CHEMISTRY MIDDLE SCHOOL

How does waste filtered by kidneys leave the body? A) It leaves through breath as humans exhale. B) It leaves through the skin as sweat. C) It leaves through the urethra as urine. D) It leaves through the nose and mouth as excess mucus

Answers

Answer 1

Answer:

Answer:

i don't know if this is correct just let me know if it is

Explanation:

i would say C but (for later knowledge) the unfiltered waste would come out as kidney stones

Answer 2

Answer:

C it’s part of the excretory system just like the urethra

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What is the concentration of O2(g), in parts per million, in a solution that contains 0.008 gram of O2(g) dissolved in 1000. grams of H2O(2)?Listen

1

0.8 ppm

8 ppm

80 ppm

800 ppm

Answers

Answer : The concentration of $O_2$ (g) in parts per million is, 8 ppm

Explanation : Given,

Mass of oxygen gas (solute) = 0.008 g

Mass of water (solvent) = 1000 g

First we have to calculate the mass of solution.

Mass of solution = Mass of solute + Mass of solvent = 0.008 + 1000 = 1000.008 g

Now we have to calculate the concentration of $O_2$ (g) in parts per million.

ppm : It is defined as the mass of solute present in one million $(10^6)$ parts by mass of the solution.

$ppm=\frac{\text{Mass of solute}}{\text{Mass of solution}}* 10^6$

Now put all the given values in this expression, we get

$ppm=(0.008g)/(1000.008g)* 10^6=7.99=8ppm$

Therefore, the concentration of $O_2$ (g) in parts per million is, 8 ppm

What determines how many bond an atom will form?

Answers

The electronegativities of the two atoms play a part in determining what kind of bonds are formed. The main two types of chemical bonds are ionic and covalent. Covalent bonds are formed by atoms that share valence electrons and are most commonly formed between nonmetal atoms.

Their valance electrons are redistributed in ways that make the atoms more stable.

Why is a piece of apple rotting a chemical change

Answers

Because the glucose (and other useful substances) are no longer there after the rotting (the substance itself changes, rather than simply changing some state of the same substance)

Because you can't change it back to the way it was before it rotted.

READING CHECK1. What is always true about the
kinetic energy of a single particle
in a gas?

Answers

Gas particles are in constant motion, and any object in motion has kinetic energy (Ek). ... For example, in the collision of two molecules, one molecule may be deflected at a slightly higher speed and the other at a slightly lower speed, but the average kinetic energy does not change.
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What is the formula used to calculate heat of fusion?

Answers

Answer:

The formula used to calculate heat of fusion:

q = m·ΔH f

when an iron nail is placed in an aqueous solution of copper(ii)sulphate,a reaction take place.construct an ionic equation for reaction?

Answers

The net ionic equation for this reaction is $Fe(s) \ + \ Cu^(2+)(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ Cu(s)$ . In ionic equations the soluble compounds are written in their dissociated ion forms. The ionic equation can be determined by knowing the general solubility rules. In this problem there are sulfate compounds involved. It is important to know that sulfates are generally soluble except for sulfates of Ba, Pb, Ag, and Sr. Therefore, the ones dealt with in this problem, CuSO4 and FeSO4, are both soluble in water.

Further Explanation:

The complete equation for this reaction is:

$Fe(s) \ + \ CuSO_(4)(aq) \rightarrow \ FeSO_(4)(aq) \ + \ Cu(s)$

CuSO4 and FeSO4 are soluble in water which will lead to the ionic equation:

$Fe(s) \ + \ Cu^(2+)(aq) \ + \ SO_(4)^ {2-}(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ SO_(4)^(2-)(aq) \ + \ Cu(s)$

Since the sulfate ion appears on both sides, it is a spectator ion. Spectator ions are unchanged in the chemical reaction and are removed from the net ionic equation:

$\boxed {Fe(s) \ + \ Cu^(2+)(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ Cu(s)}$

Based on the net ionic equation it can be seen that this is a reduction-oxidation reaction. Iron was oxidized and copper was reduced.

Learn More

Learn more about solubility rules brainly.com/question/11617954
Learn more about redox reactions brainly.com/question/2388654
Learn more about chemical equations brainly.com/question/6976143

Keywords: ionic equation, solubility

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