Chemistry Unit 3a Revision

These are some question that i made to help me revise for the exam on monday. this is just the first section two the chemistry unit 3. But i hope it helps you too. good luck in your exams.

If there are any mistakes please tell me. thanks

?
  • Created by: Iswariya
  • Created on: 17-05-13 19:24
Why did Mendeleev leave gaps in the periodic table that he created first of all?
For undiscovered elements.
1 of 21
Where-about's are the transition metals situated in the Modern Periodic table?
in the middle
2 of 21
What is the link between the number of electrons in the outer shell of an element and the group it is in, apart from the last group?
Same numbers
3 of 21
How does the reactivity of the Alkali metal change as you go down their group?
more reactive
4 of 21
How does the melting/Boiling points change of the alkali metals change as you go down the group?
Decreases
5 of 21
What is the catalyst used in the reaction to make ammonia?
iron
6 of 21
Do transition metals have high densities?
yes
7 of 21
What colour is fluorine at room temperature?
pale yellow, yellow
8 of 21
How does reactivity change as you go down the Halogens group?
decreases
9 of 21
Which two ions does hard water contain?
calcium and magnesium
10 of 21
What is the chemical name of Scum?
calcium stearate or magnesium stearate
11 of 21
Give two reasons why hard water is better than soft water.
provides calcium needed for bones and teeth; can be found to reduce heart illness.
12 of 21
Give a reason why limescale is a problem.
Damages heating elements- poor effeciency; clogs up pipes.
13 of 21
What ion is found in an ion exchange column?
Sodium
14 of 21
Give a reason why pure water is good for you?
reduces the risk of heart problems; reduces the risk of some intestinal cancers; reduces the risk of lead poisoning; increases overall lifespan.
15 of 21
What method id used to purify water?
Distillation
16 of 21
What is Calorimetry used for?
It is a methiod to measure the energy released by chemical reactions.
17 of 21
To break bonds what type of reaction is it?
endothermic
18 of 21
How can the activation energy needed be decreased in a reaction?
using a catalyst
19 of 21
Does burning Hydrogen add to the greenhouse effect?
no
20 of 21
How does fuel cells produce electricity?
reaction of hydrogen and oxygen
21 of 21

Other cards in this set

Card 2

Front

Where-about's are the transition metals situated in the Modern Periodic table?

Back

in the middle

Card 3

Front

What is the link between the number of electrons in the outer shell of an element and the group it is in, apart from the last group?

Back

Preview of the front of card 3

Card 4

Front

How does the reactivity of the Alkali metal change as you go down their group?

Back

Preview of the front of card 4

Card 5

Front

How does the melting/Boiling points change of the alkali metals change as you go down the group?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all The Periodic Table resources »