Chapter 3 & Chapter 4: Elements, Compounds and Mixtures, Solution and Suspensions and Separating Mixtures Flashcards

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1
Q

Define elements.

A

Elements are the basic building blocks of living and non-living matter. They cannot be broken down into simpler substances.

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2
Q

Define compounds.

A

They consist of 2 or more elements that are chemically combined together.

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3
Q

What are the characteristics of compounds?

A

They do not have the same properties as their constituent elements. The constituent elements of a compound are always chemically combined in a fixed proportion by mass. A compound cannot be separated into its constituent elements easily, it would need alot of energy to break it down.

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4
Q

Define mixture.

A

A mixture consists of two or more elements and/or compounds that are not chemically combined together

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5
Q

What are the characteristics of mixtures?

A

They have the same characteristics as their constituents. The constituents of a mixture can be separated easily and do not have a fixed proportion.

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6
Q

What is a solution?

A

A solution is a mixture in which one substance dissolves completely in another substance.

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7
Q

The substance that dissolves is called the ______

A

solute

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8
Q

The substance in which the solute dissolves in is called the ______

A

solvent

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9
Q

With a fixed volume of water, a solution with a low percentage of dissolved solute, it is known as a ___________. A solution with a high percentage of dissolved solute is known as ____________

A

dilute solution, concentrated solution

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10
Q

What is rate of dissolving?

A

It refers to how quickly the solute dissolves in a solvent.

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11
Q

What factors affect rate of dissolving?

A

Temperature of solvent, size of solute particles and rate of stirring.

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12
Q

What is solubility?

A

It refers to how well a solute dissolves in a fixed volume of a particular solvent.

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13
Q

What factors affect solubility?

A

Type of solute, type of solvent, temperature of solvent.

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14
Q

Define suspension.

A

It is a mixture that contains insoluble substances in a solvent.

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15
Q

What are the characteristics of a solution?

A
  1. Particles of the solute cannot be seen
  2. Solute does not settle to form solid deposits
    3.Light can pass through fully
  3. Cannot separate via filtration.
  4. Homogenous
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16
Q

What are the characteristics of a suspension?

A
  1. Insoluble substance can be seen
  2. Insoluble substances can settle to form solid deposits
  3. Light cannot pass through fully.
  4. Can separate via filtration.
  5. Heterogenous
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17
Q

What are the 6 ways a mixture can be separated into its constituents by physical methods?

A
  1. Magnetic attraction
  2. Filtration
  3. Evaporation
  4. Distillation
  5. Chromatography
  6. Separating funnel
18
Q

What does magnetic attraction do?

A

It separates magnetic materials from non-magnetic materials

19
Q

What is the liquid that can pass through the filter paper?

A

Filtrate

19
Q

What is the solid that is left at the filter paper called?

A

Residue

20
Q

What does filtration do?

A

It separates substances of different particle sizes

21
Q

What does evaporation do?

A

It obtains a dissolved solid from a liquid

22
Q

What is crystalisation used for?

A

For substances which will decompose

22
Q

When can you use evaporation to dryness?

A

For substances which will not decompose

23
Q

What is distillation used for?

A

To separate substances with different boiling points through boiling and condensation.

24
Q

What is the liquid that distills over called?

A

Distillate

25
Q

What are boiling chips for?

A

To ensure smooth boiling

26
Q

Where should the thermometer be placed at?

A

At the mouth of the condenser to measure the boiling point of the liquid.

27
Q

How does chromatography work?

A

Based on the solubility of the substance in a solvent.

28
Q

Why must the starting line be drawn in pencil?

A

The pencil lead will not dissolve in the solvent and thus will not affect the results

28
Q

What are separating funnels used for?

A

To separate immiscible liquids of different densities.

29
Q

What is chromatography used for?

A

To separate small amounts of substances that dissolve to different extents in a particular solvent.

30
Q

Why must the starting line be above the solvent level?

A

To prevent the sample on the starting line from dissolving directly into the solvent.

31
Q

What are immiscible liquids?

A

Liquid that do not mix together

32
Q

What is reverse osmosis used for?

A

To purify water through a partially permeable membrane to separate ions, unwanted molecules and larger particles.

32
Q

What does a partially permeable membrane have?

A

Very small pores that only water to pass through.

32
Q

How can you determine whether a substance is pure or impure?

A
  1. Measure its boiling point
  2. Chromatography
33
Q

Are elements pure or impure?

A

Pure

33
Q

How can you tell if a substance is pure or impure when you use boiling or melting?

A

Pure: Substance melts/ boils at a fixed temp
Impure: Substance melts/ boils over a range of temperature.

34
Q

Are mixtures pure or impure?

A

Impure

35
Q

Are compounds pure or impure?

A

Pure