Science wa1

• What are the 7 physical properties

  -melting and boiling points

  -thermal conducitivity

  -electrical conductivity

  -density

  -strength

  -hardness

  -flexibility
• What is the formula of density

  mass/volume
• Density of object more than the density of liquid will sink
• Density of object less than the density of liquid will float
• what r the classification of materials

  • metal
  • fabric
  • glass
  • ceramic
  • plastic
• Mass unit is : g, kg
• instrument to measure mass is electronic balance
• Volume units is : cm3, m3
• Volume instruments to measure it is ruler and digital calipers
• What are the 5 important things for particulate nature of matter

  arrangement

  movement

  forces of attraction

  structure

  diffusion
• What is the arrangement of solid

  very closely packed

  orderly manner
• Liquid arrangement

  closely packed

  disorderly
• gas arrangement

  far apart

  disorderly
• solid movement

  vibrate in their fixed position
• Liquid movement

  Slide past one another

  random direction
• Gas movement

  move quickly

  random movement
• Solid force of attraction

  Very strong
• Liquid force of attraction

  strong
• gas force of attraction

  Weak
• This structure is solid

  
• This structure is liquid

  
• This structure is gas

  
• Diffusion is the net movement of substances from a region of higher concentration to a region of lower concentration
• What is a protons relative mass

  1
• what is a neutrons relative mass

  1
• What is a electrons relative mass

  1/1840
• protons relative charge is +1
• Neutrons relative charge is 0
• Electrons relative charge is -1
• Protons can be found in the nucleus
• Neutrons can be found in the nucleus
• Electrons can be found around the nucleus
• Proton + neutron is a nucleus mass number
• 39 represents the nucleus number and 19 represents the proton number

  
• Isotopes are atoms with different numbers of neutrons but same atomic number
• Proton and electrons are the same number
• nucleus number - proton number = neutron
• What forces are there

  • contact force
  • non contact force
• Non contact force is when two object don't touch each other
• Contact force is when two (or more) objects touch each other