TYPES OF MATTER Exercise 1: Scavenger Hunt Table 1: Identifying Types of Substan

Question

TYPES OF MATTER

Exercise 1: Scavenger Hunt

Table 1: Identifying Types of Substances

Pure Substance

Heterogeneous Mixture

Homogeneous Mixture

Table Salt

Baking Soda

Vegetable Oil

Trash

Dishwashing Soap

Salad

Water

Butter

Chocolate Milk

Trail Mix

Record your examples here:

Photo

Classification

Table 2: Identifying Physical and Chemical Changes

Physical Change

Chemical Change

A Candle Burning

Freezing Water

Breaking a Pencil

Grilling a Hamburger

Milk Going Sour

Crushing a Can

Slicing an Apple

Bananas Rotting

Baking a Cake

Record your examples here:

Photo

Classification

Experiment 2: Chromatography of Inks

Table 3: Ink Chromatography Results

Ink Sample

Number of Bands

Color and Description of Bands

uni-ball®

Paper Mate®

Will Signature

Pen Sample 1 (Student Chooses):

Pen Sample 1 (Student Chooses):

Insert the photo of your chromatographs here:

Post-Lab Questions

1.     Based on the results of the paper chromatography, which pen most likely used to create the forged signature on the will? Use your data to support your answer.

2.     What kind of change alters the identity of a material?

3.     Which type of mixture would be easier to separate, heterogeneous or homogeneous? Explain your answer.

4.     An unused flashbulb contains magnesium and oxygen. After use, the contents are changed to magnesium oxide, but the total mass does not change. How can this observation be explained?

5.    

Pure Substance

Heterogeneous Mixture

Homogeneous Mixture

Table Salt

Baking Soda

Vegetable Oil

Trash

Dishwashing Soap

Salad

Water

Butter

Chocolate Milk

Trail Mix

Explanation / Answer

TABLE 1

TABLE 2:

TABLE 3:

Cromatography is the study of separation of various colors in the ball point ink.Here the model isn't specified so number of bands and component color will vary for various models of a particular band.

For eg,one sample from the brand of Papermate and was found differed from another model The colour profiles, i.e. relative intensity of colour and shape of the separated bands, of both models of PM were appeared very different to each other. It seemed like Papermate was filled dissimilar inks for different models under its brand.

POST LAB QUESTIONS:

1.Nowadays, crimes related to forged documents are increasing.To avoid getting caught while forging a signature ,we need to check discrimination power of high performance thin layer chromatography (HPTLC) technique for analyzing a set of blue ballpoint pen inks. The discriminative power should be less for the pen we are using so that a significant number of samples can't be differentiated and you wont get caught.

2.Chemical changes alter the identity of the material.This is because bonds are broken/formed between molecules.Usually one substance with a set of properties is changed into another substance with different properties.

3.A heterogeneous substance is a substance which is usually a mixture of chemical substances which are easily distinguishable and hence can be seperated by simple physical means.However homogeneous substances blend into eachother and would require complex processes of separation.

4Law of Conservation of Mass.Total mass of a substance will not change in a chemical reaction.Matter can neither be created nor be destroyed.

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