1. CHEMICALS AND CHEMICAL CHANGE
Chapter 5.1
BLM 5.1a, 5.1b

2. Chemicals and chemical Change
CHEMISTRY – is the study of matter, its changes and its properties
MATTER – is anything that has mass and takes up space
ATOM – the smallest particle of matter

3. PHYSICAL CHANGE – a change in a substance which does not produce a new substance.
Easy to reverse
Ex. Melting ice
CHEMICAL CHANGE – a change in a substance which does produce a new substance.
Difficult to reverse
Ex. Match burning

4. Classification of matter

5. Classification of matter

6. Classify each substance as 1) A pure substance or a mixture, and 2) An element, molecule, heterogeneous mixture or homogeneous: a) Glass of milk b) Spoonful of sugar c) A bar of gold d) Orange juice with pulp

7. Science 10 – Nov. 3rd
Classify each reaction as a physical or chemical reaction: a) Butter melting b) Cheese molding c) Breaking a chocolate bar in half d) Burning toast

8. Science 10 – Nov. 3rd
Classify each substance as 1) A pure substance or a mixture, and 2) An element, molecule, heterogeneous mixture or homogeneous: a) Glass of milk b) Spoonful of sugar c) A bar of gold d) Orange juice with pulp

9. Physical Reaction vs. Chemical Reaction
Physical reactions are easy to reverse while chemical reactions are not.
Ex “When ice melts is it easy to reverse that reaction? Burning a match?”

10. Physical Trait vs. Chemical Trait
Physical traits are either simple observations or things having to do with physical reactions.
Color, smell, size, mass, boiling point, melting point.
Chemical traits have to do with chemical reactions.
Will it catch on fire?
Ability to react with other chemicals.
Stable or unstable.

11. Science 10 – Nov. 1st
1) Classify each as 1) Pure substance or mixture, then 2) Element, compound, homogeneous mixture or heterogeneous mixture.
Sugar
Copper wire
Air
Orange juice w/ pulp
Orange juice w/o pulp

12. Science 10 – Nov. 1st
2) Classify each as a physical change or a chemical change:
Food rotting
Breaking a carrot in half
Water boiling
Making toast
Dissolving salt into water

13. Science 10 – Nov. 1st
3) Classify each as a physical trait or chemical trait:
Water freezes at 0oC
Ethanol is a clear liquid
Gold does not react with acid
Aluminum is a malleable metal
Mercury metal is a liquid at room temperature

14. HOMEWORK QUESTIONS Page 175 QUESTIONS: #1,2,4,5,6,7
Explain in your own words the difference between element, atom, molecule and compound.
Work on project

15. SOLUTIONS TO HOMEWORK QUESTIONS
Q1 – classify each of the following as a pure substance or a mixture
A) soapy water
MIXTURE
B) hydrogen gas
PURE SUBSTANCE
C) sodium chloride

16. QUESTION 2 Classify each of the following as an element or a compound.
A) hydrogen
ELEMENT
B) potassium carbonate
COMPOUND
C) water
D) Mg

17. QUESTION 4
Classify each of the following as a physical property or a chemical property.
A) Gasoline is a clear pink solution
PHYSICAL PROPERTY
B) Gasoline burns in air
CHEMICAL PROPERTY
C) Water boils at 1000C.
D) electric current can split water into hydrogen and oxygen gases

18. QUESTION 5
When aluminum metal is added to hydrobromic acid, hydrogen gas and an aluminum bromide solution are formed.
A) What kind of change has occurred?
A chemical change has occurred because new substances were made.

19. QUESTION 5
When aluminum metal is added to hydrobromic acid, hydrogen gas and an aluminum bromide solution are formed
B) Which substances are the reactants and which are the products?
Reactants – Aluminum and Acid
Products – Hydrogen + Aluminum Bromide

20. QUESTION 6
Describe the chemical tests that can be used to identify the following gases.
A) hydrogen
a flaming wooden splint causes a “pop”
B) Oxygen
a glowing wooden splint relights (bursts into flame)

21. QUESTION 6 C) Carbon Dioxide
A burning wooden splint extinguishes, OR when the gas is bubbled through limewater, the limewater changes from a clear, colourless solution to a cloudy white liquid (a precipitate is formed)

22. QUESTION 6 d) Water Vapour
Changes the colour of cobalt chloride test paper from blue to pink

23. QUESTION 7
When sodium carbonate is added to water, the sodium carbonate dissolves. When hydrochloric acid is added to the solution, the solution fizzes. What kinds of changes have occurred?

24. QUESTION 7 - ANSWER
When sodium carbonate dissolves in water it is a physical change
A chemical change happens when gas is formed after hydrochloric acid is added ( fizz / Bubbles )