10th Science Dictionary

 10th Science Dictionary 

A

    B    

Balanced equation has the same number of atoms of each element on both sides

      C    

Chemical change: one or more new substances with new physical and chemical properties are formed.

Chemical reaction is a process in which one or more substances (reactants) are transformed into different substances (products).

Chemical equation is the symbolic representation of a chemical reaction.

Calcination: Carbonate ore is heated strongly in limited air to convert ore into metal oxide.

D

E

F

G

H

I

J

K

L

M

N

O

P

Physical change:  change in colour or state occurs, but no new substance is formed.

Q

R

Roasting: Sulphide ore is in heated strongly in the presence of excess air to convert ore into metal oxide. 

   S  

Saturated Hydrocarbons: Have single bond between carbon-carbon atoms 

T

   U  

Unsaturated Hydrocarbons: Have double or triple bonds between carboncarbon atoms 

V

Valency: is the combining capacity of an element.

W

Word equation:  is a chemical reaction expressed in words rather than chemical formulas. It helps identify the reactants and products in a chemical reaction.

X

Y

Z