Exp 1: Common Lab Operations

Chem 181; Experiment No. 1

Burning

Combustion is commonly called ____

Fuel

The substance that burns is usually referred to as _____

Carbon dioxide and water vapor

Complete combustion of a fuel yields _____

Incomplete combustion

_______ occurs when the supply of air or oxygen is poor.

Barrel

where the fuel and air mixes

Air hole

entrance of the air

Gas spud

regulates/controls the amount of fuel gas to be combusted

collar

regulates/controls the amount of air coming in and to close and open the air holes

Gas inlet

entrance of the fuel gas

Base

supports the Bunsen burner

Gas regulator

valve that controls the fuel gas coming in to the gas spud

Mouth

place of ignition

Mouth

Name that part: a

Barrel

Name that part: b

Airholes

Name that part: c

Collar

Name that part: d

Gas Spud

Name that part: e

Gas Regulator

Name that part: f

Gas Inlet

Name that part: g

base

Name that part: h

Lighting a bunsen burner

1. Half close air holes.

2. Open the gas regulator slightly and connect the Bunsen burner to the gas cock using rubbing tubing

3. Light a matchstick, hold it above the mouth of the Bunsen burner.

4. Open the gas cock slowly.

Blue

Non luminous color of flame, complete combustion

Yellow

Luminous color of flame, incomplete combustion

Non luminous Flame

the kind of flame used in the experiment...

Soot

Luminous flame produces black substance...

Yellow

Outer region of non luminous flame

Blue Violet

Intermediate/ Hottest Region of non luminous flame

sky or light blue

Inner/ Coolest region of non luminous flame

Meniscus

curve line present in a liquid inside the container

Upper and Lower Meniscus

Types of meniscus:

Transparent liquid

kind of liquids, eye must be level at the lower meniscus

Colored and opaque liquid

kind of liquids, eye must be level at the upper meniscus

Heating liquid in a test tube

1. Fill the test tube with not more than ¾ of liquid.

2. Hold test tube with test tube holder

3. Incline test tube at about 45 0 angle with the flame

4. Subject the flame at the middle of the test tube near the top of the liquid

5. Move the test tube back and forth

6. When the liquid starts to boil, remove the test tube from the flame

Wafting

When smelling any chemical or substance, do so by ________ it towards you. Don't sniff it from the container.

physical processes of separation

it is a separation of each components/substances in a given mixtures

filtration, decantation, distillation, evaporation, condensation, sublimation, magnetism, sorting, extraction

kinds of physical processes

white crystal

What substance is clinging at the bottom of the watch glass

Supernatant liquid

What is the term given to the clear liquid and the solid left at the container? it contains salt, water, coloring

filtrate

the clear liquid that pass through the filter paper is called

Residue

What is the term given to the solid left after evaporation?

sodium chloride crystal

Give the chemical name of the white residue/solid.