Key concepts in Chemistry

• Define an atom.

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

  a substance made of only one type of atom
• What is a compound molecule?

  two or more atoms of different elements bonded together
• What is a molecule?

  two or more atoms bonded together
• What is a mixture?

  particles that are together, but not bonded.
• What is a molecule of an element?

  two or more atoms of the same element bonded together
• What does the kinetic theory suggest everything is made from?

  tiny particles
• What do all particles do because of their thermal energy?

  move
• What happens to a gas when we try to squash it?

  it will compress
• What happens to a liquid when we try to squash it?

  It will not compress
• What happens to a solid when we try to squash it?

  It will not compress
• What is the spacing of particles like in a solid?

  the particles are close together
• What is the spacing of particles like in a liquid?

  the particles are close together
• What is the spacing of particles like in a gas?

  the particles are far apart
• How do particles in a solid move?

  the particles vibrate about a fixed position
• How do particles in a liquid move?

  the particles vibrate and slide past each other
• How do particles in a gas move?

  the particles are free to move anywhere
• What is the shape of a solid like?

  solids have a fixed shape
• What is the shape of a liquid like?

  liquids flow to take the shape of their container
• What is the shape of gases like?

  gases flow to completely fill their container
• What are the bonds like in a solid?

  strong
• What are the bonds like in a liquid?

  weak
• What are the bonds like in a gas?

  there are none
• What is 270 in standard form?

  2.7 × 10²
• What is 790 in standard form?

  7.9 × 10²
• What is 6200 in standard form?

  6.2 × 10³
• What is 6200 in standard form?

  6.2 × 10³
• What is 20000 in standard form?

  2.0 × 10⁴
• What is 0.7 in standard form?

  7.0 × 10⁻¹
• What is 0.34 in standard form?

  3.4 × 10⁻¹
• What is 0.038 in standard form?

  3.8 × 10⁻²
• What is 0.068 in standard form?

  6.8 × 10⁻²
• What is 0.0052 in standard form?

  5.2 × 10⁻³
• What is 1.1 × 10² in normal numbers?

  110
• What is 6.1 × 10² in normal numbers?

  610
• What is 1.5 × 10³ in normal numbers?

  1500
• What is 6.6 × 10³ in normal numbers?

  6600
• What is 3.8 × 10⁴ in normal numbers?

  38000
• What is 7.7 × 10⁻¹ in normal numbers?

  0.770
• What is 9.6 × 10⁻¹ in normal numbers?

  0.960