T2 PS: Rate and Extent of Reaction

Define reaction rate.

Write down the:

Independent variable

• Surface area

• Amount of magnesium

Write down the:

Control variable

• State of division

• Amount of magnesium

Use the information on the graph to:

Calculate the volume of hydrogen gas produced in experiment 1 from  $t\ =\ 2\$  minutes to  $t\ =\ 10$  minutes. Take the molar gas volume as  $25\ dm^3.mol^{-1}$  
You may find the following equation useful:
 $Mg\left(s\right)\ +\ 2HCl\left(aq\right)\ \rightarrow\ MgCl_2\left(aq\right)\ +\ H_2\left(g\right)$  

•  $2,5\ dm^3$  

•  $25\ dm^3$ 

•  $3\ dm^3$ 

Use the information on the graph to:

Calculate the initial mass of magnesium used if the average rate of formation of hydrogen gas in experiment 2 was 2,08 x 10-4 mol∙s-1

• 
  

  $2,5\ dm^3$
  

• $25\ dm^3$

• $3\ dm^3$

For this investigation, write down the function of the:

Graduated syringe

For this investigation, write down the function of the:

Copper(II) oxide

How will you know when the reaction is completed?

Write down the independent variable for this investigation.

Is energy ABSORBED or RELEASED during this reaction?