Semester 2 physical science exam

Which compound shows a correctly written formula between the atoms shown?

• AlAr

• AlAr₃

• AlCl

• AlCl₃

• Combination

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

If reaction starts with 20g of reactants it should produce... 

• a total of 40g of product
• a total of 10g of product
• a total of 80 g of product
• a total of 20g of product

A chemical reaction that absorbs heat

• Single replacement
• Exothermic
• Endothermic
• Decomposition

If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be

• 4CO₂ + 3H₂O
• 3CO₂ + 4H₂O
• 2CO₂ + 3H₂O
• 3CO + 4H₂O

Which of the following is appropriate for determining the the IUPAC nomenclature for N₂O?

• Locate the position of the metal ion in N₂0.

• The prefixes should be used for both nitrogen and oxygen.

• Use Roman numeral II for the nitrogen since it has 2 atoms.

• A prefix is only needed for nitrogen because each molecule

  contains 2 nitrogen atoms.

Which of the following lists of elements is ordered by increasing number of valence electrons?

• Li, C, O, F

• F, O, N, C

• O, S, Se, Te

• Sr, Ca, Mg, Be

When forming a bond, which ion will aluminum form?

• –5 ion

• -3 ion

• +3 ion

• +5 ion

What reaction has the following general formula:

A + B --> AB

• Combination

• Decomposition

• Single Replacement

• Double Replacement

• Combustion