EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100

Zinc and iodine solution react like this:

Zn(s)+ I2(aq) ZnI2(aq)

The rate of reaction can be followed by measuring the mass of zinc metal at regular intervals, until all the iodine has been used up.

What will happen to the mass of the zinc, as the reaction proceeds?

Important Questions on The Speed of a Reaction

EASY
Upper Secondary: IGCSE
IMPORTANT

Zinc and iodine solution react like this:

Zn(s)+ I2(aq) ZnI2(aq)

The rate of reaction can be followed by measuring the mass of zinc metal at regular intervals, until all the iodine has been used up.

Which reactant is in excess? Explain your choice.

EASY
Upper Secondary: IGCSE
IMPORTANT

Zinc and iodine solution react like this:

Zn(s)+ I2(aq) ZnI2(aq)

The rate of reaction can be followed by measuring the mass of zinc metal at regular intervals, until all the iodine has been used up.

The reaction rate slows down with time. Why?

EASY
Upper Secondary: IGCSE
IMPORTANT

Zinc and iodine solution react like this:

Zn(s)+I2(aq)ZnI2 (aq)

The rate of reaction can be followed by measuring the mass of zinc metal at regular intervals, until all the iodine has been used up.

Sketch a graph showing the mass of zinc on the y axis, and time on the x axis.

EASY
Upper Secondary: IGCSE
IMPORTANT

Zinc and iodine solution react like this:

Zn(s)+ I2(aq) ZnI2(aq)

The rate of reaction can be followed by measuring the mass of zinc metal at regular intervals, until all the iodine has been used up.

How will the graph change if the temperature of the iodine solution is increased by 10°C?

EASY
Upper Secondary: IGCSE
IMPORTANT

Zinc and iodine solution react like this:

Zn(s)+ I2(aq) ZnI2(aq)

The rate of reaction can be followed by measuring the mass of zinc metal at regular intervals, until all the iodine has been used up.

How will the graph between concentration of zinc and time changes, if the temperature of the iodine solution is increased by 10oC ? Explain your answer using the idea of collisions between particles.

EASY
Upper Secondary: IGCSE
IMPORTANT

Some pondweed is placed as shown:

Question Image

Name the gas that collects in the test tube.

EASY
Upper Secondary: IGCSE
IMPORTANT

Some pondweed is placed as shown:

Question Image

What is the products formed other than oxygen?

EASY
Upper Secondary: IGCSE
IMPORTANT

Some pondweed is placed as shown:

Question Image

This experiment must be carried out in the light. Why?