3 years ago

Mendeleev's proposal of periodic table was based on:

1 answer:

5 0

The proposal of the periodic table was based upon properties that appeared with some regularity by laying out the elements from lightest to heaviest.

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Which of the following statements concerning the sample size of an experiment is not accurate?

Ilya [14]

A I believe. :)))))))))

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3 years ago

Read 2 more answers

What is the price coke difference between a strong and weak acid?

KATRIN_1 [288]

Explanation:

Strong acids are those that are completely ionized in body fluids, and weak acids are those that are incompletely ionized in body fluids. Hydrochloric acid (HCl) is considered a strong acid because it is present only in a completely ionized form in the body, whereas carbonic acid (H2 CO3) is a weak acid because it is ionized incompletely, and, at equilibrium, all three reactants are present in body fluids. See the reactions below.

H2 CO3 (acid)↔H+ + HCO3- (base)

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5 0

3 years ago

Write the nuclear equation to describe the alpha decay of 243 95 Am

motikmotik

Answer:

Here's what I get.

Explanation:

Your unbalanced nuclear equation is:

$_{95}^{243}\text{Am} \longrightarrow \, _{x}^{y}\text{Z} +\, _{2}^{4}\text{He}$

The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.

Then

95 = x + 2, so x = 95 - 2 = 93

243 = y + 4, so y = 243 - 4 = 239

Element 93 is neptunium, so the nuclear equation becomes

$_{95}^{243}\text{Am} \longrightarrow \, _{93}^{239}\text{Np} + \, _{2}^{4}\text{He}$