Answer: M-18
Explanation:
The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large __M-18___ peaks.
Mass spectroscopy is used to determine the molecular mass and molecular formula of a sample.
When the mass spectra of alcohols do not show detectable M peaks, they show relatively large M-18 peaks.
The second one is, "<span>Be careful to present only objective facts"</span>
Answer:
Explanation:
From the given information:
The accuracy depends on the internal diameter of the cylinder. The cylinder with the least internal diameter is obviously more precise.
Let's assume 1% is the error of measurement.
Then, to measure 70 mL from 10 mL cylinder
The error = 
= 0.7 mL
However; for a 100 mL cylinder, the error = 1 mL
Now,
The total volume for 10 mL = (70 + 0.7) = 70.7 mL
The total volume for 100 mL = (70 + 1 ) = 71 mL
Suppose the density (d) is same for both
Then;
the mass of 10 mL = ( d × 70.7) g
the mass pf 100 mL = (d × 71) g
Thus, the mass of 100 mL is greater than that of 10 mL.
You would use a stopwatch. Hope this helps :D
Answer:
DNA, the proteins in hair, rubber car tires.
Step-by-step explanation:
<em>Polymers</em> are large molecules consisting of long chains of small repeating units.
DNA is a natural polymer that consists of hundreds of millions of repeating units called <em>nucleotides</em><em>.</em>
Hair protein consists of long chains of <em>amino acid</em> repeating units.
The rubber in car tires is a mixture of natural and synthetic rubber. Natural rubber consists of long chains of <em>isoprene repeating units</em>. In one type of synthetic rubber, the repeating units are <em>butadiene and styrene molecules</em>.
The <em>glass in a bottle</em> is not an organic polymer. However, some chemists consider it to be a highly cross-linked inorganic polymer of SiO₂.
<em>Ice crystals</em> are not even inorganic polymers, because the water molecules are held together only by hydrogen bonds, not covalent bonds.
