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Anvisha [2.4K]
2 years ago
13

How to combine elements to make compounds?

Chemistry
1 answer:
zavuch27 [327]2 years ago
6 0
Elements combine<span> to </span>form<span> chemical </span>compounds<span> that are often divided into two categories. Metals often react with nonmetals to </span>form<span> ionic </span>compounds<span>. These </span>compounds<span> are composed of positive and negative ions formed by adding or subtracting electrons from neutral atoms and molecules.</span>
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What is Avogadro's number, and why is it useful? (3 points)
SashulF [63]

Answer:

6.022 x 10²³; it is a conversion factor between moles and number of particles

Explanation:

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

1.008 g of hydrogen = 1 mole of hydrogen  = 6.022 × 10²³ atoms of hydrogen

238 g of uranium = 1 mole of uranium = 6.022 × 10²³ atoms of uranium

By taking ions:

62 g of NO⁻₃ =  1 mole of  NO⁻₃  = 6.022 × 10²³ ions of  NO⁻₃

96 g of SO₄²⁻ = 1 mole of SO₄²⁻ =  6.022 × 10²³ ions of  SO₄²⁻

4 0
3 years ago
The reaction of iron ore with carbon follows the equation: 2 Fe2O3 + 3 C 4 Fe + 3 CO2.
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Answer:

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Explanation:

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Alina [70]
C is the correct answer
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