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3 years ago

What is the category name of these each:

Chemistry

1 answer:

Scorpion4ik [409]3 years ago

4 0

Answer:

There are seven main taxonomic ranks: kingdom, phylum or division, class, order, family, genus, species. In addition, domain (proposed by Carl Woese) is now widely used as a fundamental rank, although it is not mentioned in any of the nomenclature codes, and is a synonym for dominion (lat.

Explanation:

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BARSIC [14]

½H2(g) + ½I2(g) → HI(g) ΔH = +6.2 kcal/mol
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½H2(g) + ½I2(g) + 6,2kcal/mole → HI(g)
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21.0 kcal/mole + C(s) + 2S(s) → CS2(l)
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3 years ago

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What is the colour of litmus in a solution of ammonium hydroxide?

sammy [17]

Answer:

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Explanation:

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3 years ago

g If 50.0 mL of a 0.75 M acetic acid solution is titrated with 1.0 M sodium hydroxide, what is the pH after 10.0 mL of NaOH have

V125BC [204]

Answer:

pH = 2.66

Explanation:

Acetic Acid + NaOH → Sodium Acetate + H₂O

First we calculate the number of moles of each reactant, using the given volumes and concentrations:

0.75 M Acetic acid * 50.0 mL = 37.5 mmol acetic acid

1.0 M NaOH * 10.0 mL = 10 mmol NaOH

We calculate how many acetic acid moles remain after the reaction:

37.5 mmol - 10 mmol = 27.5 mmol acetic acid

We now calculate the molar concentration of acetic acid after the reaction:

27.5 mmol / (50.0 mL + 10.0 mL) = 0.458 M

Then we calculate [H⁺], using the following formula for weak acid solutions:

[H⁺] = $\sqrt{C*Ka}=\sqrt{0.458M*1.76x10^{-5}}$

[H⁺] = 0.0028

Finally we calculate the pH:

pH = -log[H⁺]

pH = 2.66

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Z forms chloride compounds with the formulae ZCl2 and ZC13.

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Answer:

(B) II, IV.

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2 years ago

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C. Carbon. H. Hydrogen. N. Nitrogen. O. Oxygen. P. Phosphorus. S. Sulfur.

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3 years ago

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