8th Grade Remediation Part 1

Which of the following is NOT a part of the Nuclear Model's view of the atom?

• Atoms are mostly empty space.

• The nucleus is in the center of the atom.

• The nucleus has a positive charge. 

• Electrons are found in a cloud around the nucleus.

Which model is represented by discovery 4?

• Billiard Ball Model

• Planetary Model

• Nuclear Model

• Plum Pudding Model

Which model correctly represents particle charges of an atom?

• 
• 
• 
• 

Using the diagram, how many neutrons would an atom of nickel contain?

• 31

• 28

• 59

• 87

What distinguishes each element from all others, and gives it unique physical and chemical properties?

• The element’s universal origin

• The number of neutrons

• The electron configuration

• The number of protons

Which physical property is related to a change in the state of matter?

• Basicity

• Combustibility

• Acidity

• Melting point

Which solutions have a density greater than 1.0 g/mL?

• Mass = 888 g Volume = 800 mL

• Mass = 7.8 g Volume = 8.7 mL

• Mass = 725 g Volume = 715 mL

• Mass = 1.3 g Volume = 1.1 mL

• Mass = 18 g Volume = 19 mL

Which student is conducting an experiment on the chemical properties of a substance?

• The melting point of silver (Ag) is measured at various elevations.

• The acidity of vinegar (C₂H₄O₂) is measured daily for five days.

• The odor of sulfur (S) is measured in different indoor environments.

• The solubility of salt (NaCl) is measured in different amounts of water.

Which of the following would be listed as physical properties of a substance?

• Melts at 150°F

• Basic

• Density

• Soluble in water

• Non-reactive to oxygen

A student added Epsom salt crystals to water in a test tube. He found that the test tube became colder. Which statement explains the reaction described?

• There is absorption of heat, so it is an exothermic reaction.

• There is release of heat, so it is an endothermic reaction.

• There is release of heat, so it is an exothermic reaction.

• There is absorption of heat, so it is an endothermic reaction.