Chemical and Physical Changes in the Digestive System

You eat a hamburger from McDonald's from lunch and 20 piece chicken nuggets. Which of the following steps causes a chemical change in the digestion of the food?

• Your esophagus transports the food from your mouth to your stomach

• Your teeth grind down the food into small pieces

• Your stomach acids break down large food molecules into smaller food molecules.

• Your large intestine absorbs water that the food had

Tags

NGSS.MS-LS1-7

Which of the following is an example of a chemical change in digestion?

• Enzymes in saliva breaking down food

• Teeth grinding down a burger

• Large intestine absorbing water

• Peristalsis pushing food in the esophagus

Tags

NGSS.MS-PS1-2

Which of the following examples model physical change during digestion?

• Burning toast

• Freezing pickle juice to create a Popsicle

• Grinding food in a blender

• Cooking an egg with oil

Would the action churning in the stomach be considered a physical or chemical change?

• Physical change

• Chemical change

What kind of digestion breaks food down using chemicals?

• chemical digestion

• mechanical digestion

• enzyme

• mouth

Point to the two organs where most chemical digestion takes place.

Chemicals produced by the body that break down food into very small pieces.

• Mechanical digestion

• Indigestion

• Chemical digestion

• Photosynthesis

breaking down food with enzymes

• chemical digestion

• esophagus

• peristalsis

Enzymes and acids are examples of 

• mechanical digestion

• chemical digestion

Tags

NGSS.MS-LS1-7

In which part of the digestive system does chemical digestion begin?

• Mouth

• Stomach

• Small intestine

• Large intestine

Answer explanation

Chemical digestion begins in the mouth where enzymes like amylase start breaking down carbohydrates.