C is correct. right now gravity holds the atmosphere so if there is no gravity then no atmospher
Answer:
I think the answer is d. Each substance in a mixture keeps most of its characteristic properties.
Answer:
<h2>2.70 g/cm³</h2>
Explanation:
The density of a substance can be found by using the formula
![density = \frac{mass}{volume} \\](https://tex.z-dn.net/?f=density%20%3D%20%20%5Cfrac%7Bmass%7D%7Bvolume%7D%20%5C%5C)
From the question we have
![density = \frac{21.6}{8} \\ = 2.7](https://tex.z-dn.net/?f=density%20%3D%20%20%5Cfrac%7B21.6%7D%7B8%7D%20%20%5C%5C%20%20%3D%202.7)
We have the final answer as
<h3>2.70 g/cm³</h3>
Hope this helps you
Exothermic reactions:
1) release heat to the surroundings
2) the change of enthalpy, ΔH, is negative: ΔH < 0
3) the temperature of the system increases
With that you can conclude about every equation given:
<span>NH3(g) + 12.0 kcal → ½N2(g) + 3/2 H2(g) : is not exothermic because heat in the side of the reactants means that heat is being used, not released.
C(graphite) → C(diamond), ΔH = - 0.45 kcal : is exothermic because ΔH is negative
C + 2S → CS2, ΔH = 27,550 cal: is not exothermic because ΔH is positive
CH4 + 2O2 → CO2 + 2H2O + 212,800 cal : is exothermic because heat appears as a product of the reaction, which means that it is released.
2H2O → 2H2 + O2, ΔH = +58 kcal : is not exothermic because ΔH is positive.</span>