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2 years ago

Please help will give 30 points.

Chemistry

1 answer:

vredina [299]2 years ago

3 0

Answer:

Dependent variable: If calcium is given, then bone strength will increase.

Explanation:

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What makes up the human body? (A)many different gases (B)carbon dioxide (D)many cells (C) minerals

never [62]

Answer:

$(B) Carbon Dioxide$

Explanation:

Roughly 96 percent of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen and nitrogen, with a lot of that in the form of water. The remaining 4 percent is a sparse sampling of the periodic table of elements

Hope this helps :)

4 0

3 years ago

Read 2 more answers

How much more powerful is a magnitude 8 earthquake than a magnitude 4 earthquake? A. 4 times B.100 times C.1000 times D.10000 ti

Ede4ka [16]

Answer:

C) 1,000

Explanation:

The answer is 1,000

7 0

2 years ago

Which of the following data does a complete and balanced chemical equation NOT reveal?

Fudgin [204]

Answer:o quarto

Explanation:

3 0

2 years ago

The activation energy for proline isomerization of a peptide depends on the identity of the preceding residue and obeys Arrheniu

MAVERICK [17]

Answer:

Activation energy of phenylalanine-proline peptide is 66 kJ/mol.

Explanation:

According to Arrhenius equation- $k=Ae^{\frac{-E_{a}}{RT}}$ , where k is rate constant, A is pre-exponential factor, $E_{a}$ is activation energy, R is gas constant and T is temperature in kelvin scale.

As A is identical for both peptide therefore-

$\frac{k_{ala-pro}}{k_{phe-pro}}=e^\frac{[E_{a}^{phe-pro}-E_{a}^{ala-pro}]}{RT}$

Here $\frac{k_{ala-pro}}{k_{phe-pro}}=\frac{0.05}{0.005}$ , T = 298 K , R = 8.314 J/(mol.K) and $E_{a}^{ala-pro}=60kJ/mol$

So, $\frac{0.05}{0.005}=e^{\frac{[E_{a}^{phe-pro}-(60000J/mol)]}{8.314J.mol^{-1}.K^{-1}\times 298K}}$

$\Rightarrow$ $E_{a}^{phe-pro}=65705J/mol=66kJ/mol$ (rounded off to two significant digit)

So, activation energy of phenylalanine-proline peptide is 66 kJ/mol

7 0

2 years ago

What occurs when energy is removed from a liquid-vapor system in equilibrium

yulyashka [42]

The answer is that the number of water molecules increases and that of vapor decreases. When energy is removed from the system it would do so mostly as heat. Therefore the energy in the system would decrease and the molecules would vibrate at lower energies. Therefore, several water vapor molecules would turn back to water.

4 0

3 years ago