7th Grade Unit 2 Assessment

Food goes through physical and chemical changes as it passes through the first part of the digestive system. Which of the following best describes these changes?

• Physical changes include chewing, while chemical changes involve enzymes breaking down food.

• Physical changes include swallowing, while chemical changes involve the movement of food through the esophagus.

• Physical changes include the absorption of nutrients, while chemical changes involve the mixing of food with saliva.

• Physical changes include the production of saliva, while chemical changes involve the movement of food to the stomach.

Which step in the digestive process represents a chemical change in food?

• Storing of swallowed food in the stomach

• Churning of food, liquids, and digestive juices in the stomach

• Movement of food down the esophagus to the stomach

• Substances in the mouth and stomach breaking down fats and proteins

Tags

NGSS.MS-PS1-2

Which of the following examples includes only chemical changes that occur in the digestive process?

• Absorption of nutrients by villi in the small intestines

• Chewing and swallowing food

• Recycling of water from dissolved food back into the body

• Reaction of saliva, stomach acid, bile, and pancreatic juices with food

Tags

NGSS.MS-PS1-2

Which of the digestive processes below will be found in the middle section of the Venn diagram showing both chemical and physical changes?

• Chewing and mixing of food with saliva

• Movement of food through peristalsis

• Reaction of food with hydrochloric acid

• Interaction of food with bile

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the digestive processes below will be found in the chemical change section of the Venn diagram shown above?

• II only

• II, III, IV

• III, IV

• IV only

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A series of physical and chemical changes occur during the process of digestion. Which of the following processes best describes a physical change that occurs during digestion?

• Stomach acid breaks down proteins

• Bile breaks down fat

• Saliva breaking down large molecules into smaller molecules

• Chewing food to break down large pieces so they can be swallowed

What is an example of a physical change that occurs during digestion?

• Digestive enzymes in the stomach break down proteins into amino acids.

• Saliva in the mouth converts starches into simple sugars.

• Pancreatic enzymes break down fats into fatty acids.

• Teeth grind and tear food into smaller pieces in the mouth.

What types of changes occur during the erosion and deposition of sediments in a river?

• The erosion and deposition of sediment are physical changes.

• The erosion and deposition of sediment are chemical changes.

• The erosion of sediment is a chemical change, and the deposition of sediment is a physical change.

• The erosion of sediment is a physical change, and the deposition of sediment is a chemical change.

Tags

NGSS.MS-ESS2-2

Human activity causes changes to the groundwater and surface water in a watershed. Which change to groundwater or surface water is classified as a chemical change?

• Concrete streets and parking lots cause more water to remain surface water instead of absorbing into the ground to become groundwater.

• Hydroelectric dams built on rivers create lakes upstream of the dams and variable flow downstream.

• Industrial waste that is dumped in a river causes acidic conditions that cause damage to fish digestive systems.

• Rainwater collects in drainage ditches and flows to nearby lakes, increasing the water volume in lakes.

Tags

NGSS.MS-PS1-2

A student mixes 20 grams of sugar into 100 milliliters of water. In this solution, sugar is the _________. After adding 50 more milliliters of water, the solution becomes _________. Blank 1:

• solute

• solvent

• solution

• mixture