Chemistry

Question 1

Implosion

Answer 1

an instance of something collapsing violently inwards

Question 2

Explosives

Answer 2

able or likely to shatter violently or burst apart.

Question 3

Pressure

Answer 3

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

Question 4

Physical change

Answer 4

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

Question 5

Chemical reaction

Answer 5

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

Question 6

Word equation

Answer 6

is an expression of a chemical reaction

Question 7

Reactivity series

Answer 7

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

Question 8

Oxidation

Answer 8

Gain of oxygen or loss of electrons

Question 9

Reduction

Answer 9

is the gain of electrons, loss of oxygen

Question 10

Sacrificial protection

Answer 10

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

Question 11

Oxidising agent

Answer 11

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

Question 12

Exothermic reaction

Answer 12

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

Question 13

Endothermic reaction

Answer 13

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

Question 14

Hydrocarbon

Answer 14

a compound of hydrogen and carbon only

Question 15

Displacement reaction

Answer 15

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

Question 16

Thermite reaction

Answer 16

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

Question 17

Native state

Answer 17

occurs in nature uncombined with other elements or pure

Question 18

Ore

Answer 18

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

Question 19

Electrolysis

Answer 19

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

Question 20

How to save iron from rsuting?

Answer 20

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

Question 21

The main element in the earth’s crust is ___

Answer 21

Oxygen

Question 22

Most common metal:

Answer 22

ALUMINIUM (8%)

Question 23

Second most common:

Answer 23

IRON (6%)

Question 24

Native means

Answer 24

found in its PURE form

Question 25

Example of native metals:

Answer 25

gold, copper, lead, aluminium, mercury, silver

Question 26

5. Scarce (metal) means

Answer 26

NOT MUCH OF THE ELEMENT = RARE

Question 27

6. The most used metal

Answer 27

iron

Question 28

Ore of aluminium

Answer 28

Bauxite

Question 29

Why we using high temperature to delete oxygen from iron?

Answer 29

Because in that situation carbon will connect with oxygen

Question 30

Solution

Answer 30

Solution is a mixture of a solute dissolved into a solvent

Question 31

Residue

Answer 31

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

Question 32

Filtrate

Answer 32

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

Question 33

Insoluble

Answer 33

Substance that does not dissolve in a solvent

Question 34

Filtration

Answer 34

The process of separating solids from liquids using filter paper

Question 35

Chromotography

Answer 35

Separating mixtures of soluble substances

Question 36

Condenser (distilation)

Answer 36

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

Question 37

Distillation

Answer 37

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

Question 38

Diffusion

Answer 38

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

Question 39

Fire triangle

Answer 39

Heat, oxygen and fuel

Question 40

Combosition Thermo decomposition

Answer 40

Burning Decompose of a substance using heat

Question 41

Solid to gas Gas to solid

Answer 41

Soblimation Deposition