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3 years ago

Which group of elements are the most important for living organisms?\

2 answers:

6 0

B- Carbon nitrogen and oxygen. All organisms are made up of carbon, oxygen is essential to breath, and nitrogen makes up most of earth's atmosphere.

Serhud [2]3 years ago

4 0

The answer is b carbon nitrogen and oxygen

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Thus, it was found that the intestinal microbiota has approximately 100 trillion bacterial cells - about ten times more than the total number of cells in the human body.

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In what way does a temporary magnet provide an advantage over a permanent magnet?

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A temporary magnet allows the user to determine when it is magnetic.

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Question 10 of 25

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Answer:

Correct option would be A. Mg(s) → Mg2+ + 2e-

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Marked as correct answer on Quiz ;) (A P E X)

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Choose the aqueous solution that has the highest boiling point. These are all solutions of nonvolatile solutes and you should as

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Answer: 0.100 m $K_2SO_4$

Explanation:

Elevation in boiling point is given by:

$\Delta T_b=i\times K_b\times m$

$\Delta T_b=T_b-T_b^0$ = Elevation in boiling point

i= vant hoff factor

$K_b$ = boiling point constant

m= molality

1. For 0.100 m $K_2SO_{4}$

$K_2SO_4\rightarrow 2K^{+}+SO_4^{2-}$

, i= 3 as it is a electrolyte and dissociate to give 3 ions. and concentration of ions will be $3\times 0.100=0.300$

2. For 0.100 m $LiNO_3$

$LiNO_3\rightarrow Li^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be $2\times 0.100=0.200$

3. For 0.200 m $C_2H_8O_3$

, i= 1 as it is a non electrolyte and does not dissociate, concentration of ions will be $1\times 0.200=0.200$

4. For 0.060 m $Na_3PO_4$

$Na_3PO_4\rightarrow 3Na^{+}+PO_4^{3-}$

, i= 4 as it is a electrolyte and dissociate to give 4 ions. and concentration of ions will be $4\times 0.060=0.24m$

Thus as concentration of solute is highest for $K_2SO_4$ , the elevation in boiling point is highest and thus has the highest boiling point.

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3 years ago

How many liters are in a cubic meter? 10 100 1,000 10,000 100,000

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1000 is the answer to the queshtion

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