Topic 1: Atomic structure and the periodic table

Question 1

Atoms don’t have an overall 1_____ as it has an equal number of 2_____ and 3_____.

Answer 1

1) charge
2) protons (positive)
3) electrons (negative)

Question 2

Where is most of the mass in an atom?

Answer 2

Nucleus

Question 3

What is the relative charge of an electron?

Answer 3

-1

Question 4

What is the relative charge of a proton?

Answer 4

+1

Question 5

What is the relative charge of a neutron?

Answer 5

0

Question 6

How do you work out the number of neutrons?

Answer 6

Mass number - Proton number

Question 7

How do you work out the number of protons?

Answer 7

The atomic number

Question 8

How many electrons does a 2+ ion have?

Answer 8

Protons -2

Question 9

How many electrons does a 3- ion have?

Answer 9

Protons +3

Question 10

Can atoms contain different numbers of protons?

Answer 10

No because that would change the element

Question 11

Are atoms the smallest part of an element?

Answer 11

Yes

Question 12

What is an isotope?

Answer 12

An element with the same number of protons but a different number of neutrons so will change the mass.

Question 13

What is the chemical formula for ammonia?

Answer 13

NH_3

Question 14

What is the definition of a compound?

Answer 14

Contains two elements chemically combined

Question 15

What is NaCl?

Answer 15

Sodium chloride

Question 16

Which one of these is not a compound?
A- C2 H4
B- O2
C-H2 O

Answer 16

B is not a compound

Question 17

How many atoms in a molecule of C2 H4?

Answer 17

6

Question 18

The reactants are on the right of an equation?

true of false

Answer 18

False the products are on the right

Question 19

The products are on the right of an equation?

true or false

Answer 19

True

Question 20

What is symbol equation for;

Sodium (Na) + chlorine (Cl2) –> Sodium chloride (NaCl)

Answer 20

2Na + Cl2 –> 2NaCl

Question 21

Is air an
A- element
B- Mixture
C- Compound

Answer 21

Mixture because it contains two or more elements or compounds that are not chemically combined

Question 22

What is a mixture?

Answer 22

Two or more elements that are not chemically combined

Question 23

Are chemical properties changed when an element is in a mixture?

Answer 23

No the properties are the same

Question 24

In chromatography why is the line at the bottom of the paper drawn in pencil?

Answer 24

Because if it was pen then the line would be separated into its colors

Question 25

How would you separate a soluble from a non soluble solution?

Answer 25

You can pour water and dissolve the soluble element then you could filter it to be left with the non soluble element and a mix of water and the second element, so then you could evaporate the mixture so you are left with the second element.