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Which model above represents the attractive forces in a liquid?

• Model 3 represents a liquid because the particles are hardly affected by the attractive forces.

• Model 2 represents a liquid because the attractive forces keep the particles vibrating in place

• Model 1 represents a liquid because the particles are locked in their positions because of the attractive forces.

• Model 2 represents a liquid because the attractive forces keep the particles close together but still allow movement.

Which model above represents the attractive forces in a solid?

• Model 3 represents a solid because the particles are hardly affected by the attractive forces.

• Model 1 represents a solid because the attractive forces keep the particles vibrating in place.

• Model 1 represents a solid because the particles are locked in their positions because of the attractive forces.

• Model 2 represents a solid because the attractive forces keep the particles close together but still allow movement.

Which model above represents the attractive forces in a gas?

• Model 3 represents a gas because the particles are hardly affected by the attractive forces.

• Model 2 represents a gas because the attractive forces keep the particles vibrating in place.

• Model 1 represents a gas because the particles are locked in their positions because of the attractive forces.

• Model 3 represents a gas because the attractive forces keep the particles close together but still allow movement.

Tags

NGSS.MS-PS2-5

Which statement below best describes the movement of particles in a liquid?

• The particles do not move

• The particles move freely

• The particles vibrate in a fixed position

• The particles slide easily past one another

Tags

NGSS.MS-PS1-4

Which statement below best describes the movement of particles in a solid?

• The particles do not move

• The particles move freely

• The particles vibrate in a fixed position

• The particles slide easily past one another

Why does liquid water take the shape of the cup it is poured in to, but solid ice cubes do not?

• Because the particles of liquid water are softer than particles of solid ice

• Because the particles of liquid water are smaller than the particles of solid ice

• Because the particles of liquid water are moving but the particles of solid ice are not

• Because the particles of liquid water can easily move past one another but the particles of solid ice cannot

Tags

NGSS.MS-PS1-4

Why is the formation of rust considered a chemical change?

• Rust is more reactive than oxygen

• Rust has the same chemical composition as iron

• Rust has a lower density than iron

• Rust has properties that are different from iron and oxygen

Tags

NGSS.MS-PS1-2

Lena is making a cake to share with her family. She combines the ingredients for the cake, then pours the batter into two pans and bakes the cake for 45 minutes in the oven. What type of change is mixing a cake?

• Mixing a cake is a physical change, because it can be reversed

• Mixing a cake is a chemical change, because you combine chemicals

• Mixing a cake is a chemical change, because it becomes a different substance

• Mixing a cake is a physical change, because the ingredients are the same they are just combined together

Lena is making a cake to share with her family. She combines the ingredients for the cake, then pours the batter into two pans and bakes the cake for 45 minutes in the oven. What type of change is baking a cake?

• Baking a cake is a physical change, because it can be reversed

• Baking a cake is a chemical change, because you combine chemicals

• Baking a cake is a chemical change, because it becomes a different substance

• Baking a cake is a physical change, because the ingredients are the same they are just combined together

Tags

NGSS.MS-PS1-2

Which process is an example of a physical change?

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

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

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

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