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ipn [44]
3 years ago
12

Which is TRUE about the structure of the atom? Select all that apply.

Chemistry
1 answer:
KATRIN_1 [288]3 years ago
4 0
A. The densest part of the atom ie the nucleus of the atom
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The chemical compound, "AB" has a molar mass of 74.548 g/mol.
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47.55%

Explanation:

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The closest star to our Sun is Proxima
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Why is a homogeneous mixture not considered a pure substance?
stepladder [879]
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3 years ago
Explain the Law of Conservation of Mass in terms of the atoms and bonds in a chemical reaction.
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Atoms are the smallest particles of an element that can take part in a chemical reaction. During any chemical reaction no particles are created or destroyed: the atoms are simply rearranged from the reactants to the products. The products may have different properties to the reactants.
Mass is never lost or gained in chemical reactions. We say that mass is always conserved. In other words, the total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.
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7 0
3 years ago
Read 2 more answers
At 60°c, the ion-product constant of water, kw, is 9.25 × 10–14 . what is the ph of pure water at 60°c ?
Rus_ich [418]

Answer:

6.517.

Explanation:

  • It is known that for pure water: [H₃O⁺] = [OH⁻], so water is neutral.  

  • It also is known that:

<em>Kw = [H₃O⁺][OH⁻] = 9.25 x 10⁻¹⁴.</em>

∵ [H₃O⁺] = [OH⁻].

∴ [H₃O⁺]² = 9.25 x 10⁻¹⁴.

∴ [H₃O⁺] = √(9.25 x 10⁻¹⁴) = 3.041 x 10⁻⁷ M.

∵ pH = - log[H₃O⁺]

<em>∴ pH</em> = - log(3.041 x 10⁻⁷) = <em>6.517.</em>

3 0
3 years ago
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