Reversible and Irreversible Changes

What change of state is shown in the picture?

• Solid to gas

• Solid to liquid

• Gas to liquid

• Liquid to solid

Tags

NGSS.MS-PS1-4

When the temperature drops, icicles can form. Which change of state results in the formation of icicles?

• melting

• evaporation

• freezing

• condensation

Answer explanation

The formation of icicles from water is an example of the physical change of state known as freezing. Freezing is the process by which a liquid changes into a solid when its temperature is lowered below its freezing point.

Tags

NGSS.MS-PS1-4

To make coffee, water is heated in a tea kettle. Which change of state occurs in the teakettle?

• melting

• freezing

• evaporation

• condensation

Answer explanation

Heating water in a tea kettle results in a change of state from liquid to gas or vapor called evaporation, through the process of boiling or vaporization.

Tags

NGSS.MS-PS1-4

It's time for a science joke!

See if you can answer the question:

What do solids, liquids and gases have in common?

Answer explanation

They all have mass and volume: This means that they take up space and have a certain amount of weight.

They can be measured.

Solids, liquids, and gases are all made up of tiny particles (atoms or molecules), which are in constant motion.

Tags

NGSS.5-PS1-1

 Sally works in a waste management company and her team sorts the waste into two categories.

 Mention the possible reason for sorting the waste.

Answer explanation

Overall, sorting waste is an important process that can help reduce the amount of waste that goes to landfills, conserve natural resources, and protect the environment.

Tags

NGSS.MS-ESS3-3

NGSS.MS-ETS1-1

Threat to environment:

• Plastic Waste

• Waste separation

• Reduce, Reuse and Recycle

• Stainless steel

Tags

NGSS.MS-ESS3-3

NGSS.MS-ESS3-4

Eco Friendly material:

• Plastic Waste

• Waste separation

• Reduce, Reuse and Recycle

• Stainless steel

Tags

NGSS.MS-ESS3-3

NGSS.MS-ESS3-4

NGSS.MS-PS1-3

Three R’S:

• Plastic Waste

• Waste separation

• Reduce, Reuse and Recycle

• Stainless steel

Tags

NGSS.MS-ESS3-3

NGSS.MS-ESS3-4

Biodegradable, recyclable and non recyclable:

• Plastic Waste

• Waste separation

• Reduce, Reuse and Recycle

• Stainless steel

Tags

NGSS.MS-ESS3-3

NGSS.MS-PS1-3

Imagine you are at the beach with your friends, and you notice a lot of plastic bottles and bags on the sand and in the water.

Why are these plastic bottles and bags dangerous for our environment?

Tags

NGSS.MS-ESS3-3

NGSS.MS-LS2-4