Physical and Chemical Properties Unit 2 Lesson 7. Attendance link:

Transcription

1 Physical and Chemical Properties Unit 2 Lesson 7 Attendance link:

2 Expectations Required Class Connects Tuesday, Wednesday, Thursday 10:30 11:30 am Be active and participate in class. Be respectful to your classmates Be positive in the chat box and use it correctly Have a working microphone! You will need it during the lessons and break out rooms. If you have a question, please place it in the chat box and repost it if I don t see it.

3 Objectives Give examples of physical properties of substances. Give examples of chemical properties of substances. Differentiate physical and chemical properties of matter.

4 Properties of Matter-Words to Know

5 Matter Anything that has mass and takes up space!

6 Mass A measure of how much matter is in an object.

7 Weight A measure of the force of gravity on an object.

8 Volume The amount of space that matter occupies.

9 Density The measurement of how much mass of a substance is contained in a given volume. Mass/Volume I Density

10 States of Matter There are different states of matter. No, not like Texas, Oklahoma, New Mexico. States of matter are also known as phases (a physical state of matter). Elements and compounds can move from one phase to another phase when special physical forces are present. Solid Liquid Gas

11 Freezing point The temperature at which a liquid changes into a solid.

12 Boiling point The boiling point of an element or compound means the temperature at which the liquid form of an element or compound is at equilibrium with the gaseous form. the boiling point of water is 100 degrees Celsius.

13 Melting point The temperatures at which the solid form of the element or compound is at equilibrium with the liquid form. Basically the range at which the solid changes its state into a liquid. The melting point of water is 0 degrees Celsius

14 Face (shape, expressions) All substances have properties Example: Including people! People can be identified by their Voice Height Finger prints Eye color Hair color Teeth DNA

15 What are properties? Matter has observable and measurable qualities. We can use general properties to identify substances. Two basic types of properties of matter: Physical properties and Chemical properties:

16 Physical Properties Physical properties are used to identify, describe and classify matter. Characteristic of a substance that can be observed (using your senses) without changing the substance into something else. Hardness Texture Color Odor Taste Temperature

17 More EXAMPLES - Physical size, shape, freezing point, boiling point, melting point, magnetism, viscosity, density, luster and many more. Viscosity - The resistance of a liquid to flowing. Examples: Low viscosity-water, rubbing alcohol High viscosity-honey

18 6 properties of matter

19 If you want to ID an unknown substance: You can look at density, boiling point, thermal conductivity, and malleability. Why are the volume, length, or ability to rust not on the list of physical properties to help you ID what material you re looking at?

20 Which of these is a physical property of wood? A. Wood can rot B. Wood can burn C. Wood does not rust D. Wood is softer than coal D

21 Which of these is a physical property? A. Conducts electricity poorly B. Easy to digest C. Does not burn D. Becomes moldy quickly A

22 You are given an unknown liquid and asked to determine its identity. You can measure only one physical property. You decide to heat the liquid. You record that the liquid turns to vapor at 100 C. This demonstrates which physical property? A. Melting point B. Boiling point C. Ability to conduct electricity D. Malleability B

23 The number of outer shell electrons determines the chemical properties of an element? True or False True: it is how the valence electrons behave.

24 Chemical Properties Chemical properties are characteristics involved when a substance interacts with another substance to change its chemical make-up. Flammability Rusting Creating gas bubbles Creating a new chemical product Reactivity with water ph

25 Chemical & Physical Changes Chemical Change: A new substance is formed. Example: Wood burns an becomes ash. You can t get your wood back! Cook an egg, it will never be liquid again. Physical Changes: A change to a different state of matter. Example: Change ice to water. You can get ice back!

26 Physical Changes: Water freezes Fold a piece of paper Ice melts Chemical Changes: Metal oxidizes (oxidize = rust) Electrons form a bond Roadkill at the side of the street decomposes Burning paper

27 Chemical or Physical Change? Write a C on the chemical changes. Write a P on the physical changes.

28 Chemical or Physical Change? Write a C on the chemical changes. Write a P on the physical changes.

29 Which of these is a chemical property of iron? A. It is dense B. It has a melting point C. It is hard to bend D. It becomes rusted D

30 Which of these is a chemical property? A. Boiling point B. Flammability C. Density D. Solubility B

31 Are elements with similar chemical properties found in the same period or group on the periodic table? A. Period B. Group It is group because the all have the same number of valence electrons.

32 Which type of property can be measured w/o changing the substance into a new substance? A. Physical property B. Chemical property Physical property: does not change what the substance is; like cutting a log.

33 Property Chemical Physical Freezing point Flammability Ability to rust Hardness Solubility Malleability Density

34 Property Chemical Physical Freezing point Flammability Ability to rust Hardness Solubility Malleability Density

35 Questions? Make sure you save the whiteboard! Go complete this lesson in the OLS. Assessment is 8 questions.