Chapter 7: Water the Universal Solvent Flashcards Preview

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Flashcards in Chapter 7: Water the Universal Solvent Deck (16)
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1

What is a non-polar covalent bond?

is electrically neutral since electrons are shared equally by the atoms in a molecule

2

What is a polar covalent bond?

an unequal sharing of electrons, water is a polar covalent molecule
-positive hydrogen end of water molecule is draw to the negative oxygen ends; this forms hydrogen bonds

3

What is Surface Tension?

when water is able to cling to itself as well as other surroundings
- water freezes faster than it thaws
- forms a crystalline structure in solid state

4

Atmospheric Pressure is what?

impacts the boiling and freezing points
- water boils at lower temperatures at high altitudes and at higher temperatures at lower altitudes

5

hat kind of cookies does he like?

chocolate chip cookies

6

is water usually found in its pure state?

no water is mostly found in its impure state because it is such a great solvent

7

An impurity in water can change its..?

- physical and chemical characteristics
- flavour and colour
- boiling and freezing points
- hydrogen bonding

8

Water transfers heat energy into..?

water transfers heat energy into food

9

water boils at a constant what?

water boils at a constant temperature

10

Water can be in 3 different forms, what are they?

1. Free water
2. Bound Water
3. A Hydrate

11

What is Free Water?

is easily separated from food tissue
often contains dissolved compounds, boils and freezes easily

12

What is Bound Water?

is tied to a structure of larger molecules, does not easily freeze or boil, chemically reacts as part of a larger molecule

13

What is a Hydrate?

s a compound loosely bound with water, must be boiled to be free of water, known as "anhydrous"

14

What is steam?

leaves food more flavourful and nutritious than boiling, leavens baked goods

15

What are solid-in-water solutions?

if a solid is dissolved in water, chemical properties will be different than pure water
- salt and sugar lower the freezing point and increase the boiling point of water

16

The hydrogen bond is?

an intermolecular bond between FON with hydrogen atoms