Elements, compounds, mixtures and atoms

Question 1

What is an element?

Answer 1

a substance made up of one type of atom

Question 2

What is a compound?

Answer 2

2 or more elements that are chemically combined

Question 3

what is a mixture?

Answer 3

2 or more elements that are not chemically combined

Question 4

what is a species?

Answer 4

anything - if you don’t know what it is

Question 5

what is a particle?

Answer 5

a small bit of stuff

Question 6

What is a molecule?

Answer 6

a small chemically combined collection of atoms like water (2 hydrogen, 1 oxygen)

Question 7

What is a lattice?

Answer 7

a large structure of atoms that are chemically combined (that we can see)

Question 8

What are atoms?

Answer 8

the simplest form an element can exist as

Question 9

What are atoms made of?

Answer 9

3 subatomic particles: electrons, protons and neutrons.

Question 10

What is the mass of an electron?

Answer 10

1/1836

Question 11

What is the mass of a proton?

Answer 11

1

Question 12

What is the mass of a neutron?

Answer 12

1

Question 13

What is the charge of an electron?

Answer 13

negative

Question 14

What is the charge of a proton?

Answer 14

positive

Question 15

What is the charge of a neutron?

Answer 15

neutral (no charge)

Question 16

On the periodic table which number is the atomic mass number?

Answer 16

the top one

Question 17

On the periodic table which number is the atomic number?

Answer 17

the bottom one

Question 18

what does the atomic mass number represent?

Answer 18

protons + neutrons

Question 19

What does the atomic number represent?

Answer 19

number of protons

Question 20

How do we know the number of electrons?

Answer 20

there has to be the same number of protons and electrons so the element doesn’t have an overall charge.

Question 21

What do neutrons do?

Answer 21

hold the protons together to stop them repelling each other

Question 22

How can you tell what period an atom is in?

Answer 22

how many shells it has

Question 23

How can you tell which group an atom is in?

Answer 23

how many electrons it has on its outer shell

Question 24

Why are the noble gases inert?

Answer 24

they have a full outer shell

Question 25

The closer an atom is to a full outer shell, the more …….. it is.

Answer 25

reactive

Question 26

What is an isotope?

Answer 26

if atoms of the same element have the same number of protons but a different number of neutrons and electrons

Question 27

How do you calculate the average mass of an element?

Answer 27

%/100 x mass of isotope 1 + %/100 x mass of isotope 2

Question 28

are mixtures easily separated?

Answer 28

yes