Review part 3

Which is classified as an element?

• Carbon dioxide

• Iron

• Vinegar

• Water

Which best describes the sequence of the elements in Period 5 of the periodic table?

• Highly reactive gases, relatively nonreactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

• 1. Highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases 

• 1. Nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases.

• 1. Nonreactive gases, nonreactive metals, highly reactive metals, metalloids, reactive nonmetals, reactive gases. 

Which statement is true about a chemical reaction?

• The physical states of the atoms in the reactants determine the products

• Some of the atoms in the reactants will be a part of the products

• The number of atoms in the reactants determines the products

• All of the atoms in the reactants will be a part of the products

Which are most responsible for creating acid rain pollution?

• nuclear power plants

• coal-burning power plants

• hydroelectric power plants

• wood-burning power plants

This table shows the estimated energy production (in quadrillions of BTUs) from fossil fuels over a 20-year period. Which conclusion is best supported by the data?

• Dependency on oil has increased, therefore energy production from oil is increasing.

• Dependency on oil has increased, therefore energy production from natural is gas decreasing.

• Dependency on coal has increased, therefore energy production from coal is increasing.

• Dependency on coal has increased, therefore energy production from natural gas is decreasing.

Which best explains why all of the Earth’s freshwater is not available for human use?

• Most of earth’s freshwater is only in lakes.

• Most of Earth’s freshwater is underground.

• Most of earth’s freshwater is still in the water cycle.

• 1. Most of Earth’s freshwater is frozen water. 

How can upwellings improve fishing for ocean fishermen?

• They cause the ocean water to get warmer.

• They cause ocean currents to remain calm.

• They bring nutrients from the cold, deep ocean waters.

• They bring ocean currents from the equator.

If a lake gas excess levels of phosphates and nitrates in its water, what will most likely result?

• The temperature of the lake water will decrease.

• The turbidity levels of the lake will decrease.

• The dissolved-oxygen levels in the lake will increase.

• The growth of algae in the lake will increase.

Which is most accurate method scientists use to predict the age of Earth?

• Relative dating or rocks layers

• Radioactive dating of rocks

• Comparing the ages of different fossils

• Investigating core samples from the arctic

Which is the best reason for scientists to study ice cores obtained from earth’s ice caps?

• To evaluate potential oil drilling sites

• To study the quality of water stored in glaciers

• To determine the rate of melting in polar regions

• To study past climates by analyzing trapped gases and particles