8th Grade Science EOG Review

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

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

Which best explains why the total mass of the products would be less than the total weight of the reactants after a chemical reaction?

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

Which would least likely have an impact on global climate changes?

• producing energy using  hydroelectric plants
• producing energy using coal
• producing energy using oil
• producing energy using natural gas

Which is an example of a renewable energy resource?

• biomass
• coal
• gas
• oil

Which will most likely result if there is increased upwelling in a coastal area?

• more aquatic life
• less nutrients in the water
• higher water temperatures
• fewer nitrates

Which best determines the health of a lake used as a source of freshwater?

• its depth and width
• its temperature and pH
• its location and depth
• its temperature and depth

A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?

• the birds living in the area of the bones
• the weather conditions in the area of the bones
• the kinds of trees living in the area of the bones
• the index fossils in the area of the bones

Which best describes how ice cores are important to the study of geologic history?

• They show unconformities, which signal changes in deposition.
• They hold index fossils, which are used to date the different ice cores.
• They contain evidence showing changes in the atmospheric composition over time.
• They follow the Law of Superposition, which gives reasons for extinctions of species.

Why do doctors suggest that people get a flu vaccine each year

• Viruses replicate more rapidly over time.
• Viruses can mutate from year to year.
• Vaccines are absorbed by the body after a year.
• Vaccines get stronger over time.