semester 1 review

Which uses of iron are due to its chemical properties? Select two options.

• producing colored sparks in fireworks

• changing from liquid to gas at 2,862°C

• rusting in the presence of water and oxygen

• hanging from solid to liquid if heated to 1,538°C

• conducting electricity and heat

Which event always involves a chemical change?

• boiling

• melting

• conducting

• burning

What is the Lewis dot structure for the covalent compound sulfur dioxide?

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An unknown element was recently discovered and found to have the characteristics shown in the table. In which group does the unknown element most likely belong?

• Alkali Metals

• Alkaline Earth Metals

• Halogens

• Transition Metals

Gold is classified as a pure substance. Which of its properties supports this classification

• Gold occurs in nature as a solid.

• Gold is resistant to rust and tarnish.

• Gold has a high melting point.

• Gold is made of one kind of atom.

Use the electromagnetic spectrum to answer the next question. Which type of electromagnetic waves have the greatest energy?

• Gamma Rays

• Microwaves

• Radio Waves

• Visible Light

Matter can exist as a solid, a liquid or a gas. The solid state is distinguished by its ability to

• be easily compressible

• take the shape of a container

• have particles of low density

• maintain an ordered pattern

What is the formula of calcium permanganate?

What causes the atomic radius of the elements to decrease across Period 3 from left to right?

• The shielding effect

• The decreasing metallic character

• The increasing nuclear charge

• The increasing number of neutrons

The Electron Sea Model explains why metals

• are excellent conductors

• are very reactive

• accept electrons easily

• form ionic compounds