
8
3
27
15
Predict which element is the most reactive nonmetal?
C
I
O
F
