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hodyreva [135]
3 years ago
6

For which of the following activities might you want to hire a chemist?

Chemistry
2 answers:
Basile [38]3 years ago
7 0

Answer:

OPTION (A) : Testing a rock sample for gold content

Explanation:

For testing a rock sample of gold content you will need a Chemist. To test the material, the sample is rubbed on black stone which will leave a mark on the stone. This mark is tested by applying aqua fortis i.e nitric acid on the mark. If the mark gets dissolve then the material is not gold. If the mark sustain the it is further tested by applying aqua regia i.e nitric acid and hydrochloric acid which will prove the sample is of gold if it gets dissolve on using hydrochloric acid. The purity of the sample can be checked by differing the concentration of the aqua regia and comparing it with the gold material of the known purity.

valentinak56 [21]3 years ago
6 0

Answer:

Testing a rock sample for gold content

Explanation:

done the topic

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On the pH scale pure water has a pH of<br> A. 0<br> B. 7<br> C. 14
konstantin123 [22]

Answer:its b 7

Explanation:

7 is neutral and pure water is the middle man

7 0
3 years ago
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The product of alpha decay of the Nobelium isotope 259No is
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Answer:

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Explanation:

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3 years ago
Write the symbol for every chemical element that has an atomic number less than 13 and atomic mass greater than 19.3 u
emmainna [20.7K]

Answer:

The symbol of each element is, Ne, Na, Mg, and Al.

Explanation:

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The atomic mass of Sodium is 22.989769 u and the atomic number is 11.

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3 0
3 years ago
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asambeis [7]
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1. Una onda tiene una longitud de onda de 2 metros y una frecuencia de 1.5 Hz. ¿Cuál es su velocidad?
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Explanation:

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