Basic chemistry, water as a solvent: Biscuits n gravy

Which of the following is the weakest of bonds?

• Hydrogen bonds
• Polar covalent bonds
• Nonpolar covalent bonds
• Ionic bonds

With a water activity of .99, what could one say about the perishability of milk?

• Milk is highly perishable due to a high water activity
• Milk is somewhat perishable due to middling water activity
• Milk is not very perishable due to a low water activity

Which macromolecule, when heated in the presence of water, is able to form a paste? (Check notes on heat & food production for this one)

• Protein
• Carbohydrate
• Lipid
• Vitamins

After you add the milk, is this a physical or chemical change?

• Physical
• Chemical

Milk would be considered which of the following?

• Pure substance
• Organic compound
• Homogenous mixture
• Heterogenous mixture

In the context of milk, what role does water play?

• Solvent
• Solute

Water's ability to dissolve a variety of substances that have electrical charges is largely due to which molecular factor?

• Polar covalent bonds
• Nonpolar covalent bonds
• Van der Waals forces

In the context of gravy, what role does the flour play?

• Solute
• Solvent