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3 years ago

How does the periodic table used today classify elements?

Chemistry

2 answers:

Svetlanka [38]3 years ago

7 0

The periodic table of today organizes the elements as per their atomic numbers..and not atomic masses.

S_A_V [24]3 years ago

3 0

Answer:

The Periodic Table organizes chemical elements according to the number of protons that each has in its atomic nucleus

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Fluorine and chlorine

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2 years ago

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HELP. I DONT KNOW WHAT TO DO. Barium sulfate, BaSO4, is made by the following reaction.

Ghella [55]

Answer:

$\boxed{\text{66.95 g BaSO$_{4}$}}$

Explanation:

We know we will need an equation with masses and molar masses, so let’s gather all the information in one place.

M_r: 261.34 233.39

Ba(NO₃)₂ + Na₂SO₄ ⟶ BaSO₄ + 2NaNO₃

m/g: 75.00

1. Moles of Ba(NO₃)₂

$\text{Moles of Ba(NO$_{3})_{2}$} = \text{75.00 g} \times \dfrac{\text{1 mol}}{\text{261.34 g}} = \text{0.286 98 mol}$

2. Moles of BaSO₄

The molar ratio is (1 mol BaSO₄/1 mol Ba(NO₃)₂

$\text{Moles of BaSO$_{4}$}= \text{0.286 98 mol Ba(NO$_{3})_{2}$ } \times \dfrac{\text{1 mol BaSO$_{4}$}}{\text{1 mol Ba(NO$_{3})_{2}$}} = \text{0.286 98 mol BaSO$_{4}$}$

3. Mass of BaSO₄

$\text{Mass of BaSO$_{4}$} = \text{0.286 98 mol BaSO$_{4}$} \times \dfrac{\text{233.39 g BaSO$_{4}$}}{\text{1 mol BaSO$_{4}$}} = \textbf{66.98 g BaSO$_{4}$}\\\\\text{The theoretical yield of barium sulfate is } \boxed{\textbf{66.98 g BaSO$_{4}$}}$

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2 years ago

Which particle has two neutrons?<br> o 1 0 n<br> O 2 1 H<br> o 4 2 He<br> O 1 1 H

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4/2 He has two nuetrons

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2 years ago

Pls help !

kirza4 [7]

Answer: It decreases.

Explanation:

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1 year ago

What is a major disadvantage of crude oil as an energy resource ?

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Answer:

Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.

Explanation:

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2 years ago