Posted: April 26, 2020
This week you can work on a practice sheet for gas laws. You can find it in the document section of my teacher page. There are 21 questions. This will complete the gase section. Next week we work on solutions. I can do a Skype session on Wednesday at 8:00 p.m. for those who want help. Just send me your email address so I can invite you in. Submit your work for theses sheets to me by email if you are working for credit. dawn.beckingham@nbed.nb.ca
Videos were assgined last week to watch if you need a refresher. Use the formulas that were given to you. They are also found below and on the sheets themselves. You will be calculating pressure, temperature or volume of gases. Remember that:
P1V1 = P2V2 P1 ÷ T1 = P2 ÷ T2 V1 ÷ T1 = V2 ÷ T2 (P1V1) ÷ T1 = (P2V2) ÷ T2
PV = nRT n=m/M C= V/n (for gases)
R is a constant (8.31 k•PaL/mol•K)
At STP: Temperature=0°C and pressure =101.3 kPa; c = 22.4 L/mol
At STAP: Temperature= 25°C and pressure =100kPa; c = 24.8 L/mol
Temperature in the formulas for gases must be in Kelvin: Add 273 to the celcius value to get Kelvin. To change kelvin to celcius, subtract 273 for the kelvin value.
0°C = 273 K