Exploring Physical and Chemical Changes in Chemistry

Miss Watson introduces chemical reactions, explaining the difference between chemical and physical changes. She outlines indicators of chemical reactions, such as color change, gas formation, and precipitate formation. The lesson covers terminology, including reactants and products, and demonstrates how to write word and chemical equations. Students are encouraged to classify changes, identify indicators, and convert between word and chemical equations.

What is the primary difference between a chemical and a physical change?

• A physical change creates a new substance, while a chemical change does not.

• Both changes create new substances.

• Neither change creates a new substance.

• A chemical change creates a new substance, while a physical change does not.

Which of the following is an indicator of a chemical reaction?

• Change in color

• Change in shape

• Change in size

• Change in position

Tags

NGSS.MS-PS1-2

What forms when two liquids mix and create a solid during a chemical reaction?

• Suspension

• Solution

• Precipitate

• Mixture

Tags

NGSS.MS-PS1-2

Which is not a typical indicator of a chemical change?

• Sound production

• Gas formation

• Color change

• Phase change

Tags

NGSS.MS-PS1-2

What does a precipitate indicate in a chemical reaction?

• A new solid is formed from two liquids

• The temperature has increased

• The reactants have dissolved

• A gas is formed

In a chemical reaction, what term describes the substances you start with?

• Products

• Catalysts

• Compounds

• Reactants

What is the role of reactants in a chemical equation?

• They are by-products of the reaction

• They are the starting materials in the reaction

• They are used to speed up the reaction

• They are the outcome of the reaction

Tags

NGSS.MS-PS1-1

What is the correct representation of a chemical equation for the reaction of magnesium and diatomic chlorine?

• Mg2 + Cl -> MgCl2

• Mg + Cl2 -> MgCl2

• Mg + Cl2 -> MgCl

• Mg + Cl -> MgCl2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which verb could correctly fit in a word equation for a chemical reaction?

• Freezes

• Melts

• Reacts to form

• Dissolves

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What should you do if you're unable to understand the chemical equations after watching the video?

• Watch the video again or ask the teacher in class

• Ignore the confusion and move on

• Skip the quiz

• Try to guess the answers in the quiz