1. Physical and Chemical Changes

2. Matter Matter – anything that has volume or mass.
Atoms are the smallest unit of matter!
Volume – anything that takes up space
Mass – the amount of matter that something is made of

3. MASS
Mass
Measured in grams with a balance

4. Volume Liquid Volume measured in liters Meniscus – the curve that
you see at the liquid’s
surface used to measure
the volume

5. What is the reading on this graduated cylinder?
56 ml

6. How about this one?
Be careful!!!
4.3 ml

7. Last one!
23 ml

8. Volume Solid Volume Measured in cubic meters (m3)
Cubic means “having 3 dimensions”

9. Remember
Inertia – tendency of all objects to resist any change in motion
More Mass Greater Inertia
harder to move an object with a large mass
harder to stop an object with larger mass once moving

10. B. Pure Substances Element matter composed of identical atoms
EX: copper

11. B. Pure Substances Compound
matter composed of 2 or more elements in a fixed ratio
properties differ from those of individual elements
EX: salt (NaCl)

12. A. Physical Property
A characteristic of matter that can be observed or measured without changing the identity of its matter.
can be used to separate mixtures
EX: density, color, odor, mass and volume

13. Chemical Property
A characteristic that indicates whether a substance can undergo a specific chemical change.
EX: flammability, reactivity

14. 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.

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

16. Physical Change

17. 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.

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

19. 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.

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

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

22. 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.

23. Density Problems

24. 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