**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

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percent by volume concentration

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**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**