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3 years ago

Which is the least reliable method for identifying a mineral

Chemistry

2 answers:

liraira [26]3 years ago

5 0

<h2>Answer:</h2>

Color of mineral is the least reliable method for identifying a mineral.

<h3>Explanation:</h3>

The same mineral can come in a variety of colors and different minerals can be the same color. The color can change over time do to weathering.
Color of a mineral is easily observed as it does not need specific methodology.
Color identification can be done by simple observation.

algol [13]3 years ago

4 0

It's color, my son got this one right.

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I need help on #'s 4 and 5

kompoz [17]

The answer for four is frequency.

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4 years ago

A solid powder is known to be a mixture of NaCl and Na2CO3, but the relative amounts of each compound in the sample are unknown.

AveGali [126]

Answer:

Concentration of sodium carbonate in the solution before the addition of HCl is 0.004881 mol/L.

Explanation:

$Na_2CO_3(aq) +2 HCl(aq)\rightarrow 2NaCl(aq) + H_2O(l)+CO_2(g)$

Molarity of HCl solution = 0.1174 M

Volume of HCl solution = 83.15 mL = 0.08315 L

Moles of HCl = n

$molarity=\frac{moles}{Volume (L)}$

$0.1174 M=\frac{n}{0.08315 L}$

$n=0.1174 M\times 0.08315 L=0.009762 mol$

According to reaction , 2 moles of HCl reacts with 1 mole of sodium carbonate.

Then 0.009762 mol of HCl will recat with:

$\frac{1}{2}\times 0.009762 mol=0.004881 mol$

Moles of Sodium carbonate = 0.004881 mol

Volume of the sodium carbonate containing solution taken = 1L

Concentration of sodium carbonate in the solution before the addition of HCl:

$[Na_2CO_3]=\frac{0.004881 mol}{1 L}=0.004881 mol/L$

4 0

3 years ago

How does a physical change differ from a chemical change

inysia [295]

With a physical change you can actually see it change like ice turning into water, then with a chemical change you can't see it change, although within the molecules themselves they change which makes that possible.

Hope this helps!

6 0

3 years ago

Read 2 more answers

How many moles of carbon dioxide are produced when 5.12 mol of propane gas is burned in excess oxygen? C3H8(g) + 5O2(g) → 3CO2(g

maxonik [38]

Answer:

15.4 mol CO₂

Explanation:

5.12 mol C₃H₈ × (3 mol CO₂ / mol C₃H₈) ≈ 15.4 mol CO₂

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3 years ago