7.6A Changes in Matter

Which statement about chemical and physical changes is correct?

• 1 only

• 2 only

• 2 and 3

• 4 only

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

NGSS.MS-PS1-4

Which process represents a physical change?

• Roasting a marshmallow over a campfire

• Melting chocolate in a pan on the stove

• Bubbling due to an antacid tablet in vinegar

• Bruising of a banana's skin after dropping on the floor

Granite is a hard igneous rock often used in making kitchen counter tops. It is mined at a granite quarry, where the rock is cut from Earth's crust and broken into usable pieces. What part of the digestive process is most similar to granite mining?

• The walls of the esophagus lubricate the food, helping it move to the stomach

• Teeth break food into smaller pieces

• Food mixes with digestive juices in the stomach

• Chemical digestion occurs as food moves through the small intestines

Tags

NGSS.MS-LS1-7

A child chews a cracker but does not swallow it. At first the cracker tastes salty. The child notices that as the cracker becomes mushy, it begins to taste sweet. What does the change in taste indicate?

• A chemical change takes places as the saliva breaks down the starches into simpler sugar molecules

• A physical change takes place as the saliva breaks down the sugar

• The sweet taste indicates a buildup of starch molecules

• The salty taste indicates a breakdown of sugar molecules into simpler starch molecules

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When making pancakes for breakfast, a student mixes milk and vinegar, to make buttermilk. As a result of mixing milk and vinegar, the milk curdles. What type of change in matter does milk curdling represent?

• Change in shape

• Change in state

• Chemical change

• Physical change

Which statement is an example of a physical change of matter?

• Tearing a sheet of paper into smaller pieces

• Cutting two inches of hair off

• Pruning a plant of dead leaves

• All of them

Two forms of digestion occur in the mouth. Which form is identified during the chewing process?

• Physical digestion

• Natural digestion

• Chemical digestion

• Thermal digestion

Which statement does NOT indicate a physical change?

• A student cuts open an apple and removes the core

• The apple dries out into hard, crispy pieces

• The apple appears brown in color after being cut into smaller pieces

• A student peels the apple and chops it into smaller pieces

A student was given a diagram of the digestive system and asked to identify the areas which participate in physical and chemical digestion. Which locations participate in chemical digestion?

• Locations P, Q, R, and S

• Locations P, Q, and S

• Locations P, R, and S

• Locations Q, R, and S

Which statement is NOT an example of a physical change when baking brownies?

• Cooking brownies at 400° for 45 minutes

• Stirring ingredients in bowl until smooth

• Breaking open an egg to remove the contents

• Pouring brownie batter into pan