Question

Which of these substances are elements?
more than 1 answer
1.silicon
2.lead
3.silicone
4.water
5.iodine
6.quartz

Answer 1

hi @stephstar101 :D

Answer 2

it's like no one in this chemistry section wow... :(

Answer 3

1, 2, and 5 are elements; the others are compounds (silicone is synthetic, but water and quartz are natural) :D Hey there @Ala123!

Answer 4

i thought water was element :(

Answer 5

and how can you tell the differences between elements and compound ?

Answer 6

Nope, it's covalently bonded! H2O is the molecule. Elements are purely one "element" while compounds/molecules are made up of elements.

Answer 7

ohh ok !

Answer 8

thanks alot !

Answer 9

i have some other questions as well if you don't mind answering them here ?

Answer 10

is brass a heterogeneous ?

Answer 11

I believe brass is a homogeneous mixture. You can't tell apart the tin and the copper.

Answer 12

oh i see, what about oil and water, that should be hetero right ?

Answer 13

Water and oil are not elements, but they are made from elements. They are combinatins of elements. Water is H2O. So, 2 Hydrogen atoms and 1 oxygen atom.

Answer 14

1,2 and 5 are elements. That's it.

Answer 15

yeah what about oil and water? is it heterogeneous ?

Answer 16

Heterogenoeous what? Mixture?

Answer 17

yeah

Answer 18

Remember, heterogeneous means that you can see different parst. Example: Crunchy peanut butter. You can see the peanuts, while oil and water are homogeneous because you can't see different parts to it. It looks like one, even though has more than one thing in it. Make sense?

Answer 19

@Ala123 Do you understand?

Answer 20

yes in understand thanks!

Answer 21

Yes, no problem.