STAAR Review Warm-Up 7.6CChanges/6.6C Metal ,Nonmetal ,Metalloid

Matter can undergo physical or chemical changes. Which of these are examples of physical changes?

Select TWO correct answers.

• Burning wood

• Breaking an egg

• Cooking an egg

• Freezing a popsicle

• Rusting iron

Which process describes only a physical change?

• Process 1

• Process 2

• Process 3

• Process 4

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

• Hydrochloric acid in the stomach breaks down protein.

• Chewing in the mouth breaks food into small pieces.

• Enzymes in saliva start the digestion of starches before food is swallowed.

• Bacteria in the intestines covert dietary fiber into fats.

Identify each sample as metal, nonmetal, or metalloid

• Sample 1: Metalloid, Sample 2: Nonmetal, Samples 3, 4, 5: Metals

• Sample 1: Metalloid, Sample 2 & 3: Nonmetals, Sample 4 &5: Metals

• Sample 1 &4: Metalloid, Sample 2 & 3: Nonmetal, Sample 5: Metals

• Sample 1 & 5: Metalloid, Sample 2 & 4: Nonmetal, Sample 3: Metals

Based on these properties, which element is most likely a nonmteal?

• Element 1

• Element 2

• Element 3

• Element 4

Which statements correctly compare metals and nonmetals?

• Metals tend to be good conductors of thermal energy.

  Nonmetals tend to be good insulators of thermal energy.

• Metals are dull and brittle.

  Nonmetals are shiny and malleable.

• Metals are good insulators of electricity.

  Nonmetals then to be good conductors of electricity.

• Metals cannot be stretched into thin wires.

  Nonmetals can be stretched into thin wires.

A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?

• Does the material feel rough or smooth?

• Will the material float in water?

• Does the material feel hard to the touch?

• Is the material malleable or ductile?