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Midterms (1st Sem.) > Chem. Lab. > Flashcards

Chem. Lab. Flashcards

1
Q

It is the process of separating components of a mixture.

A

Chromatography

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2
Q

Several types of Chromatography:

A
  • Elution or column;
  • Paper;
  • Thin layer;
  • Gas chromatography.
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3
Q

These are the two phases in Chromatography:

A
  • Stationary phase
  • Mobile phase
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4
Q

The phase in which the mobile phase passes, like the special filter-type of paper.

A

Stationary phase

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5
Q

It is a phase that passes in and around the stationary phase and is characterized as solvent or a mixture of solvents.

A

Mobile phase

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6
Q

It refers to the mixture of organic compounds applied as a spot on the paper to be distributed between the two phases.

A

Solute

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7
Q

It refers to the liquid where the paper is placed in that moves more rapidly than the solute.

A

Solvent

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8
Q

It refers to the ratio of the rate of movement of the solute to the rate of movement of the developing solvent. The ratio can be expressed in terms of the distances moved by each.

A

RF value (rate of flow)

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9
Q

It is a form of matter that refers to combinations of two or more elements and/or compounds. Thus, it has no constant composition.

A

Mixture

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10
Q

It is a form of matter that has a constant and definite composition and properties.

A

Substance

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11
Q

This compound contains the element carbon and hydrogen.

A

Organic compound

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12
Q

This compound has no eitheir carbon nor hydrogen.

A

Inorganic compound

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13
Q

It refers to the temperature at which the solids melts or turns into a liquid state.

A

Melting point

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14
Q

It is defined as the temperature at which the liquid and solid phases are in equilibrium.

A

Melting point of a solid

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15
Q

It is known as the melting point range of a solid.

A

0.5 - 1.0°C

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16
Q

It generally melts sharply because the forces of attraction between its particles are the same.

A

Pure solid

17
Q

It melts at lower temperature and over a wider ranger.

A

Impure solid

18
Q

It is defined as the temperature range over which a small amount of solid in a thin walled capillary tube first visibly softens (first drop of liquid) and then completely liquefies.

A

Capillary melting point

19
Q

Solid’s melting point is useful not only as an aid in identification but also as an indication of ____?

A

Purity

20
Q

It refers to the temperature at which the vapor pressure of the liquid exactly equals the pressure exerted on it, causing the liquid to “boil” or change to the gas phase.

A

Boiling point

21
Q

The close proximity of molecules in the liquid state allow these molecules to interact via _____?

A

Non-covalent interactions (dipole-dipole, H-bonding, van der Waals forces)

22
Q

True or False

No covalent bonds are broken during a change from the liquid phase to the gas phase.

A

True

23
Q

True or false

If lack of energy (often in the form of heat) is provided to the liquid, the molecules begin to move away from each other by “breaking” the non-covalent forces that hold the compound in the liquid state.

A

False - If enough energy

24
Q

These are two processes through which matter changes from one state to another.

A
  • Evaporation
  • Condensation
25
Q

It is a process where matter changes from liquid to gas.

A

Evaporation

26
Q

It is a process where matter changes from gas to liquid.

A

Condensation

27
Q

It refers to examining mixture, its components, and their relationships to one another.

A

Analyze

28
Q

It refers to determining the identity of mixture or components based on known components (if acidic…)

A

Identify

29
Q

It refers to separation of components in order to isolate one of interest for further study.

A

Purify

30
Q

It refers to the determination of the amount of mixture and/or components present in sample.

A

Quantify

31
Q

It refers to the natural attraction or force between things.

A

Affinity

32
Q

It is used as a substitute for paraffin in boiling point determination.

A

Oil

33
Q

It is placed in the beaker and used as the heating medium for boiling point determination.

A

Oil

34
Q

It is used as the organic solvent on boiling point determination.

A

Butanol

35
Q

Chromatography is used by scientists to:

A
  • Analyze
  • Identify
  • Purify
  • Quantify
36
Q

It is a laboratory technique that separates components within a mixture by using the differential affinities of components for a mobile medium and for stationary absorbing medium through which they pass.

A

Chromatography

37
Q

Showing difference; distinctive

A

Differential

38
Q

The organic compound used in melting point determination.

A

Benzoic acid

39
Q

The impure solid used in melting point determination.

A

Napthalene balls

Midterms (1st Sem.) (7 decks)

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