CHEMISTRY HIGH SCHOOL

Which of the following represents an ion?

a 4he
b Na 2+
c Ca
d Mg

Answers

Answer 1
Answer:

Na2+(answer  B)  represent ions.


Explanation

This is because it has a charge of 2+. ion is formed when an  atom gain or lose  electrons.  when an atom lose electrons it form ion which is positively  charged . On the other hand when atom gain electrons it forms ion of negatively charged. Na2+  has a charge of 2+ since it loses two electrons.

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Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1."Al + HCl → AlCl3 + H2

Answers

The balanced equation is:

2Al + 6HCl -> 2AlCl3 + 3H2

There are 2 Al, 6H, and 6 Cl making the equation balanced and if you need the coefficients in order it is: 2,6,2,3

Answer:

2Al + 6HCl -> 2AlCl3 + 3H2

Explanation:

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NOÀ)

Answers

The answer is 28.02.

The chemical formula for cadmium nitrate is Cd(NO₃)₂.

There are in total 2 nitrogen atoms in Cd(NO₃)₂. If the atomic weight of nitrogen is 14.01, the mass of two nitrogen atoms in one mole of cadmium nitrate is 28.02:
2 · 14.01 = 28.02

How does the number of atoms in one mole of argon compare with the number of molecules in one mole of ammonia

Answers

The number of atoms in one molecule of argon is the same as the number of molecules in onemole of Ammonia which is equal to 6.02 × 10²³units.

The Avogadro's number, postulated by italiàn scientist Amedeo Avogadro, is simply defined as the number of units in one mole of any substance (which is defined as the molecular weight in grams), equal to 6.02 × 10²³.

  • The units may however be electrons, atoms, ions, or molecules, depending on the nature of the substance in discuss.

In this scenario, the number of atoms in onemole of argon is therefore the same as the number of molecules in one mole of Ammonia.

Read more:

brainly.com/question/23845309
They are the same because the definition of a mole is 6.022 x 10^23 molecules or atoms based on whether it is a molecule or element. so there are 6.022 x 10^23 atoms of argon in one mole of argon and 6.022 x 10^23 molecules of ammonia in one mole of ammonia

Which set of conditions is most likely to allow a gas to be considered as an “ideal” gas?(A) low P, low T
(B) low P, high T
(C) high P, low T
(D) high P, high T
(E) all of these
The answer is B because low pressure means less gas interaction and high temperature means the same?

Answers

Yes, the answer is B because at low P and high T the molecules will be more appart one from each other with the consequent lower interaction between them. The model of ideal gas assumes non interaction between the molecules..

An inherited behavior that helps an animal meet its needs

Answers

Answer:

the answer is adaptations

Explanation:

A body part or behavior that helps an animal meet its need in its environment is called an adaptation. All adaptions are inherited traits. Camouflage is an animal's color or pattern that help it blend in with its surroundings.

A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of(1) 1.0 (3) 3.0
(2) 0.20 (4) 20.

Answers

Answer:The correct answer is (3).

Explanation:

The pH of the solution is defined as negative logarithm of H^+ or hydronium ions ions in the solution.

pH=-\log[H^+]

2=-\log[H^+]

[H^+]=0.01 M

The pH with 10 times the concentration H^+ ions.

[H^+]=10* [H^+]'

pH=-\log[H^+]'=-\log[(0.01)/(10)]=3

Hence, the correct answer is (3).
The answer is (3) 3.0. The solution with a pH of 2.0 has greater concentration means the other solution has greater pH. pH=-lg[H+]. So we can get the pH of other solution is 3.
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