Polyethylene or Polythene is one of the most common plastics used all around the world. It is very widely produced, with around 80 million tonnes every single year!
It is used for the following
- Plastic bags
- Plastic films
- Geomembranes (low permeable sheets that act like a barrier or a line separating two substances to control fluids)
- Dustbin crates
- Water pipes
- Plastic bottles
- Packaging
Answer: The enthalpy change for this reaction is 392 Joules
Explanation:
The balanced chemical reaction is,
The expression for enthalpy change is,
where,
n = number of moles
Now put all the given values in this expression, we get
Therefore, the enthalpy change for this reaction is 392 Joules
Mass after 60 years:
2 kg of cesium-137 will remain after 60.0 years.
What is Half-life?
The duration needed for a quantity to decrease to half of its initial value is known as the half-life.
Given:
N0 = is the initial amount of cesium-137 = 8.0 Kg
N = is the amount remaining after a time = Unknown
t = Duration of cesium-137 decay in 8.0 Kg = 60 years
t1/2 = half-life of cesium-137 = 30.0 years
Formula = N/No = (1/2)^t/t1/2
After putting the value:
N/8= (1/2)^60/30
N/8= (1/2)^2
N/8= 1/4
4N= 8
N= 8/4
N= 2 Kg
As a result, 2 Kg of cesium-137 will be present after 60 years.
Learn more about the half-life here,
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Answer:
D. Asexual reproduction
Explanation:
In the process of asexual reproduction a new organism is produced from a single parent organism. So the new offspring inherits all the genetic traits of a single parent, there is no recombination of genetic traits. However, in sexual reproduction there is recombination of genetic traits so the offspring shows genetic variation.