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Duplicate of Science 9 Matter and Chemical Change Flashcards | StudBud
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Duplicate of Science 9 Matter and Chemical Change
Duplicate of Science 9 Matter and Chemical Change
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Grade 9 Chemistry topics 1 to 4
Flashcards
36 cards
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Practice quiz
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Questions
36
Answers
1
What is a correct property of metals?
Liquids at room temperature
Brittle
Poor conductors
Solids at room temperature
2
Which would slow down a reaction?
heating up the reaction
adding a catalyst
increasing the concentration of the reactants
using a larger reaction vessel
3
Which reaction does NOT always include oxygen?
cellular respiration
endothermic
combustion
corrostion
4
What is the name of BeCl2
Monoberyllium dichloride
Beryllium Chloride
Beryllium Dichloride
Boron dichloride
5
What is a chemical family?
Elements that have similar symbols
related elements that have similar properties
Related elements that have similar masses
Related elements that have similar chemical reactions
6
A Bohr Diagram for Lithium (atomic number 3) would have
1 valence electron
2 valence electrons
no valence electrons
3 valence electrons
7
Which halogen would be the least reactive? the element in...
period 1
period 2
period 6
period 8
8
Burning paper is an example of....
physical change
chemical change
quantitative property
malleability
9
Mixtures that you cannot see the different parts is called..
heterogeneous
Mechanical mixtures
colloids
homogeneous
10
Salt and water may be classified as...
colloid
solution
element
heterogeneous
11
Which of the following is a qualitative property?
0 degrees Celsius
14 cm/s
3 g/ mL
ductility
12
You react 15 grams of sulfur with oxygen to create 35 grams of Sulfur dioxide. How much oxygen did the reaction use?
15 grams
5 grams
20 grams
50 grams
13
An element has an atomic mass of 15 and an atomic number of 8. It must have ___ protons.
8
15
7
23
14
Ice melting is a...
physical change
chemical change
property of density
quantitative property
15
JJ Thompson's atomic model was the...
Billiard Ball Model
Planetary Model
Solar System Model
Plum Pudding Model
16
Which family is found in group 2
Alakli Metals
Alkaline Earth Metals
Halogens
Noble Gases
17
How conifident do you feel about your chemistry knowledge going into science 10?
2 - not very confident, I understand little of this
3 - decently confident, I understand most of it
1 - not confident at all, I don't know any of this
4 - very confident, everything we learned makes sense, I did all the work
18
An atom has 7 valence electrons, what will its charge be as an ion?
-2
-1
+1
+7
19
What is a correct property of non-metals?
Good conductors
Malleable
Ductile
not very shiny
20
Which type of reaction would have heat as a product?
exothermic reactions
endothermic reactions
21
The correct formula for Lithium Nitride is
Li2N3
LiN
LiN3
Li3N
22
Which describes an ionic compound?
often a gas
melts at a low temperature
made of nonmetals only
made up of 2 charged ions
23
Heterogeneous mixtures may be classified as...
mechanical mixtures
compounds
solutions
pure substances
24
If the total mass of the reactants is 30 g...after the reaction the total mass will be...
More than 30 g
It's impossible to tell
30 g
Less than 30 g
25
Sulfur has a 2- charge, Potassium has a 1+ charge. What would the compound be?
KS2
SK2
K2S
S2K
26
A reaction feels warm to when you touch the beaker, this means that it was
endothermic
exothermic
acidic
corrossive
27
Aluminim and oxygen make a compound, the name would be
Oxygen aluminide
Aluminum oxygen
Aluminum oxide
Dialuminum trioxide
28
What is the name of this compound: C2H6
Carbon Hexahydride
Dicarbon Pentahyrdogen
Carbon Hydride
Dicarbon Hexahydride
29
What does the staircase tell us on the periodic table?
ionic vs. molecular
solids vs. liquids
metals vs. nonmetals
atomic masses vs. atomic numbers
30
If an atom has 2 electrons in the 2nd shell, it would likely
gain 2 e to become an ion
gain 6 e to become an ion
lose 2 e to become an ion
lose 1 e to become an ion
31
A reactivity to oxygen is what kind of property?
physical property
it isn't a property
chemical property
quantitative property
32
The correct name for Na
2
O is
sodium oxide
Disodium monoxide
sodide oxide
disodium oxygen
33
Which are the most stable elements on the periodic table?
Halogens
Alkali Metals
Alkaline Earth Metals
Noble Gases
34
Dalton's model was....
Solar System Model
Billiard Ball model
Muffin Model
Planetary model
35
What is the definition of a molecular compound?
it is made of metal and nonmetal elements
it is made of only nonmetal elements
it is made of only metal elements
it is made of two different elements
36
A light bulb burning out is what kind of change?
Physical change
Chemical change
A change of state
Time to change the bulb
