300 Best Chemistry Questions and Answers (Q&A) - ProProfs Discuss

What is the oxidation number on N in Li3N?

Kkujat
Answered: Apr 19, 2024

-3
3-

Rule 2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3. Li is in group 1, N needs to be -3 to balance.

1 Answer

1299 views

What will happen to a non-metal atom if it combines with a metal atom?

C.Dorothy
Answered: Dec 08, 2017

A nonmetal atom or element does not have much or any metal in it. These types of elements have certain characteristics about them compared to the metals that are on the periodic chart. Nonmetals...Read More

3 Answers

1285 views

What is the following type of reaction: 2AgCl + BaBr2 ----> 2AgBr + BaCl2?

W. Kaye, Ex-Marine
Answered: Apr 10, 2019

The reaction 2AgCI + BaBr2 -----à 2AgBr + BaCI2 is an example of double replacement reaction, which is also identified as metathesis. In this kind of response, the positively charged...Read More

3 Answers

1186 views

What is Fe2S3?

V. Barnes
Answered: May 10, 2018

Fe2S3 is also known as ferric sulfide or sesquisulfide. It is the third iron sulfides besides FeS and FeS2. It is a solid black fine powder but decays into yellow-green powder at ambient...Read More

5 Answers

1184 views

What is the pH of a 0.4 M NaOH solution?

Schouweilerd
Answered: Apr 19, 2024

13.6

According to the Arrhenius definition of acids and bases, NaOH is a base because it increases the concentration of hydroxide in solution. We cannot directly calculate the pH of a...Read More

1 Answer

1142 views

What is the percent by mass of oxygen in magnesium oxide, MgO?

Barry Mclean, Sales Manager
Answered: Feb 28, 2019

40% is the answer to this question. In order to solve this, you need to do some computations. You need to find the ratio of the mass of oxygen and the mass of the compound. You need to multiply...Read More

2 Answers

1139 views

What changes would increase the pressure of a gas in a closed container?

John Adney
Answered: Mar 13, 2017

Increased number of particles in the container.

2 Answers

1121 views

What is the name of the compound with the chemical formula CrCl3?

H. Martin, Content Writer
Answered: Sep 25, 2018

The periodic table is made of different elements. They are all arranged in order of increasing proton number such that there properties repeat after every 8 numbers. All of these elements have...Read More

3 Answers

1077 views

What charge does an electron have compared to a proton?

Barry Mclean, Sales Manager
Answered: Aug 27, 2019

Electrons, protons, and neutrons are the three fundamental particles in an atom. Electron is a negatively charged particle, and according to Dalton's Atomic Theory, electrons are found outside...Read More

3 Answers

1038 views

What is a solution and its types?

K. Myers, Blogger
Answered: Jan 09, 2019

At constant temperature, particles of solute settle down. True solutions are homogeneous solutions containing a mixture of two or more substances dissolved in a solvent. The particle size of the...Read More

2 Answers

1030 views

Which electron transition in a hydrogen atom is associated with the largest emission of energy?

Marshall_Bailey
Answered: Apr 19, 2024

N=2 to n=1

1 Answer

986 views

What is the initial concentration of A if the concentration of A is 0.023 M after 48.0 hours?

John Smith
Answered: Apr 19, 2024

1. 0.11 M

Solving: t1/2 = 21.7 hr = 0.693/ k k = 0.693/21.7hr ln[A]0/[A] = kt ln[A]0/0.023M = 0.693/21.7hr 48.0hr = 1.533 ln[A]0/0.023M =1.533 [A]0/0.023M=4.63 [A]0 = 4.63 0.023M =...Read More

1 Answer

983 views

How many hydrogen atoms are on the product side in the following equation: N2 + 3H2 ----> 2NH3?

John Smith
Answered: Apr 19, 2024

Six

1 Answer

950 views

What is the oxidation number of Hydrogen in KH?

L. Brett, Sales Manager
Answered: Mar 28, 2019

The correct answer to this question is the oxidation number of Hydrogen in KH is -1. A few general rules apply when assigning oxidation numbers: a few of these include the oxidation number of an...Read More

2 Answers

941 views

What is the correct formula for calcium chloride?

John Smith
Answered: Apr 19, 2024

Cacl₂-calciums symbol is ca, and chlorines symbol is cl. calcium is an alkaline earth metal (2, 2a, or iia), which means it forms a +2 ion. chlorine is a halogen (17, 7b, or viia) and forms a -1...Read More

2 Answers

934 views

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