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3 years ago

What does the root word “atom” mean and why is that not an accurate name

Chemistry

2 answers:

eimsori [14]3 years ago

7 0

And its not accurate because, we in fact, have split an atom.

Maksim231197 [3]3 years ago

4 0

Answer:

Explanation:

The concept of the atom originated round 440 BC. Leucippus of Miletus came up with the idea. ... Atoms were impenetrably hard, meaning they could not be divided. In Greek, the prefix "a" means "not" and the word "tomos" means cut. Our word atom therefore comes from atomos, a Greek word meaning uncuttable.

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Binary compounds of alkali metals and hydrogen react with water to liberate hydrogen gas. The hydrogen gas from the reaction of

DanielleElmas [232]

Answer: The mass of $H_{2}$ liberated is 0.0383 g and the mass of NaH that reacted 0.455 g.

Explanation:

The given data is as follows.

Volume = 0.501 L,

Temperature of gas = $35^{o}C$ = (35 + 273) K = 308 K,

Total pressure = 760 mm Hg

Vapor pressure of water at $35^{o}C$ = 422 mm Hg

Partial pressure of $H_{2}$ = (760 - 422) mm Hg

= 717.8 mm Hg

The chemical equation is as follows.

$NaH + H_{2}O \rightarrow NaOH + H_{2}$

Using ideal gas equation, we will find the moles of hydrogen gas as follows.

PV = nRT

n = $\frac{PV}{RT}$

As we know,

1 atm = 760 mm Hg

717.8 mm Hg = $717.8 \times \frac{1 atm}{760 mm Hg}$

= 0.944 atm

Putting the given values into the above formula we will calculate the number of moles as follows.

n = $\frac{PV}{RT}$

= $\frac{0.944 atm \times 0.510 L}{0.08206 Latm/mol K \times 308 K}$

= 0.0190 moles

Now, we will find the mass of $H_{2}$ as follows.

Mass = Moles × Molar mass

= 0.0190 moles × 2.01588 g/mol

= 0.0383 g

Therefore, mass of hydrogen is 0.0383 g.

As the ratio between $H_{2}$ and NaH is 1:1. So, we will calculate the moles of NaH as follows.

Mass = Moles × Molar mass

= 0.0190 moles × 23.99771 g/mol

= 0.455 g

Therefore, mass of NaH is 0.455 g.

6 0

3 years ago

. Given the reaction 2HgO → 2Hg + O2 , how many moles of elemental mercury will be obtained by the decomposition of 1 mole of Hg

AveGali [126]

Answer:

one mole of HgO will give one mole of Hg.

Explanation:

Given data:

Moles of HgO = 1 mol

Moles of Hg = ?

Solution:

Chemical equation:

2HgO → 2Hg + O₂

Now we will compare the moles of Hg with HgO from balance chemical equation.

HgO : Hg

2 : 2

1 : 2/2×1 = 1 mol

So, one mole of HgO will give one mole of Hg.

6 0

3 years ago

The most common isotopic forms of hydrogen are ordinary hydrogen (1H) and deuterium (2H), which have percent compositions of 99.

Alborosie

Answer:

0. 000115

Explanation:

A percentage is defined as a ratio with a basis of 100 as total substance. Convert a percentage to decimal implies to divide the percentage in 100 because decimal form has as basis 1.

For the isotopic forms:

1H: 99.98% → As percent.

99.98% / 100 = 0.9998 → As decimal form.

2H: 0.0115% → As percent.

0.0115% / 100 = <em>0. 000115</em>→ As decimal form.

5 0

3 years ago

Draw models to represent the formation of the<br> positive calcium ion and the negative bromide ion.

Andrej [43]

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2 years ago

Number of valence electrons for nitrogen

Feliz [49]

Nitrogen has five valence electrons

3 0

3 years ago