Chemistry
Which is a compound?
A sodium B sugar C nitrogen D air
Sugar
What happens to most of the energy as it moves throughout a food web?
It is changed into heat energy
Which best explains why mammals became dominant after the mass extinction of the dinosaurs?
They had traits that helped them adapt to environmental changes.
Which are most responsible for creating acid rain pollution?
coal-burning power plants
What is the most likely result of overusing a particular antibiotic?
more infections caused by bacteria resistant to the antibiotic
Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. What had happened to explain this observation?
Some of the atoms during the reaction escaped into the air.
How are mutualism and parasitism different?
Both organisms benefit in mutualism, while in parasitism only one organism benefits at the other’s expense.
A geologist identifies the identical index fossils in rock layers from two different areas. Which conclusion is best supported by this discovery?
The two rock layers were deposited at approximately the same time.
What effect does the water cycle have on the total amount of water on Earth?
The total amount of water on Earth remains relatively constant.
How are pandemics different than epidemics?
Pandemics affect many countries or states; an epidemic is more localized.
This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.
H2CO3 → H2O + CO2
How does the reaction support the Law of Conservation of Mass?
The mass of the atoms in the reactant equals the mass of the atoms in the products.
How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary?
The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease.
Where have we found evidence that supports the idea that life on Earth has continually evolved?
evidence from rock layers, fossils, and ice cores
Which best explains why all of the Earth’s freshwater is not available for human use?
Most of Earth’s freshwater is frozen water.
Which illness could most likely be treated with antibiotics?
influenza B common cold C strep throat D diabetes
C strep throat
Which statement is true about a chemical reaction?
All of the atoms in the reactants will be a part of the products
In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?
The deer population would increase and begin to compete for food.
Which is the most accurate method scientists use to predict the age of Earth?
radioactive dating of rocks
How can upwellings improve fishing for ocean fishermen?
They bring nutrients from the cold, deep ocean waters.
Which is the primary source of energy for most cells in the body?
Sugar
Which best describes the sequence of the elements in Period 5 of the periodic table?
highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases
Which of these would most likely happen to a species that is not able to adapt to a changing environment?
The species would become extinct over time
Recent changes in species can be found in the upper layers of rock. This provides a link between which two scientific ideas?
the theory of evolution and the Law of Superposition
Which would indicate the water in a lake is not safe for drinking?
high turbidity levels in the lake
Which is one possible human benefit from biotechnology research?
producing crops that can grow in areas where they normally do not grow