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Chemistry Questions and Answers (Q&A)

H.Jennifer
Answered: Apr 23, 2018
A pure substance is an element or compound that has a constant chemical composition and property. It cannot be separated into components by physical separation, without breaking down chemical...Read More

2 Answers

761 views
CECHS
Answered: Jun 06, 2020
Potassium sulfate

1 Answer

732 views
E. Stanley, Technical writer
Answered: Jun 27, 2018
Phosphorus is one of the elements that you can find in the periodic table of elements. This is also the element that has the ability to expand its valence shell. This means that aside from the...Read More

3 Answers

720 views
Barry Mclean, Sales Manager
Answered: Feb 28, 2019
C 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

716 views
Anika Nicole, Wordsmith
Answered: Jul 04, 2018
The aluminum has the greater buoyant force on it. This is because aluminum has low density than lead. And the density of a substance is defined as mass per unit volume. That means density i...Read More

2 Answers

694 views
K.Paul
Answered: Dec 11, 2017
The answer to the question about “Which three groups of the Periodic Table contain the most elements classified as metalloids (semimetals)?” is letter C of 14, 15, and 16. The list of...Read More

3 Answers

683 views
L. Brett, Sales Manager
Answered: Mar 28, 2019
The correct answer to this question is A; 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...Read More

2 Answers

675 views
T. Moore, Writer
Answered: Nov 27, 2018
The correct answer is option A (- 3).
Elements in the periodic table are arranged according to the number of ions they have, for example, sodium a group 1 element has +1 cation, group 2...Read More

3 Answers

667 views
T. Moore, Writer
Answered: Jan 17, 2019
None of the choices has the correct answer to this item. The correct formula for Lead IV Nitrate is Pb(NO3)4. Pb is the chemical symbol for the element Lead and NO3 for Nitrate. If they are to...Read More

3 Answers

659 views
R. Jones, Student
Answered: May 17, 2019
The correct answer to this question is B, 43.2 g. The mass of the glucose in one mole is calculated and then compared. First, one must identify that there are : 12 H = 1.0079g x 12 =12.0948 g , 6...Read More

2 Answers

647 views
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

635 views
J. Harty, Writer
Answered: Mar 28, 2019
The correct answer to this question is B, Iron(II) oxide. Iron(II) oxide is also know as ferrous oxide following the older system of naming conventons. It is an inorganic compound. Since Oxygen...Read More

2 Answers

620 views
Ken Wilson, Marketing Analyst
Answered: Jan 17, 2019
The correct answer is B. Isotopes are atoms having the same number of protons of the same element but with a different number of neutrons. Base on the choices, letter B is the only option that...Read More

2 Answers

603 views
MaryNoblesHancock
Answered: Jun 06, 2020
Conducting electricity

1 Answer

602 views
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