Chemistry of Materials

This is a Bohr Diagram of Aluminum. How many valence electrons does Aluminum have?

• 3

• 13

• 10

Tags

NGSS.MS-PS1-1

If you place a solid in water, you can determine:

• If the solid is more or less dense than water.

• If the solid is more or less toxic than water.

• The Flammability of the solid.

• The mass of the solid.

• 20 g/cm³

• 10 g/cm³

• 5 g/cm³

• 0.2 g/cm³

Your teacher holds up a solid and informs you that this non-malleable solid is less dense than zinc. Based on this information, the solid could be:

• Zinc

• Nickel

• Carbon

• None of the above.

Which of the following is a chemical property of a substance? The substance ____________ .

• dissolves in water (solubility)

• reacts with hydrochloric acid

• bends easily (malleable)

• is more dense than water

Which of the following is NOT a property that can be used to identify a material?

• flexibility

• color

• shape

• density

You must identify an unknown substance using only the information shown in the table. Which one of the following tests could help you narrow down the identity of the substance?

• Placing the substance in water.

• Carefully bend the substance.

• Observing that the substance is a solid.

• Carefully smelling the substance.

The wooden cube below has a mass of 9 grams. Will it float or sink in water? Explain.

A student was given a sample of one of the plastics to identify. She discovered that it was Flexible, would Float on water, and was resistant to breaking at low temperatures. What was the name of her plastic? What is your evidence?

Tags

NGSS.MS-PS1-2

Since the 1950s, when plastic use became common, about 9 billion tons of plastic have been produced. Use what you know about the structure and properties of plastics to explain why plastics have had such an impact on modern society. Include in your answer:

• what plastics are made of

• why they have become such important materials

• why many people are concerned about the increasing use of plastics

• what material do you think is a better alternative: aluminum or glass or is plastic the best?

Tags

NGSS.MS-ESS3-4

NGSS.MS-PS1-3