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3 years ago

(multiple choice) What is the SI unit of mass?

Chemistry

1 answer:

SpyIntel [72]3 years ago

5 0

Answer:

Gram

Explanation:

The SI unit of mass is grams.

Mass is the measure of matter contained in a substance. It is usually determined by weighing an amount of substance on a balance or scale.

Mass is a fundamental quantity
So, the unit of mass is grams.
Ounce and pounds are other units but not the standard one.
Newton is the unit of force and weight.

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Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solutio

agasfer [191]

Answer:

Twice as much.

Explanation:

That's because the freezing point depression depends on the total number of solute particles.

C₆H₁₂O₆(s) ⟶ C₆H₁₂O₆(aq)

0.01 mol of C₆H₁₂O₆ gives 0.01 mol of solute particles.

NaCl(s) ⟶ Na⁺(aq) + Cl⁻(aq)

1 mol of NaCl gives 0.01 mol of Na⁺(aq) and 0.01 mol of Cl⁻(aq).

That's 0.02 mol of particles, so the freezing point depression of 0.01 mol·L⁻¹ NaCl will be twice that of 0.01 mol·L⁻¹ C₆H₁₂O₆.

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4 years ago

[H+] for a solution is 4.59 x 10-6 M.<br> This solution is<br> A. acidic<br> B. basic<br> C. neutral

DedPeter [7]

Answer:

A. acidic

Explanation:

3 0

3 years ago

Blast furnaces extract pure iron from the iron(III) oxide in iron ore in a two step sequence.In the first step, carbon and oxyge

Alona [7]

Answer:

The net chemical equation for the production of iron from carbon, oxygen and iron(III) oxide:

$2Fe_2O_3 (s) +6C (s) + 3O_2 (g)\rightarrow 4Fe (s) + 6CO_2 (g)$

Explanation:

Step 1: Carbon and oxygen react to form carbon monoxide:

$2C (s) + O_2 (g)\rightarrow 2CO (g)$ ..[1]

Step 2: Iron(III) oxide and carbon monoxide react to form iron and carbon dioxide:

$Fe_2O_3 (s) + 3CO (g)\rightarrow 2Fe (s) + 3CO_2 (g)$ ..[2]

The net chemical equation for the production of iron from carbon, oxygen and iron(III) oxide can be obtained by :

3 × [1] + 2 × [2]

$2Fe_2O_3 (s) + 6CO (g)+6C (s) + 3O_2 (g)\rightarrow 4Fe (s) + 6CO_2 (g)+6CO(g)$

CO gas will gas cancel out form both sides ans we will get the net chemical equation:

$2Fe_2O_3 (s) +6C (s) + 3O_2 (g)\rightarrow 4Fe (s) + 6CO_2 (g)$

According to reaction, 2 moles of ferric oxide reacts with 6 moles of carbon and 3 moles of oxygen gas to give 4 moles of iron and 6 moles pf carbon dioxide gas.

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