WorksheetsBJU Section 2.1 Chemistry
Total questions: 24
Worksheet time: 30mins
Examples are diamonds (C) and Uranium (U)
elements
mixtures
compounds
diagram "a" is an example of a(n)
element
compound
mixture
diagram "b" is an example of a(n)
element
compound
mixture
diagram "c" is an example of a(n)
element
compound
mixture
diagram "d" is an example of a(n)
element
compound
mixture
What does this illustrate
Elements
Compunds
Mixture of Elements and Compunds
Mixture of Compounds
What has a formula?
Elements only
Compounds only
All Pure substances
Mixtures
Which of the following is matched incorrectly.
Milk: compound
Steel alloy: homogeneous mixture
Glucose (C6H12O6): compound
Cookies & Cream: heterogenous mixture
How man atoms of carbon are there?
1
2
3
4
How many different elements are present in H2COCH2
5
4
3
2
How many sulfur atoms are present in Al2(SO4)3
1
2
3
4
How many aluminum atoms are found in Al2O3?
1
2
3
4
4CF2Cl2
C = 4, F = 4, Cl = 2
C = 1, F = 8, Cl = 8
C = 4, F = 8, Cl = 8
C = 1, F = 4, Cl = 8
Coefficients in chemical formulas...
Multiply just the first atom
Add to the subscripts at the end of the molecule
Multiply elements without subscripts
Multiply EVERYTHING!
4CF2Cl2
C = 4, F = 4, Cl = 2
C = 1, F = 8, Cl = 8
C = 4, F = 8, Cl = 8
C = 1, F = 4, Cl = 8
How many different elements are present in this molecule?
3 NH4C2H3O2
15
36
5
4
What is the purpose of paper chromatography?
To identify different substances in a mixture
To calculate the volume of solvent used
To create colorful patterns on paper
To measure the length of paper
What is the stationary phase in paper chromatography?
A substance that the molecules can't move in
A substance that the molecules can move in
A type of gas
A thick liquid
What is the mobile phase in paper chromatography?
A thick liquid
A solid that the molecules can't move in
A liquid or gas that the molecules can move in
A type of solid
What is the purpose of drawing a baseline on the filter paper?
To mark the starting point for the sample of ink
To create a colorful design
To measure the length of the paper
To calculate the volume of solvent used
What is the purpose of placing a lid on top of the beaker during paper chromatography?
To increase the temperature of the solvent
To speed up the process
To mix the solvent and ink
To prevent the solvent from evaporating
What is the pattern of spots left on the filter paper called?
Solvent
Baseline
Chromatogram
Mobile phase
What does the rf value represent in paper chromatography?
The ratio of the distance travelled by the substance to the distance travelled by the solvent
The temperature of the solvent
The color of the solvent
The weight of the paper
What happens if a chemical is not soluble in the solvent during paper chromatography?
It evaporates from the paper
It dissolves in the solvent
It moves up the paper quickly
It stays on the baseline
What determines how fast each chemical moves up the paper in paper chromatography?
The type of pencil used
The properties of the substance
The color of the ink
The size of the filter paper
What would happen if the same paper chromatography experiment is done with a different solvent?
The chromatogram might look different and the rf value would be different
The chromatogram would look the same and the rf value would be the same
The experiment would fail
The paper would dissolve in the solvent
