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Pie
2 years ago
14

Everyone needs a certain number of ____________ to meet their daily energy needs.

Chemistry
1 answer:
Ganezh [65]2 years ago
8 0

Answer:

The answer is calories.

The average human being needs 2000 calories for them to be energized.

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Changing the pressure of a system has the highest effect on a substance in which phase?
katrin2010 [14]
The answer is A- Gas.
7 0
3 years ago
What is the solution to the problem expressed to he correct number of significant figures? 12.0/7.11
Law Incorporation [45]

Answer: The solution to the problem expressed to he correct number of significant figures is 1.69

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule applied for multiplication and division is :

The least precise number determines the number of significant figures in the answer.

As 12.0 has 3 significant digits and 7.11 also has 3 significant digits, the answer would also contain 3 significant digits.

For \frac{12.0}{7.11}=1.69

Thus the solution to the problem expressed to he correct number of significant figures is 1.69

6 0
2 years ago
A chemistry student needs of acetone for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student dis
galben [10]

Answer:

The answer is "7.90 \ g".

Explanation:

Please finds the complete question in the attached file.

Volume = 10.0 \ mL \\\\Density =0.79 g\  cm^3

\text{Density}=\frac{Mass}{Volume}

Mass = Density \times Volume

         =(0.790 g\ cm^3) \times 10.0 \ mL\\\\=7.90 \ g

The mass of acetone to be weighed is 7.90 \ g

8 0
2 years ago
What is the oxidation number of phosphorus (P) in sodium phosphate (Na3PO4)?
joja [24]
Na⁺¹₃P⁺⁵O⁻²₄

+1*3 + (+5) + (-2*4) = 0
8 0
3 years ago
Read 2 more answers
Predict which of the following metals reacts with hydrochloric acid.
VashaNatasha [74]

Answer:

Pb, Cr, Fe

Explanation:

6 0
3 years ago
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