[tortoise]

I don't know if my answers are right and how to justify my classification, except (c) but I am wondering if it is right. Please help me.

(a)  coffee: an element
(b)  silver: an element.
(c)  calcium carbonate: a compound, because it can be broken down by heating to give a white solid and a gas.
(d)  ink  from  a  ballpoint  pen: a mixture
(e)  toothpaste: a mixture

Thanks in advance.

[tortoise]

2/
a)  a  soft  drink: (what is this?)
(b) water: mixture
(c)  air: a mixture of gases. It is mainly nitrogen, oxygen, argon, carbon dioxide, and water vapor.
(d)  chicken  noodle  soup: mixture
(e)  table  salt: compound.
(f ) popcorn: element?
(g) aluminum foil : en element.

[AWK]

I don't know if my answers are right and how to justify my classification, except (c) but I am wondering if it is right. Please help me.

(a)  coffee: an element
(b)  silver: an element.
(c)  calcium carbonate: a compound, because it can be broken down by heating to give a white solid and a gas.
(d)  ink  from  a  ballpoint  pen: a mixture
(e)  toothpaste: a mixture

Thanks in advance.

a - mixture

[P]

(a)  coffee: an element

So where is coffe on the peridic table then??