Answer:
D. They are made of repeating subunits.
Explanation:
The first column represting polymers such as DNA, cellulose, nylon, hair are labelled with cells, plant material, synthetic material, animal material and They are made of repeating subunits.
<u>Not all the entries in the first column come from living things as nylon comes from synthetic material (man-made). But all four (DNA, cellulose, nylon, hair) are conists of repeating unit. </u>
DNA made up of nucleotides, cellulose is made up of rpeating units of monomer glucose, nylone is made of repeating unit of two monomers hexamethylene diamine and adipic acid, and hair is made of repeating unit of protein called keratin.
Hence, the correct answer is "D. They are made of repeating subunits."
Answer:
strength and vitality required for sustained physical or mental activity
Explanation:
The molar volume of a gas at STP occupies <u>22.4 L.</u>
Option D
<u>Explanation:</u>
To find the volume of 1 mole of a gas at STP, we use the Ideal Gas Law. It is the general gas equation which gives the relation to the measurable quantities to an ideal gas as below,
P (pressure) × V (volume) = n (number of moles) × R (the gas constant) × T (temperature in Kelvin)
STP = 1 atm of pressure and 273 K for temperature
P = 1 atm
V = ?
n = 1 mole
R = 0.0821 atm L/mol K
T = 273 K
Using the equation,
![\mathrm{PV}=\mathrm{nRT}](https://tex.z-dn.net/?f=%5Cmathrm%7BPV%7D%3D%5Cmathrm%7BnRT%7D)
![V=\frac{n R T}{P}](https://tex.z-dn.net/?f=V%3D%5Cfrac%7Bn%20R%20T%7D%7BP%7D)
By substituting the above values, in the equation,
![V=\frac{1 \times 0.082 \times 273}{1}=22.38\ L](https://tex.z-dn.net/?f=V%3D%5Cfrac%7B1%20%5Ctimes%200.082%20%5Ctimes%20273%7D%7B1%7D%3D22.38%5C%20L)
V = 22.38 L
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. ... Both oxygen and moisture are catalysts for rusting.