AQA Chem Combined C1 Topic 40Q

What is the smallest part of an element that can exist?

• Atom

• Compound

• Mixture

• Proton

How are atoms of different elements represented?

• By chemical symbols

• By numerical values

• By alphabetical order

• By physical properties

How many different elements are there?

• About 100

• About 50

• About 200

• About 500

Which process involves the formation of one or more new substances?

• Chemical reactions

• Physical changes

• Sublimation

• Evaporation

What are compounds made of?

• Two or more elements chemically combined

• Two or more elements physically combined

• Only one element

• Mixtures of elements and compounds

How can mixtures be separated?

• By physical processes

• By chemical reactions

• By nuclear processes

What led to the replacement of the plum-pudding model of the atom?

• Results from the alpha particle scattering experiment

• Discovery of electrons

• Discovery of neutrons

• Bohr's model

Who proposed the plum-pudding model of the atom?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• James Chadwick

According to the nuclear model, what orbits the nucleus?

• Electrons

• Protons

• Neutrons

• Alpha particles

What did James Chadwick's experimental work provide evidence for?

• Existence of protons

• Existence of electrons

• Existence of neutrons

• Existence of alpha particles