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Chemistry Flashcards

1
Q

Implosion

A

an instance of something collapsing violently inwards

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2
Q

Explosives

A

able or likely to shatter violently or burst apart.

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3
Q

Pressure

A

continuous physical force exerted on or against an object by something in contact with it.

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4
Q

Physical change

A

occur when objects or substances undergo a change that does not change their chemical composition . They are usually reversible.

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5
Q

Chemical reaction

A

a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

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6
Q

Word equation

A

is an expression of a chemical reaction

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7
Q

Reactivity series

A

of metals is a chart listing metals in order of decreasing reactivity.

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8
Q

Oxidation

A

Gain of oxygen or loss of electrons

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9
Q

Reduction

A

is the gain of electrons, loss of oxygen

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10
Q

Sacrificial protection

A

is a corrosion protection method in which a more reactive metal is attached to a less active metal, preventing it from corroding.

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11
Q

Oxidising agent

A

Oxidising agents are substances that provide oxygen or accept/ gain electrons

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12
Q

Exothermic reaction

A

Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases

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13
Q

Endothermic reaction

A

Endothermic reactions take in energy and the temperature of the surroundings decreases.

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14
Q

Hydrocarbon

A

a compound of hydrogen and carbon only

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15
Q

Displacement reaction

A

occurs when a more reactive element displaces, or pushes out, a less reactive element from a compound that contains the less reactive

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16
Q

Thermite reaction

A

A thermite reaction is a general name for an exothermic (heat-releasing) reaction between iron oxides and aluminium

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17
Q

Native state

A

occurs in nature uncombined with other elements or pure

18
Q

Ore

A

is a rock that contains enough of a metal or a metal compound to make extracting the metal worthwhile

19
Q

Electrolysis

A

is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them

20
Q

How to save iron from rsuting?

A

By puting on it paints, oil or reactive metals (for example magnesium or zinc)

21
Q

The main element in the earth’s crust is ___

A

Oxygen

22
Q

Most common metal:

A

ALUMINIUM (8%)

23
Q

Second most common:

A

IRON (6%)

24
Q

Native means

A

found in its PURE form

25
Q

Example of native metals:

A

gold, copper, lead, aluminium, mercury, silver

26
Q
  1. Scarce (metal) means
A

NOT MUCH OF THE ELEMENT = RARE

27
Q
  1. The most used metal
A

iron

28
Q

Ore of aluminium

A

Bauxite

29
Q

Why we using high temperature to delete oxygen from iron?

A

Because in that situation carbon will connect with oxygen

30
Q

Solution

A

Solution is a mixture of a solute dissolved into a solvent

31
Q

Residue

A

The solid that doesn’t pass through filter paper during filtration

32
Q

Filtrate

A

The liquid that pass through filter paper during filtration. (It is usualy still not very clear)

33
Q

Insoluble

A

Substance that does not dissolve in a solvent

34
Q

Filtration

A

The process of separating solids from liquids using filter paper

35
Q

Chromotography

A

Separating mixtures of soluble substances

36
Q

Condenser (distilation)

A

Part of distilation machine that cools down a liquid and making liquid condensate.

37
Q

Distillation

A

S``eparation technique used to separate liquid (the solvent) from a mixture and keep the liquid part.

38
Q

Diffusion

A

Process by which particles of one substance spread out through the particles of another substance.

39
Q

Fire triangle

A

Heat, oxygen and fuel

40
Q

Combosition
Thermo decomposition

A

Burning
Decompose of a substance using heat

41
Q

Solid to gas
Gas to solid

A

Soblimation
Deposition

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