Chemistry

Question 1

Helium (He)

Answer 1

Used in party balloons

Question 2

Neon (Ne)

Answer 2

Used in advertising signs (Las vegas)

Question 3

Argon (Ar)

Answer 3

Used in lightbulbs to stop the filament reacting with oxygen

Question 4

Krypton (Kr)

Answer 4

Used in lasers designed for laser eye surgery

Question 5

Group 7

Answer 5

• As you go down group 7 the boiling point increases
• As you go down the group the electrons get further away from the nucleus. This means they experience less attraction so it is harder to gain an electron when the element reacts. At his means reactivity decreases down the group

Question 6

Group 1

Answer 6

Reactivity increases as you go down in group 1

Question 7

Lithium (Li)

Answer 7

• Alkali metal

* Floats on the water and gives off hydrogen gas

Question 8

Sodium (Na)

Answer 8

• Alkali metal

* Reacts quicker than lithium(Rolled into ball)

Question 9

Potassium (K)

Answer 9

Reacts more quicker than sodium the hydrogen gas catches a light to give a flame

Question 10

Electronic configuration

Answer 10

•Electrons are found in shells 
•Each shell can hold a maximum number of electrons
-1st= 2
-2nd = 8
-3rd = 8
-4th = 2

Question 11

Atoms

Answer 11

•No electrical charge (They always have the same number of electrons)

Question 12

Isotopes

Answer 12

A version of an element with a different number of neutrons but the same number of protons and electrons

Question 13

Fractional distillation

Answer 13

•Seperation of a liquid mixture to fractions differing in boiling point. Chemical compounds are separated by heating them to a temperature at which one or more fractions of a the mixture will vaporise

Question 14

Crude oil

Answer 14

Seperated by fractional distillation