Chemistry Unit 1 Test

Goggles

protects eyes from spills, gas fumes, broken glass, etc

Ring Stand

supports various equipment above lab bench so that we can read it easier and heat with a Bunsen burner

Ring

attaches to ring stand and supports various equipment like wire gauze, clay triangles, and beakers

Funnel

holds a piece of filter paper or may be used to pour without splatter

Wire Guaze

spreads the heat from the Bunsen burner

Beaker

used as a container for larger reactions and may be heated

Erlenmeyer Flask

used as a container for larger reactions and may be heated, narrow mouth contains splatter

Wash Bottle

dispenses distilled water to keep experiments from being contaminated

Utility Clamp

attaches to a ring stand and holds various lab equipment

Test Tube

allows us to heat a reaction on a small scale

Test Tube Rack

holds test tubes in upright position during a reaction

Test Tube Holder

allows us to move test tubes

Clay Triangle

supports a crucible while being heated

Crucible and Cover

allows us to heat small amounts of solid materials and high temperatures

Crucible Tongs

picks up and holds crucibles and evaporating dishes (NOT beakers)

Evaporating Dish

used to evaporate small amounts of liquid

Watch Glass

covers beakers or holds a small amount of liquid for evaporating

Bunsen Burner

very high heat source

Striker

used in place of matches to light Bunsen burner

Forceps

holds and picks up small objects and solid materials

Spatula/Scoopula

transfers solid chemicals from one place to another

Dropper

used to transfer small amounts of liquid

Glass Stir Rod

stirs materials and is used for carefully pouring liquids

Mortar & Pestle

grinds solid chemicals into a powder

Graduated Cylinder

measures volumeReliability

Accuracy

how close a measurement is to the true value

Precision

how close data points are to each other

Exactness Rule

always measure on manual instruments one significant digit past what the lines give you

Mass

the measurement of the amount of matter in an object

Weight

the measurement of the force of gravity on an object

What are the two methods of weighing substances?

Subtraction method, Tare method

Subtraction Method

weigh the container and then the container and substance together then subtract to get the mass of the substance

Tare Method

put the container on the balance and then press the tare key which will balance it out to zero

What should you use to measure a liquid?

graduated cylinder

What units are used to measure liquid?

mL

How do you find the volume of a regular solid object?

multiply the length, width, and height

What units are used for the volume of solid objects?

cm^3

How do you find the volume of an irregular solid object?

subtraction method

True or False: 1 mL \= 1 cm^3

True

Error

how far the data is off the accepted value

Absolute Error Formula

| accepted - experimental |

Percent Error Formula

| experimental value-accepted value | /accepted value x 100

Scientific Notation

used for displaying really small or big numbers

If a reaction gives off toxic fumes, where should it be done?

in the fume hood

What should you do if glassware breaks?

sweep it up and put in the broken glassware box

What’s the purpose of the lab safety shower?

If chemicals spill on you, it’ll wash off

After your lab station is cleaned, what is the most important thing you should do before leaving the lab?

wash your hands

If the fire alarm goes off, what should you do before evacuating the lab?

turn off all electrical equipment

How should you smell chemicals in the lab?

waft

What precautions should you take when heating a test tube in the lab?

point away from everyone and evenly heat

3 ways to put out a fire in the lab

fire blanket, fire extinguisher, stop drop and roll

PRACTICE MULTIPLYING AND DIVIDING SCIENTIFIC NOTATION! (answer: ok)

ok

If the independent variable value isn’t numeric, you should use a _____ graph

bar

If independent variable value is numeric, you should use a ____________

scatter plot

If independent variable value is numeric with a trend, you should use a _________

line graph