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4 years ago

A) 3 and 4 b) 2 and 3 c) 1 and 2 d) 1 and 4

Chemistry

1 answer:

tatiyna4 years ago

4 0

<h3>Answer:</h3>

d) 1 and 4

<h3>Explanation:</h3>

Elements are made up of particles known as atoms.
Atoms of the same element have the same properties as the element.
The atoms of an element may differ in terms of the number of neutrons and have a different mass number, such atoms are known as isotopes.
However, the isotopes have an equal number of protons or atomic number.
In this case, atom 1 has a mass number of 20 and an atomic number of 10 while atom 4 has a mass number of 21 and an atomic number of 21.
Therefore, atom 1 and 4 are isotopes of element E.

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andreev551 [17]

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4 years ago

Which of the following solutions contains the largest number of moles of dissolved particles? a.) 25 ml of sodium chloride b.) 2

kirza4 [7]

Answer:

b.) 25 ml of aluminum hydroxide

Explanation:

For this question, we have to assume that we have the same concentration for all the solutions, for example, 1 M. Additionally, we have to take into account the ionization reaction for each species:

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If we have the same volume and the same concentration the variables that will help us to answer the question would be the number of ions. If we have more ions we will have more particles dissolved. Therefore the answer would be b) (due to the fourth ions).

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3 years ago

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3 years ago

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4 years ago