Junior Cycle Science Chemical World

What are the 4 main separation techniques used to separate mixtures?

• filtration, evaporation, distillation, separation

• evaporation, distillation, chromotography, boiling

• filtration, evaporation, distillation, chromotography

The atomic number of sodium is 11 and the mass number is 23. How many electrons does sodium have?

• 11

• 23

• 12

• 34

How many electrons will fill the first shell of a bohr diagram and how many electrons will fill each shell after this?

• 8, 8

• 2, 8

• 8, 2

• 10

What test is carried out to see if carbon dioxide gas has been produced?

• it will re-light a glowing splint

• smoke alarm will go off

• there will be a strong odour

• it will turn limewater milky

True/False: Carbon dioxide is used in fire extinguishers and fizzy drinks

• true

• false

Which state of matter has a definite shape, definite volume and cannot be easily compressed?

• solid

• liquid

• gas

• plasma

Do the products of an exothermic reaction have more or less energy than the reactants?

• more

• less

True/False: Acids have a pH between 8-14 on the pH scale

• true

• false

Name an indicator that could be used to determine the pH of a substance

• litmus paper

• iodine

• universal indicator

• methylene blue

What is it called when an acid and base react with one another?

• titration

• neutralisation

• pH scale

• Universal Indicator