Ionic crystals are typically brittle because distortion of the crystal lattice produces:-

Compare the charge and mass of protons,neutrons and electrons

telo118 [61]

Protons are positively charged, electrons are negatively charged, and Neutrons have no charge or are in fact "neutral". Protons and Neutrons are located in the nucleus of an atom and are most of the atoms mass. Electrons have an extremely minute mass even compared to Protons and Neutrons

8 0

3 years ago

A compound that is composed of only carbon and hydrogen contains 80.0% c and 20.0% h by mass. What is the empirical formula of t

gladu [14]

<u>Solution</u> : Emperical Formula = $CH_{3}$

Emperical Formula - A formula that gives the simplest whole number ratio of atom in a compound.

In the question percentages are given then assume that the total mass is 100grams so that the mass of each element is equal to the percentage given.

Given : 80.0g Carbon

20.0g Hydrogen

First convert the given masses into moles.

$80.0g\text{ C} \times \frac{1 g/mole \text{ C}}{12.0 g/mole \text{ C}}= 6.66\text{mole of C}$

$20.0g\text{ H} \times \frac{1 g/mole \text{ H}}{1 g/mole \text{ H}}= 20.0\text{mole of H}$

Value of each mole divided by the smallest number of moles and then round off.

Moles ratio of the element are

$\frac{6.66}{6.66}\text{mole of C}= 1$

$\frac{20.0}{6.66}\text{mole of C}= 3$

This is the mole ratio of the elements and is repersented by the subscript in the emperical formula.

Emperical Formula = $CH_{3}$

3 0

3 years ago

In supersonic flights, molecules break apart and react chemically. which safety features protect the plane?

harkovskaia [24]

Answer:

Explanation:

The heat Shield are materials (usually made of metals) protect us from heat by absoring lots of heat and gradually releasing heat by surrounding air cirucaltion

4 0

3 years ago

Plutonium-239 undergoes alpha decay and has a half-life of 24, 000 years . After 72, 000 years, how much of an initial 100.0 sam

Rina8888 [55]

Hey there!

A half-life means after a certain amount of time, half of that substance will have decayed after that time.

There are 3 half-lives in 72,000 years because 72,000 ÷ 24,000 = 3.

So, we divide the 100g sample in half 3 times.

100 ÷ 2 = 50

50 ÷ 2 = 25

25 ÷ 2 = 12.5

There will be 12.5g of the radioactive sample remaining after 72,000 years.

Hope this helps!

4 0

3 years ago

I will give Brainlyiest! I just need this ASAP :)

serg [7]

Equation of reaction:

2 Na + Cl₂ → 2 NaCl

Oxidation States:
L.H.S R.H.S
O.N of Na = 0 +1 = O.N of Na in NaCl
O.N of Cl = 0 -1 = O.N of Cl in NaCl

Oxidation Reaction:
In this reaction O.S of Na is changing from 0 to +1 state, means it has oxidized with a loss of 1 electron,

Na → Na⁺ + e⁻

Reduction Reaction:
In this reaction O.S of Cl is changing from 0 to -1 state, means it has reduced with a gain of 1 electron per atom,

Cl₂ + 2e⁻ → 2Cl⁻

Oxidizing Agent:
In this reaction Cl is oxidizing agent as it has gain electron from sodium and has oxidized Na to Na⁺.

Reducing Agent:
In this reaction Na is reducing agent as it has given electron to chlorine and has reduced Cl to Cl⁻.

5 0

3 years ago