Measuring Rate of Reactions

What is the rate of reaction?

• How fast a reaction is 
• How big a reaction is
• How loud a reaction is
• How much gas a reaction produces

Tags

NGSS.HS-PS1-5

What method can NOT be used to collect gas?

• Using a gas syringe
• Collecting it in a measuring cylinder under water
• Measuring the change in mass
• Seeing how quickly the solution goes cloudy

The reaction between zinc and hydrochloric acid may be represented by the equation:

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g);

In an investigation of this reaction using excess Zn and 2 M HCl(aq) in an open flask, the graph shown was plotted from the data collected.

Which of the following would be a suitable quantity for the vertical axis of the graph?

• mass of zinc per second

• volume of hydrogen gas produced per second

• Temperature.

• mass loss per second

Tags

NGSS.HS-PS1-5

The word for a substance created in a chemical reaction...

• Reaction

• Reactant

• Product

• Mass

How is this equipment being used to measure the rate of reaction?

• The gas syringe measures how much gas is produced in a certain time

• The reaction mixture will increase in volume in a certain time

Tags

NGSS.HS-PS1-5

If 5cm3 of gas is produced in 20 secs what is the average rate of reaction?

• 5cm3s-1

• 0.25cm3s-1

• 4cm3s-1

why is the reaction fastest at the start ?

• The reactants are in their greatest concentration

• this statement is untrue the reaction is same rate through out whole reaction

Tags

NGSS.HS-PS1-5

To measure the speed of a reaction you will use one of the following equipment.

• Petri dish
• Stop watch
• stirring rod
• Universal indicator

Tags

NGSS.HS-PS1-5

The graph shows how the total volume of a gas given off from a reaction changes with time. In which time interval is least gas given off? 

• A
• B
• C
• D

Which unit is correct for the rate of reaction?

• g mol^-1

• g min^-1

• mol dm^-3

• kJ mol^-1

Tags

NGSS.HS-PS1-5