Other things

Question 1

Module 1

What is the difference between a homogenous and a heterogenous structure

Answer 1

A homogenous mixture is that mixture in which the components mix with each other and its composition is uniform throughout the solution.

A heterogenous mixture is that mixture in which the composition is not uniform throughout and different components are observed.

Question 2

What is the meaning of nomelclature?

Answer 2

Chemical nomenclature is a set of rules to generate systematic names for chemical compounds.

Question 3

What are isotopes?

Answer 3

Atoms with the same number of protons but different numbers of neutrons are called isotopes.

Question 4

What is allotropy?

Answer 4

the existence of two or more different physical forms of a chemical element.

Question 5

What is the diffrence of intermolecular and intramolecular forces?

Answer 5

Intramolecular forces form within a molecule. They are stronger than intermolecular forces.

Intermolecular forces are the forces between molecules and are weaker.

Question 6

What are the differences of homogenous and heterogenous catalysts?

Answer 6

Homogeneous catalysts are those that occupy the same phase as the reaction mixture (typically liquid or gas),.

While heterogeneous catalysts occupy a different phase.

Question 7

What is entropy?

Answer 7

A measure of each energy confgurations probability.

Question 8

What is the diference between entropy and enthalpy?

Answer 8

Entropy is to measure the randomness of activity in a system, on the other hand, enthalpy is the measurement of the overall amount of energy in the system.

Question 9

Experiments

Finding Molar Mass

Answer 9

• Metal ion+ water and add a sulfate (A white percipitate will form)
• Filter it
• Heat and record mass
• mass over moles is molar mass

Question 10

Experiments

Determining the imperical formula

Answer 10

• Weigh flask and stopper
• Add zinc and iodine
• Add ethanol which dissolves iodine
• Weight decant
• Leave untill ethanol evaporates
• Heat and weigh untill no difference
• Calculate moles, divide by smallest moles, use as ratio

Question 11

Experiment

Products of Decomposition

Answer 11

• Weigh
• Heat and weigh A grams of A
• Cool and heat again- weigh untill no mass is lost

Question 12

Experiment

Create standard solution

Answer 12

• Wigh out alocated mass
• Transferr to volumetric flask
• Swirl with de-ionised water
• Add 250ml to miniscus
• Invert

Question 13

Seperation Techniques

Sieving

Answer 13

Sieve big from small particles

Question 14

Experiment

Titration to condensation

Answer 14

• Standard into buret
• Add 20ml of B to conacle- add 2-3 drops of methyl orange
• Titrate- fast then slow
• repeat at least 4 times for reliability

Question 15

Seperation Techniques

Filtration

Answer 15

residue: undissolved solid
Filtrate: liquid that passed

Question 16

Seperation Techniques

Sedimentation

Answer 16

Allow denser undissolved particles to settle and form a layer at the bottom

Question 17

Seperation Techniques

Seperating funnel

Answer 17

Used to seperate immiscble liquids after sedimentation

Question 18

Seperation Techniques

Boiling point

Answer 18

• Evaporation uses heat to boil off the liquid part of a solution (homogenous mixture)

Question 19

Seperation techniques

Distillation

Answer 19

Evaporation with the added step to capture and condence the boiled liquid substances in a second chamber.

Question 20

Shapes of molecules

Linear

Answer 20

Question 21

Shapes of molecules

Bent

Answer 21

Question 22

Shape of molecule

Trigonal Planar

Answer 22

Question 23

Shape of molecule

Tetro hederal

Answer 23

Question 24

Shapes of molecules

Trigonal pyramidal

Answer 24