IPS Exam Experience
Day One: calculations Day Two: mc,true/false,matching(vocab)
- Nurse number is 2828
- Safety equipment is fire extinguisher, fire blanket, eye wash/shower
- When working with chemicals never taste chemicals, always waft liquids, never waft solids/powders. Avoid touching chemicals, always wash hands
- Glass: hot and cold can look the same,never use chipped/broken glass/insert glass.
- Alcohol burners; Roll up your sleeves and put back your hair,never walk away from lit burner, don't look down into test tube while beaker is heated,
- Diluting Acid; Acid must be added to water, never add water to acid-could cause exothermic reaction, water is less dense then acid so it will sit on top of acid and could splash out.
- ALWAYS CLEAN UP.
- Identify the problem
- Gather info
- hypothesis/theory is formed
- test theory
- analyze data
- draw conclusions
Reaction In a Bag
reaction made gas, B is makes cold, A is exothermic.
Scholar Reaction In The Bag Inquiry Demonstration and Lab Activity
- control group
- Experimental group
- control factors
- volume displacement tenique
1.1 Lab Baking Soda
- B. soda: sodium bicarbonate
- releases gas when being heated
- tea was indicator-diff substances
- water vapor in air causes droplets of test tube
- Control group-unheated b soda w/ tea
- experimental groups-heated b soda w/ tea
- control factor- amt of tea, amt of b soda, same type of tea, stirring time
- experimental errors; Hole in tubing, stopper wasn't tight, rubber band snapped
Lab 1.1 Heating Baking Soda
1.2 volume notes
- cm3 is the unit of measurement
- volume; l x w x h
- standard unit of length is (meters)
- 1 centimeter is .01 meter or 100 cm= 1 m
- a unit cube is 1 cm each side
- use graduated cylinder to measure volume, check intervals 1 ml=1cm3
- 2.2 kg = 1 lbs
1.3 Reading Scales, Single Pan Balance
- Check pan is clean and dry
- always zero balance before massing
- never switch pans
- pick up balance by red bar
1.4 Water Displacement
- DATA TABLE
- Errors; Sand sticks to side of graduated cylinder-effect would be volume of sand would go down.
- Errors; read sand not water level- effect throw numbers off
- Errors; water splashes out when sand is poured- effect calculations off
- Errors; pour sand too fast over flows in funnel- calculations would be off
- Does not matter that each group had diff. amt of sand b/c how much sand you begin with does not effect the percent of air space with the sand( about 40%)
- to find volume of sugar b/c dissolves in water use mercury or oils, gas, or alchohol.
- Measure volume of a cork putting weight on cork makes both sink subtract both then just weight
Lab 1-4 Measuring Volume By Displacement
1.8 Sensitivity of Balance
- Sensitivity of a balance means the margin of errors plus or minus that your balance gives when you mass an object
- if you keep massing the same objects your massing should be in .02 range within each other, or data is off.
- pennies were made of diff substances to make cheaper;copper was less more zinc
- pencil mark on paper
- cutting was not in a straight line
Lab 1-8 TBB.m4v
All experiments lead to not change in mass
- Conservation of mass
- laws of nature
2.1 Mass of Dissolved Salt
- All of the errors leads to a loss in mass
- Errors; cleaning the pan between the Mi and Mf
- Errors; the cap was not on tight, H2O leaves
- Errors;Pouring salt into the bottle and some salt spills
- Errors; outside the bottle is wet
- Evaporating the water would leave just the salt behind
- If change is smaller than .01 you wouldn't observe it.
- don't need to know individual masses of the samples because we are only interested in change in mass and the amt of water and salt is independent to change in mass
Lab 2-1 Mass of Dissolved Salt
- take out smallest and largest
- when negative to the left only right when exact number falls on line
2.4 Mass of Ice and Water
- Condensation when the water vapor touches the cool bottle it changes it's state of matter
- all around we have water vapor; warm touching cold
- plastic surface was cold b/c of ice melting in it
- Errors;Cap wasn't on tight, water vapor escaped; decrease
- Errors; forgetting to wipe condensation off the outside when massed. leave condensation on inside, lead to gain
- Ice isn't fully melted.
- shaking bottle, decrease if water splashed out.
2.5 Mass of Copper and Sulfur
- Errors; shaking test tube
- Errors; rubber sheet has a whole(loss)
- Errors; cap burner before reaction ends
- Errors; rubber sheet is not snug on top of test tube(loss)
- rubber sheet is used b/c it can stretch instead of stopper where gas builds up inside and experiment can explode.
2-5 Sulfer and Copper
2.6 Mass of a Gas
- Errors; outside of the bottle is wet
- Errors; inside of the cap in wet
- Errors; loosen the cap some water splashes out
- Errors; loosen cap not fully
- Errors; cap is not tight to begin with
Lab 2-6 Mass of Gas
2.7 Conservation of Mass
Should have no change
- Law of conservation of mass: in a closed system mass will remain constant regardless of the actions of the pressure inside closed system(nothing in or out)
- Exception: Mass is always conserved however, in a nuclear reaction some mass is lost the energy released in a nuclear reaction will be absorbed into surrounding material addin mass to it so the mass is not really "lost"
- property of an object: describes object itself
- property of a substance: identifies what the object is
- characteristic properties
- Phase diagram
- barometer pressure
3.2 Mass and Volume
- All aluminium should have a mass around 2.7g
- Brass should have mass around 8.7g
- Errors: Cylinder wasn't fully submerged under water
- Errors: water could splash out of graduated cylinder
- Errors: if aluminium cylinder is wet, adding mass
- Errors: mass the same cylinder twice
- objects that are made of the same substance and have the same volume will have the same mass.
Lab 3-2 Mass and Volume
Mass and volume Notes
- objects that are made of the same substance that have the same volume will have the same mass regardless of their shape.
- The mass of an object will double if it's volume doubles.
- Objects that have the same volume but are different substances will NOT have the same mass.
- unit is g/cm3
- know function graphs!!!
- label everything
3.5 Density of Solids
- cube 1 and the slab may be the same substance b/c their densities are similar.
- size doesn't matter density will be the same, single rock broken up, diff substances being squeezed together( why everyone's rock was diff mass).
- Errors: find volume of rock first- air holes would be filled up with water, mass greater, density greater
- Errors: mix up cubes
- Errors: measure from edge of ruler not zero, volume would decrease density greater.
Lab 3-5 Density of Solids
3.6 Density of a Liquid
- Errors: cylinder is contaminated
- Errors: cylinder is wet when massed
- Errors: dry out cylinder after it is massed
- Errors: some liquids stick to inside of wall of cylinder,- volume decrease, density increase
- liquids had something dissolved into them
- Magnesium sulfate or known as Epsom salt
3.7 Density of a Gas
- If volume is negative doesn't matter change to positive- change will be negative, "pf gas" positive.
- Errors: remove stopper before tubing- volume up, density down
- Errors: hand doesn't seal bottle when removing it- volume up, density down
- Errors: foil not placed back in the pan for Mf, mass up, density up
- takes too long to insert tubing into bottle-volume up, density down
- DENSITY OF A GAS IS 1.8 g/cm3- carbon dioxide
- measurements w/ scientific notation
- 1kg= 1,000 grams
- 1m=100 centimeters