AS OCR Chemistry Unit 1

Modules 1, 2 and 3. I have tried to make it hard so that a lot of thought goes into the answers. Good Luck.

 

Please tell me if any of the answers are wrong it took a lot of time to make so I may have been clumsy in some places. :)

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What is Avogadro's constant to three significant figures?
6.02 times 10 to the power of 23
1 of 26
What is the definition of empirical formula?
The simplest whole number ration of atoms of each element present in a compound
2 of 26
At RTP what is the molar volume of any gas?
24dm3
3 of 26
A compound has an empirical formula of SCl and a relative molecular mass of 135.2, find the molecular formula.
S2Cl2
4 of 26
What is the unit that concentration is measured in?
mol dm-3
5 of 26
A student doing a titration found out that 12.5cm3 of aqueous KOH with a concentration of 0.0200 exactly neutralised 25.0cm3 of nitric acid. What is the concentration of the nitric acid? (concentration units have been excluded to avoid giving away answer
0.0100
6 of 26
Ammonium nitrate( NH4NO3) is used as a fertiliser. How much nitrogen does it contain by mass?
35%
7 of 26
What colour and state is anhydrous copper(II) sulphate?
white powder
8 of 26
What is the oxidation number of oxygen bonded in peroxides?
-1
9 of 26
What happens to the first ionisation energy down a group?
deceases
10 of 26
Oxidation and reduction involves only oxygen?
False
11 of 26
How many f orbitals are there?
7
12 of 26
The first ionisation energy of O is greater than the ionisation energy of N?
False
13 of 26
What do successive ionisation energies provide evidence for?
shells
14 of 26
How many electrons does the seventh shell have?
98
15 of 26
What is the electron configuration of O2-? (Not using short hand)
1s2 2s2 2p6
16 of 26
Why does magnesium have a high boiling point?
giant structure
17 of 26
What is the meaning of the term relative atomic mass?
the weighted mean mass of an element relative to 1/12th the mass of C-12
18 of 26
What is a lone pair of electrons?
A pair of outer electrons that aren't involved in bonding
19 of 26
What are bonds which are extremely electronegative or electropositive called?
Ionic
20 of 26
Chlorine in cyclohexane is pale green?
True
21 of 26
What is the shape and bond angle of a hydroxonium ion?
pyramidal 107 degrees
22 of 26
Is CCl4 polar or non-polar
Non-polar
23 of 26
When drawing a hydrogen bond what must the bond from the hydrogen hit?
lone pair
24 of 26
What happens to reactivity down Group 2?
increase
25 of 26
What is the oxidation number of oxygen bonded to fluorine?
+2
26 of 26

Other cards in this set

Card 2

Front

What is the definition of empirical formula?

Back

The simplest whole number ration of atoms of each element present in a compound

Card 3

Front

At RTP what is the molar volume of any gas?

Back

Preview of the front of card 3

Card 4

Front

A compound has an empirical formula of SCl and a relative molecular mass of 135.2, find the molecular formula.

Back

Preview of the front of card 4

Card 5

Front

What is the unit that concentration is measured in?

Back

Preview of the front of card 5
View more cards

Comments

suzi

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can you put the right answer plz.cause i wanna know wat i got wrong .

Sane Insanity

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i have. just click the Show The Answers button after you have seen your results. If is in the place of te Submit button that was there before you submitted your answers

JANDU

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Half your answers are wrong. O has a higher ionisation energy than N because ionisation increases across a period!

Sane Insanity

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JANDU Question 21 is correct. Ionisation does increase across a period but in some cases such as from Nitrogen to Oxygen. The first ionisation energy of Oxygen is less than that of Nitrogen as Nitrogen has a half filled subshell (Nitrogen's electron configuration being 1s2 2s2 2p3) . In oxygen the electron configuration is 1s2 2s2 2p4. However half filled subshells have more energy than subshells which contain more electrons (excluding full shells). Therefore nitrogen is more stable than oxygen as the p subshell which can hold up to 6 electrons contains half that number, so this increased stability makes it harder to remove an from nitrogen than it does to remove one from oxygen. 

Sane Insanity

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Modified the ones that had typos or mistakes

ELectrica!

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Q28:"Is CCl4 polar or non-polar"

this is quite a misleading question as you are not specific in what you are asking (about the bond or the whole molecule itself)

ccl4 is a  polar molecule with polar bonds. 

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