Topic 5 - Amounts, Formulae and Equations

Question 1

What colour is methyl orange in acids?

Answer 1

Red

Question 2

What colour is methyl orange in alkalines?

Answer 2

Yellow

Question 3

What colour is phenolphthalein in acids?

Answer 3

Colourless

Question 4

What colour is phenolphthalein in alkalines?

Answer 4

Pink

Question 5

What is the ideal gas equation?

Answer 5

pV=nRT

Question 6

Convert from °C to K

Answer 6

+273

Question 7

Convert kPa to Pa

Answer 7

x1000

Question 8

Convert cm3 to m3

Answer 8

x10-6

Question 9

Convert dm3 to m3

Answer 9

Divide by 1000

Question 10

What is the ideal gas constant?

Answer 10

8.31 Jmol-1K-1

Question 11

What measurements are needed.

Answer 11

Pressure -Pa
Volume -m3
Moles - mol
R - ideal gas constant - 8.31
Temperature - K

Question 12

What are dative covalent bonds?

Answer 12

Shared pair of electrons using two electrons from same atom.

Question 13

What is covalent bond?

Answer 13

Shared pair of electrons using one electron from each atom.

Question 14

What gas can fumes of HCl gas be identified by? What observations?

Answer 14

Ammonia
White solid/ white smoke

Question 15

Precipitate for bromide

Answer 15

Cream

Question 16

Precipitate for chloride

Answer 16

White

Question 17

What does AgBr do in NH3

Answer 17

Remains in dilute dissolves in concentrated

Question 18

What does AgCl do in NH3

Answer 18

Dissolves in both dilute + concentrated

Question 19

Equations for atom economy

Answer 19

Molar mass desired product/ total mass products x100

Question 20

What solid can be used to absorb water formed in combustion.

Answer 20

CaCl2