CHEMISTRY HIGH SCHOOL

What is the symbol for an atom containing 20 protons and 22 neutrons?

Answers

Answer 1

Answer: it is an isotope of Calcium, which has the symbol Ca

Answer 2

Answer:

Answer:

calcium

Explanation:

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What unit is used to express the pressure of a gas?(1) mole (2) joule (3) kelvin (4) pascal

Answers

The answer is a PASCAL!

What is scientific consensus?O a new scientific idea that was confirmed by the original researcher
an idea that has been changed due to new information
O a general agreement among scientists about a scientific idea
the understanding that knowledge in a particular area can be uncertain

Answers

The scientific consensus is a general agreement among scientists about a scientific idea. The correct option is C.

What is a scientific idea?

A scientific idea is the explanation or facts of science. It reveals the truth about the world. How the world works and the secrets of nature. It tells and gathers true information about the world.

The different aspects of life and the world are understood and studied by scientists. Different scientists work for different forms of life. The scientist's ideas change over the different evidence.

The generalized ideas of various scientists give and agree upon the different theories of the levels of science. The publication process and specialized field.

Thus, the correct option is C. a general agreement among scientists about a scientific idea.

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Answer:

it's C

Explanation:

got it right on EDG 2021

When a neutral atom undergoes oxidation, the atom’s oxidation state(1) decreases as it gains electrons(2) decreases as it loses electrons(3) increases as it gains electrons(4) increases as it loses electrons

Answers

When a neutral atom undergoes oxidation, the atom's oxidation state increases at it lose electrons.

The acronym "OILRIG" can be used to remember this: Oxidation is Losing electrons, Reduction is Gaining electrons. Therefore, when an atom undergoes oxidation, it loses electrons. This makes its net charge more positive, so its oxidation state increases.
This best fits choice (4).

Before arc welding was developed, a displacement reaction involving aluminum and iron(III) oxide was commonly used to produce molten iron (the thermite process). This reaction was used, for example, to connect sections of iron railroad track. Calculate the mass of molten iron produced when 2.28 kg of aluminum reacts with 17.2 mol of iron(III) oxide.

Answers

Answer: The mass of molten iron formed will be 1.92 kg

Explanation:

We are given:

Moles of iron (III) oxide = 17.2 moles

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Given mass of aluminium = 2.28 kg = 2280 g (Conversion factor: 1 kg = 1000 g)

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium}=(2280g)/(27g/mol)=84.44mol$

The chemical equation for the reaction of aluminium and iron (III) oxide follows:

$2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe$

By Stoichiometry of the reaction:

1 mole of iron (III) oxide reacts with 2 moles of aluminium

So, 17.2 moles of iron (III) oxide will react with = $(2)/(1)* 17.2=34.4mol$ of aluminium

As, given amount of aluminium is more than the required amount. So, it is considered as an excess reagent.

Thus, iron (III) oxide is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of iron (III) oxide produces 2 moles of iron

So, 17.2 moles of iron (III) oxide will produce = $(2)/(1)* 17.2=34.4mol$ of iron

Now, calculating the mass of iron by using equation 1, we get:

Molar mass of iron = 55.8 g/mol

Moles of iron = 34.4 moles

Putting values in equation 1, we get:

$34.4mol=\frac{\text{Mass of iron}}{55.8g/mol}\n\n\text{Mass of iron}=(34.4mol* 55.8g/mol)=1919.5g=1.92kg$

Hence, the mass of molten iron formed will be 1.92 kg

Which nuclear emission has no charge and no mass?(1) alpha particle (3) gamma ray
(2) beta particle (4) positron

Answers

Answer: Gamma ray

Explanation: Nuclear Emission explains the release of energy stored in the nucleus of an atom in the form of particles like alpha particles, beta particles, gamma ray etc.

Alpha particles are the helium atom having +2 charge.

Beta particles have -1 charge thus beta particle and the electron are same.

Positron has a charge of +1 electron having 1/2 spin.

Gamma rays are the rays which are neutral and have no mass.

Final answer:

A gamma ray is a nuclear emission that has no charge and no mass.

Explanation:

Nuclear radiation refers to the emission of particles or electromagnetic waves from atomic nuclei undergoing decay. Types include alpha, beta, and gamma radiation, each with varying properties and effects. It is a fundamental concept in nuclear physics and has applications in medicine, energy production, and weaponry.

The nuclear emission that has no charge and no mass is the gamma ray. Unlike the other options listed, which are particles, gamma rays are electromagnetic radiation and do not have mass or charge. They are highly penetrating and can pass through many materials without being deflected.

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The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen?

Answers

The hydrogen atom has only one electron which is present in the first shell.

We know that first shell can hold a maximum of two electrons so due to incomplete valance shell hydrogen atom is reactive and make covalent bond with other reactive atoms. This bonding will complete its valance shell and finish its reactive nature. In the second shell and other shells can hold 8 electrons so we can conclude that hydrogen has one valance electron.

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