The substance that does the dissolving. For example: the water in the salt-water solution.
100
How are air and carbon dioxide similar?
Air is made up of Carbon Dioxide and other gases but both are odourless, colourless and are found in the atmosphere.
100
What is a saturated solution?
A solution that is not able to dissolve any more solute.
100
Shiny, dull and metallic describe what physical characteristic?
Luster.
100
What is one way to test whether something is an acid or a base?
Using litmus paper.
200
What is a solute?
The substance that get dissolved. For example: the salt in a salt-water solution.
200
Air is made of _____% carbon dioxide?
a) 4%
b) 40%
c) 0.04%
c) 0.04%
200
What does heating up the water do to the saturated salt solution?
It allows for more solute to be dissolved into the solution.
200
Solid, liquid and gas describe what physical characteristic?
State of Matter.
200
What are two characteristics of an acid?
-has a pH of less than 7
-has a sour taste
-is corrosive
-turns blue litmus paper red
300
What is a suspension?
A mixture in which very tiny particles of solid remain suspended without dissolving.
300
What is one way to produce carbon dioxide?
Answers will vary.
300
Is growing a crystal a reversible or irreversible change? Explain.
Reversible because the salt crystals could be dissolved back into water.
300
Frying an egg is an example of reversible or irreversible change?
Irreversible Change.
300
What are two characteristics of a base?
-has a pH of more than 7
-has a bitter taste
-is slippery to touch
-turns red litmus paper blue
400
What is a mixture?
The combination of two or more substance. These substances could be solids, liquids or gases.
400
If there was a tank of oxygen and a tank of Carbon Dioxide what is one test to you could do to be able to tell which is which?
Answers will vary.
400
What could make a crystal grow bigger?
Heating the water and making sure that the solution is completely saturated.
400
What are one of the four indicators or physical change?
-Colour Change
-Bubbles
-Energy is released (cooked or lit on fire)
-Precipitate is formed (solid)
400
When testing acids and bases using litmus paper, what can you determine if the red litmus paper stays red and the blue litmus paper stays blue?
The liquid is neutral which means it has a pH of 7.
500
What is the difference between a mixture and a solution?
A solution is a type of mixture but in a solution you can not longer see the different parts.
500
Explain why a flame goes out when Carbon Dioxide is poured over a lit candle.
Answers may vary. Carbon Dioxide is a relatively heavy gas and it sinks. The carbon dioxide smothers the flame because there is a lack of oxygen so the flame is extinguished
500
What could make a crystal grow faster?
Cool the solution more slowly.
500
Water is different from most other liquids because of its ______?
Surface Tension
500
Aspirin, vitamin C and fertilizer are all examples of an acid or base?