History of Atoms and Chemical Reactions

Who were the first people to give the idea of an atom?

• Democritus and Acharya Kannad

• John Dalton

• JJ Thomson

• Rutherford

What did John Dalton create?

• Dalton's atomic theory

• Cathode ray tube

• Gold foil experiment

• Nuclear reaction

What did JJ Thomson prove about the atom?

• It has a negative charge

• It is electrically neutral

• It has a positive charge

• It is indivisible

What are the three types of rays released during radioactivity?

• Alpha particles

• Beta particles

• Gamma particles

• Neutrons

What did Rutherford conclude from his gold foil experiment?

• There is a lot of space in the atom

• The nucleus is negatively charged

• Atoms are indivisible

• Alpha particles are similar to double helium

What is the maximum number of electrons in the outermost shell?

• 2

• 4

• 8

• 10

What is a chemical reaction?

• Process of reactants forming products

• Change where a new substance is formed

• Change in temperature

• Change in odour

What is the equation for rusting?

• Iron + Oxygen → water + rust

• Iron + Water → rust

• Iron + Acid → salt + hydrogen

• Iron + Oxygen → iron oxide

What is the process of galvanization?

• Coating of zinc on iron

• Coating with oil paints

• Making rust resistant alloys

• All of the above

What happens during an exothermic reaction?

• Heat is released

• Heat is absorbed

• Temperature decreases

• Reactants need energy