|
Calculate the volume, mass and number of molecules of hydrogen
|
|
1
|
11221
|
October 19, 2016
|
|
Uppose that you are asked to calculate the amount of aluminium,
|
|
1
|
1152
|
October 19, 2016
|
|
How do we know that a chemical reaction has taken place?
|
|
0
|
4068
|
October 19, 2016
|
|
What change we observe by mixing of sodium sulphate and barium chloride?
|
|
0
|
1975
|
October 19, 2016
|
|
Write an activity when calcium oxide reacts with water
|
|
0
|
1355
|
October 19, 2016
|
|
Why do we apply paint on iron articles?
|
|
0
|
1017
|
October 19, 2016
|
|
Freshly cut apple turning brown
|
|
1
|
789
|
October 19, 2016
|
|
Why the white washing gives shiny finish to the walls?
|
|
0
|
10196
|
October 19, 2016
|
|
What is oxidation-reduction reaction or redox reaction ? Give one example
|
|
0
|
623
|
October 19, 2016
|
|
What is an alloy?
|
|
0
|
3723
|
October 19, 2016
|
|
What is chemical change?
|
|
0
|
530
|
October 19, 2016
|
|
What is a balanced chemical equation?
|
|
0
|
508
|
October 19, 2016
|
|
What is the use of keeping food in air tight containers?
|
|
0
|
5314
|
October 19, 2016
|
|
Explain rancidity
|
|
0
|
1052
|
October 19, 2016
|
|
What do you mean by corrosion ? How can you prevent it?
|
|
0
|
3550
|
October 19, 2016
|
|
In the refining of silver
|
|
1
|
1086
|
October 19, 2016
|
|
Give two examples for oxidation - reduction reaction
|
|
0
|
4323
|
October 19, 2016
|
|
Name the reactions taking place in the presence of sunlight
|
|
0
|
6458
|
October 19, 2016
|
|
What do you mean by precipitation reaction?
|
|
0
|
872
|
October 18, 2016
|
|
Write the balanced chemical equations for the following reactions
|
|
1
|
4760
|
October 18, 2016
|
|
What symbols do we use to indicate the physical state of reactants and products in an equation?
|
|
0
|
1786
|
October 18, 2016
|
|
Write some chemical reactions occurring in our daily life
|
|
0
|
608
|
October 18, 2016
|
|
What are the important characteristics of chemical reactions?
|
|
0
|
3677
|
October 18, 2016
|
|
What are the effects of oxidation on everyday life?
|
|
0
|
2841
|
October 18, 2016
|
|
How do you write a chemical equation?
|
|
0
|
5319
|
October 18, 2016
|
|
What do you observe during chemical change?
|
|
0
|
598
|
October 18, 2016
|
|
What do you mean by "rancidity"?
|
|
0
|
2837
|
October 18, 2016
|
|
What is corrosion?
|
|
0
|
10354
|
October 18, 2016
|
|
What is a reduction ? Give examples
|
|
0
|
3503
|
October 18, 2016
|
|
What is oxidation ? Give examples
|
|
0
|
7662
|
October 18, 2016
|