Water, pH and Macromolecules

Examine the results (color change) of the pH paper shown in the picture.  What type of substance was tested?

• an acid
• a base
• a neutral substance
• none of the above

Where on the pH scale would you find a strong acid?

• 0-3
• 4-6
• 8-10
• 11-14

What is the pH of a neutral substance?

• 3
• 7
• 10
• 14

Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.

• lower
• higher
• the same
• none of the above

The element _______is found in all of the organic compounds.

• Iron
• Nitrogen
• Carbon
• Oxygen

Tags

NGSS.MS-PS1-1

Waxes, oils and fats are examples of

• Carbohydrates
• Lipids
• Proteins
• Nucleic Acids

Which macromolecule is shown?
 View Figure 1 (if not visible)

• lipid
• protein
• nucleic acid
• carbohydrate

Tags

NGSS.MS-LS1-7

Lipids are made of... 

• C H O
• C H O N
• C H O N P
• C H O N S

Tags

NGSS.MS-PS1-1

Carbohydrates are made of... 

• C H O
• C H O N
• C H O N P
• C H O N S

Tags

NGSS.HS-LS1-6

Why does ice float?

• 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.

Tags

NGSS.MS-PS1-4