1. Matter: Physical and Chemical Changes Part 2

2. Physical Change
Physical changes occur when matter changes its property but not its chemical nature.
Physical changes could include a change in: texture, shape, size, color, odor, volume, mass, weight, and density.

3. Physical Change Remember! properties remain the same reversible
can be used to separate mixtures

4. Physical Change

5. Chemical Change
Chemical changes are changes matter undergoes when it becomes new or different matter.
To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat.

6. C. Chemical Change Remember! properties change irreversible
Signs: color change, formation of a gas/solid, release of light/heat

7. Chemical Change
A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

8. Density
Density describes how much mass is in a given volume of a material.

9. Density
Solids, liquids and gases are matter, so they all have density.

10. Determining Density
To find the density of a material, you need to know the mass and volume of a solid sample of the material.
Mass is measured with a balance or scale.
Use the displacement method or calculate the volume.

11. Density Problems

12. What is my Density? Volume 1. 500g 50ml 2. 300g 15ml 3. 25g 5cm3 Mass
Complete the following questions on a separate sheet of paper as a part of your homework assignment.
Mass g g
3. 25g
Volume
50ml
15ml
5cm3
50gl/200ml= 2.5 g/ml : 300g/255ml=1.18g/ml: 6.25g/5.75cm3= 1.09g/cm3 Answers

13. Quiz Yourself
Go through the following slides to quiz your knowledge of physical and chemical changes.
Remember there is a quiz tomorrow!

14. Is it a chemical or physical change?
Sugar dissolving in tea
Chemical Change
Physical Change

15. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

16. Correct!

17. Is it a chemical or physical change?
Logs burning
Chemical Change
Physical Change

18. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

19. Correct!

20. Is it a chemical or physical change?
Breaking water up by separating it into hydrogen and oxygen
Chemical Change
Physical Change

21. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

22. Correct!

23. Is it a chemical or physical change?
Cutting paper
Chemical Change
Physical Change

24. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

25. Correct!

26. Is it a chemical or physical change?
Crushing an aspirin
Chemical Change
Physical Change

27. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

28. Correct!

29. Is it a chemical or physical change?
Metal rusting
Chemical Change
Physical Change

30. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

31. Correct!

32. Is it a chemical or physical change?
Lighter fluid burining
Chemical Change
Physical Change

33. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

34. Correct!

35. Is it a chemical or physical change?
An egg rotting
Chemical Change
Physical Change

36. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

37. Correct!

38. Is it a chemical or physical change?
An egg breaking
Chemical Change
Physical Change

39. OOPS! Did it change size, color, shape (Physical Change)? or
Did it become different matter (Chemical Change)?

40. Correct!