Physical and Chemical Changes

The reason for a physical change to be named as such is that the:

• change occurs only in physical properties

• transfer of energy takes place

• is a reversible change

• All of the above

When ice is heated, it changes to water and water on further heating gets converted to steam. What happens when steam is condensed?

• New substance is formed

• No new substance is formed

• Gaseous phase changes to liquid phase

• Both (b) and (c) are correct

Which is the best method to prevent rusting?

• Painting

• Greasing

• Galvanization

• Precipitation

Wood that is burning in a brush pile has heat, and produces ashes.

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is milk going sour a physical or chemical change?

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

Is freezing juice a physical or chemical change?

• Physical Change
• Chemical Change

Tags

NGSS.MS-PS1-2

Why is this a physical change?

• The shape of the clay has been changed.
• The clay can be put back into a ball shape instead of a birthday cake.
• The clays has not changed chemically.
• All are true

Tags

NGSS.5-PS1-4

A __________ is a mixture that is formed when a solid is dissolved in a liquid.

• Chemical compound
• Solution
• Endothermic reaction
• Exothermic reaction

In which of these do particles move slowest?

• matter
• gas
• liquid
• solid

Tags

NGSS.MS-PS1-4

An example of a physical property would be?

• Rust on a nail
• Salt dissolved in water.
• Wood burning
• An egg frying