When you mix salad oil and water they immediately separate because:

Hydrogen bonds reform between water molecules

It depends on what kind of oil you are using

As water freezes, it expands and its density decreases.

As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

If you put a drop of dishwashing liquid on your finger and then dip it into the pepper and water the pepper will rush to the outer edges of the dish. Why does this happen?

When you add detergent to water the surface tension of the water is lowered, so the water flattens out and the pepper is carried to the edges with it.

the pepper will not interact with soap, so rushes away.

the cleaning powers of soap are 'cleaning' the water

Water is polar because...

The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.

The molecule has two poles, at which the it is colder than other regions of the molecule.

The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.

Why does water move from the roots to the leaves of plants?

Capillary action pulls the water molecules like a chain

Water’s cohesion causes it to “pull” towards the leaves

A water strider can skate along the top of a pond because:

hydrogen bonds result in water cohesion (surface tension)

covalent bonds result in water cohesion

water striders have adapted to take advantage of water cohesion

Chapter 15 Water Properties Chemistry

Authored by Charles Martinez

Biology

KG - University

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule

polar molecule

solution

adhesion

hydrogen bond

Tags

NGSS.MS-ESS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

tendency of molecules of the same kind to stick to one another

cohesion

adhesion

solution

polar molecule

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

molecule in which opposite ends have opposite electric charges

cohesion

polar molecule

hydrogen bond

solution

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

measure of the average energy of random motion of particles in a substance

solution

cohesion

solvent

temperature

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

uniform mixture of two or more substances

solvent

acid

solution

base

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

substance in a solution that dissolves the other substance and is present in the greater amount

solvent

solute

solution

acid

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

substance in a solution that is dissolved and is present in a lesser amount

base

solution

solvent

solute

Tags

NGSS.MS-PS1-2

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Chapter 15 Water Properties Chemistry

bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule

tendency of molecules of the same kind to stick to one another

molecule in which opposite ends have opposite electric charges

measure of the average energy of random motion of particles in a substance

uniform mixture of two or more substances

substance in a solution that dissolves the other substance and is present in the greater amount

substance in a solution that is dissolved and is present in a lesser amount

compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale

compound that removes H+ ions from an aqueous solution and that measures more than 7 on the pH scale

carbon-based molecule

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