pH-Digestion and Acid Rain

Tomato juice is an acid, therefore which of the following is a property of tomato juice?

• Turns litmus blue

• Tastes sour

• Does not react with metals

• feels slippery

2. What is the pH of the stomach?

• 2

• 4

• 7

• 8

Which is true about mechanical digestion

• Happens mostly in the small intestines

• it involves ONLY chemicals

• it happens ONLY in the stomach

• it involves ONLY breaking large pieces of food into smaller pieces

What is another name for spit?

• stomach acid

• pepsin

• adrenalin

• saliva (amylase)

Which statement is true about digestion?

• The body breaks down food only into small pieces and then stops.

• The digestive process uses chemical digestion only.

• The digestive process happens only in the stomach.

• The digestive process happens in the mouth, stomach, and the small intestines.

Ammonia is a base with a pH around 11.5. Which statement is therefore correct about ammonia? It would ..

• be sour

• feel slippery

• react with metals

• have a similar pH to the stomach.

What part of the digestive system does chemical digestion occur?

• mouth and stomach

• stomach and small intestines

• small intestines and mouth

• mouth, stomach, and small intestines

Chemical digestion...

• Breaks big pieces of food into smaller pieces of food

• Is similar to what happens when you hit a sugar cube with a hammer

• Breaks down large molecules into smaller molecules.

• Reduces the size of the food, but the food is not changed into other compounds

Tags

NGSS.MS-LS1-7

Which of the following pH values has the lowest concentration of Hydrogen (H+) ions?

• pH 1

• pH 4

• pH 7

• pH 10

What is a source of man made acid rain?

• clouds

• ozone

• burning fossil fuels

• coal that is still buried underground

Tags

NGSS.MS-ESS3-4