Density and Specific Heat Notes / Lesson

Density and Specific Heat Notes / Lesson

Density

• What is density?

• Add the information from the video to your notes

• Then answer the questions

Multiple Choice

How is density measured?

• mass / volume

• volume / mass

• volume x mass

• mass x volum

Multiple Select

What color is the most dense?

• red

• yellow

• blue

• orange

Multiple Select

Approximately What is the density of water?

• 1 g/cm3

• 4.184 g/cm3

• 0.5 g/cm3

• 124 g/cm3

Density of liquid water is 1 but.....

Depends upon temperature and air pressure, the colder the water the less dense it is until it freezes . . . the hotter the water the less dense it is until it evaporates

Need to see some examples done using density

• a couple examples worked through

• Write down some appropriate notes

Fill in the Blanks

What is the density of CO gas if 0.196 g occupies a volume of 100. ml?

Fill in the Blanks

A block of wood 3.0 cm on each side has a mass of 27 g. What is the density of the block? (Hint, don’t forget to find the volume of the wood.)

Fill in the Blanks

An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2.0 mL. The height of the water rose to 7.0 mL. If the mass of the stone was 25 g, what was its density?

You should

have completed your density notes

and completed your density worksheet from class

send both to your teacher over e mail

Specific Heat

• What is specific heat?

• Take notes on the video

Multiple Choice

What is the formula for specific heat?

• 
  

  $q\ =m\ c\ \Delta T$

• $m\ =\ q\ c\ \Delta T$

• $\Delta T\ =\ m\ c\ q$

• $c\ =\ m\ q\ \Delta T$

Multiple Choice

The higher the specific heat the

• more energy needed to raise the temp

• less energy needed to raise the temp

• it doesn't matter

How to use the specific heat formula

take the appropriate notes

write down some example please

then try the examples in the following slide

Fill in the Blanks

Gold has a specific heat of 0.129 J/(g×°C). How many joules of heat energy are required to raise the temperature of 15 grams of gold from 22 °C to 85 °C?

Fill in the Blanks

If the temperature of 34.4 g of ethanol increases from 25 °C to 78.8 °C, how much heat has been absorbed by the ethanol? The specific heat of ethanol is 2.44 J/(g×°C)

Fill in the Blanks

An unknown substance with a mass of 100 grams absorbs 1000 J while undergoing a temperature increase of 15 °C. What is the specific heat of the substance (in J/g^oC)?

What you should have done

• finished your notes on Specific Heat

• Finished your Specific Heat WS from class

• E mail both to your teacher