Question

In the chemical formula O2, what does the number 2 mean?
AThere are 2 ozone atoms.
B:There is half an oxygen atom
C:There are 2 oxygen atoms.
D:There are 2 osmium atoms

Answer 1

@undeadknight26

Answer 2

a subscript indicates the number of atoms of that element

Answer 3

\(O_{number~of~atoms}\)

Answer 4

so a..?

Answer 5

what element is O?

Answer 6

oxygen

Answer 7

do you now know the answer?

Answer 8

i think its c

Answer 9

indeed it is.

Answer 10

Gerald's science teacher mixed room temperature samples of hydrochloric acid and sodium hydroxide in a large beaker. The solution still looked clear like water, but when the students carefully touched the beaker one at a time, it felt warm to the touch.

Why did the beaker most likely feel warm?
A:The two liquids were not soluble in water.
B:A chemical reaction was producing a new substance.
C:The energy of mixing warmed the solution.
D:The release of a gas heated the solution.

Answer 11

@aaronq

Answer 12

i think d maybe

Answer 13

Acids and bases react to neutralize each other, the reaction is exothermic which means that it releases heat as a result.

Answer 14

so d..?

Answer 15

nope, it's c. It's hard to explain why if you don't have a strong chemistry background though

Answer 16

it was b

Answer 17

weird, thats not entirely correct. I still think c is a better answer