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marissa [1.9K]
4 years ago
11

What can be used to identify an unknown substance? Density, Mass, volume?

Chemistry
1 answer:
Mars2501 [29]4 years ago
6 0

You can Multiply

Explanation:

If you have a number of mass then you can divide density and volume or if you have all them I am pretty sure you can multiply

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The equation Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) is an example of which type of reaction?
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Single-replacement reaction. hope it helped <3
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3 years ago
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C(S)+O2(g)--&gt;CO2(g)
soldi70 [24.7K]

<u>Answer:</u> The correct answer is 1.18 g.

<u>Explanation:</u>

We are given a chemical equation:

C(S)+O2(g)\rightarrow CO_2(g)

We know that at STP conditions:

22.4L of volume is occupied by 1 mole of a gas.

So, 2.21L of carbon dioxide is occupied by = \frac{1}{22.4L}\times 2.21L=0.0986mol of carbon dioxide gas.

By Stoichiometry of the above reaction:

1 mole of carbon dioxide gas is produced by 1 mole of carbon

So, 0.0986 moles of carbon dioxide is produced by = \frac{1}{1}\times 0.0986=0.0986mol of carbon.

Now, to calculate the mass of carbon, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of carbon = 0.0986 mol

Molar mass of carbon = 12 g/mol

Putting values in above equation, we get:

0.0986mol=\frac{\text{Mass of carbon}}{12g/mol}\\\\\text{Mass of carbon}=1.18g

Hence, the correct answer is 1.18 g.

3 0
3 years ago
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Is a new can of paint open or closed system
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Answer:

I think it might be a closed system

8 0
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How many electrons will calcium gain or lose when it forms an ion?
Alexeev081 [22]
Calcium will lose 2 electrons to gain a full outer shell.
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3 years ago
Fill in the blanks with its definition or description.
amm1812

Answer:

a) equivalence point

b) direct titration

c) primary standard

d) titrand

e) Back titration

f) back titration

g) standard solution

h) standard solution

I) indirect titration

j) end point

Explanation:

A volumetric analysis is one in which a solution of unknown concentration is determined from its volume. This is commonly referred to as titration.

In titration, a standard solution is reacted with another solution of unknown concentration. The point at which the concentration of the standard solution is equal to that of the analyte is known as the equivalence point (usually indicated by a colour change). An indicator may be added to the analyte solution to help identify when the reaction is complete.

8 0
3 years ago
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