Question

When a helium balloon rises in the air, it expands. If the volume of the balloon doubles, what happens to the density of the helium inside it?
A.

The density stays the same.

B.

The density triples.

C.

The density decreases by half.

D.

The density doubles.

Answer 1

what's the formula connecting density and volume? do u know it?

Answer 2

\[density = mass \div volume\]

Answer 3

okay, lets do an example for u to get to the answer okay? @it_meh_miranda

Answer 4

yeah it d=m divided by v and ok

Answer 5

cool
lets say
your volume is 5cm3 and your mass is 10 kg

Answer 6

whats ur density?

Answer 7

2

Answer 8

okay good
now ur volume is doubled, 5*2= 10cm3 and ur mass is same 10kg

Answer 9

whats ur density now?

Answer 10

so 1

Answer 11

so, we doubled volume, what happened to density?

Answer 12

it doubles too?

Answer 13

it was 2 but now its 1

Answer 14

wait no

Answer 15

so?

Answer 16

so it decreases by half

Answer 17

bingo! :)

Answer 18

lol thx

Answer 19

you are welcome :) @it_meh_miranda

Answer 20

i got more do u still want to help?

Answer 21

oh well sure) let's see if i can)

Answer 22

Which statement best describes volume?

A.

the measure of the amount of matter in a given space

B.

the measure of the amount of pull exerted on an object by a gravitational field

C.

the measure of the amount of matter in an object

D.

the measure of the amount of space that an object occupies

Answer 23

what's the formula of volume?

Answer 24

um v=m divided by d right? i forget it sry its been awile

Answer 25

volume= height*area

Answer 26

oh yeah

Answer 27

if u look at formula, what do u think it represents? what does it talk about?

Answer 28

rather what does it tell u?

Answer 29

it tell u that to find the volume u have to multiply the height by the area i think

Answer 30

no no, i meant what does it tell u about

Answer 31

does it tell u about matter?

Answer 32

um idk sry im not good at science im stupid when it comes to it

Answer 33

no no don't say that

Answer 34

height and area is not matter is it?

Answer 35

that means volume does not give u any info about matter, do u agree to it?

Answer 36

yeah

Answer 37

so which options can u get rid off

Answer 38

of*

Answer 39

A, B, C, D
which of them talk about matter?

Answer 40

A and C

Answer 41

good job! so u r left with B and D
now which one to u think is ur right answer?

Answer 42

um D?

Answer 43

bingo! :) why not B?

Answer 44

it just doesnt sound right to me

Answer 45

B is about force, but volume doesn't give anything to do with force :)

Answer 46

that's why i'd choose D

Answer 47

since height and area are about amount of space :)

Answer 48

yeah

Answer 49

How is density calculated?
A.

It is calculated by length times width times height.

B.

Mass multiplied by volume.

C.

Mass divided by volume.

D.

The amount of water displaced.

Answer 50

u tell me this now

Answer 51

look at previous questions u asked and u'll get it

Answer 52

C

Answer 53

see) good job)

Answer 54

lol thx when i saw the question after i put it up i remembered we already did that

Answer 55

heh you are welcome :) @it_meh_miranda

Answer 56

:D