Basic Lab Techniques

Question 1

List 12 Laboratory Techniques

Question 2

A rugged, inexpensive weighing instrument used in measuring mass. It is named for the three beam which carry weights.

Answer 2

Triple Beam Balance

Question 3

Used for preparative work where an error of ±0.02 g is acceptable.

Answer 3

Top Load Balance

Question 4

highly sensitive lab instruments designed to accurately measure mass. Their readability has a range between 0.1mg - 0.01mg.

Answer 4

Analytical Balance

Question 5

List all the steps in transferring liquids using pipettes.

Answer 5

1. Using chemical suction
2. Wipe off outside of pipette with gauze
3. Adjusting the meniscus
4. Drain into receiving vessel

Question 6

process where liquid is converted to a gaseous state through wind and air temperature changes

Answer 6

Evaporation

Question 7

technique used to separate solids from liquids, is the act of pouring a mixture onto a membrane (filter paper) that allows the passage of liquid (the filtrate) and results in the collection of the solid.

Answer 7

Filtration

Question 8

process that can be used to separate a pure liquid from a mixture of liquids. It works when the liquids have different boiling point

Answer 8

Distillation

Question 9

This refers to heating a solution with an attached condenser to prevent reagents from escaping. “ to increase the rate of chemical reaction”

Answer 9

Reflux Heating

Question 10

used in the identification of certain metals. It is based on the observation that light emitted by any element gives a unique spectrum

Answer 10

Flame Test

Question 11

Which of the following apparatus is not included in the distillation setup?

• Hot plate
• Condenser
• Adapter
• Thermometer
• Test tube

Answer 11

Hot plate (not sure)

Question 12

List all the basic laboratory technique

Answer 12

1. Measuring mass
2. Measuring volume
3. Heating and evaporation
4. Distillation
5. Filtration
6. Reflux heating
7. Flame test
8. Sublimation
9. Decantation

Question 13

solid to gas

Answer 13

Sublimation

Question 14

the process of separation of liquid from solid and other immiscible (non-mixing) liquids, by removing the liquid layer at the top from the layer of solid or liquid below

Answer 14

Decantation

Question 14

also known as a sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom

Answer 14

Test tube

Question 15

laboratory equipment used to hold upright multiple test tubes at the same time

Answer 15

Test tube rack/stand

Question 16

is a brush used for cleaning test tubes and narrow mouth laboratory glassware, such as graduated cylinders, burettes, and Erlenmeyer flasks

Answer 16

Test tube brush/spout brush

Question 17

used to hold test tubes. It is used for holding a test tube in place when the tube is hot or should not be touched

Answer 17

Test tube holder

Question 18

Used as containers, is available in a variety of sizes. Although they possess volume markings, these are only rough estimates of the liquid volume. The markings are not necessarily accurate.

Answer 18

Beakers

Question 19

Often used as reaction vessels, particularly in titrations. As with beakers, the volume marking should not be considered accurate.

Answer 19

Erlenmeyer Flask

Question 20

Used to measure and store solutions with a high degree of accuracy.

Answer 20

Volumetric Flask

Question 21

Used to transfer liquids with a moderate degree of accuracy.

Answer 21

Graduated Cylinder

Question 22

Used for transferring liquids with a fixed volume and quantity of liquid must be known to a high degree of accuracy.

Answer 22

Pipette

Question 23

These are made of plastic and are useful for transferring liquids dropwise.

Answer 23

Disposable Pipette

Question 24

A tube or pipe that is wide at the top and narrow at the bottom, used for guiding or powder into a small opening.

Answer 24

Funnel

Question 25

It is a small dish shaped like a cylinder.

Answer 25

Petri Dish

Question 26

Used to mix chemicals and liquids for laboratory purposes. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends.

Answer 26

Glass/Stirring Rod

Question 27

It is a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine substances from liquids or air. It is used in science labs to remove solids from liquids.

Answer 27

Filter paper

Question 28

A circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance and as a cover for a beaker.

Answer 28

Watch Glass

Question 29

Used to prepare ingredients or substances by crushing and grinding them into a fine paste or powder in the laboratory.

Answer 29

Mortar and Pestle

Question 30

It contains a chemical that changes color as it makes contact with an acid or base. The paper will turn red in acids and blue in bases.

Answer 30

Litmus and pH paper

Question 31

Always add acid to _______.

Answer 31

Water

Question 32

What is the proper measurement of the volume of a colorless liquid? * Above the meniscus * Below the meniscus * At the center of the meniscus

Answer 32

At the center of the meniscus

Question 33

What are the two physical changes involved in the distillation setup?

Answer 33

Evaporation and condensation

Question 34

What is the liquid you obtained after filtration setup

Answer 34

Residue

Question 35

At what part of the Bunsen burner where the amount of air that enters is controlled?

Answer 35

Collar

Question 35

What is important to remember while you are using heat? * Do not heat closed containers * Point the mouth of the container away from yourself and classmates. * Always use clamps to hold the container. * All of the above

Answer 35

All of the above

Question 36

True or False: Observing proper and correct laboratory techniques is important in maintaining safety and attaining accurate results

Answer 36

True