100g->50g->25g->12.5g make its four numbers of half lives.
4 Half-Lives = 15.6 years. What about,
1 half life= ?
(1×15.6)÷4 = 3.9 years.
half life =3.9 years
kawasaki_254 answered the question on July 5, 2018 at 02:11
- Copper (II) oxide and charcoal are both black solids. Describe how you can distinguish them.(Solved)
Copper (II) oxide and charcoal are both black solids. Describe how you can distinguish them.
Date posted: July 1, 2018. Answers (1)
- Explain the following observations. When burning magnesium is lowered into a gas jar of carbon(4) oxide it continues burning, but when burning zinc is lowered into...(Solved)
Explain the following observations when burning magnesium is lowered into a gas jar of carbon(4) oxide it continues burning,but when burning zinc is lowered into a gas jar of carbon (4) oxide it does not burn.
Date posted: June 24, 2018. Answers (1)
- Which alkanol is mixed with a cleansing agent during its preparation?(Solved)
Which alkanol is mixed with a cleansing agent during its preparation?
Date posted: June 24, 2018. Answers (1)
- What is the difference between fractional distillation and fractional crystallization?(Solved)
What is the difference between fractional distillation and fractional crystallization?
Date posted: June 23, 2018. Answers (1)
- What is the difference of alkali and alkaline?(Solved)
What is the difference of alkali and alkaline?
Date posted: June 22, 2018. Answers (1)
- Factors influencing size of ionisation energy of an element (Solved)
Factors influencing size of ionisation energy of an element
Date posted: June 21, 2018. Answers (1)
- What is lampblack?(Solved)
What is lampblack?
Date posted: June 20, 2018. Answers (1)
- What mass of sodium hydroxide would be needed to neutralize exactly 200 cubic centimetre of a solution containing 49 grammes of sulphuric acid in dm-3(Solved)
What mass of sodium hydroxide would be neededto neutralize exactly 200 cubic centimetre of a solution containing 49 grammes of sulphuric acid in dm^-3
Date posted: June 18, 2018. Answers (1)
- Describe Werner's coordination theory and give his main proposals(Solved)
Describe Werner's coordination theory and give his main proposals.
Date posted: May 22, 2018. Answers (1)
- Explain Pearson's rule and Jorgen's rule as used in coordination chemistry(Solved)
Explain Pearson's rule and Jorgen's rule as used in coordination chemistry.
Date posted: May 20, 2018. Answers (1)
- What is the difference between a solvate and a hydrate.(Solved)
Organometallics
Date posted: May 20, 2018. Answers (1)
- Differentiate between the terms isomers and polymers(Solved)
Differentiate between the terms isomers and polymers.
Date posted: May 20, 2018. Answers (1)
- State the assumptions of capture recapture method of population size estimation(Solved)
State the assumptions of capture recapture method of population size estimation.
Date posted: May 19, 2018. Answers (1)
- Explain why sodium hydroxide is preferred when making a setup to investigate the active part of air using a burning candle(Solved)
Explain why sodium hydroxide is preferred when making a setup to investigate the active part of air using a burning candle.
Date posted: May 14, 2018. Answers (1)
- The Haber process largely relies on catalysts. Give reason for this.(Solved)
The Haber process largely relies on catalysts. Give reason for this.
Date posted: May 12, 2018. Answers (1)
- Name the industrial process by which ammonia gas is produced (Solved)
Name the industrial process by which ammonia gas is produced.
Date posted: May 10, 2018. Answers (1)
- Name the three oxides of nitrogen(Solved)
Name the three oxides of nitrogen.
Date posted: May 10, 2018. Answers (1)
- State the properties of nitrogen(I)oxide gas(Solved)
State the properties of nitrogen(I)oxide gas
Date posted: May 10, 2018. Answers (1)
- Describe the process of obtaining nitrogen gas from air by fractional distillation of liquid air(Solved)
Describe the process of obtaining nitrogen gas from air by fractional distillation of liquid air.
Date posted: May 10, 2018. Answers (1)
- Using chemical equations, describe the process of producing nitric acid.(Solved)
Using chemical equations, describe the process of producing nitric acid.
Date posted: May 5, 2018. Answers (1)