The answer to your question is A.
Answer:
Pangaea
Explanation:
About 300 Million Years Ago, Earth Didn't Have Seven Continents But Instead Earth Had One Massive Super continent Called Pangaea.
Answer:
I think the answer is A. Hydrogen! hope I helped you! ^_^
Answer:
2.9g/cm^3
Explanation:
We're given that the mass of the system before the rock was added was
120g
. The mass after the rock was added was 250g, so the rock's mass is 130g.
The initial volume of water in the graduated cylinder was
30
mL
, and the volume after the rock was added read 75mL
, so the rock's volume is 45mL
Density = Mass over Volume.
AKA. 130g/45mL
2.9g/cm^3 (rounded)
Answer:
32.9%
Explanation:
<u>The mass of water </u>present in the original sample can be calculated by the substraction:
- m H₂O = sample mass before heating - sample mass after heating
- m H₂O = 8.24 g - 6.20 g = 2.04 g
The <u>percent by mass of water</u> can be calculated with the formula:
- Water Mass / Original Sample Mass * 100 %
* 100% = 32.9%
