Properties of Gases in Grade 8 Science.pptx

This is a power point in science 8 topic.

1. GOOD AFTERNOON!

2. CLASSROOM RULES 2 1 No one is allowed to eat, drink, and go outside while the teacher is teaching. 2 Once you entered the classroom, please observe silence at all times. 3 Actively participate in class discussions and activities. 4 Raise your hand and wait to be acknowledged before speaking.

3. PROPERTIES OF

4. LEARNING OBJECTIVES 2 At the end of 1-hour lesson, the students should be able to: 1. State the properties of gases; 2. Calculate conversion problems involving the volume and pressure; and 3. Apply the importance of conversion into real life situation

5. VOLUME One of the measurable properties of gas, is denoted by the symbol V. It is the amount of space occupied by a gas sample.

6. INTERNATIONAL SYSTEM OF UNITS (SI) FOR VOLUME (V) Liters (L) milliliters (mL) cubic centimenter (cm^3) cubic meter (m^3) cubic decimeter (dm^3)

7. SAMPLE CONVERSION How many liters (L) are in 1200 milliliters (mL) of water in a bottle? mL L 1000mL = 1L Solution: 1200 mL to L 1200 mL 1L 1 1000mL × = 1.2 L

8. SAMPLE CONVERSION How many milliliters (mL) are in 0.25 liters (L) of water in a bottle? L m L 1L = 1000mL Solution: 0.25 L to mL 0.25 L 1000mL 1 1L × = 250mL

9. PRESSURE It is the next important measurable property of the gas, which is denoted by the symbol P. Pressure of the gas is the force exerted by the gas per unit area. In equation: Pressure (P) = force (F) / area (A)

10. INTERNATIONAL SYSTEM OF UNITS (SI) FOR PRESSURE atmosphere ( atm ), millimetre of mercury ( mmHg ). Torr bar kilopascal ( kPa ) pounds per square inch ( psi )

11. SAMPLE CONVERSION The air pressure for a certain tire is 109 kPa. What is this pressure in atmospheres? 101.325 kPa = 1 atm Solution: 109 kPa to atm 109 kPa 1 atm 101.325 kPa × = 1.075 atm or 1.08 atm kpa atm

12. SAMPLE CONVERSION The air pressure inside a submarine is 0.5 atm. What would be the height of a column of mercury balanced by this pressure? 1atm = 760 mmHg Solution: 0.5 atm to mmHg 0.5 atm 760 mmHg 1 atm × = 380 mmHg atm mmHg

13. SAMPLE CONVERSION The air pressure inside a submarine is 960 mmHg. What would be its value in atm ? 760 mmHg = 1 atm Solution: 560 mmHg to atm 960 mmHg 1 atm 760 mmHg × = 1.26 mmHg atm

14. TEMPERATURE The temperature is denoted by the letter T . The temperature of a gas depends on its kinetic energy. Gases expand when the temperature is increased. The temperature of gas is expressed in Fahrenheit (°F) , Centigrade or Celsius (°C), and Kelvin (K) .

15. CONVERSION FORMULAS Fahrenheit to Celsius °F °C °C = ( ° F-32) ×   Celsius to Fahrenheit °F °C °F = °C ( ) + 32   Kelvin to Celsius K °C °C = K - 273 Celsius to Kelvin °C K K = °C + 273

16. AMOUNT OF MOLES (MASS) The amount of gas (or mass) is another measurable property of gas. The mass of the gas is related to its number of moles and is generally expressed in kilogram (kg) or gram (g) . Number of moles = mass of the gas/molar mass of the gas In symbols, n = m /M

17. CONVERSION FORMULAS n = m / M Number of moles = mass of the gas/molar mass of the gas Moles to grams ( multiply moles to molar mass ) Grams to moles ( divide grams to molar mass )

18. BOARK WORK!

19. ACTIVITY TIME! Convert the following: Calculate the mass in grams of 120 moles of Ag. Calculate the number of moles found in 250 grams of S₂Cl ₂.

20. THANKS YOU FOR