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lara31 [8.8K]
2 years ago
8

What substances are commonly formed during a chemical reaction but we can't see them?

Chemistry
1 answer:
Black_prince [1.1K]2 years ago
7 0
Maybe gas? because you can’t see it and it’s formed during a chemical reaction
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A calorimeter contains 500 g of water at 25°C. You place a hand warmer containing 100 g of liquid sodium acetate (NaAC) inside t
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The heat absorbed by the water is
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<span>ΔHf = Q / m
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A binary compound created by reaction of bismuth and an unknown element E contains 52.07% Bi and 47.93% E by mass. If the formul
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Answer:

Atomic mass of E is 128.24

Explanation:

  • The percentage composition by mass of an element in a compound is given by dividing the mass of the element by the total mass of the compound and expressing it as a percentage.
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Percentage composition of bismuth = 52.07%

Percentage composition of E = 47.93%

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Therefore,

To calculate the atomic mass of E

52.07% = 417.96 g

47.93% = ?

            = (47.93 × 417.96 ) ÷ 52.07 %

            = 384.729

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Therefore; E = 384.729 ÷ 3

                     = 128.24  

The atomic mass of E is 128.24

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The atomic number of an element indicates the number of?
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Answer:

The number is mostly related to the mass or the weight of the element.

Explanation:

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