Applications of physical and chemical changes Practice exercise 4

Question 1

The diagram below shows a hoe left outside during rain. Brown rust has formed on the blade. What type of change has occurred on the hoe?  (1 mark)

Question 2

The diagram below shows a hoe left outside during rain. Brown rust has formed on the blade. What type of change has occurred on the hoe?  (1 mark)

Question 3

The diagram below shows a hoe left outside during rain. Brown rust has formed on the blade. What type of change has occurred on the hoe?  (1 mark)

Question 4

The diagram below shows a hoe left outside during rain. Brown rust has formed on the blade. What type of change has occurred on the hoe?  (1 mark)

Question 5

The diagram below shows a hoe left outside during rain. Brown rust has formed on the blade. What type of change has occurred on the hoe?  (1 mark)

Question 6

A family uses charcoal in a jiko to cook their evening meal. What type of change occurs when the charcoal burns?  (1 mark)

Question 7

A family uses charcoal in a jiko to cook their evening meal. What type of change occurs when the charcoal burns?  (1 mark)

Question 8

A family uses charcoal in a jiko to cook their evening meal. What type of change occurs when the charcoal burns?  (1 mark)

Question 9

A family uses charcoal in a jiko to cook their evening meal. What type of change occurs when the charcoal burns?  (1 mark)

Question 10

A student heats salty water until steam rises and white salt is left behind as shown in the diagram below. What type of change happened when the salt was separated?  (1 mark)

Question 11

A student heats salty water until steam rises and white salt is left behind as shown in the diagram below. What type of change happened when the salt was separated?  (1 mark)

Question 12

A student heats salty water until steam rises and white salt is left behind as shown in the diagram below. What type of change happened when the salt was separated?  (1 mark)

Question 13

A student heats salty water until steam rises and white salt is left behind as shown in the diagram below. What type of change happened when the salt was separated?  (1 mark)

Question 14

Fatuma had a broken candle. She melted the wax, poured it into a mold, and made a new candle. What kind of change took place in the wax?  (1 mark)

Question 15

Fatuma had a broken candle. She melted the wax, poured it into a mold, and made a new candle. What kind of change took place in the wax?  (1 mark)

Question 16

Fatuma had a broken candle. She melted the wax, poured it into a mold, and made a new candle. What kind of change took place in the wax?  (1 mark)

Question 17

Fatuma had a broken candle. She melted the wax, poured it into a mold, and made a new candle. What kind of change took place in the wax?  (1 mark)

Question 18

Otieno boiled river water before drinking it. What type of change happened during boiling?  (1 mark)

Question 19

Otieno boiled river water before drinking it. What type of change happened during boiling?  (1 mark)

Question 20

Otieno boiled river water before drinking it. What type of change happened during boiling?  (1 mark)

Question 21

Otieno boiled river water before drinking it. What type of change happened during boiling?  (1 mark)

Question 22

In a Kisumu shop, a vendor churns ice cream while cooling it. Why is freezing needed in ice cream making?

Question 23

In a Kisumu shop, a vendor churns ice cream while cooling it. Why is freezing needed in ice cream making?   (1mark)

Question 24

In a Kisumu shop, a vendor churns ice cream while cooling it. Why is freezing needed in ice cream making?   (1mark)

Question 25

In a Kisumu shop, a vendor churns ice cream while cooling it. Why is freezing needed in ice cream making?   (1mark)

Question 26

In a Kisumu shop, a vendor churns ice cream while cooling it. Why is freezing needed in ice cream making? (1mark)

Question 27

After milking cows in Eldoret, farmers place milk cans in a basin filled with ice blocks. Why does this help preserve the milk?

Question 28

After milking cows in Eldoret, farmers place milk cans in a basin filled with ice blocks. Why does this help preserve the milk?   (1mark)

Question 29

After milking cows in Eldoret, farmers place milk cans in a basin filled with ice blocks. Why does this help preserve the milk?   (1mark)

Question 30

After milking cows in Eldoret, farmers place milk cans in a basin filled with ice blocks. Why does this help preserve the milk?   (1mark)

Question 31

After milking cows in Kiganjo, farmers place milk cans in a basin filled with ice blocks. Why does this help preserve the milk? (1mark)

Question 32

In a Nairobi home, sukuma wiki is steamed instead of boiled. Why is steaming a healthy choice?

Question 33

In a Nairobi home, sukuma wiki is steamed instead of boiled. Why is steaming a healthy choice?   (1mark)

Question 34

In a Nairobi home, sukuma wiki is steamed instead of boiled. Why is steaming a healthy choice?   (1mark)

Question 35

In a Nairobi home, sukuma wiki is steamed instead of boiled. Why is steaming a healthy choice?   (1mark)

Question 36

In a Nairobi home, sukuma wiki is steamed instead of boiled. Why is steaming a healthy choice? (1mark)

Question 37

Look at the image below showing a steam iron in use. What change of state helps remove wrinkles from clothes?

Question 38