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allsm [11]
3 years ago
12

Is sand an element or a compound?

Chemistry
1 answer:
Romashka-Z-Leto [24]3 years ago
7 0
Neither

its a mixture
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The answer to this is 4.

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Which of the following could be true of two species that have a competitve ralationship in the same ecosystems Help me out pleas
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An atom gets over all positive charge by ____ _______
Rasek [7]
<h2>Answer:</h2>

Nucleus.

<h2>Explanation:</h2>
  • In an atom the nucleus has an overall positive charge as it contains the protons.
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3 years ago
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A reaction produces 0.883 moles of H₂O. How many molecules are produced?
prisoha [69]
The answer is 5.32 × 10²³ molecules

<span>Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance:
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We have 0.883 moles.
If 1 mole has </span>6.023 × 10²³ molecules, 0.883 moles will have x molecules:
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x = 6.023 × 10²³ molecules * 0.883 moles : 1 mole = 5.32 × 10²³ molecules
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