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3 years ago

What is responsible for the whistling sound that often accompanies fireworks?

1 answer:

6 0

The crackling sound Is mainly to do with chemistry, The fireworks are filled with lead oxide, which turns into lead atoms as the firework explodes and heat up—— whistling sounds, the whistle is down to the tube being narrow one, thus rockets make a whistling noise

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Is a group of deer in a field called a community or a population?

timofeeve [1]

Answer:

Explanation:

6 0

3 years ago

Read 2 more answers

A hydrate is a compound that has water molecules within its crystal structure. Magnesium sulfate heptahydrate, MgSO4·7H2O, is a

Alenkasestr [34]

Answer:

We are heating the sample repeatedly to become a pure compound of only MgSO4 (withot H2O) and a constant mass.

Explanation:

Step 1: Data given

Mass of MgSO4·7H2O = 5.06 grams

The remaining MgSO4 had a constant mass of 2.47 grams.

Step 2: Explain why the sample in the crucible was heated repeatedly until the sample had a constant mass.

Before heating the compound has magnesium sulfate and water.

The total mass of this compound is 5.06 grams

By heating we try to eliminate the water.

After heating there remain mgSO4 with a mass of 2.47 grams

This means 5.06 - 2.47 = 2.59 grams is water. All of this is eliminated.

The heating process happens repeatedly to make sure the final compound is pure. So the 2.47 grams os only MgSO4. If the mass would not be constant. It means the compound is not pure, the not all the water is eliminated yet.

So we are heating the sample repeatedly to become a pure compound of only MgSO4 (withot H2O) and a constant mass.

4 0

3 years ago

73.5 mol of P4O10 contains how many moles of P ? moles of P:

Sholpan [36]

Answer:

294 moles of P

Explanation:

For every 1 mol of P4O10 contains 4 mol of P

so;

73.5 mol P4O10 × 4 mol P

1 mol P4O10

= 73.5 × 4

= 294 moles of P

7 0

2 years ago

AKALI METALS ARE HIGLY_______ SINCE THEY ______ easily to form ions. HELP ASAP

kvv77 [185]

Answer:

Reactive and lose 1 electron

Explanation:

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3 years ago

When does the object change direction?

Tatiana [17]

Answer:

50distance and 10minutes time

Explanation:

because it's the best object

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3 years ago