Topic 1 - Key Concepts in Chemistry Flashcards Preview

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Flashcards in Topic 1 - Key Concepts in Chemistry Deck (41)
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1

Define compound

Two or more elements chemically bonded

2

Define element

Substance made up of only one type of atom

3

Mass of a proton

1 AMU

4

Mass of a neutron

1 AMU

5

Mass of an electron

Almost 0, 1/2000 AMU

6

Define mass number

Number of protons + neutrons

7

Define atomic number

Number of protons (in the nucleus)

8

Charge of a proton

+1

9

Charge of a neutron

0

10

Charge of an electron

-1

11

Define a molecule

Two or more atoms bonded together

12

John Newlands and Mendeleev arranged their periodic table in order of...

atomic mass

13

The modern periodic table is arranged in order of...

atomic number (proton number)

14

Explain why Mendeleev left gaps in his periodic table

to make the pattern fit for undiscovered elements

15

Explain why potassium and sodium are in the same group of the periodic table

They both have one electron in their outer shellThey react similarly

16

Explain why chlorine and bromine are group 7 of the periodic table

Both have 7 electrons in their outer shell

17

Explain why chlorine's relative atomic mass is 35.5

Relative atomic mass is an average mass

Chlorine exists as Cl- 35 and Cl-37

75% is Cl-35 and 25% is Cl-37

(35 x 75 ÷ 100) + (37 x 25 ÷ 100) = 35.5

18

Explain why Mendeleev swapped Tellurium and Iodine's position in his periodic table.

-Iodine has similar properties to other group 7 elements

-Iodine had similar chemical reactions to other group 7 elements

-Iodine is also diatomic

19

What subatomic particle did James Chadwick discover?

Neutron

20

How did Mendeleev's periodic table become accepted by scientists?

They discovered the elements he'd left gaps forand they had similar properties to those he'd precited

21

Name two differences between Dalton and Rutherford's model of the atom

Dalton said the atom was solid whereas Rutherford believed the atom was made of mostly empty space

 

Dalton believed that atoms were indestructible whereas the modern model of the atom is made of protons, neutrons and electrons 

22

Name particle A

Electron

23

Which particle would be the electron. Explain your answer.

A

 

as it has the smallest mass so is deflected the most

or 

it has is negative and attracted to the positive plate

24

Name particle B

Neutron/Proton

25

Name particle C

Neutron/Proton

26

Which particle would be the proton. Explain your answer.

C

 

as it has the largest mass so is deflected the least

or 

it has is positive and attracted to the negative plate

27

Which particle would be the neutron. Explain your answer.

B

 

It has no charge so isn't deflected by the magnetic field

28

i) 90

ii) 222

29

What is an isotope?

Atoms of the same element with the same number of protons and different numbers of neutrons

30

Which scientist discovered the neutron?

James Chadwick