Semester Review #1

What scientist discovered orbits?

• Rutherford
• JJ Thompson
• Bohr

What scientist discovered Nucleus?

• Rutherford
• JJ Thompson
• Bohr

What scientist discovered electrons?

• Rutherford
• JJ Thompson
• Bohr

An example of a physical change is

• rusting of a nail
• burning of a log
• a peach spoils
• liquid N2 changes to a gas at -196° C

Which of the following is a chemical property of water?

• boiling point is 100oC
• colorless liquid
• produces a gas with sodium metal
• dissolves sugar

Which of the following is a chemical change?

• salt is dissolved in water.
• water is boiled on a stove.
• wood burns to ashes.
• copper metal stretches into a wire.

Which of the following describes the correct relationship between charges of particles in atoms?

• electrons(-), protons(+), neutrons(+)
• electrons(0), protons(-), neutrons(+)
• electrons(-), protons(+), neutrons(0)
• electrons(+), protons(0), neutrons(-)

Which subatomic particle identifies the atom?

• ions
• electrons
• neutrons
• protons

What particles form the nucleus of an atom?

• protons & neutrons
• protons & electrons
• protons only
• electrons only

All atoms of the same element have the same

• number of protons
• number of neutrons
• mass number
• atomic mass