3 years ago

Why did mendeleyev leave spaces in the periodic table

2 answers:

8 0

Answer:

Mendeleev left spaces in his periodic table because he predicted there were elements that weren't discovered yet that would fit in these spaces.

Explanation:

Kisachek [45]3 years ago

4 0

Answer:

He left gaps in his periodic table to place elements not known at the time.

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Is this how you would draw Lewis structure for NO2?

spin [16.1K]

Answer:

No. There would be an extra dot on N

Explanation:

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3 years ago

What is the pH of a 75.0 mL solution that is 0.045 M in weak base and 0.053 M in the conjugate weak acid

noname [10]

Answer:

7.07

Explanation:

HA = weak acid = 0.053

A+ = conjugate base = 0.045

Ka = 7.2x10^-8

Ka = [H+][A-]/HA

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[H+] = 7.2x10^-8 x 0.053/0.045

= 8.48x10^-8

PH = -log[H+]

= -log[8.48x10^-8]

PH = -[login.48 + log10^-8]

PH = -0.928 - (-8)log10

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3 years ago

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Virty [35]

When I answered i got D

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If we wish to prepare 250. mL of 0.200 M BaCl2 solution, how much solid BaCl2 is needed?

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