Sc 8 P 9 2

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

At room temperature, water is a liquid and oxygen is a gas. How do the particles of liquid water compare to the particles of gaseous oxygen?

• The attractions between the particles are weaker in the liquid water

• The attractions between the particles are stronger in the liquid water

• There is no attraction between particles in the liquid water

• The particles are moving more freely in the liquid water

Tags

NGSS.MS-PS1-4

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

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

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

Hannah wants to make some toast for breakfast, but she has 3 minutes before she has to leave for school. She knows toasting bread is a chemical change so what is the best way for Hannah to increase the rate of this chemical change?

• change the type of bread she uses

• change the size of bread she uses

• increase the temperature of the toaster oven

• decrease the temperature of the toaster oven

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Marissa blows up balloons for a party. She decides how big or small to make each balloon. Why does the air she blows into each balloon take up all the space inside the balloon?

• The particles of air move around and slide past one another and take the shape of the balloon

• The particles of air move freely, colliding with each other and the sides of the balloon

• The particles of air move and increase in size when they have more space in the balloon

• The particles of air have a strong attraction between each other and the balloon