4 years ago

What happens when uranium mixes with iodine?

Chemistry

1 answer:

Ludmilka [50]4 years ago

3 0

U + 2I₂ → UI₄ uranium (IV) iodide

2U + 3I₂ → 2UI₃ uranium (III) iodide

2UI₄ ⇄ 2UI₃ + I₂

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What is a system called when energy is exchanged between the system and the surroundings, but matter is not exchanged? A. Closed

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Answer:

A. Closed system :)

Explanation:

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3 years ago

______elements that have a longer half-life are more _______ than those that have a shorter half-life.

antiseptic1488 [7]

Answer:

Radioactive elements

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Explanation:

Radioactive elements that have a longer half-life are more stable than those that a shorter half-life.

Half-life is the time taken for half of a radioactive element to decay by half of its original composition.

Now, if a substance have a long half-life, it is more stable and takes time to break down. For atoms with a short life, they are highly unstable and breaks down readily and easily.

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3 years ago

What volume of methanol should be used to make 1.25 L of a 21.0% by volume solution

Marat540 [252]

0.2625 litres is the volume of methanol should be used to make 1.25 L of a 21.0% by volume solution.

Explanation:

Given that:

Volume of solution = 1.25 litres

methanol to be present in the composition of 21% of the volume.

To make 21 % solution by volume of a substance it means that 21 L of the substance is present in 100 L of the solution which is made upto 100 L by adding the solvent.

So, 21 L in 100 L will make 21% solution

x litres of methanol in 1.25 L of solution

So, $\frac{21}{100}$ = $\frac{x}{1.25}$