Question

Compare solids, liquids, and gases in terms of their shape when placed into different containers

Liquids- The intermolecular attractive forces are strong enough to hold molecules close together
Liquids are more dense and less compressible than gasses, Liquids have a definite volume, independent of the size and shape of their container

solid - The intermolecular forces between neighboring molecules are strong enough to keep them locked in position, Solids are not very compressible due to the lack of space between molecules

gas-widely separated molecules. The kinetic energy of the molecules is greater than any attractive forces between the molecules
The lack of any significant attractive force between molecules allows a gas to expand to fill its container

Answer 1

Good, just mention that liquids do take the shape of their container

Answer 2

A sample of gas is in a rigid container that cannot change volume. Use the kinetic molecular theory to explain why the pressure in the container will increase as the temperature increases.

Answer 3

not sure about this

Answer 4

the pressure of a gas comes from the force exerted from the collisions of molecules against the walls of the container. higher temp --> higher molecular velocity --> higher collision frequency --> higher pressure

Answer 5

Write one or two sentences to describe how heat will flow between two objects of different temperatures that are touching.

Answer 6

If object A is hotter than object B, that means that the atoms have more energy. They are moving, colliding or simply vibrating. When object A comes in contact with object B, it will transfer the energy and set the neighboring particles also vibrating. Thus making it hot.

Answer 7

you're on the right track, just also mention that the heat is transferred until both objects are at the same temperature

Answer 8

If there are two objects, object A and object b. And for example, if object A is hotter and higher in temperature than object b, it will result in more energy. These atoms are moving and colliding with each other. The heat is transferred until both objects are at the same temperature

Answer 9

good

I'm going to make a quick commute to a new study space, I'll be back asap

Answer 10

ok

Answer 11

Write one or two sentences to compare the internal energy of a molecular gas with the internal energy of a monatomic gas.

Answer 12

For a monatomic ideal gas, each of the three directions (x, y, and z) contribute 1/2 kT per molecule, for a total of 3/2 kT per molecule... and a polyatomic gas has contributions from three translation direction and three axes of rotation, giving U = 6/2 NkT, or 3NkT."
So the polyatomic gas has more energy than a monatomic gas at the same temperature.

Answer 13

well done

Answer 14

Which states of matter include the potential energy from intermolecular forces when measuring their internal energies?

Answer 15

SOlid and liquid

Answer 16

good (I'm not sure about plasma, but I think solid + liquid would be an acceptable answer)

Answer 17

What is the average velocity of atoms in 1.00 mol of neon (a monatomic gas) at 465 K? For m, use 0.0202 kg.

Answer 18

847 m/s

Answer 19

nvm

Answer 20

What is the internal energy of 3.00 mol of diatomic oxygen gas, O2, at 288 K

Answer 21

diatomic would be (5/2)n k T I believe

Answer 22

Ugh stuck on this one

Answer 23

(5/2)nkT = (5/2)(3)(1.38064852 × 10^-23)(288) = ?

Answer 24

umm 454

Answer 25

i used mathway

Answer 26

oh whoops it's (5/2)nRT not kt

(5/2)(3.00)(8.31)(288) = ?

Answer 27

17949.6

Answer 28

good

Answer 29

Water has many unique properties. Identify a property of water and explain why this property makes water vital to living organisms.

Answer 30

high specific heat because

Answer 31

of the high heatall types of animals can use it

Answer 32

wait no how about attraction to polar molecules because

Answer 33

remember yesterday we said that water has a high specific heat which allows it to stay liquid over a high range of temperatures? can you think of why that might be important to animals?

Answer 34

This is important because even if it is cold outside animals will be able to drink good temperature water which is important for them to live

Answer 35

good

Answer 36

Write one to two sentences that summarize Bernoulli's principle.

Answer 37

Bernoulli studied fluids in pipes and found that where the speed of a fluid increases, the internal pressure in the fluid decreases. the pressure in these narrower regions decreases within the fluid as the water speeds up. Likewise, the pressure in the fluid increases as the water slows down in the wider regions.

Answer 38

good

Answer 39

. A force of 8800 N is exerted on a piston that has an area of 0.010 m^2. What is the force exerted by a second piston that has an area of 0.040 m^2?

Answer 40

pascal's equation

F1/A1 = F2/A2 find F2

Answer 41

8800/0.010m^2=F/0.040 m^2

Answer 42

good, keep going

Answer 43

140800

Answer 44

check your calculations again

just try doing 8800/0.01 = F/0.04

Answer 45

35200

Answer 46

good

Answer 47

An object's weight is equal to its buoyant force in water. What would you expect to happen when the object is placed in water? Explain your reasoning.

Answer 48

the object will sink if the force than the floating pressure

Answer 49

less*

Answer 50

there are two forces that determine whether an object floats/sinks, buoyant force and weight force, if weight force = buoyant force, the object is neutrally buoyant which means it neither sinks nor rises

Answer 51

anyway I need to start heading home, get back around 5:30 or so

Answer 52

Sounds good