Chemistry: (3) States of Matter (unit one) Test

• pressure increases as volume decreases
• smaller space=more collisions

As temp increases, pressure increases.

temp rises= more KE= more collisions= more pressure

As temp of gas increases, volume of gas increases.

In hot air balloons, the volume increases but not the mass. Since density is a ratio of volume and mass, (M/V=D), when volume increases and mass stays the same, density decresases and the hot air balloon will rise above the more dense air outside. To increase the volume and not the mass, heat up the gas inside the balloon.

The collision of particles

1 atm, 760 mmHg or 101.3 kPa

It decreases

There is low pressure inside a vaccuum, so the higher outside pressure pushes things into the vaccuum cleaner. "Nothing sucks in chemistry"

The energy needed to raise/lower 1 gram of a substance 1 degree Celsius

No. Only once a phase change has occured completely will a temp change. 0 degree ice melts into 0 degree water.

to break or form intermolecular attractions

intermolecular forces

stronger intermolecular attractions

as temperature increases, vapor pressure increases

• Evaporation- particles at the surface change to gas and leave the container
• Vapor pressure- particles turn to gas and are trapped in container, so pressure builds up as the hit walls of container and each other

When vapor pressure equals atmospheric temperature

cooling

• The particles with the most KE leave the container (skin)
• Particles left behind have lower KE/ temp

Steam because once water reaches 100 degress celsius it cannot get any hotter. Steam gets much hotter.

KE= 1/2mv²

• Yes.
• Ex) Water at 25 degrees celsius and copper at 25 degrees celsius have the same KE.

• takes up space
• has mass

The amount of matter in an object

Lwh

(pi)(r²)(h)

liquid displacement

Convert temperature to Kelvin!

• 1) The steam's heat is transferred to the solid
• 2) The steam changes to water
• 3) Particles slow down= less KE= less pressure and temperature

• 1) heat up bag
• 2) decrease size of bag
• 3) increase amount of particles in bag