Crime Buster Powders

This powder is white and bubbles violently when added to HCI. What is the identity of the powder?

• Vitamin C

• Baking Soda

• Calcium Carbonate

• Gypsum

Tags

NGSS.MS-PS1-2

This powder is insoluble in water and produces a terrible smell when Iodine is added. What is the identity of the powder?

• Sodium Acetate

• Salt

• Sugar

• Sand

Tags

NGSS.MS-PS1-2

The powder has a PH of 6 in water, and quickly hardens into a single piece. What is the identity of the powder?

• Gypsum

• Powdered gelatin

• Yeast

• Flour

Tags

NGSS.MS-PS1-2

The powder is formed in grains and has a pH of 2 when dissolved in water. What is the identity of the powder?

• Gypsum

• Vitamin C

• Alka-Seltzer

• Sugar

Tags

NGSS.MS-PS1-2

The powder, when added to water, first violently fizzes before stopping to give a cloudy white solution. When drained, there is a hard solid residue observed. The mixture blackens iodine as well, and has no discernable grains anywhere in the mixture. Lastly, the powder is all white. What are the identities of all three powders in this mixture?

• Sodium Acetate, Yeast, and Calcium Carbonate

• Cornstarch, Alka-Seltzer, and Gypsum

Tags

NGSS.MS-PS1-2

The powder becomes a hard solid in water, does not clear iodine, and has a pH of 6 in water. Moreover, there are grain like crystals but none are square-like. What are the identities of the two powders in this mixture?

• Vitamin C and Sugar

• Alka-Seltzer and Vitamin C

• Sugar and Powdered Gelatin

• Salt and Alka-Seltzer

Tags

NGSS.MS-PS1-2

The powder fizzes when added to water to give a completely clear solution. The powder is composed of square-like grains and a white powder. The final pH when added to water is 8. What are the identities of the two powders in this mixture?

• Sand and Powdered Gelatin

• Sodium Bicarbonate and Salt

• Vitamin C and Sodium Acetate

Tags

NGSS.MS-PS1-2

When Cornstarch in water is heated, the resultant mixture thickens. Are there more or less free water molecules (able to freely move around) in solution?

• Less

• More

• More Information is Needed

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the color of yeast pellets?

• White

• Red

• Yellow

• Tan

What is the molecular formula for cornstarch? Use CxHyOz, where x y and z are the number of carbon, hydrogen, and oxygen atoms respectively.

• C27H48O20

• C20H27O27

Tags

NGSS.MS-PS1-1