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

How would you account for the fact that the F- ion is smaller than the O2- ion?

Yashu Dhiman, Content Writer
Answered: Nov 19, 2020

F ion is basically Fluoride ion, and O2 is oxygen ion. The fact that fluoride ion is smaller than Oxygen ion is because fluoride has an extra proton in the nucleus area, which holds the electrons...Read More

2 Answers

1733 views

Which of the following statements are true for pure substances?

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

1 Answer

1680 views

What is the chemical name for PbO2?

J. Harty, Writer
Answered: Mar 28, 2019

The correct answer to this question is lead(IV) oxide. First, you must determine the type of compound you are working with. Then you must apply the naming convention rules to name the type of...Read More

2 Answers

1677 views

Which symbols represent atoms that are isotopes?

John Smith
Answered: Apr 19, 2024

O-16 and O-18

Isotopes are atoms of the same element (same atomic number) but with a different number of neutrons (different atomic mass).

2 Answers

1585 views

What is the charge of phosphate in K3PO4?

T. Moore, Writer
Answered: Nov 27, 2018

The correct answer is (- 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 elements...Read More

3 Answers

1573 views

Which formula represents a molecular substance?

N. Kingsley, Writer
Answered: Jul 17, 2018

Carbon monoxide or CO is the molecular substance in this equation. In order to form a molecule, the atoms must share their electrons rather than completely give or take them away. On all the...Read More

2 Answers

1539 views

Which three groups of the Periodic Table contain the most elements classified as metalloids (semimetals)?

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 of 14, 15, and 16. The list of...Read More

3 Answers

1530 views

Which periodic element can expand its valence shell to accommodate more than eight electrons?

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

1460 views

Which of the following statements is not true about gases?

K. Myers, Blogger
Answered: Oct 09, 2018

Gases have no definite volume and the volume changes depending on its container. Gases are also compressible and the molecules of gases are more distant from each other compared to liquids’...Read More

3 Answers

1426 views

What is not true of a compound?

E. Austin
Answered: Nov 27, 2018

If substances keep their individual properties, then they are not combining. All the other example answer do involve elements or ingredients mixing together to form an altered substance. Whether...Read More

3 Answers

1381 views

What is the chemical name for PCl5?

J. Harty, Writer
Answered: Mar 28, 2019

The correct answer to this question is phosphorus pentachloride. The P stands for Phosphorus, while the Cl represents chloride. The 5 means that there are 5 Cl atoms bonded to the Phosphorus...Read More

2 Answers

1364 views

Which of the following is not a characteristic of a gas?

John Smith
Answered: Apr 19, 2024

All of these are characteristics of gases

1 Answer

1314 views

What is the percent by mass of potassium nitrate in a solution made from 45.0g KNO3 and 295 mL of water?

Matz Lewis Clark, College student
Answered: May 01, 2019

The correct answer is 13.3%.
First, let’s calculate the mass of water
Mass of water = 295ml * 0.997g/ml
= 294 g
To calculate % by mass of potassium nitrate in the...Read More

2 Answers

1309 views

Which has the greater buoyant force on it?

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

1309 views

What is the correct formula for Lead IV Nitrate?

T. Moore, Writer
Answered: Jan 17, 2019

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 form a compound it will be Pb 4+ and (NO3)-. In-laws of...Read More

2 Answers

1306 views

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