National 5 Chemistry - Unit 1 - Rates of Reactions

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What can be said about the green line?

• it is a faster rate of reaction

• It produces same volume of product as red line

• Half the volume of reactants has been used

Which would not speed up a chemical reaction?

• Using a large beaker

• Increasing the concentration

• Decreasing particle size

• adding a catalyst

Which would have the slowest rate of reaction

• Magnesium ribbon 1M HCl at 20 degrees

• Magnesium powder 1M HCl at 20degrees

• Magnesium ribbon 0.5M HCl at 10degrees

• Magnesium powder 0.5M HCl at 10degrees

In an experiment, a 2 g lump of zinc and 2 g of powdered zinc are added separately to equal volumes of dilute sulphuric acid. The solid line on the graph shows the volume of gas given off when the 2 g lump is used. Which dotted line is obtained when the zinc is powdered? 

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Tags

NGSS.HS-PS1-5

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