1. Unit: Composition & Properties of Matter Chap 1

2. Cornell Notes: Objectives Explain matter in terms of both composition and its properties. Using examples, describe matter.

3. Use cornell notes I will provide the questions for the left hand side Your notes on the right should explain what these questions mean

4. Composition vs. Properties of Matter Composition = what matter is made of determined by classifying matter The most basic unit of matter is the atom

5. Properties = what matter is like or how matter behaves Properties are used to describe matter

6. Describe Matter Any thing that has mass and takes up space Therefore has mass & Volume Is air Matter???

7. What is Mass? Mass – amount of matter in an object NOT the same thing as weight Is NOT dependent on the location of object Is not affected by gravity Unit: Kg or grams Measure mass using an instrument called a balance

8. Mass vs. Weight Is a Force Unit: lbs. (english), but Newtons (N)  SI units Is affected by gravity, because is the force of gravity acting on a mass Dependent on location and gravitational force acting there Spring Scale measures weight

9. How is weight defined?

11. Converting B/w Mass and Weight Weight = Mass X g W = m g Newtons (N) Kg g = 9.8 m/s 2

12. variation of acceleration due to gravity on earth Where would you weigh the most?

13. Problem An object as a mass of 25 kg. What is it weight in Newton’s? W = mg W = 25 kg X 9.8 m/s2 W = 245 N

14. Problem If an object has a weight of 1500 N, what is its mass? W = mg 1500N = m X 9.8 m/s2 m = 153.06 kg

15. Find the mass of an object that has a weight of 950 N. W= m g 950N = 950 kgm/s 2 96.94 kg

16. Converting using pounds (lbs) for units Use Dimensional Analysis using Conversion Factors 1 lb = 4.45 N 1 kg = 2.2 lbs If a guy weighs 195 lbs, what is his weight in Newtons? 867.75 N

17. Mass/Weight Conversions A gold bar has a mass of 4 kg. What is its weight in pounds? 8.8 lbs. An box weighs 25 lbs. What is the mass of the box? 11.36 kg or 1136 grams

18. What is the mass of 1 ton of asphalt? 1 ton or 1000 kg What is the Weight of 1 ton of asphalt in pounds? 2200 lbs.

19. What is Volume? The amount of space an object occupies To determine the volume of a substance: Regular Shaped objects: V = Length X Width X Height

20. For an irregularly shaped object: Use Water displacement

21. meniscus Water Displacement: Read volume Before adding object Add object Read volume after adding object Volume of Object = difference b/w reading #2 and #1.

22. Volume Units: Liters, ml 1 ml = 1 cm 3

23. Density Mass of a substance per unit of Volume it describes the degree of compactness of a substance How much mass is packed into an amount of space

24. Ratio of mass to volume D = mass Volume units: g/ml or g/cm 3 ***Remember 1 cm 3 = 1 ml

25. Density Under constant conditions, density remains the same for a substance Since different substances have different densities, density measurements can be used in identifying substances Ex. Density of gold is 19.3 g/ml Density of Water 1 g/ml

26. Allows for a comparison of different substances (with even different amounts) by putting them on equal ground.

28. Density will change if substances changes state or phase of matter Solid – Liquid - Gas

30. How does Temperature Effects Density? Usually the Higher the temperature the Lower the Density.

31. Water ???

33. Density Problems What is the density of an object that has a mass of 600 grams and a volume of 350 cm 3 ? 1.71 g/ cm 3 Find the volume of gold that has a mass of 450 grams if the density of gold is 19.3 g/ml. 23.3 ml

34. Chemical Properties describes its "potential" to undergo some chemical change or reaction by virtue of its composition. Describe the capacity of a substance to undergo a change that will alter the composition of the substance

35. How do we describe Matter? Describe its properties – Characteristics Physical Properties any property that is measurable and its value describes a physical system's state.propertymeasurablephysical system's can be observed or measured without changing the composition of matter.

36. Chemical Properties: Describe the capacity of a substance to undergo a change that will alter the composition of the substance Ex. Combustible, Flammable, Able to Rust, Reacts with light, etc.