Unit 2 TEST REVIEW: Elements & Chemical Changes

Which of the following is a physical property commonly used to identify metals on the periodic table?

• Brittle texture

• High electrical conductivity

• Dull appearance

• Low melting point

Tags

TEKS.SCI.6.6C

Which of the following elements is most likely to be a good conductor of heat and electricity?

• Sulfur

• Copper

• Neon

• Phosphorus

Tags

TEKS.SCI.6.6C

Which of the following is evidence of a chemical change?

• Melting of ice

• Production of a gas

• Dissolving sugar in water

• Breaking a glass

Tags

TEKS.SCI.6.6E

A student is given four unknown elements. How could they use physical properties to classify them as metals, nonmetals, or metalloids?

• By observing their color only

• By testing conductivity, malleability, and luster

• By measuring their mass

• By checking their melting points only

Tags

TEKS.SCI.6.6C

What is a precipitate?

• A solid formed during a chemical reaction

• A liquid formed during a physical change

• A gas released during boiling

• A color change in a solution

Tags

TEKS.SCI.6.6E

A student mixes vinegar and baking soda and observes bubbling. What evidence of a chemical change is present?

• Formation of a precipitate

• Production of a gas

• Change in color

• Melting

Tags

TEKS.SCI.6.6E

Which physical property is most commonly associated with nonmetals?

• Shiny surface

• Good conductor of heat

• Poor conductor of electricity

• Malleable

Tags

TEKS.SCI.6.6C

A student heats a substance and notices it gives off heat and changes color. What does this suggest?

• Only a physical change

• A chemical change has occurred

• No change has occurred

• Only a temperature change

Tags

TEKS.SCI.6.6E

What is the importance of rare Earth elements in modern life?

• Used in making jewelry

• Essential for electronics and magnets

• Used only in food production

• Not used in modern technology

Tags

TEKS.SCI.6.6C

Which of the following changes is a chemical change?

• Freezing water

• Burning wood

• Cutting paper

• Boiling water

Tags

TEKS.SCI.6.6E