Chemistry Test Review

Match the following

• Discovered Electron; plum pudding

• JJ Thompson

• Came up with 5 part atomic theory

• Democritus

• Discovered nucleus; gold foil

• Ernest Rutherford

• First person to think of atoms

• John Dalton

• Earth, Air, Wind, and Fire

• Aristotle

What is a physical change?

• A change that does not change the identity of the substance

• Something that changes the identity of the substance

• The appearance

• A reaction

What is a chemical change?

• A change that does not change the identity of the substance

• Something that changes the identity of the substance

• The appearance

• A reaction

Which of the following is a physical change? (select all that apply)

• Cutting a piece of paper

• Dissolving kool-aid into water

• burning wood

• A penny turning green because it has been exposed to oxygen

• Putting green dye into water

Which of the following are chemical changes? (select all that apply)

• Dissolving salt into water

• Burning a piece of toast

• Mixing baking soda and vinegar and it bubbles over the cup

• Baking cake

• Putting blue dye in a cup of water

Which of the following is a compound?

• H₂O

• Cl₂

• He

• NaCl

Match the following

• Discovered Neutron

• Niels Bohr

• Nucleus is in center and electrons orbit

• James Chadwick

• Electrons exist in orbitals

• Alchemists

• Combined magic, religion, and science

• Pauli and Heisenberg

What is an electron?

• Positively charged subatomic particle

• Negatively charged subatomic particle

• Subatomic particle with no charge

• Same number of protons

What is a proton?

• Positively charged subatomic particle

• Negatively charged subatomic particle

• Subatomic particle with no charge

• Different number of electrons

What is a neutron?

• Positively charged subatomic particle

• Negatively charged subatomic particle

• Subatomic particle with no charge

• Different number of electrons