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3 years ago

Difference between modern and mendeleev's periodic table

Chemistry

2 answers:

iren [92.7K]3 years ago

7 0

Mendeleev’s was organized in atomic mass whereas the modern periodic table is organized by atomic number

xxMikexx [17]3 years ago

3 0

mendeleev's periodic table is based on atomic mass modern periodic table is based on atomic number mendeleev's periodic table contains about 66 elements modern periodic table contains about 112 elements mendeleev's periodic table has gaps and under scope elements modern periodic table maintains uniformity in Mendeleev periodic table noble gases were not placed in modern periodic table gases in a separate group named as group 18 in mendeleev's periodic table transition elements included with other elements in modern periodic table transition elements placed in separate block

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Which of the following acids has the weakest conjugate base?

Marina86 [1]

Answer:

Conjugate base of chloroacetic acid will be weakest.

Explanation:

$K_{a}$ of an acid is a parameter to predict it's acidic strength.

Higher the $K_{a}$ , higher will be acid dissociation . Hence acidity will be higher.

We know that the stronger an acid, the weaker it's conjugate base. So higher the $K_{a}$ value of an acid, weaker will be it's conjugate base.

The order of $K_{a}$ value: $(d)(1.26\times 10^{-3})> (e)(10^{-3})> (c)(10^{-3.8})> (b)(10^{-4.1})> (a)(6.31\times 10^{-5})$

So, conjugate base of chloroacetic acid will be weakest.

5 0

3 years ago

Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 500 mL of solution. A 15.00-mL aliquot w

Karo-lina-s [1.5K]

Answer:

533.33 mg quinine

Explanation:

First we calculate the concentration of the diluted sample, using the values obtained by the standard:

288 * 100 ppm / 180 = 160 ppm

Now we use the dilution factors to calculate the concentration of quinine in the original sample:

160 ppm * 100mL/15mL = 1066.67 ppm

ppm can be defined as mg of quinine/L solvent:

500 mL solution ⇒ 500/1000 = 0.5 L

1066.67 ppm * 0.5L = 533.33 mg quinine

4 0

3 years ago

Which cells contain this organelle: plant cells, animal cells, or both? blank

ser-zykov [4K]

Answer:

Eukaryotic

Explanation:

eukaryotic contain both cells

3 0

2 years ago

How to find the mass of 12dm³ of hydrogen, H2

Soloha48 [4]

you can use the formula F=MA to find any mass of almost anything .

5 0

3 years ago

Identify any three acids. Identify any three bases.

s2008m [1.1K]

Acids:
Sulfuric acid, hydrochloric acid, nitric acid,

Bases:
Potassium hydroxide (KOH)
Sodium hydroxide (NaOH)
Barium hydroxide (Ba(OH)2)

3 0

3 years ago

Difference between modern and mendeleev's periodic table​

Difference between modern and mendeleev's periodic table