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?

<p>Sulphur (B)</p> Signup and view all the answers

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

<p>1:8 (D)</p> Signup and view all the answers

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

<p>Inert gases (C)</p> Signup and view all the answers

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

<p>H:O = 2:1 (A)</p> Signup and view all the answers

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

<p>Na+ (B)</p> Signup and view all the answers

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

<p>Cation (D)</p> Signup and view all the answers

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

<p>Ions (A)</p> Signup and view all the answers

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

<p>Polyatomic ion (B)</p> Signup and view all the answers

Which term describes a negatively charged ion?

<p>Anion (A)</p> Signup and view all the answers

What does the molecular mass of a substance represent?

<p>The sum of the atomic masses of all the atoms in a molecule (D)</p> Signup and view all the answers

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

<p>6 (C)</p> Signup and view all the answers

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

<p>CaCl2 (D)</p> Signup and view all the answers

What is the correct formula for ammonium sulfate?

<p>(NH4)2SO4 (A)</p> Signup and view all the answers

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

<p>Molecules are always neutral, while polyatomic ions can carry a charge. (C)</p> Signup and view all the answers

What is meant by the term 'chemical formula'?

<p>A shorthand way to represent the elements and their ratio in a compound. (A)</p> Signup and view all the answers

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