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Nadusha1986 [10]
3 years ago
10

Which is the most important question for deciding if a chemical reaction has occurred

Chemistry
2 answers:
cluponka [151]3 years ago
6 0
A chemical reaction undergoes a chemical change so the question you should ask if a chemical reaction has occurred is "Did a chemical change happened?". Chemical change in a reaction happens when you see bubbles, when the reaction increases or decreases in temperature or a precipitate is formed.
anastassius [24]3 years ago
4 0

Answer:

the answer is Was there any heat energy given off?

Explanation:

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When a paper towel absorbs water, is it a physical or chemical change?
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It is a physical change.

Explanation:

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How many grams of KBr are contained in 150. mL of a 0.154 M solution of potassium bromide?
Lostsunrise [7]

Answer:

I think it is B

Explanation:

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What is the formula for frequency?
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3 years ago
How many atoms are in 8.28 moles of aluminum?
Lilit [14]

Answer:

49.86 × 10²³  atoms of Al

Explanation:

Given data:

Number of moles of Al = 8.28 mol

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

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For 8.28 moles of Al:

1 mole = 6.022 × 10²³  atoms of Al

8.28 mol×6.022 × 10²³  atoms / 1mol

49.86 × 10²³  atoms of Al

4 0
3 years ago
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