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Classroom Chemistry Review
Classroom Chemistry Review
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A review for the Classroom Chemistry unit in the Grade 5 Science curriculum in Alberta, Canada.
Flashcards
52 cards
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Questions
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Answers
1
A colour change is when...
Bubbles are formed.
The colour of the mixture changes.
Energy is released.
Precipitate appears.
2
Describe a method to separate the following: A goop mixture of corn starch and water.
Evaporation
Use sieves
Cool water (dilute) & filter
Magnets
3
When 2 liquids do not mix, the top liquid is not as ___________________ as the bottom liquid.
Light
Warm
Slippery
Dense
4
When two or more substances are mixed together it is called a...
Evaporation
Solution
Chemical Reaction
Mixture
5
What do we usually use bases for in our homes?
To put on our cereal.
To power our electronic devices.
To make drinks more sour.
For cleaning, dissolving grease and other messes.
6
What is a heterogeneous solution?
A solution where everything is the same (type, amount, etc.)
A solution where all the properties are different.
7
What does pH stand for?
Potential of Healing
Possibly heavy
Pretty Hot
Potential of Hydrogen
8
Type of change: Making carbon dioxide with vinegar and baking soda...
Magic
Reversible
Irreversible
9
Length, width, thickness using any units describe the property of...
Colour
Size
Texture
Lustre
10
Think about the pH Scale. A solution can only be one of three types (pick the correct three)...
Natural
Acidic
Neutral
Basic
11
Type of change: Mixing salt and water...
Irreversible
Magic
Reversible
12
Bubbles are released when...
There is too much air in the liquid.
As a form of energy from a chemical reaction.
A colour change was about to occur.
Carbon dioxide or other gases are released in the reaction.
13
When you are trying to separate a solid from another solid, what technique would you
NOT
use?
Decanting
Magnets
Water
Sieves
14
When materials are mixed together they react and are never able to be separated...
Chemical Reaction
Suspension
Solute
Mixture
15
Describe how a base solution would feel, if you were to touch it.
Rough
Slimey
Warm
Slippery
16
A precipitate is when...
...heat is created.
...light is given off.
...two liquids are mixed together a solid is formed.
...bubbles form.
17
INSOLUBLE is...
A solid that CANNOT dissolve in water.
Sieve
Rice and water
A solid that PARTIALLY dissolves in water.
18
Which three items or solutions are considered basic.
Ammonium
Baking Soda
Antacids (TUMs)
Vinegar
19
A list of ALL the items and procedures used in your experiment that need to be kept the same.
Independent Variable
Dependent Variable
Controlled Variable
20
Smooth, rough, waxy, sticky, gritty, slippery describe the physical property of...
Texture
Shape
Colour
Size
21
Any solid that
CAN
dissolve in water is...
Supersaturated
Suspension
Soluble
Insoluble
22
What is the best explanation for how water can bulge.
Water is like oil and coats objects.
Water is sticky and stays on objects.
The molecules create more space and spread out.
Cohesion of the H2O molecules is very strong & will stretch.
23
Solid, liquid, and gas describe
WHICH
property we use to describe an object?
Hardness
Colour
State
Shape
24
What would be the best technique to separate a mixture of beans and rice?
Sieves (various sizes)
Evaporation
Distilling
Magnet
25
Type of change: Burning a candle or match...
Irreversible
Magic
Reversible
26
Explain what happened when we poured vinegar in the cup, with the raw, un-cracked egg.
Egg turned into rubber.
Vinegar evaporated.
Vinegar and calcium made a chem reaction. Shell dissolved.
The vinegar washed the egg shell off.
27
What you think is going to happen during your experiment, closely related to your problem and based on prior knowledge.
Answer
Prediction
Solution
Hypothesis
28
What would you use to separate iron nails and zinc nails?
Coffee Filter
Wind
Magnet
Water
29
For each experiment only ____ variable(s) can be changed to make it a FAIR TEST.
As many as you need.
2
1
None
30
A solution that is neither acidic nor basic is called...
Gas
Neutral
Solution
Slippery
31
Which of these
ARE
products of chemical reactions?
Bubbles
Energy Release
Precipitate
Solution
32
We can use a special kind of paper called ____________ to test for an acid or a base?
Litmus Paper
Basic Paper
Caustic Paper
Acid Paper
33
Describe a method to separate the following: A solution of sugar dissolved in water.
Decanting
Distilling
Evaporation
Filtering
34
What technique would you use to separate oil and water?
Evaporation
Sieve
Decanting
Water
35
Describe the taste of an acid...
Tastes like nothing/water
Sour
Sweet
Spicy
36
Pick two substances that have pH values of 7.0.
Ammonia
Milk
Blood
Vinegar
37
A dependent variable is...
The variable you change to answer the hypothesis.
The result of the independent variable.
The variable that stays the same.
38
What is the one thing you should
NEVER
do in order to test the pH of a substance/solution?
Taste it.
Touch it with litmus paper.
Put it in water.
39
What is a homogeneous solution?
A solution where all the properties are different.
A solution where everything is the same (type, amount, etc.)
40
The process of decanting is...
Removal of one liquid from another using a sieve.
Separation of one liquid from another by pouring.
Cooling it down until it liquifies.
Using a coffee filter to separate liquids.
41
Name three items or solutions that are considered acidic.
Tide Clothes Detergent
Bleach
Vinegar
Lemon Juice
42
Water molecules love to...
Stick together
Move around
Expand
To be dry
43
Which of these is
NOT
one of the properties used to describe an object.
Size
Shape
age
Lustre
44
An independent variable is...
The variable that stays the same through the entire experiment.
The variable that you change to test your problem.
The answer to your hypothesis.
45
Dissolves? Yes or No ---> Water & Cornstarch
YES
NO
46
Type of change: Mixture of iron filings and rice...
Magic
Reversible
Irreversible
47
When two or more liquids or a liquid and a solid do not mix, they form a...
Precipitate
Solution
Mixture
Suspension
48
Dissolves? Yes or No ---> Water & Talc (Talcum Powder)
YES
NO
49
Dissolves? Yes or No ---> Water & Baking Powder
YES
NO
50
Name the acid that is found in our stomachs. What does it do?
Hydrochloric Acid. It dissolves the food we eat.
Carbon Dioxide. It dissolves the food we eat.
Hydrochloric Acid. It makes our food wet & soft, like water.
Citric Acid. It softens the food that we eat.
51
The cohesive forces of water form a film on the water called...
Chemical Reaction
Precipitate
Surface tension
Belly flop
52
If a substance has a pH of 13.4, what can be said about it?
It is very acidic.
It is sea water.
It is safe to touch.
It is very basic.
