HW 9 - New Substance

Which best explains what happens to the inside of an egg when it is boiled?

• The liquid becomes a solid. 
• The solid becomes a gas.
• The solid becomes a liquid.
• The liquid becomes a gas.

When water freezes, a physical change has occurred. Which is most likely a property of the material formed by this physical change?

• It will never become liquid again. 
• It will be in the form of a gas.
• It can be changed back into its original form.
• It can take the form of any container it is put in. 

What happens to sugar when it is mixed with water and heated to make syrup?

• It melts.
• It dissolves.
• It evaporates.
• It condenses. 

The first step in the water cycle is evaporation. What gives water the energy to evaporate?

• sun
• wind
• clouds
• waves

Tyanna lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?

• chemical

• electrical

• thermal

• physical

Which best explains why burning leaves is a chemical change?

• The leaves emit light during the change. 
• The temperature of the leaves increases.
• The shape of the leaves changes.
• The leaves turn to ashes.

Eric left an ice cube on his kitchen counter. An hour later, Eric observed that the ice cube melted. Which statement best describes this change?

• Ice melting is a physical change because a new substance is created.

• Ice melting is a chemical change because a new substance is created.

• Ice melting is a chemical change because it may be reversed.

• Ice melting is a physical change because it may be reversed.

Which describes a chemical change?

• sugar dissolving in tea
• sunshine warming a sidewalk
• scissors cutting paper into pieces
• acid in the stomach digesting food

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Jazlyn took a 1 ounce slice of bread and cut it into 2 pieces. On one side, she put 2 ounces of peanut butter. On the other side she put 1 ounce of jelly. Which will most likely be the weight of the finished sandwich?

• 7 ounces

• 3 ounces

• 6 ounces

• 4 ounces

A piece of wood is sawed into several small pieces. This is an example of what kind of change? 

• physical
• chemical
• electrical
• mechanical