Copper has 2 isotopes; 69% is Cu 63 and 31% is Cu 65. What is the RAM?

RAM = (69 x 63) + (31 x 65) / 100 = 63.62

Which is not a property of graphene?

It has ions which are free to move

In 1900s JJ Thomson’s plum pudding model stated that the atom consisted of;

+ve charged with -ve charged electrons scattered through it

which is correct about isotopes of an atom?

Same no. of electrons and protons, different no. of neutrons

Why does graphite conduct electricity?

The delocalised electrons are free to move

Why do the elements in group 0 not react?

They have full outer electron shells

What was special about Mendeleev's periodic table?

He left gaps for elements that had not yet been discovered

What did Ernest Rutherford conclude from his alpha particle scattering experiment?

Most is empty space with a nucleus and electrons surrounding

Why do simple molecular compounds have low melting points?

They have weak intermolecular forces

Which correctly shows the properties of an ionic compound?

Conduct electricity when molten or dissolved

Why are metals good conductors of electricity?

They have delocalised electrons which can move

Why does Diamond have a high melting point?

There are many strong covalent bonds

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key Concepts Chemistry

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Edexcel combined Science chemistry Atomic structure periodic table Ionic, covalent and metallic bonding

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Questions 25

Answers

1
Copper has 2 isotopes; 69% is Cu 63 and 31% is Cu 65. What is the RAM?
RAM = (69 + 31) x 100 = 10000
RAM = 63 + 65 /2 = 64
RAM = (69 x 63) + (31 x 65) / 100 = 63.62
RAM = (69 + 63) x (31 + 65) / 100 = 2.28
2
Which metal is the odd one out?
Cobalt
Iron
magnesium
Nickel
3
What does the period tell you about the electronic configuration?
No of electrons in last shell
No of electron shells
No of electrons and protons
No of electrons in nucleus
4
Which is not a property of graphene?
It is a good electrical conductor
It has no fixed formula
It is the lightest known material
It has ions which are free to move
5
What type of bonding occurs between non metal atoms?
electrostatic
metallic
Covalent
Ionic
6
What is the formula of buckminster fullerene?
C45
C200
C60
C100
7
In 1900s JJ Thomson’s plum pudding model stated that the atom consisted of;
Solid spheres that cannot be broken down
+ve charged with -ve charged neutrons scattered through it
+ve charged with -ve charged electrons scattered through it
+ve charged nucleus with electrons surrounding in shells.
8
Which type of bonding is shown here?
Molecular
metallic
Ionic
Covalent
9
What does the group no. tell you about the electronic configuration of an element?
No. of electron shells
No. of electrons in last shell
No. of electrons in first shell
No. of electrons in nucleus
10
When sodium reacts with chlorine, what would the charge be on each ion?
Na+ Cl+
Na- Cl+
Na+2 Cl-2
Na+ Cl-
11
which is correct about isotopes of an atom?
Same no. of protons different no. of electrons
Same no. of electrons and protons, different no. of neutrons
Same no. of electrons different no. of protons
Same mass number different atomic number
12
Why does graphite conduct electricity?
The delocalised electrons are free to move
The delocalised ions are free to move
There are weak intermolecular forces
There are weak forces between the layers
13
Magnesium oxide contains Mg²⁺ and Cl^- ions. What is the formula?
MgCl2
2MgCl
MgCl
Mg2Cl
14
Why do the elements in group 0 not react?
They are all gases
They have no electrons in their outer shell
They have full outer electron shells
They are rare in nature
15
What does the atomic number tell you about an atom?
Number of neutrons
Number of protons and neutrons
Number of protons
Number of electrons and neutrons
16
What does the mass number tell you about an atom?
Number of protons + electrons
Number of electrons
Number of neutrons
Number of protons + neutrons
17
What was special about Mendeleev's periodic table?
He arranged elements into order of no. of neutrons
He arranged elements into rows
He left gaps for elements that had not yet been discovered
He arranged elements into sizes
18
What did Ernest Rutherford conclude from his alpha particle scattering experiment?
Most is empty space with a nucleus and electrons surrounding
-ve charged nucleus with -ve electrons scattered through it
+ve charged electrons surround a nucleus
The atom was like a plum pudding
19
Why do simple molecular compounds have low melting points?
They have weak covalent bonds
They have weak electrostatic forces
They have weak intermolecular forces
They have no ionic bonds
20
Which correctly shows the properties of an ionic compound?
Magnetic
Sonorous
Low melting points
Conduct electricity when molten or dissolved
21
Why are metals good conductors of electricity?
They have molecules which are free to move
They have delocalised electrons which can move
They have ions which are free to move
They have positive and negative ions
22
What type of force holds the ions together?
electromagnetic
molecular
ionic
electrostatic
23
What is the electronic configuration of Potassium?
2.8.8.1
2.8.8.9
2.8.9
8.8.3
24
An atom X has an atomic number of 90 and a mass number of 222. How many electrons?
0
90
222
132
25
Why does Diamond have a high melting point?
There are many strong electrostatic forces
There are many strong metallic bonds
There are many strong ionic bonds
There are many strong covalent bonds

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