Physical Chemical Change

Chemical changes show the following--choose the MOST COMPLETE ANSWER.

• Form a new substance, cannot be reversed, mass of the object will decrease.

• Form a new substance, cannot be reversed, mass of the object will decrease, energy change will be large.

• Form a new substance, cannot be reversed, mass of the object will increase, energy change will be small.

• Form a new substance, cannot be reversed, mass of the object will decrease, energy change will be small.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are all the ways a physical change can occur?

• Freezing, steam, evaporation, change shape, bending, crushing, chopping, melting, drying clothes, eating metal

• A New Substance forms

• Mass decreases, new substance formed, chopping, evaporating

• None of these show evidence of a physical change

Which choice shows evidence of a chemical change occuring?

• Mass is decreased, chopping

• Mass is decreased, new substance formed, large expenditure of energy, irreversible, gas bubbles, color change, smell.

• Chopping, evaporating, cutting, crunching, bending, tearing, freezing, melting, steam rising.

• None of these show evidence of Chemical Changes

Tags

NGSS.MS-PS1-2

What does chopping, melting, crushing, breaking glass, ripping up paper and getting paper or clothing wet mean?

• Chemical changes

• Chemical and physical changes

• Physical changes only

• Both the first and the second answer are correct.

A solid brown metal is added to a clear acidic solution. A white powder appears and the acid solution becomes cloudy. Which type(s) of change have/has occurred?

• both chemical and physical

• only physical

•  neither chemical nor physical

• only chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a physical change?

•  Iron is oxidized to iron oxide

• Aluminum metal is pounded into thin sheets

• Copper reacts with a strong acid

• Sodium metal explodes on contact with water

Which of the following is a common sign that a chemical change has occurred?

• A chemical has changed size.

• A chemical has changed to a different state (solid, liquid or gas)

• A chemical has become a different shape.

• A chemical has turned a different color.

Tags

NGSS.MS-PS1-2

When silver metal comes in contact with sulfur, silver sulfide forms and the silver appears darker. This is a...

•  change of form

• chemical change

•  change of state

• physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Two solutions are added together and the new solution becomes hot. This tells you that

• a gas is being produced.

• the solutions are not soluble. 

• the physical properties are the same.

• a chemical change is taking place.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Jolene wants to experiment with sugar cubes. Which of the following causes a sugar cube to only change physically, not chemically?

• burning the sugar cube with a match

• crushing the sugar cube and dissolving it in water

• dehydrating the sugar cube with sulfuric acid

• chewing the sugar cube and digesting it