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Alex17521 [72]
3 years ago
10

Which one of the following is an element? A. Salt water

Chemistry
2 answers:
natali 33 [55]3 years ago
8 0
An element is a single molecule. the answer is C: Oxygen.
svetoff [14.1K]3 years ago
3 0
The answer is C. Oxygen
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How does an atom become a positively charged ion
sladkih [1.3K]
When, it donates electons.

as for example take
NaCl ( sodium chloride)

it's an ionic compund,
that means it is formed by donating or gaining electrons

Na is writen first than, it must be electropositive i.e it has donated electons which made it positive and the clorine gains electron so it's electronegative.

Na is positive because
as we know it's atomic number is 11 that means it has 11 protons and 11 electrons
now, when it donate electon it has, greater number of protons whose change is +ve so the atom becomes overall positively charged ion or cation.

and something same happens in clorine and because it gains one electron and the number of electrons increase in it by 1 whise charge is -ve so, the atom becomes negatively charged ion or anion which has a -1 charge.
3 0
3 years ago
If a person weighs 87lbs and has to be given a drug with a dosage of 50 milligrams per kilogram body weight, how many grams of t
Katarina [22]

Answer:

1 957,5

Explanation:

87libs=39.5kg that equals 50=1.957.5

7 0
3 years ago
What type of wave is a s-wave and how does energy move through the wave
Blizzard [7]
In S or shear waves, rock oscillates perpendicular to the direction of wave propagation.
3 0
3 years ago
Bleach contains the active ingredient NaClO. Analysis of bleach involves two sequential redox reactions: First, bleach is reacte
Alisiya [41]

Answer:

0,31%

Explanation:

For the reaction:

I₂ + 2 S₂O₃²⁻ → 2 I⁻ + S₄O₆²⁻

0,043 L × 0,117 M of sodium tiosulfate = 5,031x10⁻³ moles of S₂O₃²⁻

5,031x10⁻³ moles of S₂O₃²⁻ × \frac{1 I_2 mol}{2 S_{2}O_3 mol^{2-}} = <em>2,5156x10⁻³ moles of I₂</em>

These moles of I₂ were produced from:

ClO⁻⁻ + 2 H⁺ + 2 I⁻ → I₂ + Cl⁻ + H2O

2,5156x10⁻³ moles of I₂ ≡ moles of NaClO

2,5156x10⁻³ moles of NaClO ×\frac{74,44 g}{1mol} =<em> 0,187 g of NaClO</em>

Thus, percentage composition by mass is:

\frac{0,187 g of NaClO}{60 g Of Bleach} x 100 =<em> 0,31%</em>

I hope it helps!

5 0
3 years ago
Below are 5 sets of potential solutes for you to compare. Both members of each pair are very soluble in water. If you had equal
miss Akunina [59]

Answer:

CaCl2, Li2S, AlCl3, AlCl3, K2S

Explanation:

When figuring out which is a better conductor of electricity you want to look at which has the largest yield of dissociated ions.

6 0
3 years ago
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