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chemistry > test unit 2 > Flashcards

test unit 2 Flashcards

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1
Q

pressure equation

A

p= f/a

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2
Q

pressure

A

force exerted over an area

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3
Q

diffusion

A

the process of particles moving from high to low concentration

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4
Q

draw diffusion particles diagrams

A

check US

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5
Q

what do collisions do?

A

transfer energy and alter direction

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6
Q

Compraing solids liquids and gases

A

strongest attraction, weaker, weakest
most dense, less, least
rigid, fluid, fluid
definite shape, no, no
definite volume, yes, no
moves slowest, faster, fastest
most organized, less, least

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7
Q

particles diagrams for solid, liquid, gas

A

check US

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8
Q

what does Eth mean

A

thermal energy!!

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9
Q

practice PVT problems

A

do it

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10
Q

whats standard temp

A

273 K

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11
Q

what does directly proportional graph look like

A

draw it

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12
Q

what does inversely proportional graph look like

A

draw it

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13
Q

what does not proportional graph look like

A

draw it

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14
Q

comparing directly, inversely, and not proportional graphs

A

goes through origin, does not, does not
linear, curve, linear
has same ROC (slope), not a straight line, no

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15
Q

directly proportional equation(s)

A

P/n=K(constant)
P/kelvin=K
P/inverse volume=K
V/Kelvin=K

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16
Q

inverse proportional equation(s)

A

PV=K

17
Q

not proportional equation(s)

A

anything to do with celcius

18
Q

What is kinetic molecular energy and what are the basic tenets of it?

A

moving lumps of stuff theory
1) all matter is made of atoms that are really small and constantly moving
2) all movement is random
3) when atoms collide there is no energy lost
4) attractions pull things together, repulsions push things apart

19
Q

manometer is used to

A

compare the pressure of gas to air pressure

20
Q

how to do manometer questions

A

know how to draw j incase
gas is wherever the bubble is
subtract gas and air
if gas greater than air: add the air pressure and differences
if air greater than gas: subtract the air pressure and differences

21
Q

barometer

A

measures air pressure

22
Q

be able to draw a barometer

A

maybe

23
Q

what happens to particle motion when energy is added

A

particles speed increase

24
Q

describes the process of how the arrangement of particles changes during phase changes

A

as phase changes occur, particles either spread out and become less organized or condense and become more organized

25
Q

Explain at the particle level how a thermometer measures the temperature of a system. Draw particle diagrams to support

A

the thermometer says if something is thermally expanding or contracting based on the heat of the substance the thermometer is being put it.
when in warmer a substance, energy from substance is transferred into the alcohol of the thermometer causing thermal expansion so can see what mark the alcohol in the thermometer is at.
when in cooler substance, energy from alcohol in thermometer is transferred into the surround substance thermometer is in causing thermal contraction can see what mark the alcohol in the thermometer is at.

26
Q

How the Celsius temperature scale was developed

A

Celsius Put liquid mercury in a test tube at room temperature and put it in freezing cold water and then when it froze he marked it as 0 degrees celsius. then he put the test tube in boiling hot water and when the liquid mercury boiled boiled he marked the temperature at 100° C

27
Q

How a barometer works

A

In a barometer there’s mercury in a beaker and then a tube in the beaker and when air pressure pushes down on the Mercury the tube goes up

28
Q

Barometer on hot versus cold days

A

on hot days tube of tube is pushed up
On cold it is not

29
Q

Explain the basis for the Kelvin scale what is absolute temperature

A

The basis for the Kelvin scale is 0° Kelvin, which is absolute zero( the coldest temperature a molecule can be and has no thermal energy) absolute temperature is when the temperature is at Absolute Zero like I just described)

30
Q

how to convert from celsius to kelvin temp

A

add 273 to the Celsius

31
Q

Pressure and volume particle diagrams and explain
low vs. high pressure

A

LOW
because there is less force exerted on the particles, and thus, a larger area for the particles to collide in, there are less collisions happening creating less or lower pressure

HIGH
Because there is more force being exerted on the particles, and thus, a smaller area for the particles to collide in, there are less collisions happening between particles which creates a lower pressure

32
Q

what causes pressure

A

collisions!

33
Q

Pressure and number of particles particle diagram and explain
low vs. high pressure

A

LOW
Because there are only 5 particles in this diagram, they are more dispersed and thus haves less collisions and less force which creates a lower pressure

HIGH
Because there are 11 particle sin this diagram, more force is being created because there are more collisions; thus, pressure is increasing to higher pressure

34
Q

Pressure and temp. particle diagram and explain
low vs. high pressure

A

LOW
bc the temp is lower, the particles are moving at a slower pace, thus, less collisions are occuring creating less force and a lower pressure

HIGH
bc the temp is higher, the particles are moving at a faster pace, thus, more collisions are occuring which means there is a higher force and thus a higher pressure

35
Q

What variables are directly proportional

A

pressure and number of particles
pressure and kelvin temp
pressure and inverse volume
volume and kelvin temp

36
Q

What variables are inversely proportional

A

pressure and volume

37
Q

What variables are inversely proportional

A

anything with celsius

38
Q

Draw particle diagrams based on densities of two substances (how)

A

whichever substance is more dense

chemistry (10 decks)

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