Cornell notes Properties of water 2

Label the water molecule and place the the correct charges on each end.

a

b

c

d

+

-

Oxygen

Hydrogen

Answer explanation

Water is composed of 1 oxygen atom (positively charged) and 2 hydrogen atoms (negatively charged)

Tags

NGSS.MS-PS1-1

Water, which makes up about ​ (a)   of the human body, is vital for maintaining the ​ (b)   narrow and slightly alkaline pH range of ​ (c)   . If the body's pH falls outside this range, it can be ​ (d)   because nearly all of the body's metabolic processes and ​ (e)   are extremely sensitive to pH levels and would stop working. 

• 70%
• blood's
• fatal
• enzymes
• 7.35–7.45

Tags

NGSS.HS-LS1-3

In multicellular organisms, the fluid within the cell and around the cell maintain a constant ​ (a)   .

This nearly constant pH is maintained through ​ (b)   systems.

A buffer is a solution that can ​ (c)   pH change upon the addition of an acidic or basic component.

Common buffers would be ​ (d)   ( sodium bicarbonate) and salt.

• pH
• buffer
• resist
• Baking soda

Tags

NGSS.HS-LS1-3

What could stop working which would prevent chemical reactions in our body from occurring which would wind up being fatal.

• Enzymes

• Lipids

• Nuclei

• Muscles

Tags

NGSS.HS-LS1-7

Salt and Baking soda are considered __________ because they help maintain a constant pH.

• Intensify

• Buffer

• Salient

• Alkaline

Solutions and suspensions is often found as a part of a ​ (a)   .

A mixture is a material composed of two or more elements or compounds that are ​ (b)   mixed together but not ​ (c)   combined.

• mixture
• physically
• chemically

Two types of mixtures that can be made with water are ​ (a)   and suspensions.

If a crystal of ​ (b)   is placed in a glass of warm water, sodium and chloride ​ (c)   on the surface of the crystal are attracted to ​ (d)   molecules.

water molecules pull the ​ (e)   ions apart, breaking the ionic bond that held them together.

• solutions
• table salt
• ions
• polar
• sodium and chloride

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Water dissolves salt through a process called solvation, where water molecules first pull apart the salt's sodium ions by using their opposing charges. The positive ends of water molecules (hydrogen) are attracted to the negative chloride ions, and the negative ends of water (oxygen) molecules are attracted to the positive sodium ions.

These attractions are strong enough to overcome the ionic bonds in the salt crystal, allowing the water molecules to surround and separate each ion

Match the following:

• bonds in the salt crystal

• Ion

• negative chloride atoms

• • - Oxygen attracted to

• positive sodium ions

• • + Hydrogen attracted to

Tags

NGSS.MS-PS2-5

An ionic bond forms when a metal atom transfers one or more ___________ to a nonmetal atom, creating oppositely charged ions

• Protons

• Neutrons

• Electrons

In a saltwater solution, table salt is the ​ (a)   , the substance that is dissolved, while water is the ​ (b)   , the substance in which the solute dissolves.

Water's ​ (c)   gives it the ability to dissolve both ionic compounds and other polar molecules like ​ (d)   .

• solute
• solvent
• polarity
• sugar