what is the definition of chemical change?

any change that results in the formation of new chemical substances.

matter cannot be created or destroyed, only change form

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

Which of the following describes a precipitate?

a solid forms when one liquid is poured into another

a liquid forms when a block of metal is heated

a gas forms when a solid is placed in a liquid

bubbles form when an acid is poured on a rock

Which process is an example of a purely physical change?

Carrots are cut into small pieces and mixed into a salad.

A peanut butter sandwich is eaten and broken down by enzymes in the stomach.

Sodium metal and chlorine gas are combined to form sodium chloride, or table salt.

Sodium metal and water are combined to form a basic compound and a flammable gas.

There are several differences between chemical and purely physical changes. Which process is an example of a chemical change?

a metal railing rusting in damp weather

steam rising from a boiling pot of soup

alcohol evaporating from a cotton swab

a piece of wood shrinking as it dries out

When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?

Some of the products of the reaction were given off as a gas.

The ash has less volume than the paper.

Some of the matter is destroyed during the reaction.

The mass of the ash cannot be accurately determined.

Which process represents a chemical change?

Vinegar bubbles when baking soda is added.

Which process represents a chemical change?

A metal bar is rolled into a flat sheet.

Sand, water, and salt combine to form a mixture.

Trini adds 10 g of baking soda to 100 g of vinegar. The mixture begins to bubble. When the bubbling stops, Trini finds the mass of the resulting mixture. She determines its mass is 105 g. Why has the mass changed?

A gas has formed and left the mixture.

Vinegar evaporated during the experiment.

Mixtures always are less massive than their parts.

Mass was destroyed when vinegar reacted with baking soda.

Physical and Chemical Changes

Chemistry

6th - 8th Grade

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

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

change in shape

melting

formation of a gas

dissolving

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Is hammering wood together to build a house a chemical or physical change?

chemical

physical

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Is melting butter for popcorn a chemical or physical change?

chemical

physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Is bleaching your hair a physical or chemical change?

physical

chemical

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Is burning wood a chemical or physical change?

chemical

physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

A change in the size, shape, or state of matter.

chemical change

physical change

chemical reaction

electron change

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is NOT an example of a physical change?

crumpled paper

pencil sharpening

shrunken clothing

sour milk

Tags

NGSS.MS-PS1-2

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Physical and Chemical Changes

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

Is hammering wood together to build a house a chemical or physical change?

Is melting butter for popcorn a chemical or physical change?

Is bleaching your hair a physical or chemical change?

Is burning wood a chemical or physical change?

A change in the size, shape, or state of matter.

Which of the following is NOT an example of a physical change?

Kim puts an ice cube in a beaker and it melts. This is a good example of:

Photosynthesis is an example of a

When you break a cracker into pieces it is a

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