Atoms, Elements, Molecules and Compounds Practice exercise 2

Question 1

Which of the following is a pure substance that cannot be split into simpler substances by chemical means?

Question 2

Which of the following is a pure substance that cannot be split into simpler substances by chemical means?(1 mark)

Question 3

Which of the following is a pure substance that cannot be split into simpler substances by chemical means?(1 mark)

Question 4

Which of the following is a pure substance that cannot be split into simpler substances by chemical means?(1 mark)

Question 5

Which of the following is a pure substance that cannot be split into simpler substances by chemical means?  (1 mark)

Question 6

Which of the following is an example of an element?

Question 7

Which of the following is an example of an element?(1 mark)

Question 8

Which of the following is an example of an element?(1 mark)

Question 9

Which of the following is an example of an element?(1 mark)

Question 10

Which of the following is an example of an element?(1 mark)

Question 11

Which of the following shown in the diagram below is an example of an element? (1 mark)

Question 12

Which of the following shown in the diagram below is an example of an element? (1 mark)

Question 13

Which of the following shown in the diagram below is an example of an element? (1 mark)                  

Question 14

What is the smallest particle of an element that can take part in a chemical change?

Question 15

What is the smallest particle of an element that can take part in a chemical change?(1 mark)

Question 16

What is the smallest particle of an element that can take part in a chemical change?(1 mark)

Question 17

What is the smallest particle of an element that can take part in a chemical change?(1 mark)

Question 18

What is the smallest particle of an element that can take part in a chemical change?  (1 mark)

Question 19

What is a molecule?

Question 20

What is a molecule?(1 mark).

Question 21

What is a molecule?(1 mark).

Question 22

What is a molecule?(1 mark).

Question 23

What is a molecule?(1 mark).

Question 24

What is a molecule?  (1 mark).

Question 25

What is a compound made up of?

Question 26

What is a compound made up of?.(1 mark)

Question 27

What is a compound made up of?.(1 mark)

Question 28

What is a compound made up of?.(1 mark)

Question 29

What is a compound made up of?  (1 mark)

Question 30

An electrician uses pure copper wires to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or compound?

Question 31

An electrician uses pure copper wires to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or compound?(1 mark)

Question 32

An electrician uses pure copper wires to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or compound?(1 mark)

Question 33

An electrician uses pure copper wires to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or compound?(1 mark)

Question 34

An electrician uses pure copper wires to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or compound?(1 mark)

Question 35

An electrician uses pure copper wires to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or compound?(1 mark)

Question 36

An electrician uses pure copper wires shown below to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or a compound? (1 mark)

Question 37

An electrician uses pure copper wires shown below to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or a compound? (1 mark)

Question 38

An electrician uses pure copper wires shown below to install lights in Nakuru. Copper is made of only copper atoms. Is copper an element or a compound?  (1 mark)

Question 39

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?

Question 40

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?(1 mark)

Question 41

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?(1 mark)

Question 42

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?(1 mark)

Question 43

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?(1 mark)

Question 44

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?(1 mark)

Question 45

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called?(1 mark)

Question 46

In Mombasa, students learn that oxygen in the air exists as O₂, where two oxygen atoms join together. What is this small group of atoms called? (1 mark)

Question 47

A family in Kisumu uses table salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or compound?

Question 48

A family in Kisumu uses table salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or compound?.(1 mark)

Question 49

A family in Kisumu uses table salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or compound?.(1 mark)

Question 50

A family in Kisumu uses table salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or compound?.(1 mark)

Question 51

A family in Kisumu uses table salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or compound?.(1 mark)

Question 52

A family in Kisumu uses table salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or compound?.(1 mark)

Question 53

The image below shows table salt used in a Kisumu kitchen. A family uses this salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or a compound? (1 mark)

Question 54

The image below shows table salt used in a Kisumu kitchen. A family uses this salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or a compound? (1 mark)

Question 55

The image below shows table salt used in a Kisumu kitchen. A family uses this salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or a compound? (1 mark)

Question 56

The image below shows table salt used in a Kisumu kitchen. A family uses this salt when cooking. Table salt is made of sodium and chlorine combined. Is table salt an element or a compound? (1 mark)

Question 57

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound?

Question 58

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound?.(1 mark)

Question 59

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound?.(1 mark)

Question 60

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound?.(1 mark)

Question 61

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound?.(1 mark)

Question 62

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound?.(1 mark)

Question 63

During a science practical in Machakos, students mix carbon and oxygen and form carbon (IV) oxide gas. Is this gas an element or compound? (1 mark)

Question 64

In Nairobi, a chef uses pure oxygen gas to help in food preservation. Based on your knowledge of matter, is oxygen an element or compound?

Question 65