Worksheet: Elements, Atoms, and Molecules

In this worksheet, we will practice defining elements, atoms, and molecules and using these terms in the context of materials and physical processes.

Q1:

What is the difference between a sulfur atom and a sulfur molecule?

  • ASulfur atoms can be divided into smaller units, while sulfur molecules cannot.
  • BSulfur atoms consist of multiple sulfur molecules bonded together.
  • CA sulfur molecule consists of multiple sulfur atoms bonded together.
  • DSulfur atoms are reactive, while sulfur molecules are not.

Q2:

Which of the following best describes a molecule?

  • AA single atom of an element
  • BA mixture of different elements
  • CAtoms of two or more elements bonded together
  • DAtoms chemically bonded together in a discrete unit

Q3:

Which of the following best describes an element?

  • AA substance made from more than one type of atom
  • BA pure substance
  • CAny of the fragments that make up a molecule
  • DThe name shared by atoms containing the same number of protons

Q4:

Which of the following is true of an element?

  • AYou can divide up an element into infinitely many pieces.
  • BElements are made of at least two types of atom, bonded together.
  • CAll the atoms of an element have the same number of protons in their nuclei.
  • DElements in the periodic table are arranged in order of increasing mass.
  • EAll elements are found in nature in their pure states.

Q5:

Which of the following is not an element?

  • AUranium
  • BIron
  • CSteel
  • DMolybdenum
  • ECarbon

Q6:

Which of the following is true for molecules?

  • AOnce you make a molecule out of atoms, you cannot get the constituent atoms back.
  • BMolecules have crystalline structures.
  • CMolecules are distinct, covalently bonded collections of atoms.
  • DAll molecules are composed of more than one type of atom.
  • EAll molecules are made of multiple atoms, all of the same type.

Q7:

What is the symbol for an atom of the element chlorine?

  • A C l
  • B C l +
  • C C l
  • D C l 2
  • E C l 2

Q8:

What is the symbol for molecular oxygen?

  • A O 3
  • B 2 O
  • C O
  • D O 3
  • E O 2

Q9:

Which of the following is not a molecule?

  • A C O 2
  • B O 2
  • C N O
  • D N a
  • E N 2

Q10:

What state symbol is used to represent a gas in a chemical equation?

  • A(g)
  • B(gas)
  • C ( O ) 2
  • D(air)
  • E(gs)

Q11:

What state symbol is used to represent a solid in a chemical equation?

  • A(sl)
  • B(s)
  • C(sd)
  • D(solid)
  • E(sld)

Q12:

What is the total number of atoms in the following molecule?

CCHOHHH

Q13:

Thionyl chloride is a gas with the chemical formula SOCl2. Which diagram could represent pure SOCl2?

  • A
  • B
  • C
  • D
  • E

Q14:

What state symbol is used to represent a liquid in a chemical equation?

  • A(aq)
  • B ( H O ) 2
  • C(l)
  • D(lq)
  • E(w)

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