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Ilia_Sergeevich [38]
3 years ago
13

What does a low number on the pH scale say about a solution? O A. The solution is changing, OB. The solution is an acid. O C. Th

e solution is neutral. O D. The solution is a base,​
Chemistry
2 answers:
Zepler [3.9K]3 years ago
6 0

Answer:

B

Explanation:

Amanda [17]3 years ago
5 0

Answer: B) The solution is an acid.

Explanation:

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13. A mixture of MgCO3 and MgCO3.3H2O has a mass of 3.883 g. After heating to drive off all the water the mass is 2.927 g. What
rjkz [21]

Answer:

63.05% of MgCO3.3H2O by mass

Explanation:

<em>of MgCO3.3H2O in the mixture?</em>

The difference in masses after heating the mixture = Mass of water. With the mass of water we can find its moles and the moles and mass of MgCO3.3H2O to find the mass percent as follows:

<em>Mass water:</em>

3.883g - 2.927g = 0.956g water

<em>Moles water -18.01g/mol-</em>

0.956g water * (1mol/18.01g) = 0.05308 moles H2O.

<em>Moles MgCO3.3H2O:</em>

0.05308 moles H2O * (1mol MgCO3.3H2O / 3mol H2O) =

0.01769 moles MgCO3.3H2O

<em>Mass MgCO3.3H2O -Molar mass: 138.3597g/mol-</em>

0.01769 moles MgCO3.3H2O * (138.3597g/mol) = 2.448g MgCO3.3H2O

<em>Mass percent:</em>

2.448g MgCO3.3H2O / 3.883g Mixture * 100 =

<h3>63.05% of MgCO3.3H2O by mass</h3>
6 0
3 years ago
Why do substances with weak intermolecular forces form solids at low melting points?
Advocard [28]
To make any substance solid, molecules must come very close to each other. Substances with weak intermolecular forces have weak bonding. Hence to make their molecules come close to each other, we must provide low temperature. 
7 0
3 years ago
How do we get the essential amino acids we need
kherson [118]

Answer: through your diet

3 0
3 years ago
What are two examples of an endothermic reaction and what are two examples of an ectothermic reaction?
natka813 [3]
Exothermic processes: Making ice cubes,formation of snow in clouds


Endothermic processe: Melting ice cubes, evaporation of water
7 0
3 years ago
What is the percent error if the measured value is 30.0 g and<br> the accepted value is 32.0 g?
JulsSmile [24]

Answer:6.25

Explanation:

3 0
3 years ago
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