2 years ago

Which of the following materials fall in the category of a ‘‘pure substance’’?

1 answer:

6 0

Answer:

1) Ice, iron, calcium oxide and mercury are pure substances since they contain particles of only one kind of matter.

2) In contrast, milk, hydrochloric acid (hydrogen chloride gas dissolved in water), brick and air cannot be called pure substances because they consists of particles of more than one kind of matter.

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JulijaS [17]

Answer:

2. A

3.B

4.B

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3 years ago

Which of the following would result in decreased entropy?

maria [59]

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3 years ago

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In the equation:

Ksenya-84 [330]

Answer:

B) 16 g

Explanation:

2H₂ + O₂ → 2H₂O

First we convert 4 moles of O₂ into moles of H₂, using the stoichiometric coefficients of the balanced reaction:

4 mol O₂ * $\frac{2molH_2}{1molO_2}$ = 8 mol H₂

Finally we convert 8 moles of H₂ into grams, using its molar mass:

8 mol H₂ * 2 g/mol = 16 g

Thus, the correct answer is option B).

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3 years ago

Mention the reason why aquatic plants have air filled tissues.

Pepsi [2]

Answer:

Aquatic plants have aur filled tissues to make them easy to float.....

Explanation:

It provides buoyancy

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2 years ago

The quantity, q grams, of the radioactive isotope strontium-90 present in a sample decreases by half over a period of about t =

velikii [3]

Notice q=3/2, is half of the original q = 3(1/2)t/28.8
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2 years ago

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