Final Exam Honors

A hiker seals a plastic bag that contains dried fruits before he climbs a mountain. What will most likely happen to the plastic bag as the hiker reaches the top of the mountain?

• The bag will expand.
• The bag will shrink
• The bag will remain the same size
• the bag will allow air to enter

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Date:

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Which of the following best defines an acid?

• An acid has a pH of 7
• An acid has hydroxide ions.
• An acid has more hydrogen ions in solution.

Which of these substances contributes to soap’s slippery texture?

• an acid
• a base
• carbonate
• water

Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?

• F2 + Na-> NaF2
• F + Na -> NaF
• F2 + Ca -> CaF2
• Ca + F -> CaF2

Which statement best describes the formula equation Cl2(g) + 2KBr(aq) Right arrow. 2KCl(aq)+ Br2(l)?

• Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine.
• Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas.
• Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas.
• Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.

Which chemical equation is unbalanced?

• C + O2 --> CO2
• Sr + O2 --> 2SrO
• 6H2 + 3O2 ----> 6H2O
• H2 + H2 + O2 ---> H2O + H2O

In a chemical equation, which symbol should be used to indicate that a substance is in solution?

• (s)
• (l)
• (g)
• (aq)