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18 Questions

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Chemistry: Molecules of Elements

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Questions and Answers

What is a molecule?

A group of different elements bonded together

A substance that shows the properties of the element or compound it belongs to (correct)

The smallest particle of an element

The smallest particle of a compound

How many atoms are present in a diatomic molecule of oxygen?

Two (correct)

Four

One

Three

What is the atomicity of a molecule?

Number of neutrons in the nucleus

Number of electrons in the outer shell

Number of protons in the nucleus

Number of atoms constituting the molecule (correct)

Which element forms a polyatomic molecule?

Sulphur Signup and view all the answers

In the compound water, what is the ratio by mass of hydrogen to oxygen?

1:8 Signup and view all the answers

Which type of element consists of molecules made up of only one atom?

Inert gases Signup and view all the answers

What is the ratio by number of atoms for a water molecule?

H:O = 2:1 Signup and view all the answers

In the compound NaCl, what is the charge on the sodium ion?

Na+ Signup and view all the answers

What type of ion is formed when a group of atoms has a net positive charge?

Cation Signup and view all the answers

What are charged particles in compounds composed of metals and nonmetals known as?

Ions Signup and view all the answers

What is the term for a group of atoms carrying a charge?

Polyatomic ion Signup and view all the answers

Which term describes a negatively charged ion?

Anion Signup and view all the answers

What does the molecular mass of a substance represent?

The sum of the atomic masses of all the atoms in a molecule Signup and view all the answers

How many atoms are present in a single molecule of CaCl2?

6 Signup and view all the answers

Which chemical formula does not require brackets when written without ambiguity?

CaCl2 Signup and view all the answers

What is the correct formula for ammonium sulfate?

(NH4)2SO4 Signup and view all the answers

What is the major difference between a molecule and a polyatomic ion?

Molecules are always neutral, while polyatomic ions can carry a charge. Signup and view all the answers

What is meant by the term 'chemical formula'?

A shorthand way to represent the elements and their ratio in a compound. Signup and view all the answers