Temperature + Density

What is the SI unit for temperature?

Kelvin, K

What temperature scale starts at absolute zero?

Kelvin

What is absolute zero in Kelvin?

0 K

At 1 atm, water freezes at what Celsius temperature?

0°C

At 1 atm, water melts at what Celsius temperature?

0°C

At 1 atm, water boils at what Celsius temperature?

100°C

At 1 atm, water condenses at what Celsius temperature?

100°C

A temperature is given in Celsius and the answer needs Kelvin. What operation should you do?

Add 273.15

Convert 65°C to Kelvin.

338.15 K

Convert 25°C to Kelvin.

298.15 K

Convert 0°C to Kelvin.

273.15 K

Convert 100°C to Kelvin.

373.15 K

A temperature is given in Kelvin and the answer needs Celsius. What operation should you do?

Subtract 273.15

Convert 300 K to Celsius.

26.85°C

Convert 273.15 K to Celsius.

0°C

Convert 373.15 K to Celsius.

100°C

A temperature is given in Celsius and the answer needs Fahrenheit. What formula pattern should you use?

Multiply by 9/5, then add 32

Convert 37.2°C to Fahrenheit.

98.96°F

Convert 0°C to Fahrenheit.

32°F

Convert 100°C to Fahrenheit.

212°F

A temperature is given in Fahrenheit and the answer needs Celsius. What should you do first?

Subtract 32

Convert 63°F to Celsius.

17.2°C

Convert 63°F to Kelvin.

290 K

Convert 32°F to Celsius.

0°C

Convert 212°F to Celsius.

100°C

A problem asks for density and gives mass and volume. What do you divide?

Mass divided by volume

A sample has a mass of 25 g and a volume of 5 mL. What is its density?

5 g/mL

A sample has a mass of 50 g and a volume of 10 cm³. What is its density?

5 g/cm³

A liquid has mass 18 g and volume 6 mL. What is its density?

3 g/mL

A problem gives density and volume and asks for mass. What operation should you use?

Multiply density by volume

A liquid has density 0.79 g/mL and volume 100 mL. What is its mass?

79 g

A solution has density 1.25 g/mL and volume 20.0 mL. What is its mass?

25.0 g

A problem gives mass and density and asks for volume. What operation should you use?

Divide mass by density

A solution has mass 25 g and density 4.23 g/mL. What is its volume in mL?

5.91 mL

A solution has mass 25 g and density 4.23 g/mL. What is its volume in L?

0.00591 L

A substance has density 2.50 g/mL and mass 10.0 g. What is its volume?

4.00 mL

Density is the amount of mass in a unit of what?

Volume

What are common density units for liquids and solids?

g/mL or g/cm³

What is a common density unit for gases?

g/L

What is the relationship between 1 mL and 1 cm³?

1 mL = 1 cm³

If temperature changes, can density change too?

Yes

Why does density count as a physical property?

It can be measured without changing the substance into a new substance

If two samples are the same substance at the same temperature, should they have the same density?

Yes

If mass increases but volume stays the same, what happens to density?

Density increases

If volume increases but mass stays the same, what happens to density?

Density decreases

If a density problem’s units do not cancel to the unit asked for, what probably happened?

The formula or conversion setup is wrong