Quiz Study guide
Lab Safety
goggles must be Over Your Eyes until Mr. Leeds says to put them away
"even if you are already finished
Report all accidents/spills to Mr. Leeds immediately
Try your best to use common sense
Nurse :ext:2828
Safety Equipment:
Fire extinguisher
Fire blanket
Eye wash
Chemicals:
Never taste chemicals
Never waft solids; powders
Always waft liquids
Avoid touching chemicals
always wash hands with soap and water after lab
If chemicals touch skin : flush skin with water for 1 minute and notify Mr. Leeds
Glass:
Hot glass 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
Alchol Burners:
Roll up sleeves, put up long hair
Never walk away from lit burner
Never point the end of a hot test tube at yourself or someone else
Do not look down into a test tube/beaker while it is being heated
Make sure burner is capped and flame is out when done
End of Experiment:
Clean up Area
Make sure burner is out
Keep goggles on eyes until Mr. Leeds tells you to put them away
Reaction in a Bag
use as a ph indicator
below 7 turns yellow
above 8 turns pink
Ph Scale:
Measures acidity
goes from 0-14
0-7-14
0 Acid 7 Neutral 14 alkaline
Lemon juice 1.5
Tums 10
Solids:
A= Calcium chloride (calcium and chlorine) Acidic
hydrotrop "it absorbs water"
uses: canned veggies electrolyte in sport drinks flavors pickles
Solid B:
Sodium bicarbonate/ baking soda
-non acidic
uses: baking, tooth paste, laundry detergent
Heating Baking Soda
Gas comes from the baking soda
The heated baking soda is not baking soda any more because it was a different color when we poured the tea in
Control groups: unheated b.soda/tea
Experimental group: heated b.soda/tea
Indicator: tea
Variable: a category you try to measure
Independent var: Causes a change in the dependent- temperature change
Dependent var: Tea color
Control factors:
Same type of tea
Same amt. of b.soda
same amt. of tea
Same size t.tube
Same stirring time
Volume Notes
Volume= length times with times height
Standard Unit of length = meter cm
1 centimeter= 0.1 m
100cm= 1m
Unit cube
- a small cube 1 cm on each edge
Volume of liquids
- Use a graduated culinder to measure volume
Always check the intervals or scale
units= milliters (mL) or cm3
1ml= cm3
Single Pan balance Notes
Always zero balance
Push all riders to the left
use adjustment knob
Never switch Pan
Pick up balance by red ball only
do not zero balance when done
bq's
Answers:
3. 50 cm3
4. There is more liquid in box a
5. 7cm3
6. A 84
B 27
5 ml
8. Because the circumfrance gets bigger
9-13 measure them to get answer
Test one calculaitons
1. If the height of the space was 0.47 of the length of an edge of a unit cube, what was the volume of the box?
6x5x7.5=224.1 cm cubed
2. If the height of the space was 0.47 of the length of an edge of a unit cube, what was the volume of the box?
6x5x7.47= 224.1 cm cubed
3. What is the mass of an iron bar that is 2cmx 4cmx 11 cm? (1cm cubed of iron has a mass of 7.8 g
686.4g
Look at chart for sand lab
Kilograms
to find pound to kg divide pounds by 2.2
Know how to find density
ending subtract initial then divide by number of yes's
Know if someone made a mistake by not being in the sensitivity of the balance
Know how to measure a line and read a gratuated cylinder
Look at experimental errors for labs that we did in chapter 1
Test 2
- an error is that if the cap is not tightened all the way then gas can escape from the container
Know experimental for Mass for Mass of Copper and Sulfur Lab
- If rubber sheet has a hole in it gas can escape through that whole
Know Experimental error of Ice and Water lab
- If condensation forms on the outside of the bottle and you do not wipe it off you will add mass to the Mf
Multiple choice
During the ice and water lab a lab group forgot to put the cap on their bottle. By the time they realized their mistake some condensation had already formed on the outside and inside of the bottle. They should
Start lab over
Know law of conservation of mass (something in a bottle cant change mass)
Know how condensation affects lab
Know salt does not evaporate
Know how to find change in mass and how to subtract to get the mi and mf
Percent change in Mass is Change in Mass over Mf
Know how to construct histogram
Test 3
Know how to use scientific notation
know how to calculate the mass of a type of gas when given the rooms dimensions and the gas's density
kg= 1000g
m= 100 cm
Look over experimental errors for labs in chapter 3
Epson Salt scientific name is Magnesium Sulfate
Construct graphs of an items density and graph number of wheels in a store and per wheels in a store