Question

which of these is hydrophobic? glucose k+ cl- water fat question 18 (1.7 points) an atom with an atomic number of 10 and a mass number of 24 would _______. a) 10 neutrons b) 24 protons c) 14 neutrons

Explanation:

Step1: Define hydrophobic substances

Hydrophobic substances repel water. They are non - polar.

Step2: Analyze each option

• Glucose is a polar molecule and is hydrophilic.
• $K^{+}$ and $Cl^{-}$ are ions and are hydrophilic as they can interact with water through ion - dipole interactions.
• Water is a polar molecule itself and is not hydrophobic.
• Fat is non - polar and is hydrophobic.

Step3: Recall atomic number and mass number relationship

The mass number ($A$) of an atom is the sum of the number of protons ($p$) and neutrons ($n$), i.e., $A=p + n$. Given the atomic number (number of protons) is 10 and mass number is 24.

Step4: Calculate number of neutrons

We can find the number of neutrons using the formula $n=A - p$. Substituting $A = 24$ and $p=10$, we get $n=24 - 10=14$.

Answer:

For the first question: Fat
For the second question: C. 14 neutrons