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2 years ago

Pls help

Chemistry

1 answer:

Dmitry_Shevchenko [17]2 years ago

4 0

Answer:

The answer would be beryllium

You were probably confused but the correct answer would actually be a beryllium ion.

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Thermochromic ink, for which new uses are appearing in the fashion industry, is able to do what?

neonofarm [45]

Thermochromic ink is a kind of material that takes advantage of thermochromism. In chemistry, this is where a substance changes hues when exposed varying kinds of temperature. In the fashion industry, these inks are used for creating different kinds of accessories, clothing and bag designs.

6 0

2 years ago

12.

Veronika [31]

Answer:

Nonbonding pairs of electrons.

Explanation:

Both oxygen atoms in the diatomic molecule have two nonbonding pairs. This results in the oxygen molecule having a planar geometric shape. This is because nonbonding pairs repel each other are significant in determining the shape of a molecule.

3 0

2 years ago

Read 2 more answers

Two protons and two neutrons are released as a result of this reaction.

Murljashka [212]

Answer: The particle released in the given reaction is one alpha particle

Explanation:

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

$^{222}_{86}\textrm{Rn}\rightarrow ^A_Z\textrm{X}+^{218}_{84}\textrm{Po}$

To calculate A:

Total mass on reactant side = total mass on product side

222 = A + 218

A = 4

To calculate Z:

Total atomic number on reactant side = total atomic number on product side

86 = Z + 84

Z = 2

The isotopic symbol of unknown element is $_{2}^{4}\textrm{He}$ . Another name of helium atom is alpha particle.

Hence, the particle released in the given reaction is one alpha particle

3 0

3 years ago

Read 2 more answers

What period and group (number and name) is Selenium in?

Maru [420]

Answer:

Group 16 Melting point 220.8°C, 429.4°F, 494 K

Period 4 Boiling point 685°C, 1265°F, 958 K

Explanation:

8 0

2 years ago

Suppose a gas starts with a volume of 4.52L, temperature of 23 C, and pressure of 102,00 Pa. If the volume changes to 4.83L and

ivanzaharov [21]

Answer:

The answer to your question is P2 = 84.16 kPa

Explanation:

Data

Volume 1 = V1 = 4.52 L Volume 2 = V2 = 4.83 l

Pressure 1 = P1 = 102 kPa Pressure 2 = P2 = ?

Temperature 1 = T1 = 23°C Temperature 2 = T2 = -12°C

Process

1.- Convert the temperature to °K

Temperature 1 = 23 + 273 = 296°K

Temperature 2 = -12 + 273 = 261°K

2.- Use the Combined Gas law to solve this problem

P1V1/T1 = P2V2/T2

-Solve for P2

P2 = P1V1T2 / T1V2

-Substitution

P2 = (102)(4.52)(261) / (296)(4.83)

-Simplification

P2 = 120331.44 / 1429.68

-Result

P2 = 84.16 kPa

8 0

3 years ago