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substance
subatomics particles
solutions
distillation
chromatography
100

There are two main types of matter: pure substances and ...

mixtures

100

Which subatomic particles are only found in the nucleus of the atom?

protons and neutrons
100

What are the general names for the two components of a solution?

Solvent and solute

100

Distillation separates the components of a mixture based on differences in which property?

boiling point

100

Chromatography separates the components of a mixture based on differences in which property?

solubility

200

Pure substances can be either elements or ...

compounds

200

An atom of lithium has an atomic no. of 3 and a mass of 7. How many neutrons does it contains?

4

200

A ___ dissolves into a ___

solute; solvent

200

Which two state changes take place in the distillation apparatus?

boiling and condensing

200

In paper chromatography, the solvent is called the mobile phase. What is the paper called?

the stationary phase

300

How many sets of properties does a pure substance have?

1

300

What can you infer about the electron configuration of an atom in Period 3?

It has 3 electron shells

300

What term is used to describe a solution that cannot dissolve any more solute?

saturated

300

In a distillation of a mixture of ethanol and water, which component vaporises first?

ethanol

300

In paper chromatography graphite pencil is used as the baseline. Why is this?

Graphite is insoluble in most solvents.

400
There are two broad categories of mixture. Name both.

Homogeneous and heterogeneous.

400

What can you infer about the electron configuration of an atom in group 3?

It has 3 outer shell electrons

400
A 300 ml syrup solution is made using 15 g of sugar. What is the %m/v concentration?

5%

400

In some countries distillation is used to remove salt from seawater. What is the correct term for this prcoess?

Desalination

400

A sample travels 7 cm from the baseline while the solvent front moves 14 cm. What is the Rf value of the sample?

0.5

500
What name is given to a pure substance composed of two or more elements?

a compound

500

A neutral atom has an atomic number of 17. How many valence electrons does it have?

7

500

A student wants to prepare 250 mL of a 30% m/v syrup solution. How much sugar should they use?

30 = (X/250) x 100

0.3 = X/250

0.3 x 250 = X

75 = X

500

What is the full name of the cold-water jacketed condenser commonly used in laboratory distillation?

Liebig
500

What is the meaning of the initials Rf?

Retardation factor