Glycine is the simplest amino acid there is. Its structural formula is shown in the attached picture. Amino acids are characterized with having an amine group and a carboxylic group at both ends of the terminals. Carboxylic acid is acidic so it has a partial negative charge on one side. Amines are basic so it has a partially positive charge on the other side. Possessing this property of having opposite charges at once is called a zwitterion. That is what is meant by the pKa values. These are the pH values of the individual functional groups. The pKa 2.34 is for the carboxylic group while pKa 9.6 is for the amine group.
These electrostatic attractions depend on the pH of the solution. At pH 12, the functional group that predominates is the carboxylic group with an overall charge of -1 as shown in the second picture.
Answer:
A. 2 NH3
Explanation:
3 H2 + N2 --> 2 NH3
On the left hand side of the equation, there are 6 hydrogen atoms and 2 nitrogen atoms. On the right hand side of the equation, there are 6 hydrogen atoms and 2 nitrogen atoms. They are both equal so the equation is balanced.
a is the answer hope this helps
A physical change.
Physical change = can be reverted + doesn't change substance
Chemical = changes substance
Answer:
Explanation:
Assume the chemical equation:
- Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)
<u>1. Convert 112 liters of hydrogen gas at STP to number of moles.</u>
You can use the molar volume of a gas at STP equal to approximately 22.4 liters.
<u>2. Use the theoretical mole ratio</u>
From the balanced chemical equation, 1 mol of Zn produced 1 mol of H₂(g).
Thus, the mole ratio is 1 : 1, and 5 moles of Zn are needed to produce 5 moles of H₂(g).
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<u>3. Convert 5 moles of Zn to mass in grams</u>
- mass in grams = number of moles × atomic mass
- mass = 5 mol × 65.39g/mol = 326.95 g
Round to 3 significant figures: 327g