363 Best Science Questions and Answers (Q&A) - ProProfs Discuss

Why would dissolving salt in water be considered a physical change?

O. Bickis, Corporate employee
Answered: Jan 14, 2021

Dissolving salt in water is considered a physical change simply because it is only the state of matter that has been changed. Most times, physical changes can be reversed, and you would get your...Read More

11 Answers

647 views

Which part of the plant carries and protects the seed?

Bergeront Tiffney, Computer Engineer
Answered: Jan 28, 2021

The correct answer to this question is the fruit. Apart from being the edible part of a plant, it also functions by carrying and protecting the seed. There are different types of fruits; while...Read More

8 Answers

645 views

What is 'LA Mancha Negra'?

Ken Wilson, Marketing Analyst
Answered: Oct 31, 2018

La Mancha Negra = the black stain. In Venezuela, 1989, a black gooey stain appeared on a stretch of road in Caracas not that far from its airport. At first quite small, it soon stretched to 8...Read More

7 Answers

637 views

What is the lightest halogen?

Bergeront Tiffney, Computer Engineer
Answered: Jan 28, 2021

The lightest halogen is fluorine. Halogens are elements that belong to group 17 of the periodic table. These elements include fluorine, chlorine, bromine, iodine, and astatine. They all fall into...Read More

10 Answers

624 views

Why do polar and non-polar molecules repel?

D. Loukas, Maths Professor
Answered: Jan 18, 2021

Polar molecules occur when two atoms do not engage equally with electrons in a covalent bond and dipole forms. Part of the molecule brings small positive charges. The other part delivers small...Read More

9 Answers

615 views

What is the prefix meaning 1000 called?

John Smith
Answered: Apr 23, 2024

Kilo-

1 Answer

598 views

Which is the strongest acid in the world?

Victoria Martian, Blogger
Answered: Jan 19, 2021

Fluro antimonic acid is the world’s most potent acid. However, there is even now uncertainty as to the possibility that carborane acid is the fiercest of them all. These acids are so strong...Read More

9 Answers

597 views

What is a person who studies earthquakes called?

D. Smith, Musician
Answered: Jan 13, 2021

An individual who studies earthquakes is called a Seismologist. Seismologists are trained Earth scientists who study the vibration or seismic waves of the Earth's interior. Seismologists study...Read More

8 Answers

596 views

Can you state some statements about atoms of elements in the same group of the periodic table?

L. Sevigny, Doctor
Answered: Jul 09, 2018

This means that the elements that are grouped together have the same chemical properties. The elements that are grouped together tend to behave in the same manner. This is the reason why the...Read More

2 Answers

593 views

What is the layer of air that surrounds the earth called?

C. Perez, Writer
Answered: Jan 12, 2021

The layer of air that surrounds the earth is called the atmosphere. About 99 percent of gases in the atmosphere consists of nitrogen and oxygen. Other gases such as neon, carbon dioxide, argon,...Read More

6 Answers

591 views

What energy does a person sitting in a moving car have?

O. Bickis, Corporate employee
Answered: Jan 14, 2021

A man moving in a moving car actually has potential energy, though the car has kinetic energy. The energy that acts on an object in motion is what is simply referred to as kinetic energy, while...Read More

8 Answers

576 views

What would life be like on the Earth-like planet Kepler 186f?

D.Anthonyda
Answered: Feb 08, 2018

A planet known as Kepler-186f is located over 500 light years away from Earth. This planet has many similarities to Earth. First, its size is relatively similar. The distance around the Earth and...Read More

8 Answers

564 views

How do metals like iron exhibit variable valency?

O. Bickis, Corporate employee
Answered: Jan 14, 2021

Metals like iron are examples of transition metals, which is why they exhibit variable valency. All transition metals show this behavior. This happens when the d-orbitals also lose their valence...Read More

9 Answers

563 views

Which is more important, physics or biology (and why)?

D.Anthonyda
Answered: Feb 08, 2018

Physics is the science which deals with the matter and energy. It involves the nature and properties of these things. Biology, on the other hand, deals with the living things in this world....Read More

8 Answers

555 views

What is the commonest element on Jupiter?

O. Bickis, Corporate employee
Answered: Jan 14, 2021

The commonest element on Jupiter is hydrogen, but not the only hydrogen; helium also is considered the commonest element on Jupiter. Jupiter happens to be the biggest planet in the universe....Read More

9 Answers

545 views

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