Answer:
1) Big Bang Theory
2) we are in a phase of the big bang theory
Explanation:
So for number 1 the answer is the -big bang theory- and number 2 there is a theory that pretty much says that were in a constant cycle. what I mean is theoretically in a couple million years the entire universe will form together again into another dense ball and repeat the process. So basically the universe is still in the "expanding phase" and that's what backs up the theory of the big bang (the fact that were in one of the big bang theory's "phases")
229.25 mL of isopropyl alcohol
425.75 mL of water
Explanation:
Knowing that the solution have a 35.0 % (v/v) isopropyl alcohol in water, we can calculate the volume of each component as following.
volume of isopropyl alcohol = (35/100) × solution volume
volume of isopropyl alcohol = 0.35 × 655 mL = 229.25 mL
Now, knowing the volume of isopropyl alcohol we can determine the volume of water.
volume of the solution = volume of isopropyl alcohol + volume of water
volume of water = volume of the solution - volume of isopropyl alcohol
volume of water = 655 mL - 229.25 mL = 425.75 mL
Learn more about:
percent by volume concentration
brainly.com/question/1698457
brainly.com/question/12860532
#learnwithBrainly
Answer:
Thorium-229 is a very insoluble metal that emits radioactive alpha particles. It is generated by the decay of uranium-233 and has a half-life of 7.340 years.
Explanation:
braliyest please
<u>Given:</u>
Enthalpy change ΔH for the thermite reaction = -850 kJ
Moles of Al involved = 4
<u>To determine:</u>
Reaction enthalpy when 4 moles of Al reacts
<u>Explanation:</u>
The thermite reaction is-
2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)
When 2 moles of Al react the enthalpy change is -850 kJ
therefore, when 4 moles of Al reacts, the change in enthalpy is-
= 4 moles * (-850) kJ/2 moles = -1700 kJ
Ans: Enthalpy change is -1700 kJ