Elements & Compounds

Question 1

Name the element for Fe

Answer 1

Iron

Question 2

State the elements and the no. of atoms in H2O

Answer 2

2 Hydrogen
1 Oxygen

Question 3

What is an element?

Answer 3

An element is a pure substance that is made from a single type of atom.

Question 4

What is a Molecule?

Answer 4

A molecule is a group of atoms joined together.

Question 5

What is a Compound?

Answer 5

A compound is a substance formed when two or more different elements
are chemically bonded together.

Question 6

Is Sodium chloride a compound or an element?

Answer 6

A compound - It has two elements combined.

Question 7

how many elements does iron sulfate consist of?

Answer 7

iron + sulfur + oxygen

Question 8

What does the ending -ate or -ite in a compound mean?

Answer 8

It means that there are 3 elements in the compound one of which will always be oxygen.

Question 9

What does the ending -ide in a compound mean?

Answer 9

It means that there are 2 elements in the compound.

Question 10

What is Calcium, carbon and oxygen as a compound?

Answer 10

Calcium Carbonate.

Question 11

The molecules of glucose is C6H12O6. What is inside and how many atoms are there of each element?

Answer 11

6 Carbon
12 Hydrogen
6 Oxygen

Question 12

What is the formula for Carbon dioxide

Answer 12

CO2

Question 13

Where are Alkali metals found on the periodic table and what is their reactivity?

Answer 13

The far left column of the periodic table, not including Hydrogen. (Group 1) They are are among the most reactive metals.

Question 14

Where are the Transition Metals found on the periodic table and what is their reactivity?

Answer 14

The middle of the periodic table from Scandium to Zinc and Downwards. They are much less reactive than the alkali.

Question 15

Where are the Noble Gases found on the periodic table and what is their reactivity?

Answer 15

The far right column of the periodic table (Group 8 or 0). They are highly unreactive, therefore known as “noble”.

Question 16

Where are the Halogens found on the periodic table and what is their reactivity?

Answer 16

They are the second last column to the right of the periodic table (Group 7). They are highly reactive and highly toxic.

Question 17

How do you test for conductivity of an element? (Remember to revise diagram).

Answer 17

You connect the element to a battery pack using crocodile clips and wires. Connect one wire between the battery pack and the element, one between the element and a light bulb and one between the light bulb to the end of the battery pack. If it lights up, the element is a conductor. If not then it isn’t.

Question 18

If the bulb lit up what was the element?

Answer 18

A metal.

Question 19

If the bulb did not light up what was the element?

Answer 19

An insulator.

Question 20

What type of materials conduct electricity?

Answer 20

Metal will conduct electricity, non-metals won’t except carbon in the form
of graphite.

Question 21

What is electrolysis?

Answer 21

Electrolysis is a technique which uses electricity to split a compound into the elements it is made up of.

Question 22

What happened and what did you do during the Electrolysis experiment?

Answer 22

We placed 2 electrodes, which were connected to a battery pack with wires, inside the light blue copper chloride liquid. After a minute or so, the water around one electrode began to bubble and you could smell the chlorine, showing that chlorine gas had formed. Around the other electrode, a thin layer of copper had begun to form and was covering the part of the electrode which was in the water. This showed that the copper and the chlorine had separated and were now 2 separate elements instead of the compound, Copper Chloride.

Question 23

What element is Cu

Answer 23

Copper.

Question 24

What is each element given?

Answer 24

Each element is given a symbol and an atomic number.