Explanation:
Chemical reactions occur when substances are transformed into other substances.
chemical reactions are generally categorized into four basic types:
- Combination or Synthesis- This involves the formation of a single product from two or more reactants.
- Decomposition or cracking: this is the formation of the of two or more products from a single reactant.
- Single replacement or single displacement - in this reaction type one substance is replacing another.
- Double replacement or double decomposition - involves an actual exchange of partners to form new compounds .
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The half-life of cobalt-60 is 5.26 years. After 10.52 years, 5 grams of a 20-gram sample will remain is TRUE
<u>Explanation:</u>
Mass of cobalt = 20 g
Half-life = 5.26 years
Mass remains after 10.52 years = 5 g
This can be solved by using given below formula, 
= initial mass
t = number of years from when the mass was m_0
m(t) = remaining mass after t years
Number of half-lives = 
Number of half-lives = 
Number of half-lives = 2
At time zero = 20 g
At first half-life = 
= 10 g
At second half life = 
= 5 g
The given statement is true.
The atmosphere of earth is made of five main layers.
1) Troposphere : This is the lowest part of the atmosphere. Most of the air that makes up the atmosphere is present in this layer.
2) Stratosphere : This layer is present above troposphere and extends up to 50 km. It contains ozone layer which prevents the harmful ultraviolet rays from the sun from entering the lower troposphere
3) Mesosphere : The layer above stratosphere is known as mesosphere.
4) Thermosphere : The region lies above mesosphere.
5) Exosphere : The is the outermost region of the atmosphere.
From the above discussion we can see that the layer that lies between exosphere and mesosphere is Thermosphere
Answer:
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Explanation:
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Answer:
0.120 m
Explanation:
What you need to know here is that frequency and wavelength have an inverse relationship as described by the equation
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