Exp 1&2 Flashcards by Maryam Anuar

PERSONAL PROTECTIVE EQUIPMENT(PPE)

Lab coats
 Shoes (no sandals)
 Safety Goggles
 Gloves

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is essential in any laboratory
activity.

Protection of the eyes

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are a common sight in laboratories on campus. They
protect your skin and personal clothing and are a removable barrier
in the event of a spill or splash.

Lab coats

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are shoes that completely cover the feet and
are well secured on to the foot

Closed‐toe shoes

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‐ When handling chemical, physical, and/or biological
hazards that can enter the body through the skin, it is important to
wear the ________

Gloves

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Tie ______ and loose clothing to keep
them away from fire.

back long hair/hijab

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If you need to smell the odor of a chemical,

Waft the fumes
toward your nose with one hand. Do not put your nose over the
container and inhale the fumes

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Do not pipet solutions by mouth. Use a_________ or
special pipette filler.

rubber suction bulb

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Always hold the test tube with a ____ and point the top ends of test tubes that are being heated away from yourself and other people.

holder

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Clean up broken glass immediately with a _____
Do not use your hands

broom and a dustpan.

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Broken glassware should not be
disposed of in a classroom trashcan.
There is a _______
for it.

special glass disposal container

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When using glassware, make sure the container you are
using is resting on a table at least a _______ from the
edge.

hands breadth

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Take ______ than the experiment requires

Take no more of a chemical than the experiment requires

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Never return an ______ to a stock bottle

unused chemical

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Never _____ of chemical bottles

switch lid

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Do not insert a _____ into a stock bottle.

pipet

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Do not bring ______ to your laboratory bench.

stock chemicals

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Read the _______ on a bottle carefully.

label

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Do not pour any chemical into the _____

sink

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Notify your teacher if any _____ occur.

spills or accidents

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The ________ protect laboratory workers from fumes and potentially
dangerous chemicals reactions by continuously vacuuming air out of the
lab and providing a glass shield.

fume hoods

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. What should be worn in a laboratory to decrease the likelihood of eye injury?

Safety Glasses

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Describe the procedure for smelling a chemical.

Point vessel away from the face while gently fanning vapors towards nose

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What should be done if a chemical gets in the eyes?

Notify the instructor, then use the eye wash fountain

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Used for mixing, heating, stirring & pouring liquids

Beaker

Often Used for containing & mixing solutions.

Erlenmeyer Flask

Used for preparing standard solution.

Volumetric flask

Principal use for titrations.

Burette

Used to measure approximate volume of liquids

Graduated cylinder

Used to hold, mix, or heat substances.

Test Tubes

Used to fill burette and with fluted filter paper used to filter impurities from solution.

Conical/Filter funnel

Used to collect final product of lab product synthesis.

Buchner funnel

Used with Buchner funnel for separating solids & liquids.

Buchner flask

Fixed volume

Transfer Pipet

Mohr Pipet

Variable volume

Used to measure & transfer small volume of liquid.

Micropipette

A ______ is a scale for weighing; to obtain mass of various objects.

balance

Locate the safety equipment. Find?

eye wash fountains, safety showers, fire extinguishers, fire blankets, first aid kit, and all exit

Wear shoes that cover all of your feet. _____ on the laboratory floor is all too common. Your feet will need more protection than that afforded by open-toed shoes or sandals.

Broken glass

Wear _____ at all times. Prescription eyeglasses, if you need them, must be worn under _____

goggles

Do not put flammable liquids near an?

open flame

Do not do or ____ unauthorized experiments.

watch

Handle glass tubing with care. When tubing (including glass thermometers) is to be inserted through a rubber stopper, the tubing must be lubricated with ______

water or glycerol

Do not pour any chemical into a sink without authorization. Often, ______ will be provided.

disposal bottles

Avoid contamination by pouring the liquid into one of your ________ before taking a sample.

test tubes, flasks, or beakers

measure an approximate volume of a liquid but is more accurate than beaker and Erlenmeyer flask

graduated cylinder

This concave surface is called a

meniscus

is calibrated to deliver one and only one volume,

transfer pipette

graduated so that it can deliver any volume (usually to the nearest tenth of a milliliter) up to its maximum volume.

mohr pipet

uses an internal plunger mechanism to draw in and dispense liquids.

micropipete

The clean, properly operating buret should be held in place by a?

buret clamp

is used for titrations and many other situations where we have to handle liquids. It is not suitable for measuring accurate volumes.

The “Erlenmeyer” or “conical flask

The Büchner funnel is used to collect the final product of a laboratory synthesis process. It is used together with an ______ that draws a vacuum thereby pulling the liquid through the filter paper while the pure solid product is collected on the filter.

aspirator

fill burets, larger funnels together with folded or fluted filter paper are used to filter impurities or product from solutions.

glass funnels

‐Gives an indication of chemical species in the sample

Qualitative data

‐ Presence of a substance

Qualitative data

Sugar in a cup of tea

Qualitative data

color change, smell, precipitation.

Qualitative data

mass, volume, area, length, height.

Quantitative data

How many grams of sugar in a cup of tea.

Quantitative data

‐ How much?

Quantitative data

‐Determines the amount of certain components present in the substance

Quantitative data

physical quantities that cannot be defined in terms of other quantities.

Base quantity

A quantity that can be obtained from other base quantity by multiplication or division.

Derived quantity

How close a measurement is to a true value.

Accuracy

How close set of measurements are to each other.

Precision

With increase in temperature, the density . ______

decreases

how do you convert μL to ml?

divide by 1000

how do you convert ml to μL?

multiply by 1000

%relative error formula

((expected value - measure value) / expected value) x 100

Any digit that is ___ is significant

not zero

Zeros between nonzero digits are

significant

Zeros to the left of first nonzero digit are

not significant

* If a number is greater than ____, then all zeros to the right of the decimal point are significant

are significant when there is a decimal place

trailing zeroes

may or may not be significant when there is no decimal place

trailing zeroes

are never significant

Leading zeroes

The answer cannot have more digits to the right of the decimal point than any of the original numbers.

Addition and Subtraction

The number of significant figures in the result is set by the original number that has the smallest number of significant figures.

Multiplication or Division

Numbers from definitions or numbers of objects are considered to have an infinite number of significant figures.

Exact Numbers

is defined as the amount of substance present in a unit volume

Density