Question

#1: Which of the following is a homogenous mixture of two or more pure substances?
A. water
B. air
C. alcohol
D. oxygen
**MY answer: B. air

#2: You run a chromatogram of inks belonging to three crime suspects and from a ransom note. The inks resolve into the following numbers of spots: suspect A = 2, suspect B = 4, suspect C = 3, note = 5.

Which suspect would you most likely bring in for questioning?

A. suspect A

B. suspect B

C. suspect C

D. none of the suspects
**My answer: D. b/c note=5 and none of the suspects = 5...

Answer 1

#3: Which of the following is a chemical property?

A. ability to react with oxygen

B. ability to become magnetic

C. ability to conduct electricity

D. ability to conduct heat
**Idk this one :(

Answer 2

do #1 and #2 look right?? :)

Answer 3

1 is right.. 2 could be be right, but there could always be errors in tests so i would say run it again ahha but yeah D is probably right.

Answer 4

so yes? #1 and #2 are right??? :)

Answer 5

yep, although 2 is kinda shifty, but technically right.

Answer 6

okay, what about #3?? idk :(

Answer 7

number 3.. how do i explain this one..

Answer 8

okay conducting heat, if you hold a cup of hot water and you feel the heat transferring through the cup, is that physical or chemical?

Answer 9

physical?

Answer 10

yep!

Answer 11

now if you hold a fork and stick it into a light socket, the ability for electrons to travel through the metal, is that physical or chemical?

Answer 12

chemical?

Answer 13

a chemical change constitutes of breaking or forming bonds..

Answer 14

don't get confused just because i said electrons.

Answer 15

so physcial?

Answer 16

haha okay :)

Answer 17

haha you're right its physical, but do you understand why? its just like transferring heat, the metal serves as a conductor but it's not changed

Answer 18

become magnetic, do you now what magnetism is?

Answer 19

yeah i do,, its just transferred but not changed... and magnetism? is it when they feel a connection? like magnets to a fridge? lol ;P

Answer 20

haha jk, idk really :P

Answer 21

a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.

official dictionary definition :)

Answer 22

go magnetism :)

Answer 23

so this is physical right?? cuz magnetism does not result in a change??

Answer 24

^^
for not go lol :P

Answer 25

haha yeah fridge magnets are a good example. there are several types of magnetism.. lets just talk about paramagnetism and diamagnetism.

paramagnetism is a property of substance when electrons are unpaired in "orbitals" (think of boxes where electrons are kept within an atom's radius, although this is a gross simplification) and thus are attracted to a magnetic field. so this means that it will want to stick to another magnetic substance. (fridge magnet)

diamagnetism is the opposite, it repels the magnetic field. it has no unpaired electrons.

idk if you've ever played with a magnet, but it has poles, meaning one side is paramagnetic and one side is diamagnetic.

sooo is the arrangement of electrons a physical or chemical property?

e.g. if you rearrange the chairs in your living room to play musical chairs, are you changing the chairs themselves?

Answer 26

you're right it's physical

Answer 27

so my answer to #3 is this??

A. ability to react with oxygen

???

Answer 28

yep! reacting with other substances usually means breaking or forming bonds

Answer 29

yay! thx

Answer 30

woooooo