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Materials : Properties and Changes
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When oxygen reacts with glucose, it will produce carbon dioxide and water. What are the reactants of the reaction?
Oxygen and glucose
Mention two factors that affect rate of dissolving.
Heating and stirring.
Ms Yaya uses vinegar and baking soda to make bubbles (carbon dioxide). What is the evidence of that chemical reaction?
Bubbles (Gas) formation
Ms Yaya uses vinegar and baking soda to make bubbles (carbon dioxide). What is the product in the reaction?
Bubbles (Carbon dioxide)
Ms Yaya uses vinegar and baking soda to make bubbles (carbon dioxide). What are the reactant in the reaction?
vinegar and baking soda
Anton making 2 glasses of sweet tea but he uses different temperature of water. In the first glass, the water is 40 degree C. In the second glass the water is hotter. In which glass will the sugar dissolve faster?
second glass, because the temperature is higher.
Metal rusting is reversible or irreversible?
irreversible
Dissolving is reversible or irreversible?
reversible
When something changes and it can turn back. we call it .............. change.
reversible
Plastic, wood, and paper are conductor. True or false?
False, they are insulator.
Metals are conductor. True or flase?
True
What is thermal conductor?
Materials that conduct heat
We can't feel air unless it is .....
moving
Gases have true properties : take up space and have mass. True or false?
True
Evaporation can occur at any temperature, but most liquids boil when they are .....
heated
The process when all the particles in the liquid have enough energy to become a gas is .....
Boiling
The process when particles on the surface of a liquid change into a gas is called .....
Evaporation
Liquids change to gases when they boil and evaporate. True or false?
True
Temperature at which particles throught a liquid have enough energy to change to a gas is .....
boiling point
Something about substance that allows us to tell it apart from other substances is .....
A property


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