A
When we combine two substances, we always form a _________.
What is mixture?
The salt in saltwater is the _____________
What is solute?
A chemical reaction is...
What is irreversible?
On the pH scale, bleach is a(n)...
What is base?
When salt mixes into water, it is...
What is dissolving?
When we put sugar in our coffee, we are
adding a ________ to a ___________.
What is solute to a solvent?
Dissolve
What is when a substance becomes mixed into a liquid to form a solution where we cannotsee the two substances separately.
Surface Tension
What is the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer. This allows insects to walk on water?
Carbon dioxide
What is a gas that makes up 0.04 percent of the air in our atmosphere?
A mixture?
What is a substance made by mixing other substances together?
Two substances that can dissolve in water
What is salt and sugar?
Two substances that canNOT dissolve in water
What is chalk and oil?
How do you know if a chemical reaction has occured?
What is a chemical reaction has occurred if there is a new substance formed when two substances are mixed together?
Carbon dioxide is produced by...
What is it can be produced by burning materials that have carbon in them and then exposing the burning material to oxygen – air?
What is the air in our atmosphere made up of?
Mostly nitrogen with a oxygen mixed in. Then small amounts of other gases make up the last 1 percent.
What is the difference between soluble and insoluble substances?
What is soluble substances will dissolve into a liquid and insoluble substances will not?
Uses of acids and bases
What is we use them to keep us healthy, digest our foods, and start car batteries. They can also be used in cleaners?
What evidence tells you that a chemical reaction has occurred?
What is a smell, energy change, gas bubbles, precipitate formation or a change in colour in the new substance?
How do you know if matter has changed chemically or physically?
What is if it can be reversed, it is a physical change and if it can’t be reversed, it is a chemical change.
Importance of a pH scale
What is so we understand what liquids are and how they can help us and also how dangerous they are?
How can we separate substances in a mixture?
What is you could evaporate the liquid in a substance to extract the other substance out. You could also use a filter to filter out a substance.
Why is salt mixing with water a physical change?
What is if you let the water sit for a long period of time, it will eventually evaporate and separate from the salt?
Give 2 examples of chemical reactions.
What is two examples of chemical changes are an egg boiling in water and food colouring mixing with water. The egg will smell differently and have an energy change as it will heat up. The water that has had food colouring added has a colour change.
Give 2 examples of physical reactions.
What is a paper is ripped in half and mixing sand and water?
2 examples of bases and 2 examples of acids
Bases: liquid drain cleaner, bleach, ammonia solution, baking soda, sea water
Acids: battery acid, hydrochloric acid, lemon juice, vinegar, grapefruit juice, soda, tomato juice, coffee