Test 1 STUDY GUIDE

Safety tips for Alcohol Burners

  • roll up sleeves
  • put up long hair
  • never walk away from lit burner
  • never point the open end of a test tube at yourself or someone else
  • do not look down into test tube/beaker while it is being heated
  • make sure burner is capped and flame is out when done


Nurse Extension

2828


Safety Tips For Chemicals

  • Never taste chemicals
  • Always WAFT liquids to detect odor
  • NEVER WAFT SOLIDS/POWDERS
  • avoid touching chemicals
  • always wash hands with soap and water after lab
  • if chemicals touch skin: flush skin with water for 1 minute and tell Mr.Leeds


ALWAYS KEEP YOUR GOGGLES ON DURING LABS AND CLEANUP

Safety Equiptment in Classroom

  • fire extinguisher
  • fire blanket
  • eye wash/shower


Safety Tips for Glass

  • Hot and cold glass look the same
  • Never use chipped or broken glass
  • Tell Mr.Leeds and dispose of broken glass in proper trash
  • Never use force to remove or insert glass


VOLUME NOTES

  • unit of measure-cm³
  • volume formula-LxWxH
  • standard unit of length-meter
  • 1 centimeter-.01


VOLUME OF LIQUIDS

  • use graduated cylinder
***always check intervals/scale***
  • unit- millimeters (mL) or cm³
  • 1mL=1cm³


Balances

  1. check that pan is clean and dry
  2. always "zero" balance before each massing
  3. push riders to zero
  4. use adjustment knob if needed
  5. never switch pans
  6. pick up balance by red bar only
  7. don't zero balance when done


extra question baking soda lab

Is the amount of condensation that forms at the top of the heated test tube more or less than the amount of baking soda being heated? The amount of condensation is less than/or equal to the amount of baking soda, because if it was more there would be no more baking soda left in the test tube. (also it can't be more, because it cant produce more than itself)


box questions 1 and 3-13

1) Why do you think baking soda is used in baking?

it releases gas when heated, which allows dough to rise

2)How many cubic centimeters of water are required to fill a graduated cylinder to the 50.0-mL mark?

50cm3

3) Rectangular box A has a greater volume than rectangular box B but the length of box A is less that the length of box B. How is this possible?
A is wider than B (greater volume)

4) Adding a stone to a graduated cylinder containing 25.0cm3 of water raises the water level in the cylinder to the 32.0-cm3 mark. What is the volume of the stone?
7cm3

5) A student has a large number of cubes that measure 1 cm along an edge. (If you find it helpful, use a drawing or a set of cubes to

answer the following questions.)

a. How many cubes will be needed to build a cube that measures 2 cm along an edge?

8 cubes

b. How many cubes will be needed to build a cube that measures

3 cm along an edge?

27 cubes

c. Express, in cubic centimeters, the volumes of the cubes built in (a) and (b).

8cm3+27cm3

6) One rectangular box is 30 cm long, 15 cm wide, and 10 cm deep. A second rectangular box is 25 cm long, 16 cm wide, and 15 cm deep. Which box has the larger volume?

second box is larger


7) figure A shows a cone-shaped graduate used for measuring the volume of liquids. Why are the divisions not equally spaced?

because it is skinnier at the bottom, higher=more surface, surface increases- depth decreases


8) three students reported the length of a pencil to be 12cm. 12.0cm, and 12.00 cm. Do all three readings contain the same information?

12: 11.5-12.4

12.0: 11.95-12.10

12.00: 11.995-12.004


9) What is the advantage to making graduated cylinders narrow and tall rather than sort and wide?

lines are further apart b/c less surface area=more depth, makes it easier to read


POST LAB BAKING SODA

control factors

  • same type of tea
  • amount of baking soda
  • amount of tea
  • same stirring time
  • same size test tube


experimental errors

  • hole in tubing→bottle won't fill with gas
  • stopper not snug
  • don't clean stirring rod at the beginning→contamination


post lab reaction in a bag