13.8 billion years ago
This relic radiation is known as the cosmic microwave background radiation. The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the universe was only 10–17 million years old.
1) An endothermic reaction is a reaction where heat is "absorbed" and the surrounding area is cooled. An example of an endothermic reaction is the classic baking soda and vinegar reaction. The mixture gets cold.
An exothermic reaction is one which gives off heat, such as burning, which is itself a chemical reaction.
2) (I don't actually know this one but i hope i helped with number one)
Answer:
191.4K
Explanation:
Using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question:
n = 4.2moles
P = 5.5atm
V = 12.0 L
T = ?
Using PV = nRT
5.5 × 12 = 4.2 × 0.0821 × T
66 = 0.345 T
T = 66/0.345
T = 191.4K
Answer:
3. I think the answer is Sulfer
