Which of the following statements describes the conductivity of elements 3 and 4?

• Both elements are good insulators.

• Both elements are good conductors.

• Element 3 is a good conductor and element 4 is a good insulator.

• Element 3 is a good insulator and element 4 is a good conductor.

Which of the following statements about helium, neon, and argon is true?

• They have the same number of protons.

• They have the same number of neutrons.

• They are solids at a temperature of 25 °C.

• They react with other substances in a similar way.

Which of the following events is an example of a chemical change?

• Liquid nitrogen evaporates

• A candle burns

• Water boils

• Ice melts

Which of the following substances is a solution?

• Acid rain

• Table salt

• Helium gas

• Baking soda

The information in the table shows that the metal that reacts most readily with hydrochloric acid is

• 1

• 2

• 3

• 4

Which student most likely produced a new chemical substance?

• Student 1

• Student 2

• Student 3

• Student 4

The number of electrons in one beryllium atom is

• 9

• 5

• 4

• 2

Which of the following pairs of elements have the most properties in common?

• Fluorine and oxygen

• Fluorine and chlorine

• Sodium and neon

• Sodium and magnesium

Which of the following statements describes a physical property of a substance?

• Hydrochloric acid produces heat when mixed with zinc.

• Phosphorous burns when exposed to air.

• Lithium reacts violently with water.

• Copper conducts electricity.

Rutherford used the solar system as a model to explain the structure of an atom. When this model is compared to an atom, the planets represent the

• protons

• nucleus

• neutrons

• electrons