Matter
What is matter?
Anything that has mass
Or takes up space
What is a chemical change?
Rearranging of atoms in a molecule to create something new.
Name 3 signs of a chemical reaction.
(Answers vary)
Permanent change in colour
Heat is produced
Gas is produced
Atom vs. Molecule
Atoms are smallest unit of matter
Molecules are atoms bonded together
What reaction happened in the mini-volcano?
An acid and a base react to create carbon dioxide (gas)
Give an example of when odour (smell) is produced in a chemical reaction.
Candles, bath bombs.
What is the molecule and what are the atoms in water? (What is water made out of?)
2 atoms of hydrogen and 1 atom of oxygen. The molecule is H2O.
Can you undo a chemical reaction?
No!
What sign(s) did you see in the mini-volcano?
Gas is produced(bubbles).
Is air matter?
Yes
It has mass
And takes up space
Give an example of how chemical changes are irreversible.
(Answer may vary)
Baking a cake, burning wood, glow sticks.
Is food colouring added to water a chemical reaction?
No, it's not.
Food colouring simply dissolves into the water, it does not create a new substance.
What is the difference between weight and mass?
Weight is a force of gravity on an object.
Mass is the amount of matter an object contains.
What is the difference between chemical change and physical change?
Physical change is only a change in state or shape.
Chemical change is change of composition of a substance that results in NEW substance.
What is a precipitate?
When a solid forms inside a liquid due to a chemical reaction.