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2 years ago

The main function of the respiratory system is to –

Chemistry

2 answers:

inn [45]2 years ago

6 0

The answer is D. Exchange gases, mostly carbon dioxide and oxygen, between the body and atmosphere!

34kurt2 years ago

3 0

The answer is d I believe

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Which is most likely true about electronegativity?

VikaD [51]

Electronegativity is the tendency of an element to attract the bonded electrons towards itself. In a group, as the atomic radius increases electronegativity decreases as the outermost electron is far away from the nuclear attraction. In a period, the atomic size decreases. So, the effective nuclear charge experienced by the outermost shell increases. Therefore, across a period the electronegativity increases as the increased effective nuclear charge leads to the attraction of bonded electrons with greater ease.

Therefore the correct answer is c, electronegativity tends to increases across a period.

8 0

3 years ago

One cup of fresh orange juice contains 115 mg of ascorbic acid (vitamin c, c6h8o6). given that one cup

kodGreya [7K]

The question is incomplete. Complete question is read as:
'One cup of fresh orange juice contains 115 mg of ascorbic acid (vitamin C, C6H8O6). Given that one cup = 218.0 mL calculate the molarity of vitamin C in organic juice.'
..........................................................................................................................
Answer:
Given: weight of solute (ascorbic acid) = 115 mg = 0.115 g
Volume of solution = 218.0 mL = 0.218 L
Molecular weight of ascorbic acid = 176.12 g/mol.

Now, Molarity = $\frac{\text{weight of solute(g)}}{\text{Molecular weight X Vol. of solution(l)}}$
= $\frac{\text{0.115}}{\text{176.12 X 0.218}}$
 = 0.002995 mol/dm3

Answer: Molarity of solution = 0.002995 mol/dm3

4 0

3 years ago

What does the empirical formula of a compound describe?

lana66690 [7]

It is what form where all coeficients are made into the smallest whole numbers

example

2C+4HC=8HC could be simplified to
C+2HC=4HC (note: formula is not a liegit one, only for example)

8 0

3 years ago

What is the concentration of a solution of (a) KOH for which the pH is 11.89

sashaice [31]

Answer:

[KOH] = 7.76×10⁻³ M

[Ca(OH)₂] = 2.39×10⁻³ M

Explanation:

KOH → K⁺ + OH⁻

pH = - log [H⁺]

14 = pH + pOH

pOH = - log [OH⁻]

10^-pOH = [OH⁻]

14 - 11.89 = 2.11 → pOH

2.11 = - log [OH⁻]

10⁻²°¹¹ = [OH⁻] → 7.76×10⁻³ M

As ratio is 1:1, [KOH] = 7.76×10⁻³ M

14 - 11.68 = 2.32 → pOH

10⁻²°³² = [OH⁻] → 4.78×10⁻³ M

Ca(OH)₂ → Ca²⁺ + 2OH⁻

Ratio is 2:1, so I will have the half of base.

4.78×10⁻³ /2 = 2.39×10⁻³ M

4 0

3 years ago

12.03 Plants and Animals answer key science

forsale [732]

https://dcps.du valschools. org/site/handlers/filedownload.ashx?moduleinstanceid=52947&dataid=63769&FileName=5th%20Grade%20Scienc%20Packet%20ANswer%20Key%20Pt.5.pdf

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3 years ago

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