CFA 4.1

What would the breaking up of a large rock into small rocks be considered?

• Physical

• chemical

• both chemical and physical

• neither chemical or physical

Which of the following is not an indicator that can be observed in a chemical reaction?

• production of a gas

• formation of a precipitate

• a solid melting to a liquid

• production of light 

Tags

NGSS.MS-PS1-2

A student places an iron nail in a test tube with water for two weeks and sketches any observations. The student concludes that the nail experiences a chemical change. Which statement or statements support the student's conclusion?  Choose 2 correct answers. 

• the nail changes shape.

• Rust forms on the nail.

• A color chnange occurs

• the state of matter of the nail changes.

Tags

NGSS.MS-PS1-2

Magnesium strips are long, thin strips that are gray and shiny. Which action will lead to a chemical
change of magnesium strips?

• putting them in the freezer 

• burning them with a candle

• cutting them into small pieces 

Tags

NGSS.MS-PS1-2

Which of these choices describes a physical property?  Choose 2 correct answers.  

• Whether or not a metal can rust.

• Magnesium metal is flammable.

• Magnesium metal is shiny or has luster.

• Water has a boiling point of 100 degrees Celsius.

Carlos is studying the chemical properties of water.  Which of these statements describes a chemical property of water?  Choose 2 correct answers.  

• Pure water is a colorless liquid. 

• Pure water can react with sodium metal. 

• Pure water has a density of 1 g/mL. 

• Pure water does not undergo combustion (burning).

Tags

NGSS.MS-PS1-2

During the Elephant Toothpaste Lab, which were indicators that the chemical reaction occurred?  

• Temperature Increase and Color change

• Temperature increase and gas production

• Formation of a precipitate and gas production

Tags

NGSS.MS-PS1-2

The candle wax melts

• Physical change

• chemical change

Tags

NGSS.4-PS3-2