Lab equipment and safety

Lab Equipment and Safety

​Narrow cylinder used for measuring liquid volume. Always read at eye level ​and from bottom of curved meniscus. More accurate than a beaker.

​Some text here about the topic of discussion.

​Graduated Cylinder

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​Flat bottom container used for mixing and pouring liquids. Use proper tongs for holding and transporting heated glassware.

​Beaker

​Flat-bottomed flask ​with triangular body and narrow neck that is often used for holding or heating liquids that may splatter or release gases.

​Erlenmeyer Flask

A narrow glass tube with a rounded bottom used for holding, mixing, and heating small amounts of substances. Use proper clamps to safely hold and transport test tubes.​

​Test tube

Used for safely sorting, holding, transporting, and storing multiple test tubes.

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​Test Tube Rack

Tapered tubes with bulb at top used for transferring small amounts of liquid.

​Eyedroppers allow for adding single drops of liquid.

​Droppers

Specialized droppers that allow for more accurate volume measurement than eyedroppers.

​Pipette

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Various tubes with wide openings and narrow stems

​that allow for substance transfer between containers without spillage.

​Funnel

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Tool for measuring temperature. Temperature should be read and recorded in the SI unit of measure degrees Celsius.

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Thermometer

A balance used to measure mass. Contains three counterweights for more accurate measurement.

​Read and record masses in milligrams, gram, or kilograms.

​Triple Beam Balance

Instrument used for magnifying and viewing small objects. The compound light microscope is commonly used in biology classrooms.

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​Microscope

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Eye protection while working in the science laboratory. Always wear your goggles in the science lab unless instructed by your teacher.

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Goggles

​Lab Safety

General Lab Safety - YouTube Kids

6. Avoid wearing loose clothing or accessories.

7. Wear goggles when appropriate.

8. Wash your hands after each lab.​

9. ​Handle equipment such as the microscope with two hands.

1. Wear closed-toe shoes

2. Tie your hair back

3. Do not play around in the lab

4. Place bookbags neatly in a safe are out of the lab.

5. Do not touch or step on broken glass. Let the teacher know.

​Science Applications

A modern form of the metric system, called the International System (SI), provides the standard measurements that all scientists around the world can understand.​

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​Measure in SI

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Multiple Choice

How many grams equal one kilogram?

• 10

• 1000

• 1

• 0.1

Multiple Choice

Is a milligram larger or smaller than a gram?

• larger

• neither

• the same

• smaller

When making measurements, the value recorded depends on the precision of the measuring instrument.

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p. MH-16​

​Precision and Significant Digits

Multiple Choice

How many significant digits are in the measurement 7,071,301 m?

• 3

• 5

• 7

• I'm not sure

Multiple Choice

How many significant digits are in the measurement 0.003010 g?

• 2

• 4

• 7

• 5

When adding, subtracting, multiplying or dividing numbers with different precision, round the numbers to the smallest number of decimal places of any number in the sum, difference, being multiplied or divided.

​Find the sum.

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5.28 2 digits after the decimal point

+ 5.2 1 digit after the decimal point

10.48​ m

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The sum is 10.5 m​

Multiple Choice

Multiply 5.28 and 5.2 using the rule for multiplying and dividing. Record the answer using the correct number of significant digits.

• 27.456

• 27.46

• 27.5

• 27.0

​A graph is a visual representation of data.

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Make and Use Graphs

A line graph shows a relationship between two variables that change continuously. The independent variable is changed and is plotted on the x-axis. The dependent variable is observed and is plotted on the y-axis.

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Line Graph

Draw

A puppy's shoulder height is measured during the first year of her life. The following measurements were collected: (3 mo., 52 cm), (6mo., 72 cm), (9 mo., 83 cm), (12 mo., 86 cm) Graph this data.

​To compare data that does not change continuously. A bar graph uses bars to show the relationships between variables.

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The x-axis variable is divided into parts. The y-axis is a number and increases continuously along the axis.​

Bar Graph

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To display data as parts of a whole. A circle graph is a circle divided into sections that represent the relative size of each piece of data. The entire circle represents 100%, half represents 50% and so on.​

Circle Graph​

Open Ended

Draw a bar graph of the gases in air: 78% nitrogen, 21% oxygen, 1% other gases?