|
Calculate the volume, mass and number of molecules of hydrogen
|
|
1
|
10898
|
October 19, 2016
|
|
Uppose that you are asked to calculate the amount of aluminium,
|
|
1
|
1093
|
October 19, 2016
|
|
How do we know that a chemical reaction has taken place?
|
|
0
|
4036
|
October 19, 2016
|
|
What change we observe by mixing of sodium sulphate and barium chloride?
|
|
0
|
1869
|
October 19, 2016
|
|
Write an activity when calcium oxide reacts with water
|
|
0
|
1312
|
October 19, 2016
|
|
Why do we apply paint on iron articles?
|
|
0
|
987
|
October 19, 2016
|
|
Freshly cut apple turning brown
|
|
1
|
750
|
October 19, 2016
|
|
Why the white washing gives shiny finish to the walls?
|
|
0
|
10115
|
October 19, 2016
|
|
What is oxidation-reduction reaction or redox reaction ? Give one example
|
|
0
|
598
|
October 19, 2016
|
|
What is an alloy?
|
|
0
|
3669
|
October 19, 2016
|
|
What is chemical change?
|
|
0
|
504
|
October 19, 2016
|
|
What is a balanced chemical equation?
|
|
0
|
481
|
October 19, 2016
|
|
What is the use of keeping food in air tight containers?
|
|
0
|
5254
|
October 19, 2016
|
|
Explain rancidity
|
|
0
|
980
|
October 19, 2016
|
|
What do you mean by corrosion ? How can you prevent it?
|
|
0
|
3500
|
October 19, 2016
|
|
In the refining of silver
|
|
1
|
1038
|
October 19, 2016
|
|
Give two examples for oxidation - reduction reaction
|
|
0
|
4184
|
October 19, 2016
|
|
Name the reactions taking place in the presence of sunlight
|
|
0
|
6406
|
October 19, 2016
|
|
What do you mean by precipitation reaction?
|
|
0
|
841
|
October 18, 2016
|
|
Write the balanced chemical equations for the following reactions
|
|
1
|
4633
|
October 18, 2016
|
|
What symbols do we use to indicate the physical state of reactants and products in an equation?
|
|
0
|
1697
|
October 18, 2016
|
|
Write some chemical reactions occurring in our daily life
|
|
0
|
575
|
October 18, 2016
|
|
What are the important characteristics of chemical reactions?
|
|
0
|
3619
|
October 18, 2016
|
|
What are the effects of oxidation on everyday life?
|
|
0
|
2809
|
October 18, 2016
|
|
How do you write a chemical equation?
|
|
0
|
5243
|
October 18, 2016
|
|
What do you observe during chemical change?
|
|
0
|
573
|
October 18, 2016
|
|
What do you mean by "rancidity"?
|
|
0
|
2781
|
October 18, 2016
|
|
What is corrosion?
|
|
0
|
10303
|
October 18, 2016
|
|
What is a reduction ? Give examples
|
|
0
|
3030
|
October 18, 2016
|
|
What is oxidation ? Give examples
|
|
0
|
6695
|
October 18, 2016
|