What combines to form compounds? A. atoms of elements B. molecules C. minerals D. valences

1 answer:

6 0

Arguably A, B and C are all correct. Atoms of elements can form compounds such as NaCl(table salt). Molecules form molecular compounds and minerals are just complex molecule compounds.

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Question 2 (20 points)

lapo4ka [179]

Answer:

1,5,2,6,3,4

Explanation:

8 0

3 years ago

If helium had exactly the same mass as four hydrogen atoms, the luminosity o f the sun would be

Katena32 [7]

Hydrogen has an atomic mass of about 1 and It contains one proton, orbited by a single electron. Helium has an atomic mass of approximately 4 and contains of 2 protons and 2 neutrons, orbited by 4 electrons. But all of this is irrelevant because luminosity is related to gravity, and that mass would identical, luminosity would be near identical. *insert luminosity relation equation here*

7 0

3 years ago

The protein catalase catalyzes the reaction The Malcolm Baldrige National Quality Award aims to:

Marina CMI [18]

The question is missing a part, so the complete question is as follows:

The protein catalase catalyzes the reaction The Malcolm Bladrigde National Quality Awards aims to: 2H2O2 (aq) ⟶ 2H2O (l) + O2 (g) and has a Michaelis-Menten constant of KM = 25mM and a turnover number of 4.0 × 10 7 s -1. The total enzyme concentration is 0.012 μM and the intial substrate concentration is 5.14 μM. Catalase has a single active site. Calculate the value of Rmax (often written as Vmax) for this enzyme. Calculate the initial rate, R (often written as V0), of this reaction.

1) Calculate Rmax

The turnover number (Kcat) is a ratio of how many molecules of substrate can be converted into product per catalytic site of a given concentration of enzyme per unit of time:

Kcat = $\frac{Vmax}{Et}$ ,

where:

Vmax is maximum rate of reaction when all the enzyme sites are saturated with substrate

Et is total enzyme concentration or concentration of total enzyme catalytic sites.

Calculating:

Kcat = $\frac{Vmax}{Et}$

Vmax = Kcat · Et

Vmax = 4× $10^{7}$ · 1.2 × $10^{-8}$

Vmax = 4.8 × $10^{-1}$ M

2) Calculate the initial rate of this reaction (R):

The Michaelis-Menten equation studies the dynamics of an enzymatic reaction. This model can explain how an enzyme enhances the rate of a reaction and how the reaction rate depends on the concentration of the enzyme and its substrate. The equation is:

V0 = $\frac{[S].(Vmax)}{KM + [S]}$ , where: