Released: Phys Sci EOG

Which is the best example of a pure substance?

• Peantus
• Milk
• Gold
• Air

Which is classified as an element?

• Carbon dioxide
• Iron
• Vinegar
• Water

Which is a compound?

• Sodium
• Sugar
• Nitrogen
• Air

Which pair of elements has the most similar properties?

• Li and B
• I and Ca
• K and He
• N and P

Which statement best explains how periods on the periodic table are organized?

• Increasing atomic number from left to right
• Increasing number of neutrons from left to right
• Decreasing number of electrons from left to right
• Decreasing atomic mass number from left to right

Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?

• Group 1
• Group 2
• Group 16
• Group 18

Which show one example of a physical change and one example of a chemical change?

• Boiling water and melting wax
• Rusting iron and baking a cake
• Freezing water and burning coal
• Dissolving powder and shredding paper

An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

• The molecules will begin to move faster.
• The molecules will begin to move slower.
• The molecules will begin to increase in density.
• The molecules will begin to condense in the air.

Which happens to water molecules during the boiling process?

• They move faster and move farther apart as they lose heat.
• They move faster and move farther apart as they absorb heat.
• They move faster and remain close together as they absorb heat.
• They move more slowly but move further apart as they lose heat.

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

• A physical change occurred.
• Gases were released to the atmosphere.
• Atoms involved in the reaction lost mass.
• Precipitates were created in the new solution.