Revision Grade 8

Atom/Mixture

100

It is an electron in the outer shell associated with an atom, and that can participate in the formation of bonding

Valance electron

200

The process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles

Filtration

300

Technique for separating dissolved chemical substances by taking advantage of their different rates of migration across sheets of paper

Chromatography

400

Write the electron configuration for the Sulfide ion?

2+8+8

500

How do separate sand and sugar mixtures?(all stages)

Mix with water

Filtrate

Evaporation

Bonding-1

100

Is a lasting attraction between atoms, ions, or molecules that enables the formation of chemical compounds. 

Chemical bond 

200

Name the compound below:

AlPO₄

Aluminum phosphate

300

Made from billions of carbon atoms

Each carbon forms a covalent bond with 4 carbon atom

All bonds are strong bonds

Properties 

The hardest substance

uHigh melting point(3550 degrees)

 Poor conductor

Diamond

400

What is the formula for Aluminum hydroxide

Al(OH)₃

500

Draw formation of bonding in Aluminum nitride 

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Bonding-1

100

This force of attraction exists between the shared electrons and the positive nucleus.

Covalent bond

200

It is a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons (in the form of an electron cloud of delocalized electrons) and positively charged metal ions.

Metallic bond

300

Name the compound below :

N₂O₅

Dinitrogen pentaoxide

400

What is the formula for tetra phosphorus hexaoxide?

P₄O₆

500

Draw formation of bonding in Water 

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Mole Concept

100

It is the proportionality factor that relates the number of constituent particles (usually molecules, atoms, or ions) in a sample with the amount of substance in that sample. Its SI unit is the reciprocal mole, and it is defined exactly as N_o = 6.02214076×1023 mol−1

Avogadro number

200

Balance chemical reaction : 

Fe + HCl------>FeCl₂ + H₂

Fe + 2HCl------>FeCl₂ + H₂

300

Calculate the number of particles for 112 grams of Calcium oxide (CaO). 

12.04x10²³

400

What is the mole ratio for the reaction below(Balance as needed) : 

K +H₂O----->KOH   +  H₂

2K +2H₂O----->2KOH   +  H₂

2:2:2:1

500

Calculate the number of particles in 980 grams of phosphoric acid .(H3PO₄)

60.2x10²³

^or 

6.02x10²⁴

Random

100

Any atom or molecule with a net charge, either positive or negative, is known as an ___

ion

200

I am God 

I am Planet

I am element

Mercury

300

An ion has 16 electrons and carries a -2 charge. What is the number of electrons in this ion?

18 electrons

400

-Each carbon bonded to three other carbons, with the 4th electron delocalized; can conduct electricity
-Hexagonal layers
-Strong covalent bonds within layers so high melting point
-Weak forces between layers so they slide over each other
-Low density as layers are far apart
-Insoluble

Graphite 

500

Balance the chemical equation below :

Al +HCl------>AlCl₃  +  H₂

2Al +6HCl------>2AlCl₃  +  3H₂