Seneca Clean Up

Question 1

What are the key features of chemical reactions

Answer 1

. No atoms are created or destroyed
. There is a measurable energy change
. At least 1 new substance is created
. Compounds can be broken or formed

Question 2

Filtration

Answer 2

Filtration separates mixtures that contain insoluble solubles

Question 3

Chromatography

Answer 3

Chromatography separates solutions with a number of different solutes in the solvent

Question 4

Crystallisation

Answer 4

Crystallization separates solutions into their different parts : dissolved solids and liquids

Question 5

Solution

Answer 5

Liquid that contains a dissolved solid

Question 6

Solute

Answer 6

Dissolved solid

Question 7

Solvent

Answer 7

Liquid in which a solid dissolves

Question 8

Transition metals properties

Answer 8

. Used as catalysts
. Form different colored compounds
. Form ions with different positive charges

Question 9

Platinum and Rhodium

Answer 9

Platinum and Rhodium are used in catalytic converters in cars

Question 10

Iron

Answer 10

Iron is used in the Haber process to catalyse the production of ammonia

Question 11

What happens when an alkali metal reacts with water

Answer 11

. Enough energy is released to melt the metal
. The metal floats on the surface

Question 12

What is relative atomic mass

Answer 12

The relative atomic mass is the average mass of an element, weighted according to the abundance of its isotopes, on a scale where carbon-12 has a mass of 12