CHEMISTRY MIDDLE SCHOOL

In liters, occupied by 2.18 miles of N2 gas

Answers

Answer 1

Answer:

Answer:

The volume occupied by 2.18 moles of $N_(2)$ is 48.832L

Explanation:

The volume occupied by 1 mole of $N_(2)$ is 22.4 L

The volume occupied by 1 mole of any gas is 22.4 L

The number of moles of $N_(2)$ = 2.18 moles

The volume occupied by 2.18 moles of $N_(2)$ :

$Volume=2.18*22.4=48.832L$

Hence, the volume occupied by 2.18 moles of $N_(2)$ is 48.832L

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Placing of a material in a new place is called _______.

Answers

it is called deposition

Alpha effect on atomic mass and effect on atomic number

Answers

Question: alpha effect on atomic mass and effect on atomic number

Answer: the atomic mass number decreases by four and the atomic number decreases by two

Explanation: When an alpha particle is emitted from the nucleus, the nucleus loses two protons and two neutrons and creates a new element

question answered by

(jacemorris04)

By usuning usfal numbers

How long would it take for a car to travel 200km if it has an aventage speed of 55 km/ hr

Answers

Answer: 3.64 hours

Explanation:

Formula of Average speed : $\text{Average speed}=\frac{\text{Distance}}{\text{Time}}$

Given : Distance = 200km ; Average speed = 55 km/ hr

To find : Time

Substitute values for distance and average speed in the above formula , we get

$55=\frac{200}{\text{Time}}\n\n\Rightarrow\text{Time}=(200)/(55)=3.63636363636\approx3.64\ hr$

Hence, it would take 3.64 hours for a car to travel 200km .

How many valence electrons does lithium (Li) have available for bonding? 1 2 3 4

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The number of valence electrons that Lithium has for chemical bonding would be 1. According to the electron configuration of lithium, 1s^2 2s^1. This single valence electron is found in the 2s orbital of the 2nd energy level.

Answer:

The answer is A. 1

Explanation:

The elements in Group 2 have similar chemical properties because each atom of these elements has the same(a) atomic number
(b) mass number
(c) number of electron shells
(d) number of valence electrons

Answers

Answer;

- (d) number of valence electrons

The elements in Group 2 have similar chemical properties because each atom of these elements has the same number of valence electrons.

Explanation;

-Group 2 elements are also called alkaline earth metals, such as calcium, magnesium, strontium, barium , etc.

-These metals have a valency of two, which means they have two electrons in the outermost energy shell. Therefore; they react by loosing two electrons to form a stable configuration or an octet configuration. They are highly metallic and are good conductors of electricity.

The elements in Group 2 have similar chemical properties 'cause they have the same no. of electrons.

A compound is 44.7% P and the rest O. Determine its emperical formula.

Answers

Answer:

P₅O₁₂

Explanation:

Assume that you have 100 g of the compound.

Then you have 44.7 g P and 55.3 g O.

1. Calculate the moles of each atom

Moles of P = 44.7 × 1/30.97 = 1.443 mol Al

Moles of O = 55.3 × 1/16.00 = 3.456 mol O

2. Calculate the molar ratios.

P: 1.443/1.443 = 1

O: 3.456/1.443 = 2.395

3. Multiply by a number to make the ratio close to an integer

P: 5 × 1 = 5

O: 5 × 2.395 = 11.97

3. Determine the empirical formula

Round off all numbers to the closest integer.

P: 5

O: 12

The empirical formula is P₅O₁₂.

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