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chemistry

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65 questions


List of fine chemicals 
List of fine chemicals 
2 months ago 1 answer(s) 3 votes


Calculate the percentage by mass of sodium in anhydrous sodi...
Calculate the percentage by mass of sodium in anhydrous sodium tetraoxo-sulphate (VI), Na2SO4.
3 months ago 1 answer(s) 1 votes


An alkanol containing 60% carbon by mass would have a molecu...
An alkanol containing 60% carbon by mass would have a molecular formula.
9 months ago 1 answer(s) 2 votes


1.0g of CaCO3 was treated with excess 0.1M HCl. At the end o...
1.0g of CaCO3 was treated with excess 0.1M HCl. At the end of the reaction, the acid still left unreacted required 25cm³ of 0.1M Na2CO3 to neutralise it...
9 months ago 1 answer(s) 4 votes


Which processes are exothermic?      I. Ice ...
Which processes are exothermic?      I. Ice melting      II. Neutralization      III. Co...
10 months ago 1 answer(s) 2 votes


Which statements about bonding is correct? A. Bond breaking...
Which statements about bonding is correct? A. Bond breaking is endothermic and requires energy B. Bond breaking is endothermic and releases e...
10 months ago 1 answer(s) 3 votes


The specific heat of iron is 0.450Jg-1K-1. What is the energ...
The specific heat of iron is 0.450Jg-1K-1. What is the energy, in J required to increase the temperature of 50.0g of iron by 20.0K?...
10 months ago 1 answer(s) 3 votes


An example of biodegradable pollutant is A. plastic B. sew...
An example of biodegradable pollutant is A. plastic B. sewage C. carbon (II) oxide D. hydrogen sulphide
10 months ago 1 answer(s) 3 votes


Calcium chloride is an ionic compound. Which of the followin...
Calcium chloride is an ionic compound. Which of the following statements account for its ionic character? I. Calcium has high ionization energy ...
10 months ago 1 answer(s) 5 votes