Quiz Chemistry 8th Grade

Which is a substance that cannot be further divided into simpler substances by chemical methods?

• Element

• Compound

• Dice

• Proton

Which is a substance formed by the chemical combination of two or more elements in fixed positions?

• Element

• Compound

• Nucleus

• Atom

Which are the structures of atom?

• Proton, Neutron, and Electron

• Neutron and Electron

• Proton and Electron

• Proton and Neutron

Which is an uncharged subatomic particle present in the nucleus of atoms?

• Proton

• Neutron

• Electron

• Substance

The Instruction:

Fill the blank part on the table! (Write down in your paper, you dont need to make the table)

Which are the amount of a proton, neutron and electron, given that a atom has an atomic mass of 1?

• Proton: 1
  Neutron: 0

  Electron: 1

• Proton: 1
  Neutron: 1

  Electron: 1

• Proton: 1
  Neutron: 1

  Electron: 0

• Proton: 0
  Neutron: 1

  Electron: 1

Why the atomic mass (Mass number) is only the total number of protons and neutrons in the nucleus? Why do the electrons not become a part of atomic mass? (The subatomic particle should be 3 parts)

Which are the total of a proton, neutron and electron, given that a sodium atom has an atomic mass of 23 and an atomic number of 11?

• Proton: 11
  Neutron: 12

  Electron: 11

• Proton: 11
  Neutron: 23

  Electron: 11

• Proton: 11
  Neutron: 12

  Electron: 23

• Proton: 11
  Neutron: 11

  Electron: 12

Which are the atoms of the same element that have the same proton number but a different nucleon number?

• Isotope

• Atom

• Element

• Compound

An atom of Carbon has 6 protons, 6 electrons, and 6 neutrons. How many nucleons does it contain?

• 12

• 13

• 14

• 18