Table: Properties of Some Pure Substances

SNC1D CLASSIFYING CHEMICALS LAB
PROBLEM: Classify the following unknown materials as mechanical mixtures, solutions or pure substances.
MATERIALS:
·  10 samples of unknown materials
·  data table about properties of pure substances
PROCEDURE:
1. Examine each sample and describe its properties. Make sure to note information on the labels.
ANALYSIS:
1. Compare the properties of the unknown materials to the pure substances on the data table. Classify each unknown substance as a mechanical mixture, a solution or a pure substance.
2. a) If an unknown sample is a pure substance, identify the pure substance.
b) If an unknown sample is a mechanical mixture or a solution, identify what pure substances it might contain.

SNC1D Classifying Chemicals Lab

TABLE: PROPERTIES OF SOME PURE SUBSTANCES

PURE SUBSTANCE / MELTING POINT (0C) / BOILING POINT (0C) / DENSITY (g/cm3) / APPEARANCE
ethanol (alcohol) / -115 / 78 / 0.8 / clear colourless liquid
aluminum / 660 / Substance decomposes(break apart) rather than change state. / 2.7 / silvery-coloured solid
sodium bicarbonate (baking soda) / Substance decomposes(break apart) rather than change state. / Substance decomposes(break apart) rather than change state. / 2.2 / white solid
copper (II) sulphate (bluestone) / Substance decomposes(break apart) rather than change state. / Substance decomposes(break apart) rather than change state. / 2.3 / blue solid crystals
carbon (diamond) / 3500 / 3930 / 3.5 / colourless solid crystals
carbon (graphite) / 4000 / 3930 / 2.3 / grey-black solid
copper / 1084 / 2336 / 9.0 / shiny reddish solid
glycerol (glycerine) / 18 / Substance decomposes(break apart) rather than change state. / 1.2 / colourless thick liquid
iron / 1535 / 3000 / 7.9 / grey solid
lead / 327 / 1750 / 1.3 / blue-grey solid
calcium carbonate (limestone) / Substance decomposes(break apart) rather than change state. / Substance decomposes(break apart) rather than change state. / 2.9 / grey-white solid
naphthalene / 80 / 216 / 1.2 / white solid
sodium chloride (table salt) / 801 / 1465 / 2.2 / white solid
calcium hydroxide (slaked lime) / Substance decomposes(break apart) rather than change state. / Substance decomposes(break apart) rather than change state. / 2.2 / white solid
sucrose (sugar) / 170 / Substance decomposes(break apart) rather than change state. / 1.6 / white solid
sulphur / 113 / 445 / 2.1 / yellow solid
tin / 232 / 2270 / 7.3 / silvery-yellowish solid
water / 0 / 100 / 1.0 / clear colourless liquid

SNC1D Classifying Chemicals Lab Name:

Date:

Purpose:

Observations & Analysis:

Sample
Number / Observed
Properties / Information on Label / Classification
(mechanical mixture, pure substance, solution) / Reasons for Classification / Substance if pure identify.
1
2
3
4
5
6
7
8
9
10

Expectations: C2.1, C2.3, C3.4