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jek_recluse [69]
3 years ago
9

A loud noise was heard (a, an) hour ago.*

Chemistry
2 answers:
Salsk061 [2.6K]3 years ago
6 0
<span>A loud noise was heart an hour ago. The correct answer is the article AN. Although usually the article A is used before words beginning with a consonant, and AN before words beginning with a vowel, there are some exceptions. Here, the word hour is indeed written with a consonant as the first letter, however, it is pronounced as /ˈaʊə/, which begins as a vowel when you read it, which is why it takes the article AN.</span>
Sonbull [250]3 years ago
3 0
<span>The word that would complete the sentence, "A loud noise was heard ____ hour ago." is an. The use of "a" is for the consonant and "an" if the first letter of the word following it is even. However, the word "hour", though it starts with consonant letter , h, it is still pronounced as though it has even first letter.</span>
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hope this helps!

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When table salt (NaCl) is dissolved into water, it breaks into 2 ions, Na+ and Cl-. The water molecules are attracted to them be
eimsori [14]

Answer:

A

Explanation:

According to Coulomb's Law, like charges<u><em> repel </em></u>each other, whereas unlike charges<em><u> attract</u></em> each other. This applies to all charged particles.

When NaCl dissociates into its ions in water, we observe the following ions in the system:

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<em>Cl - (negative)</em>

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The only correct option is A where the negatively charged oxygen atoms are attracted to the positively charged sodium atoms.

In option B the charge of the oxygen atom is incorrectly mentioned as positive. In option C, the charge of hydrogen atoms is incorrectly mentioned as negative, and in option D the charges of the atoms are correct, but the pairing is incorrect as like charges repel each other.

<h3>Hope this helps</h3>
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3 years ago
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