Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Nat 5 Chemistry > Module 2- Teachers Flashcards > Flashcards

Module 2- Teachers Flashcards

1
Q

What do chemists call the forces which hold atoms together?

A

Bonds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What happens to outer electrons in a covalent bond?

A

There shared between two nuclei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What the definition of a covalent bond

A

The electrostatic attraction if two positive nuclei for a shared pair of electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What type of elements join together by covalent bonding?

A

Non-metal elements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How many atoms make up a diatomic molecule?

A

Two atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Name the 7 diatomic molecules?

A

Hydrogen, nitrogen, fluorine, oxygen, iodine, chlorine, bromine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Name the two types of covalent compounds?

A

Covalent network
Covalent molecule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

State the definition of a molecule

A

A group of non-metal atoms joined together

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Is the nucleus of an atom positively or negatively charged?

A

It has a positive charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What charge do electrons have

A

Electrons are negatively charged

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Give the names (and charges) of the subatomic particles present in atoms.

A

protons (positive), neutrons (neutral) and electrons (negative)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Why is an atom neutral ?

A

It is neutral because the number of protons (or positive charge on nucleus)
= number of electrons (or negative charges).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

State the location and charge on a proton, neutron and electron.

A

Proton - one positive (in nucleus)
Electron - one negative (outside nucleus)
Neutron - neutral (in nucleus)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the atomic number of an atom?

A

The atomic number is the number of protons in the nucleus of an atom.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is meant by the mass number?

A

This is the number of protons + neutrons in the nucleus of an atom.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Can you state what is meant by the term isotope ?

A

Same atomic number or number of protons
Different mass number or number of neutrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is meant by relative atomic mass?

A

This is the average mass of an element taking into account the number and proportions of each isotope

18
Q

How are electrons arranged in an atom?

A

Electrons are arranged in energy levels. There are 2 electrons in the 1st energy level or 8 in the 2nd energy level

19
Q

How many protons, electrons and neutrons in 23Na ?

A

11 protons
11 electrons
12 neutrons

20
Q

What type of elements are conductors of electricity?

A

Metals elements and carbon

21
Q

Do covalent compounds conduct electricity?

A

No. The do not conduct electricity as there are no charged particles which are free to move.

22
Q

Why do atoms react together?

A

Atoms form bonds to reach a stale electron arrangement

23
Q

In which state do metals conduct

A

Solid, molten or dissolved in water

24
Q

What kind of bonding is present between non-metal atoms ?

A

Covalent bonding

25
Q

When do covalent compounds conduct electricity?

A

Never. They do not conduct electricity

26
Q

What kind of bonding is present between metals and non-metal elements when they combine?

A

Ionic bonding

27
Q

When do ionic compounds conduct electricity and why?

A

Ionic compound only conduct either in a molten state or when dissolved in water as
IONS CAN MOVE

28
Q

Why do covalent networks have very high melting points?

A

Covalent networks have very high melting points as lots of strong covalent bonds have to be broken which needs lots of energy

29
Q

Explain why covalent molecules have low melting points?

A

Covalent molecules have low melting points as there are weak forces of attraction between the molecules

30
Q

What is meant by electrolysis ?

A

The process of breaking up an ionic compound by means of electricity to form its element

31
Q

What is an ion?

A

It’s an atom that has lost or gained an electron

32
Q

What kind of compounds are liquids and gases at room temperature?

A

Covalent compounds

33
Q

During electrolysis what happens to each electrode?

A

In electrolysis of an ionic compound the positive metal ions move to the negative electrode. The negative non-metal ions move to the positive electrode.

34
Q

Definition of a metallic bond?

A

Metallic bonding is the electrostatic attraction between positively charges ions and delocalised electrons.

35
Q

Why does d.c. have to be used in electrolysis

A

A d.c. source is used to keep a constant positive and negative electrode and allow the products to be identified

36
Q

Definition of an ionic bond?

A

An ionic bond is the electrostatic attraction between positive and negative ions

37
Q

Why does ionic compounds only conduct when molten or in solution and not when solid?

A

The ions are free to move in a molten state. They are tightly held in a lattice and the ions cannot move in a solid

38
Q

How would you describe the melting point of ionic compounds

A

Ionic compounds have high melting points as it takes a lot of energy to break the strong ionic bonds and break up the ionic lattice.

39
Q

What type of structure do solid ionic compounds exist

A

They exist as a lattice of oppositely charged ions.

40
Q

Why do metals conducts?

A

They have delocalised electrons

Nat 5 Chemistry (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions