Answer:
Proteins folded into pleated sheets or twisted into a helix(spiral) are considered to be _secondary_ structure proteins.
Explanation:
The secondary structure is characterized by the sequence of hydrogen connections in the peptide backbone among both amino hydrogen and carboxylic oxygen atoms. The secondary structure components usually form randomly as an intermediate until the protein pleats into its 3D tertiary framework.
Freezing point depression for dilute solution can be calculated using the formula: ΔT_f = K_f · c · i where K_f = cryoscopic constant of the solvent c = molality of solution, i..e. number os moles solute per kilogram solvent i = van't Hoff factor
The cryscopic constant for the solvent water is K_f = 1.853 °C/m
Glucose has a molar mass of: M = (6·12 + 12·1 + 6·16) g/mol = 180 g/mol So you dissolved n = 15.5 g / 180 mol = 8.61×10⁻² mol Hence molaltity of solution is c = 8.61×10⁻² mol / 0.245 kg = 0.3515 m
The van' Hoff factor gives you the number of particles in solution per particle dissolved. Since glucose does not dissociate, when it is dissolved in water, the van't Hoff factor for this solution is i = 1
So the freezing point depression for this solution is: ΔT_f = 1.853 °C/m · 0.3515 m · 1 = 0.65 °C
The freezing point of the solution equals freezing point of pure solvent minus freezing point depression: T_f = T_f° - ΔT_f = 0 °C - 0.65 °C = - 0.65 °C
Answer:
The correct answer is because distilled water has a neutral pH=7.
Explanation:
Distilled water has a neutral pH of 7, which means that water is neither an acid nor a base. Vinegar is a dilute acid that can be further diluted with water, or it can be neutralized using a base. The term "pH" means "hydrogen potential", the more hydrogen-free ions in flotation in a solution, the more acidic it will be.
The pH of vinegar will always be kept at a lower than neutral number, no matter how diluted, because vinegar is an acid.
By adding distilled water (pH = 7) to the vinegar, it does not increase the amount of H+ in the solution, so it does not affect the pH of the vinegar.
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A series circuit is a closed circuit where the current follows one path. In a series circuit, the devices along the circuit loop are connected in a continuous row, so that if one device fails or is disconnected, the entire circuit is interrupted.
Isotopes are the same elements with the same number of portions but different numbers of neutrons
For instance, the element carbon exists as several isotopes, each having the exact same number of protons (otherwise, it would no longer be carbon if the # of protons changes), and a different number of neutrons