chemistry paper 1 pt1

Question 1

define:

element

compound

Answer 1

element: substance only containing one type of atom

compound: substance containing 2+ different types of atoms chemically bonded

Question 2

what is the atomic number

Answer 2

the number on the bottom of an element also the number of protons and electrons the element has

Question 3

what is the mass number

Answer 3

the top number

number of protons + neutrons = mass number

Question 4

what does the group of an element tell us?

Answer 4

the number of electrons in the outer shell

Question 5

what is metallic bonding?

Answer 5

how metal atoms bond

form a lattice (grid) of ions surrounded by a sea of delocalised electrons

Question 6

what is ionic bonding?

Answer 6

metals bond to non metals

metal atoms donate electrons to non metals to form ions surrounded

Question 7

why do ionic substance have high melting/ boiling points

Answer 7

due to strong ionic bonds

(ions have strong electrostatic forces between them)

Question 8

what is covalent bonding?

Answer 8

non metals bonding together

they share electrons from the outer shell