IPS Exam Experience

Chapters 1-3

Lab Safety

  • Nurse extension: 2828
  • Roll up sleeves and put up hair with burner
  • Goggles kept on your face during the lab
  • Never use force to remove or insert glass
  • Exothermic= heat is given off

Chapter 1

Scientific Method

  1. Identify problem
  2. Gather info
  3. Form hypothesis/theory
  4. Test the theory- experiment
  5. Analyze data
  6. Conclusion

Reaction in a Bag Lab

  • Turns yellow and bubbly when substances are mixed
  • Hot then cold
  • Became thick
  • Bag expands (fills with a gas)
  • Substance A, B, and some sort of liquid is needed for this reaction to occur

Baking Soda Lab

  • Baking soda: sodium bicarbonate
  • Releases gas when heated
  • Tea indicator
  • Heated baking soda had changed, no longer is soda
  • Hole in the tubing
  • Rubber band snaps off on accident
  • Cap the burner too early
  • Stopper is not on tight

Volume Notes

  • Standard unit of length= meter (m)
  • 100 cm= 1 m
  • Unit of measurement= cm3
  • Volume= l x w x h

Single Pan Balance Notes

  1. Check that pan is clean and dry
  2. Always "zero" balance before massing
  3. Never switch pans
  4. Pick up balance by red bar only

Measure Volume by Displacement of Water Lab

  • Volume of Sand Alone= Sand and Water - Water
  • Volume of Air= Volume of Dry Sand and Air - Sand Alone
  • Amount of air space in sand is usually around 40%
  • Sand sticks to the side of graduated cylinder (effect- volume of sand and water is incorrect)
  • Read sand level not the water level (volume of sand and water) (calculations are all wrong)
  • Water splashes out when sand is poured (less water at the end)
  • Pour sand too fast (overflows funnel)

The Sensitivity of a Balance Lab

  • Sensitivity= 0.02g
  • Triangle= Delta= change
  • Triangle M= change in mass
  • Triangle V= change in volume

Chapter 2

The Mass of Dissolved Salt Lab

  • All the errors lead to a loss in mass
  • Cleaning the pan between the Mi and the Mf leads to a loss in mass
  • The cap is not tight (water spills out) leads to a loss in mass
  • Spill salt from cap to bottle leads in a loss of mass
  • Outside of bottle is wet leads to a loss in mass

The Mass of Ice and Water Lab

  • Condensation- when warm water vapor touches the cool bottle it changes from a gas to a liquid
  • Not wiping off condensation on the outside
  • If you shake the bottle
  • Cap not on tight- water evaporates and leaves
  • Ice is not fully melted

The Mass of Copper and Sulfur Lab

  • Shaking the test tube- sulfur could stick to the side of the test tube
  • Rubber sheet could have a hole
  • Capping burner before reaction ends
  • Rubber sheet is not on tight enough on top of tube

The Mass of a Gas Lab

  • Outside of bottle is wet during Mi
  • Inside of cap is wet
  • When loosening cap, some water could splash out
  • Loosen cap not fully
  • Cap not on tightly

Chapter 3

The Mass and Volume Lab

  • Cylinder is not fully submerged in water
  • Water could splash out of the graduated cylinder
  • Aluminum cylinder is wet
  • Re-mass the same cylinder


  • M/V=D
  • Unit of Density= g/cm3
  • Aluminum= 2.7 g/cm3
  • Lead= 11.3 g/cm3
  • Brass= 8.5 g/cm3

The Density of Solids Lab

  • Find the volume of rock before its mass (mass will be greater)= density will be bigger
  • Mix up cubes
  • Measure from edge of ruler= volume will decrease= density will increase

The Rock

All have different densities because the rock is formed by many substances being compressed together. Different substances= different densities

The Densities of Liquids Lab

  • Cylinders could be contaminated
  • Cylinder is wet when massed
  • Dry out cylinder after its massed
  • Some liquid sticks to inside wall of cylinder (volume decreases= density increases)
  • Magnesium sulfate= epsom salt

The Density of a Gas Lab

  • Hand does not seal the bottle when removing it
  • Foil not there for Mf
  • Takes too long to insert tubing
  • Taking the stopper off before removing the rubber tubing
  • Touching the Alka-Seltzer in the middle of the putting it in the test tube (removing some of the mass)