some basic stuff

Question 1

Explain how density varies in solids, liquids, and gases.

Answer 1

bcs both solids and liquids have fixed volumes, their densities are constant. but not for gases, their volume can be altered by changing the size of the container, so their density changes.

Question 2

Instrument used to measure pressure (units for pressure)

Answer 2

• Barometer and manometer.

760 torr = 760mmHg =1 atm

Question 3

define Energy, it’s measuring equipment and SI units

Answer 3

• is the ability to do work or transfer heat
• measured in cal = 4…. J
• By calorimeter.

Question 4

define temp

Answer 4

• is the average kinetic energy of molecules in a sample
• rem: temp is a reflection but not a direct measure of heat content. Heat content is not measured in degrees but in joules, kJ, and cals.

Question 5

Specific heat capacity defin and it’s effects on temp

Answer 5

• is the amount of heat needed to increase the temp of 1 gram of a substance by 1 degrees celcius.
  As a result substances with diff heat capacity will need different amount of energy to increase their temp.

Question 6

relationship btn mass and atoms

Answer 6

• it varies with the number of molecules and atoms in the substances.
  more atoms and molecules = more mass