Formation of a New Substance

If we have any substance, it can be concluded that a chemical change has happened if –

• There's a color change

• The state of matter changes

• There is a decrease in mass

• The matter is stirred thoroughly

Tags

NGSS.MS-PS1-2

Which of the following situations provides evidence that a chemical change has taken place?

• Water, when boiled, evaporates and turns into vapor.

• Sugar, when added to iced tea, dissolves into the liquid.

• Two liquids are mixed, and a new solid substance (a precipitate) forms.

• A piece of paper is cut into many small pieces.

Tags

NGSS.MS-PS1-2

Which of the following would indicate the formation of a new substance?

• A liquid turns to a solid

• A sample of metal melts

• Bubbles and fizzing occur

• A solid dissolves in a liquid

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student notices that sugar, when heated over a flame, turns black. How does the student know that a new substance is being formed?

• The temperature of the sugar increases.

• The color of the sugar changes to black.

• Sugar began to melt within the test tube.

• Sugar started as white crystals.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Spoiling food is an example of:

• chemical change

• physical change

• no change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is an example of a different substance being formed?

• glass breaking

• metal melting

• water freezing

• wood burning

Tags

NGSS.MS-PS1-2

Ice melting

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-4

• Physical Change
• Chemical Change

Tags

NGSS.MS-PS1-2

What kind of change is a melting popsicle?

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What kind of change is cutting your hair?

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