Quiz Study guide

Lab Safety

For Every Lab:


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

Red Liquid:


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

Condensation comes from gas leaving t.tube

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

Units of measurements cm^3 (cubic centimeters)


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

Check the Pan is clean and dry


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

ook at lab text book for questions

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

In a rectangular bad been stacked in the box the following measurements were found: six cubes fit exactly along one edge, and five cubes fit exactly along another edge. However, after seven horizontal layers had been stacked in the box a space at the top was left unfilled



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

Know experimental errors for Mass of a gas


- 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 calculate density volume and mass with the formula m/v= d


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