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2 years ago

14

Which scientist was the first to conclude through experimentation that atoms contain most of their mass in a small, dense nucleu

s?

1 answer:

AURORKA [14]2 years ago

4 0

Answer:

Ernest Rutherford

Explanation:

Ernest Rutherford was the first to conclude experiments

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A topographical map of a section of Charleston, SC is shown. What feature is located at the dot marked with an X? A) the center

Effectus [21]

It seems that you have missed the given image to answer this question. But anyway, I found it and got the answer. Based on the topographical map of a section of Charleston, SC, the feature that is <span>located at the dot marked with an X is the high point of a hill. The answer would be option D.</span>

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2 years ago

The last group on the periodic table is called the noble gases. The elements in this group are

Anni [7]

Answer:

C

Explanation:

They are stabil and full of valence electron.

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2 years ago

Hydrogen peroxide slowly decomposes in light:

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Answer:

Explanation: the answer is A

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2 years ago

How many milliliters of 2.19 M H2SO4 are required to react with 4.75 g of solid containing 21.6 wt% Ba(NO3)2 if the reaction is

Setler [38]

Answer:

1.7927 mL

Explanation:

The mass of solid taken = 4.75 g

This solid contains 21.6 wt% $Ba(NO_3)_2$ , thus,

Mass of $Ba(NO_3)_2$ = $\frac {21.6}{100}\times 4.75\ g$ = 1.026 g

Molar mass of $Ba(NO_3)_2$ = 261.337 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{1.026\ g}{261.337\ g/mol}$

$Moles= 0.003926\ mol$

Considering the reaction as:

$Ba(NO_3)_2+H_2SO_4\rightarrow BaSO_4+2HNO_3$

1 moles of $Ba(NO_3)_2$ react with 1 mole of $H_2SO_4$

Thus,

0.003926 mole of $Ba(NO_3)_2$ react with 0.003926 mole of $H_2SO_4$

Moles of $H_2SO_4$ = 0.003926 mole

Also, considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Molarity = 2.19 M

So,

$2.19=\frac{0.003926}{Volume\ of\ the\ solution(L)}$

Volume = 0.0017927 L

Also, 1 L = 1000 mL

<u>So, volume = 1.7927 mL</u>

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2 years ago

Choose the description that matches the law of included fragments.

GREYUIT [131]

Answer:

The answer is B

Explanation:

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2 years ago