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PHY 123 (Food, Fire and Physiscs)- Exam #1
Questions from the study Guide
15
Physics
Undergraduate 4
02/23/2017

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Cards

Term
What are the four Basic Food Molecules?
Definition
Water, Fats, Carbohydrates, and Proteins
Term

What makes a water molecule polar?

(Hint: Elsa was polar what kind of end did it make the movie have?)

Definition
A water molecule being polar means that its electrically unsymmetrical and it has a positive and a negative end.
Term
What is a hydrogen bond?
Definition
A hydrogen bond is a bond that brings two molecules closter to each other and holds them to each other
Term
What happens when a substance dissolves in water?
Definition
Water Molecules are attracted to the Polar Regions in carbohydrates and proteins. The molecules cluster around these substances and effectively surround the larger molecules and separate them from each other. If they cluster around the molecules affectively in a cloud of water molecules, the substance dissolves.
Term
Why do bottles of beer that are put into a freezer for a quick chill and are forgotten pop open?
Definition
Because water expands when it freezes
Term
 Why are animal tissues and raw plants damaged when frozen? 
Definition

The solid water, however the molecular packing is dictated by the requirement for even distribution of hydrogen bonds. The result is a solid with more space between molecules than the liquid has, by a factor of about an eleventh.

Term

Why do liquids leak out of plants when they are thawed?

Definition

During freezing, the expanding ice crystals rupture cell membranes and walls, which then lose internal fluids when the crystals melt.

Term
What is a specific heat?
Definition
The amount of energy required to raise its (water) tempreture by a given amount. And it is high for water
Term
What does ‘latent heat of vaporization’ mean? 
Definition

Latent heat of vaporization is the amount of energy that water absorbs without a rise in temperature as it changes from a liquid to a gas. 

Term

How latent vaporization connected to steaming vegetables?

Definition

When we steam vegetables the evaporation removes energy from food and its surroundings and causes it to cook more gently. 

Term

What taste sensation do we identify with proton concentration?

Definition
Sourness
Term
Fats and oils are members of a large chemical family called what?
Definition
Lipids
Term

Why can’t lipids dissolve in water?

Definition
Because they are a hydrophobic or water fearing substance
Term

As a whole, are hydrocarbon chains that make up lipids polar or nonpolar?

Definition
Non-Polar
Term
What type of bond forms between long lipid chains?
Definition
Van Der Waals
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