NSD61 9 Science Unit B Matter & Chemical Change PAT PREP

A teacher challenged a group of students to identify an unknown white solid. The students recorded the following results in their investigation. Which of the tests listed above provides evidence of a chemical property of the unknown solid?

• A

• B

• C

• D

A type of reaction that produces a change like the one shown in the graph above is

• corrosion

• exothermic

• combustion

• endothermic

In an experiment, 12.0 g of solid carbon, C(s), reacted with oxygen gas, O2(g), to form 44.0 g of carbon dioxide gas, CO2(g).

If all 12.0 g of carbon reacted, how many grams of oxygen reacted with the carbon?

• 12 g

• 32 g

• 44 g

• 56 g

Copper has been used to produce metal coins because it is

• non-reactive with most acids

• not readily reactive with oxygen • malleable

Which of the elements on the periodic table above would be another appropriate metal to use for producing metal coins based on its similar properties to copper?

• iron

• silver

• mercury

• potassium

Which group of elements on the periodic table has the least reactive elements?

• Group 1

• Group 2

• Group 17

• Group 18

Which of the following rows identifies the three elements present in washing soda, Na2CO3(s)?

• A

• B

• C

• D

Which of the following diagrams best represents molecules of water?

• 
• 
• 
• 

Which pair of compounds below can be classified as ionic compounds?

• C6H6(l) and BeF2(s)

• C6H6(l) and NO2(g)

• LiCl(s) and BeF2(s)

• LiCl(s) and NO2(g)

In a science class, students saw a copper precipitate, Cu(s), appear in a solution of copper(II) sulfate, CuSO4(aq), after a piece of zinc, Zn(s), was added to the solution.

Which of the following chemical equations represents the reaction described above?

• CuSO4(aq) + ZnSO4(aq) → Cu(s) + Zn(s)

• Cu(s) + ZnSO4(aq) → Zn(s) + CuSO4(aq)

• Zn(s) + ZnSO4(aq) → Cu(s) + CuSO4(aq)

• Zn(s) + CuSO4(aq) → Cu(s) + ZnSO4(aq)

Which of the following actions best describes how to safely deal with a material with the above WHMIS symbol after working with it?

• Place it in a biohazardous-waste bin for collection.

• Dilute it with water before pouring it down the drain.

• Combine it with a sand–gravel mixture before disposing of it.

• Place it in a lead-lined container for radioactive-waste collection.