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dolphi86 [110]
3 years ago
8

Rakesh and his science teacher heated water inside a closed container. The volume of the container was 300 milliliters (mL). Rak

esh measured the properties of the water four different times.
At which time was the material most likely to be a gas?
(heating time min.). (temperature. C*). (mass g.) (Volume ML)
5 30 60 50
10 60 60 80
15 90 60 200
20 100 60 300
a) 5 minutes
b)10 minutes
c)5 minutes
d)20 minutes
Chemistry
1 answer:
blsea [12.9K]3 years ago
6 0
It is B. 10 minutes
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Expressed to the correct number of significant figures, what is the correct sum of (3.04g + 4.134g + 6.1g)?
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Answer:

13.3g

Explanation:

3.04g + 4.134g + 6.1g = 13.274g

=13.3g

When expressing the correct number of significant figures in addition, you go to the last common decimal place. In this case that is 0.1 because all the numbers have this decimal place.

This is because your measurement can only be as precise as the least precise measurement. The more decimal places in the measurement, the more precise the measurement.

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the ph of a naoh solution is 12.05. what is the concentration of [oh-] of the naoh solution? express your answer in standard not
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Answer:

0.01 M

Explanation:

NaOH (sodium hydroxide) is a strong base, so it is completely dissociated into ions in aqueous solution:

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So, we have OH⁻ ions in solution.

From the problem, we have the pH value. The pH is calculated as:

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As NaOH is a base, we can also calculate the pOH:

pOH = -log [OH⁻]

Thus. we can use the relation between pH and pOH to calculate the pOH and then use it to calculate [OH⁻]:

pH + pOH = 14 ⇒ pOH = 14 - pH = 14 - 12.05 = 1.95

pOH = -log [OH⁻] ⇒ [OH⁻] = 10^{-pOH}= 10^{1.95}= 0.0112 M ≅ 0.01 M

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Hope i am right

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