Which is a compound?

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. Which best describes this observation?

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?

Which best describes a method of obtaining energy that may cause changes in water temperature and harm to fish populations?

Which is a nonrenewable resource?

How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary? 

Which would indicate the water in a lake is not safe for drinking? 

A geologist identifies the identical index fossils in rock layers from two different areas. Which conclusion is best supported by this discovery?

Which supports the theory that some mountains were once at the bottom of an ocean? 

Which disease is caused by a fungal infection? 

How are pandemics different than epidemics? 

Which is one possible human benefit from biotechnology research? 

How has genetic engineering helped farming? 

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? 

How are mutualism and parasitism different? 

What would have the greatest long-term impact on reducing the amount of carbon dioxide in the air? 

Which evidence supports the idea that life on Earth has continually evolved? 

Which would most likely increase the genetic variation in a population of organisms? 

Which is the primary source of energy for most cells in the body? 

Which is classified as an element? 

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

Which statement is true about a chemical reaction? 

Which are most responsible for creating acid rain pollution? 

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

How can upwellings improve fishing for ocean fishermen?

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

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

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

What is the most likely result of overusing a particular antibiotic? 

Which illness could most likely be treated with antibiotics? 

How can biotechnology help farmers overcome sudden changes in the global climate? 

How has biotechnology helped to improve the agricultural industry? 

What happens to most of the energy as it moves throughout a food web?

Which is the best evidence for evolution? 

Which best explains why mammals became dominant after the mass extinction of the dinosaurs? 

Which demonstrates how genetic variation may result from a change in the environment where an animal lives? 

Where do plants get the food they need for energy? 

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

Which is the best example of a chemical change? 

Which chemical equation best represents the Law of Conservation of Mass? 

Which is most likely a major concern associated with burning fossil fuels? 

Which action shows concern for the environment with regards to the resources of the oceans? 

What effect does the water cycle have on the total amount of water on Earth?

Which characteristic of water quality provides the most information regarding the health of a water system?

Where is most of Earth’s freshwater located? 

Which is the most accurate way of determining the age of a fossil? 

Which allows scientists to investigate what Earth’s climate was like over the past 740,000 years? 

Which best describes uniformitarianism? 

Many infectious diseases have been nearly eliminated worldwide. Why should global studies of infectious diseases continue? 

Scientists have been able to cause some bacteria to produce insulin. In which area of science would these scientists most likely work? 

If a company genetically modifies corn to produce an odor that repels insects, which best describes how the corn was modified? 

Which best represents the flow of energy within an aquatic ecosystem? 

If a bat, an alligator, and a bird evolved from a common ancestor, what most likely can be concluded? 

Recent changes in species can be found in the upper layers of rock. This provides a link between which two scientific ideas? 

Which of these would most likely happen to a species that is not able to adapt to a changing environment? 

A runner is preparing to run a long race. Which would provide the highest level of energy for the runner? 

Why are digestion and respiration important to the body?