Lab Safety-Measurement Lab

Study Guide

Lab Safety

For every lab:

  • goggles must be kept over your eyes at all times
  • report ALL accidents to Mr. Leeds
  • Common sense

Nurse extension:


Safety Equipment:

  • fire extinguisher
  • fire blanket
  • eye wash/ shower


  • never taste
  • waft liquids (never solids or powders)
  • avoid touching
  • wash hands with soap and water
  • if chemicals touch skin- flush skin with water for 1 min AND notify Mr. Leeds


  • hot glass looks like cold glass
  • never use chipped or broken glass
  • never use force to remove or insert glass

Alcohol Burners:

  • roll up sleeves, put UP long hair
  • never walk away from lit burner
  • never point open end of hot test tube at yourself or someone else
  • do not look down into test tube/beaker while being heated
  • cap flame when done

End of Experiment:

  • clean-up area
  • make sure burner is out
  • keep goggles over eyes until Mr. Leeds says to put them away

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Reaction In a Bag

What was the red liquid?

Phenol Red

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ph scale

  • measures acidity
  • goes from 0-14
  • 0 is acidic
  • 7 is neutral
  • 14 is alkaline
  • below 7 turns yellow
  • above 8 turns pink

What was Solid A?

Calcium Chloride

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Was solid a acidic, neutral, or alkaline?



absorbes/ attracted to water

Calcium Chloride uses?

  • canned veggies (keeps from getting mushy)
  • electrolyte in sports drinks
  • flavor pickles (salty flavor)

What was Solid B?

sodium bicarbonate

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Was solid b acidic, neutral, or alkaline?


Sodium bicarbonate uses?

  • baking
  • toothpaste
  • laundry detergent

Another name for sodium bicarbonate?

baking soda

What is a ph indicator?

Phenol Red

Produced Gas?

AB and water or red

Produced heat?

A mixing with red or water (exothermic reaction)

Experimental errors?

  • if there was a hole in the bag we would not see the gas being produced by the reaction

Scholar Reaction In The Bag Inquiry Demonstration and Lab Activity

Heating Baking Soda

What do you observe at the bottom of the test tube?

test tube was getting scorched on the outside

What do you observe near the top of the test tube?

condensation (moisture), bubbles forming, foggy, misty

What do you observe in the inverted bottle?

air is coming in and water is coming out

Where do you think the gas came from?

gas came from Baking Soda; gas left test tube

Where did the droplets on the test tube come from?

Baking Soda

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Describe the color of the liquid in each test tube.

Heated- murky, cloudy, darker

Unheated- clear, see through, light

ARe the two white powders the same substance?

no because the unheated is only baking soda and tea so the heated should be the same color, but they are different

In the heated test tube, did the baking soda dissolve into the tea?


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In the unheated test tube, did the baking soda dissolve into the tea?


What was the control group?

unheated baking soda and tea

What was the experimental group?

heated baking soda and tea


a category you try to measure

Independent variable

causes a change in the dependent variable

example of independent variable

temperature, heat

example of dependent variable

tea color

control factors

  • using same tea for both test tubes
  • same amount of baking soda and tea
  • same size test tubes
  • same amount of stirring time

experimental errors

  • hole in tubing -> won't see gas fill bottle
  • stopper not snug -> won't see gas fill bottle
  • not cleaning stirring rod -> contamination

Is the amount of condensation that forms at the top of the heated test tubes more or less than the amount of baking soda being heated?

less because the condensation comes from the baking soda and it cannot produce more than itself

Why does baking soda rise?

when heated it releases a gas

Lab 1.1 Heating Baking Soda


cubic centimeters



cubic centimeters

What unit of measurement is used for volume?

cm3 (cubic centimeters)

How do you measure volume?

L x W x H

What is the standard unit of length?


1 centimeter = ______________ meters


100 cm = ____________ m


What do you use to measure volume?

graduated cylinder

When measuring volume what do you always need to check?

intervals of scale

1 mL = ____________cm3


1 cm3 = _____________mL


How do you "zero" balance a scale?

  • push all riders to zero
  • use adjustment know if needed

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Single Pan Balance

When using a pan balance, what do you never switch?


Pick up balance by _________________ only

red bar

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Why should you report the positions of the arrows to the nearest 0.01 cm and not to the nearest 0.1 cm?

it will be more accurate

What advantage is there to making graduated cylinders narrow and tall rather than short and wide?

lines are further apart because there's more depth due to lack of surface, therefore it will be easier to read

By Kaitlyn Ockerman

Period 2