QUESTION 1 [10 MARKS] a) An experiment is carried out the reaction between solid sodium carbonate with aqueous
hydrogen sulphate to form aqueous sodium sulphate, carbon dioxide and water.

Na2CO3
H2SO4 ->
Na SO4 +
CO2 + H2O

i) Rewrite the given equation by adding an appropriate state symbols.

[1 mark]
ii) Calculate the number of moles of hydrogen sulphate required to react with 2.12 g of sodium
carbonate.

[2 marks]

iii) Calculate the concentration of sodium carbonate solution which prepared from 2.12 g of
sodium carbonate in 250.0 cm of volumetric flask.

[2 marks]

What happens to energy in an open system?

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced