Answer:
The correct choice is: option A.
Justification:
To address this inquiry, we need to evaluate the total number of electrons each orbital can accommodate.
Orbital Number of electrons
s 2
p 6
d 10
f 14
Provided options:
A. 1s² 2s² 2p⁶ 3s² This configuration is valid as it aligns with the permitted number of electrons in each orbital and follows the correct sequence.
B. 1s² 2s² 2p⁶ 3s² 3d⁴ This configuration is not accurate because
3d⁴ should follow 3p.
C. 1s² 2s² 2d¹⁰ 2p³ This is incorrect since 2d¹⁰ is not a valid orbital.
D. 1s² 2s^s 2p³ 2d¹⁰ This option contains two errors; s as an exponent does not exist, and 2d¹⁰ is also an invalid description.
Chromatography is the method recommended for separating the two amino acids, glycine and alanine.
Answer:
Yes, the food can be served.
Explanation:
The food's serving temperature is at 146°F
- Per FDA (U.S. Food and Drug Administration) guidelines, hot foods must remain at an internal temperature of 140°F or above.
- This temperature is essential to keep bacteria at bay and prevent food spoilage.
- Dishes involving eggs, like quiches and soufflés, should be served at a minimum temperature of 165°F
<pSince the serving temperature of 146°F exceeds 140°F (the minimum required), the food is safe to serve.
Answer:
D
Explanation:
By analyzing the Lewis structures for the molecules, we can formulate their condensed structural formulas.
In the first molecule, the carbon atoms are connected by single bonds, whereas the second contains a double bond, and the third features a triple bond.
This leads us to categorize them as alkanes, alkenes, and alkynes.
Among these, alkynes exhibit the strongest bonds, thus they have the most forceful connections present.
Given that the third molecule is classified as an alkyne, we conclude that it possesses the strongest bonds.
Answer:
2.68 g
Explanation:
Given:
Volume of gas at STP = 2.15 L
Unknown:
Mass of nitrogen (N₂) gas at STP
Solution:
We will apply the mole concept to find the mass:
Step 1: Calculate moles of nitrogen gas at STP:
Number of moles = 
Note: 1 L = 1 dm³
Step 2: Use moles and molar mass to find mass:
Mass = moles × molar mass
Calculations:
1. Number of moles of N₂ = 
Number of moles of N₂ = 0.096 mole
2. Given atomic mass of N = 14 g
Molar mass of N₂ = 2 × 14 = 28 g/mol
Mass = 0.096 mol × 28 g/mol = 2.68 g
