Cumulative Exam — Cumulative exam Answers

What is produced when calcium reacts with fluorine in a synthesis reaction?Ca + F2 ________

Which is an example of a chemical change?

There are several ways to model a compound. One type of model is shown.

In an investigation, the atoms of a certain substance lose energy during a change of state. Before the change, the atoms are far apart and move constantly at high speeds and in all directions. After the change, the atoms are close together but are able to slide past one another.Use the diagram that shows changes of state between solid, liquid, and gas to answer the question.

The diagram below shows the energy conversions of the Krebs cycle, which is part of cellular respiration. The U-shaped arrows that show changes for NAD+, FAD, and ADP molecules represent energy conversions. From each glucose molecule, two acetyl-CoA molecules are made for the Krebs cycle.How many energy conversions occur when both acetyl-CoA molecules go through the Krebs cycle?

Read the passage.In Federal Drug Administration clinical trials, people who added a particular drug to diet and exercise were able to lose weight, as well as lower their blood pressure. This drug was evaluated in two clinical studies involving overweight adults with high blood pressure. The results of the trials showed that 48 percent of people taking this drug lost some of their body weight. The other group in this trial consisted of people who were not taking this medicine, and only 23 percent of them lost some weight.

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled.

How does Bohr’s model of the atom compare with Thomson’s model?

The diagram illustrates the water cycle.

Which has most likely been peer reviewed?

Jeanine wants to perform an experiment on a group of teenagers involving an experimental new drug. She is not granted permission to conduct her study.What is most likely the problem that Jeanine is having with performing her experiment?

Carlos is making phosphorus trichloride using the equation below. 2P +3Cl2 _PCl3What coefficient of PCl3 would show that the law of the conservation of mass is represented in the chemical equation?

Which is most likely an example of pseudoscience?

The volume of a gas decreases from 15.7 m3 to 11.2 m3 while the pressure changes from 1.12 atm to 1.67 atm. If the initial temperature is 245 K, what is the final temperature of the gas?

Which type of reaction is C12H22O11 → 12C + 11H2O?

Chang makes the diagram below to compare Gay-Lussac’s law and Charles’s law.

Many scientists are concerned that the Ogallala aquifer in the United States is being depleted at an alarming rate. What would most likely be a major effect of this aquifer running dry?

When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.

Covalent bonds tend to make atoms more stable by helping them

Zora takes notes in class as shown below.Positive Convenience Increased multitasking Increased efficiency Negative Expense May cause cancer May lead to decreased exercise