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4 years ago

15

A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. Which is the symbol of t

his nuclide?

2 answers:

Alina [70]4 years ago

7 0

The mass number goes on top, and the atomic number goes on bottom.
Therefore, the answer is C:
40
K
19

aleksklad [387]4 years ago

3 0

Answer:

C. 40/19 K

Explanation:

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Write the name and molecular formula of an organic compounds having its name suffixed with -ol and having 2 carbon atoms in the

777dan777 [17]

Ethanol C₂H₆O

Explanation:

When ethanol (CH₃-CH₂-OH) is heated in the presence of the sulphuric acid (H₂SO₄) it will produce ethylene (CH₂=CH₂ ) and water (H₂O).

CH₃-CH₂-OH → CH₂=CH₂ + H₂O

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3 years ago

In a chemical interaction 10 g of hydrogen chloride is added to 20 g of zinc to form 24 g of zinc chloride and a certain amount

marin [14]

The Answer would be...

A. 6g

I hope this is right!

6 0

3 years ago

Read 2 more answers

A solution of acetic acid has a pH of 3.45. What is the concentration of acetic acid in this solution? Ka for CH3COOH is 1.8×10-

Serjik [45]

Answer:

0.007 M

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,

pH = - log [H⁺]

The expression of the pH of the calculation of weak acid is:-

$pH=-log(\sqrt{k_a\times C})$

Where, C is the concentration = ?

Given, pH = 3.45

So, for $CH_3COOH$ , $K_a=1.8\times 10^{-5}$

$3.45=-log(\sqrt{1.8\times 10^{-5}\times C})$

$\log _{10}\left(\sqrt{1.8\cdot \:10^{-5}C}\right)=-3.45$

C = 0.007 M

5 0

3 years ago

(Upvote) Two atoms that are isotopes of one another must have the same number of what? A. Electrons B. All Particles C. Protons

UNO [17]

Protons, the number of protons cannot change or the element will change as well.

4 0

3 years ago

Help me please someone help me I’ve been here for hours

mash [69]

Answer:

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Explanation:

Fugi- Multicellar

Protista- unicellar

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7 0

3 years ago