2 years ago

Which of the following is an example of a chemical change?

1 answer:

7 0

A chemical change changes the bonds by forming or breaking them, and cannot be brought back to it's original form.

b. milk souring

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The half-life of radium-226 is 1600 years. How many grams of a 0.25 g sample will remain after 4800 years?

murzikaleks [220]

The half-life of radium-226 is 1600 years. How many grams of a 0.25 g sample will remain after 4800 years?

this would be 0.03125 gram

8 0

2 years ago

If a red blood cell is 100% saturated, how many molecules of O2 are bound to it?1 billion molecules of O24 molecules of O2250 mi

kondor19780726 [428]

Answer:

1 billion molecules O₂

Explanation:

From my research, a human red blood cell contains approximately 270 million hemoglobin molecules.

A hemoglobin molecule contains four heme groups, <em>each of which has an iron ion forming a coordination complex that carries every dioxygen molecule. </em>Therefore for each hemoglobin molecule, we will have 4 dioxygen molecules. The heme groups are responsible for the transport of every dioxygen and other diatomic gases.

Hence, the number of O₂ molecules in a red blood cell saturated with 100% will be:

$\frac{270 \cdot10^{6} hemoglobine molecules}{1 red blood cell} \cdot \frac{4 heme group}{1 hemoglobine molecule} \cdot \frac{1 O_{2} molecules}{1 heme group} = 1 \cdot 10^{9} O_{2} \frac{molecules}{red blood cell}$