CHEMISTRY HIGH SCHOOL

In the electron cloud model of the atom, an orbital is defined as the most probable(1) charge of an electron(2) conductivity of an electron
(3) location of an electron
(4) mass of an electron

Answers

Answer 1
Answer:

In the electron cloud model of the atom, an orbital is defined as the most probable location of an electron. Hence, option 3 is the correct answer.

What is an atomic orbital?

An atomic orbital is a mathematical term in atomic theory and quantummechanics that describes the position and wavelike behaviour of an electron in an atom.

An electron cloud is ​the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.

It is defined mathematically, describing a region with a high probability of containing electrons.

Hence, option 3 is the correct answer.

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Answer 2
Answer:
The correct answer would be 3.) Location of an electron

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Required nutrients in foods that are made by other living organisms are_______
Which of these solutions has the highest freezing point?1.0 M molecular sucrose (C12H22O11) 1.0 M ionic sodium chloride (NaCl) 1.0 M ionic calcium bromide (CaBr2) 1.0 M ionic aluminum bromide (AlBr3) 1.0 M ionic potassium chloride (KCl)
In which state of matter are the particles close together and highly organized? A. Solid. B. Liquid. C. Gas. D. All of the choices are correct.

What is the difference between the orbital periods of Mercury and Earth?Select one:
a. 0.61 years
b. 0.76 years
c. 1.24 years
d. 1.39 years

Answers

The correct answer is B. The difference between the orbital period of planets Mercury and Earth is 0.76 years. The orbit of mercury is the most eccentric among the planets in the Solar system and the smallest planet. It has an orbital period of 88 Earth days.

Answer:

b. 0.76 years

Explanation:

Mercury is the closest planet to the Sun and the Earth is the third planet from the Sun.

The orbital period of the Earth is 1 year.

Orbital period of the Mercury is 88 days = 0.24 years (Earth years)

Thus, the difference between the orbital periods of Mercury and Earth is

1 year - 0.24 years = 0.76 years

Thus, the correct option is b.

Which value is most likely to be the pH of a salt that is formed by the reaction of a strong acid and a weak base?2.0
7.0
8.0
10.0

Answers

Answer:  2.0 (acidic solution)

Explanation:  When a salt is formed by the reaction of strong acid and a weak base , it will be acidic in nature and thereby its pH will be less than 7.

In the process, conjugate acid will be formed which will react with water to give the hydronium ion (H_{_{3}}O ^{+})

Thus as the positive ion species is increasing, it will make the solution acidic in nature.

The pH value of a salt that is formed by the reaction of a strong acid and a weak base is:  2.0 (acidic solution)

Meaning of pH Value

pH value is a value on the pH scale that tells us how acidic or basic a solution can be.

When a salt is formed by the reaction of strong acid and a weak base , it will be acidic in nature and thereby its pH will be less than 7.

In conclusion, The pH value of a salt that is formed by the reaction of a strong acid and a weak base is:  2.0 (acidic solution)

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The metal wire in an incandescent light bulb glows when the light is switched on and stops glowing when it is switched off. This simple process is which kind of a change?

Answers

physical change because the matter in the object is not chemically changing 

Fluorine (F) and bromine (Br) are in the same group on the periodic table. How do atoms of these elements compare when they form bonds?

Answers

Answer:

they both gain one electron

Explanation:

they are both halogens and they each have one unpaired electron so that unpaired electron join together to make them form a bond

Answer:

c

Explanation:

Which of the following can’t be separated into simpler substances or converted into another substance by chemical processes?a. elements
b. compound
c. solution
d. suspension
e. colloid

Answers

The correct answer is A. An element cannot be separated into simpler substances or converted into another substance by chemical processes. Elements are the most simplest form of the chemicals. They are what we see in the periodic table.

The substances that can't be separated into simpler substances or converted into other substances by chemical processes are elements. They are fundamental substances and cannot be changed into other elements through chemical processes. The correct answer to the given question is option a. elements

The answer to your question is a. elements. In chemistry, elements are substances that cannot be separated into simpler substances or converted into another substance by chemical processes.

This is what makes them fundamental substances. Chemical processes can change compounds, solutions, suspensions, and colloids into different substances, but they cannot change an element into a different element. For example, hydrogen is an element that cannot be converted into any other element through chemical processes. It is fundamentally hydrogen.

The correct answer to the given question is option a. elements

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Which of the following chemical reactions is an oxidation-reduction reaction? CuSO4 + BaCl2 yields BaSO4 + CuCl2 Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3 N2 + 3H2 yields 2NH3 K2SO4 + BaCl2 yields BaSO4 + 2KCl

Answers

Answer : The correct option is, N_2+3H_2\rightarrow 2NH_3

Explanation :

(1) CuSO_4+BaCl_2\rightarrow BaSO_4+CuCl_2

(2) Pb(NO_3)_2+2NaCl\rightarrow PbCl_2+2NaNO_3

(3) K_2SO_4+BaCl_2\rightarrow BaSO_4+2KCl

The reactions 1, 2, and 3 are the example of double-displacement reaction in which the cation and anion of the two reactants exchange their places to give two new compounds.

(4)N_2+3H_2\rightarrow 2NH_3

This reaction is an example of oxidation-reduction reaction.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases.

In this reaction the oxidation state of nitrogen and hydrogen is (0) and the oxidation state of nitrogen and hydrogen in NH_3 are, (-3) and (+1). So, from this we conclude that the nitrogen shows reduction reaction and hydrogen shows oxidation reaction.

Hence, the correct option is, N_2+3H_2\rightarrow 2NH_3
The answer is N2 + 3H2 yields 2NH3. The oxidation-reduction reaction means that there is electrons transfer during the reaction which means that the valence changed.
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