Solids, Liquids and Gases Flashcards
Why is it important to have control variables?
1) so you know which factor mattered
2) other wise not fair test so results would not be reliable
Explain how Brownian motion provides evidence that air is made of small particles
1) smoke particles
2) move with random motion
3) collisions with smaller invisible particles
What is Boyle’s Law?
1) For a fixed mass of gas at constant temperature, the product of the pressure multiplied by the volume is constant
2) p1 x V1 = p2 x V2
Explain how air in a container can exert a pressure
1) continuous random movement of particles
2) collision with walls of the container
3) force is produced by bombarding molecules
4) pressure is a force on an area
Explain why air pressure decreases as altitude increases
1) atmospheric density decreases as height increases
2) depth from top of atmosphere decreases
3) temperature of air is colder so particles move more slowly
What does mega mean?
One million of a value (1 MHz = 1,000,000 Hz)
How do you determine the volume of an irregular shape?
Measure volume of water displaced when fully immersed in water with a eureka beaker/displacement can
What is a pascal?
1 N/m2
What can be said of the pressure at a point in a gas or liquid at rest?
It acts equally in all directions due to the random movement of particles
What is absolute zero?
-273 C
How do you transfer from Degrees Celsius to kelvins?
Add 273
What is the relationship between pressure and temperature for a gas at a fixed volume?
p1 ÷ T1 (in KELVINS) = p2 ÷ T2
p1V1 =?
p2V2
Why is the water level straight in containers of different shapes connected together?
1) vessels are connected
2) same density of liquid in all
3) air pressure is the same for all
4) pressure only depends on the depth
Why do you take loading and unloading results in an experiment?
1) make results more reliable
2) produce average reading
3) identify anomalous results
