VG_Physical and Chemical Changes Exit Ticket #2

A student mixes two clear liquids and observes a solid forming at the bottom of the container. What is this solid called?

• Solvent

• Precipitate

• Solute

• Solution

Tags

TEKS.SCI.6.6E

A student mixes vinegar and baking soda and observes bubbling. What evidence of a chemical change is this?

• Change in color

• Production of a gas

• Formation of a precipitate

• Change in temperature

Tags

TEKS.SCI.6.6E

Why is the formation of a precipitate considered evidence of a chemical change?

• It indicates a change in temperature

• It shows that a new substance has formed

• It demonstrates a change in state

• It proves that energy has been absorbed

Tags

TEKS.SCI.6.6E

You have 2 chemicals, CHEMICAL A and CHEMICAL B. They are both liquids. When you combine them you notice some crystals starting to form within them. Did a chemical reaction occur?

• Yes

• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat.

• Chemical Change/Reaction

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change. 

• Chemical then Physical 

• Both Physical Changes

• Physical then Chemical

• Both Chemical

What is the definition of chemical change/reaction?

• Matter cannot be created or destroyed, only change form

• Changes affecting the form of a chemical substance, but not its chemical composition.

• Any change that results in the formation of one (or more) new chemical substance(s).

• Changing of only the appearance of the object

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5