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How does the picture relate to the particles in a solid?

• The cars are driving fast and switching lanes like the particles in a solid.

• The cars are sliding past each other while driving the speed limit like the particles in a solid.

• The cars are moving so fast you cannot even see them like the particles in a solid.

• The cars are barely moving like the particles in a solid.

Human blood has a pH range from 7.34-7.45. Is human blood considered acid, basic, or neutral?

• acidic 

• basic

• neutral

• between acidic and basic

Tags

NGSS.MS-PS1-2

Human blood looks like a single substance but it actually consist many different substances and particles like white blood cells, red blood cells, plasma, and platelets (help blood to clot), etc. All of these things are visible when blood is put under a microscope. Doctors can even separate the blood from the plasma by placing it in a centrifuge which spins the blood around and uses a force to cause separation. According to this evidence, human blood could be considered:

• A solution 

• A suspension

• A colloid

• A compound

Which of these common substances is a pure substance?

• Muddy water

• Table salt

• Whole milk

• Maple syrup

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

Andrea makes a sugar solution, as shown. How much water did she dissolve in the sugar in?

• 9g

• 11g

• 56g

• 67g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mrs. Winston decides to do a demonstration for her class with a piece of chalk. Using a balance, Mrs. Winston discovers that the mass of the chalk is 20 g. She then takes the piece of chalk and crushes into a fine powder. The cumulative mass of the fine powder is 20 g. What has Mrs. Winston demonstrated for her class?

• a chemical change involving change of shape and size of matter

• a chemical change involving change of mass

• a physical change involving change of shape and size of matter

• a physical change involving change of mass

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

• 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