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Advanced Higher Chemistry > Unit 4 Glossary > Flashcards

Unit 4 Glossary Flashcards

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1
Q

Define accuracy

A

A measure of the agreement between a measurement and the true or correct value

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2
Q

Define actual yield

A

The quantity of a product that is obtained from a chemical reaction

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3
Q

Define anomalous data

A

Data with unexpected values that do not match the relationship observed in previous measurements

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4
Q

Define atom economy

A

A ratio of the total mass of atoms in the desired product to the total mass of atoms in the reactants

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5
Q

What is a back titration

A

A titration pre-formed when an insoluble and so reacting reagent is treated with an excess of an acid or base

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6
Q

Define chromatography

A

Attend technique for analysing or separating mixtures of gases liquids or dissolved substances based on differential solubility in two phases

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7
Q

What is a colorimeter

A

An instrument used to measure the intensity of colour in a solution

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8
Q

Define concentration

A

The ratio of amount of a substance dissolves in a given volume of solution

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9
Q

What is a dependent variable

A

The variable that is measured during an investigation

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10
Q

What is emission spectroscopy

A

The study of emission spectra produced by excited substances

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11
Q

What is gravimetric analysis

A

A method of quantitive analysis for finding the Composition and formula of compound is based on an accurate weighing of reactants and products

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12
Q

What is an independent variable

A

The variable that is manipulated or change during an investigation

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13
Q

Define literature value

A

A value from the chemical literature or a physical constant or experimental measurement

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14
Q

What is a mobile phase

A

Liquid or gas which personally through or along stationary phase during chromatography

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15
Q

Define percentage error

A

And Erin expressed as a percentage of the value measured or the true value

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16
Q

Define percentage uncertainty

A

Random uncertainty/actual measurement times 100

17
Q

Define percentage yield

A

The actual yield as a percentage of the theoretical yield

18
Q

Define precision

A

The total amount of random error present in a measurement indicates how close together a series of measurements are

19
Q

Define qualitative analysis

A

Analysis used to identify the substance but not the quantity of the substance

20
Q

Define quantitative analysis

A

Analysis used to determine the quantity of each component of the material or substance

21
Q

What is a redox reaction

A

Reaction involving reduction or oxidation which results in one or more electrons being transferred and is accompanied by changes in oxidation numbers

22
Q

What is a redox titration

A

A titration used to determine the concentration of a solution of an oxidising or reducing agent

23
Q

Define retention time

A

The time between injection of a substance into a chromatography column and the appearance of the peak

24
Q

What is a separating funnel

A

Fun over the top at the lower end of the stopper in the tool used to separate immiscible liquids

25
Q

What is solvent extraction

A

A method for separating a compound from a mixture by causing it to move to another solvent

26
Q

What is a standard solution

A

A solution his concentration is actually known and which does not change with time

27
Q

What is the stationary phase

A

One of the two faces forming a crow much to graphic system which may be solid jail or liquid

28
Q

What is steam distillation

A

A technique used to purify organic substances that are immiscible with water and which would decomposed if distilled

29
Q

Define systematic error

A

An error which bias is your measurements in some predictable way

30
Q

What is theoretical yield

A

The maximum amount of mass of a particular product that can be formed when the limiting reactant is completely consumed and there is no losses or side

31
Q

Define titration

A

A chemical technique in which one solution is used to analyse another solution and find its concentration or amount

32
Q

What is vacuum filtration

A

A mixture of solid and liquid is poor through a filter paper in Büchner funnel the solid is trapped by the filter and the liquid is drawn through the funnel into the flask bellow by a vacuum

33
Q

Define water of crystallisation

A

Water molecules contained in the crystal lattice of organic salts when Play crystallise from aqueos solution

Advanced Higher Chemistry (4 decks)

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