1. Chemical Reactions
SNC2D

2. Changes
A change in which no new substances are formed is called a ?

3. Changes
A change in which no new substances are formed is called a physical change.

4. Changes
A change in which no new substances are formed is called a physical change.
e.g. ice melting
(both ice and water are H2O)

5. Changes
A change in which new substances are formed is called a ?

6. Changes
A change in which new substances are formed is called a chemical change or chemical reaction.

7. Changes
A change in which new substances are formed is called a chemical change or chemical reaction.

8. Signs and Symptoms
Recall the signs that a chemical reaction may have occurred:

9. Signs and Symptoms
Recall the signs that a chemical reaction may have occurred:
heat produced or absorbed

10. Signs and Symptoms
Recall the signs that a chemical reaction may have occurred:
heat produced or absorbed
light or sound produced

11. Signs and Symptoms
Recall the signs that a chemical reaction may have occurred:
heat produced or absorbed
light or sound produced
colour change

12. Signs and Symptoms
Recall the signs that a chemical reaction may have occurred:
heat produced or absorbed
light or sound produced
colour change
gas produced

13. Signs and Symptoms
Recall the signs that a chemical reaction may have occurred:
heat produced or absorbed
light or sound produced
colour change
gas produced
precipitate formed in solution

14. Equations
Chemical reactions can be represented by either:

15. Equations Chemical reactions can be represented by either:
word equations using the names of the chemicals (e.g. carbon dioxide, water)

16. Equations Chemical reactions can be represented by either:
word equations using the names of the chemicals (e.g. carbon dioxide, water) or
chemical equations using the formulas of the chemicals (e.g. CO2, H2O)

17. Reactants
The substances that are reacting are called ?

18. Reactants
The substances that are reacting are called reactants and are written on the left side of the equation. There may be only one; if there is more than one, they are separated by ?

19. Reactants
The substances that are reacting are called reactants and are written on the left side of the equation. There may be only one; if there is more than one, they are separated by + signs.

20. Reactants
The substances that are reacting are called reactants and are written on the left side of the equation. There may be only one; if there is more than one, they are separated by + signs.
e.g.
carbon dioxide + water
CO H2O

21. Products
The new substances formed in the reaction are called ?

22. Products
The new substances formed in the reaction are called products and written on the right side of the equation.

23. Products
The new substances formed in the reaction are called products and written on the right side of the equation.
e.g.
oxygen gas + glucose

24. Products
The new substances formed in the reaction are called products and written on the right side of the equation.
e.g.
oxygen gas + glucose
O C6H12O6

25. The two sides of the equation are separated by ?

26. The two sides of the equation are separated by an arrow (pointing right) that is read as ?

27. The two sides of the equation are separated by an arrow (pointing right) that is read as “produces” or “yields.”

28. The two sides of the equation are separated by an arrow (pointing right) that is read as “produces” or “yields.”
e.g.
carbon dioxide + water oxygen gas + glucose
CO H2O O C6H12O6