24-25 Unit 8 lesson 4: Lab recap and quiz review

Monday UNIT 8: lab recap & quiz review

bell work (10 minutes)
announcements
Quiz review
Lab recap

Announcements/Reminders

Agenda :

Take out a pencil and workbook
Add lab data to class spreadsheet
Complete pre-lab questions on 190-191

HW

-Lab conclusion questions (pg 193)
-Quiz review

Bellwork:

• ​Don't forget to park your cell phone!

• "Souper bowl" can drive extra credit- see GC for details

• Bring in empty drink cans for this unit

• Tuesday 2/4 Quiz 1- states of matter, heating curves, heat calculations, Lab quiz AND chocolate fountain!

• Fri 2/7- PLD

• Mon 2/10 Quiz 2- gas laws

• Wed 2/12 Unit 8 test

Labelling

Identify what is occurring at each section of the heating curve​

Drag labels to their correct position on the image

vaporization

vapor heating up

solid heating up

condensation

sublimation

liquid heating up

melting

Multiple Choice

A high specific heat means...

• It heats up quickly with energy added
• It requires more energy to change temperature

Multiple Choice

The symbol for specific heat is .......

• c
• Q
• m
• t

Multiple Choice

If I heat up 2 pans of water one has 100 mL in it and one has 1000mL. Which one heats up the fastest?

• 100 mL
• 1000 mL
• They both heat up at the same speed
• They cool down.

Multiple Choice

What  is the formula to calculate heat energy required to melt or freeze any substance?

• Q=mc∆t
• Q=mHf

• Q= mHv

• m=QC

Multiple Choice

What  is the formula to calculate heat energy required to vaporize any substance?

• Q=mc∆t
• Q=mHf

• Q= mHv

• m=QC

Multiple Choice

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q=mc∆t
• Q=mc
• Q= ½mv
• m=QC

Match

Match the correct formula used to solve the problem

• How much energy (in joules) is needed to heat 25 g of water from 20°C to 80°C?

• How many joules of energy does it take to completely melt 200 g of water at 0°C?

• How much energy is released when 500 g of steam condenses into liquid water at 100°C?

q=mc∆t

q=mH_f

q=mH_v

• q=mc∆t

• q=mH_f

• q=mH_v

Multiple Choice

#1 How much energy (in joules) is needed to heat 25 g of water from 20°C to 80°C?

• 6270 J

• 4180 J

• 2090 J

• 3340 J

Multiple Choice

#2 How many joules of energy is released when 200 g of water freeze at 0°C?

• 66800 J

• 33400 J

• 41800 J

• 20900 J

Multiple Choice

#3 How much energy is released when 500 g of steam condenses into liquid water at 100°C?

• 1130000 J

• 2260000 J

• 452000 J

• 113000 J

Multiple Choice

#4 If 750 J of energy is used to heat 10 g of a substance, causing its temperature to increase by 25°C, what is the specific heat capacity of the substance?

• 3 J/g°C

• 2 J/g°C

• 1.5 J/g°C

• 0.5 J/g°C

Lab conclusion

• What happened in the lab?

• Use YOUR COPY of the class data and the instructions on page 191 to complete your graph (you can graph it on paper or in sheets).
Upload a picture of your graph to GC
Complete conclusion questions, finish for HW

You will prepare a graph from your data that includes the following information:
1. Label the x-axis with the time (in minutes). Label the y-axis as temperature (in degrees Celsius).
2. Plot your points using your recorded data.
3. Label the 5 areas on your graph: solid (S), liquid (L), gas (G), freezing point/melting point FP/MP and condensation/boiling point (CP/BP).
4. Don't forget a title!

5.What should your graph look like?

• There will be a lab quiz tomorrow- you may use pages 189-193

Lab conclusion

• What happened to the temperature as heat was added to the ice?

• What happened to the temperature as heat was added to the water?

• What happened to the temperature as the water was boiling?

• what is happening to the water molecules in the flat areas of the line on your graph during the phase changes from solid to liquid and liquid to gas?

• When the ice is melting is it releasing heat or absorbing heat?

• If you put the liquid water into the freezer and recorded its temperature as it refroze, would it be absorbing heat or releasing heat?
  
  

Multiple Choice

• What happened to the temperature as heat was added to the ice?

• increase

• decrease

• remain the same

Multiple Choice

• What happened to the temperature as heat was added to the water?

• increase

• decrease

• remain the same

Multiple Choice

• What happened to the temperature as the water was boiling?

• increase

• decrease

• remain the same

Open Ended

• What is happening to the water molecules in the flat areas of the line on your graph during the phase changes from solid to liquid and liquid to gas?

Open Ended

• When the ice is melting is it releasing heat or absorbing heat?

Open Ended

• If you put the liquid water into the freezer and recorded its temperature as it refroze, would it be absorbing heat or releasing heat?

​What should your graph look like?

Calculate the energy required to convert 50 g of ice at 0°C to steam at 100°C. (Hint: Account for melting, heating, and vaporization.)

Labelling

Identify which formula you would use for each section of the heating curve​

Drag labels to their correct position on the image

q=mHv

q=mcΔT (liquid heating)

q=mHf

q=mcΔT (solid heating)

​What should your graph look like?

Multiple Choice

#5 Calculate the energy required to convert 50 g of ice at 0°C to steam at 100°C. (Hint: Account for melting, heating, and vaporization.)

• 15000 J

• 30000 J

• 150600 J

• 300000 J

​Finish lab graph
Finish worksheet