Percentage recovery gives us an idea of the amount of pure substance recovered after the chemical reaction. Percentage recovery can be more than 100 % or less than 100 %. Usually, in any experiment performed the weight percentage recovery will be less than 100. Percent recovery values greater than 100 show that the recovered compound is contaminated.
Amount of acetaminophen initially taken = 350 mg
Amount of acetaminophen obtained after recovery =185 mg
= 
= 52.9%
Answer:
Protective fruit
Explanation:
Angiosperm seeds grow in the middle of flower's ovaries and are covered by a defensive fruit.
Materials<span> and their </span>properties<span>: </span>compounds like<span> sodium chloride - an interactive educational resource for 11 to 14 year olds. ... Elements are substances (</span>like<span> hydrogen and oxygen) that can't be split into simpler substances. ... For </span>each<span> statement, decide whether it describes a mixture or a </span>compound<span> and check the box.</span>
<span>it located along mid-ocean ridges where </span>tectonic<span> plates spread apart, magma rises and cools to form new crust and </span>volcanic<span> mountain chains. </span><span>.</span>
Answer : The correct Lewis-dot structure of nitrate ion is shown below and the nitrogen has 4 covalent bonds.
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule. The number of valance electrons are shown by 'dot'.
The given molecule is, nitrate ion
As we know that nitrogen has '5' valence electrons and oxygen has '6' valence electron.
Therefore, the total number of valence electrons in 
= 5 + 3(6) + 1 = 24 electrons
According to Lewis-dot structure, there are 8 number of bonding electrons and 16 number of non-bonding electrons.
The correct Lewis-dot structure of nitrate ion is shown below.
