Answer the following question given this paragraph: The enthalpy of the reactants is greater than the enthalpy of the products. During the course of the reaction, heat is released to the surroundings. Q: What is released during an enthalpy reaction? Choices: - gold - precipitation - sound - heat A:
heat
Answer the following question given this paragraph: Q: What is occasional chest pain known as? Choices: - cardiac arrest - arrhythmia - heart murmur - angina pectoris A:
angina pectoris
Q: Answer the following question given this paragraph: There are 6 elements in this reaction. All of the monatomic ions have oxidation numbers equal to their charges. Additionally, we can assign an oxidation state of -2 to each oxygen atom and +1 to each hydrogen atom. Now, we just need to assign the oxidation states of manganese in MnO 4 - , nitrogen in the nitrite and nitrate ions, and sulfur in the sulfate ion. These can be determined by choosing a value for which all of the oxidation states in the ion add up to its overall charge. For example, in the nitrite ion:. Q: All of the monatomic ions have oxidation numbers equal to their? Choices: - atomic number - shape - atomic weight - charges A:
A: charges
Question: Answer the following question given this paragraph: Oceans are an important part of the water cycle. They absorb gases from the atmosphere. They evaporate and supply water vapor to the atmosphere. Q: Where do oceans absorb gases from? Choices: - stratosphere - wind - sunlight - atmosphere A:
Answer: atmosphere
*Question*
Answer the following question given this paragraph: Atoms cannot only gain extra electrons. They can also lose electrons. In either case, they become ions . Ions are atoms that have a positive or negative charge because they have unequal numbers of protons and electrons. If atoms lose electrons, they become positive ions, or cations. If atoms gain electrons, they become negative ions, or anions. Consider the example of fluorine (see Figure below ). A fluorine atom has nine protons and nine electrons, so it is electrically neutral. If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1. Q: What's the name for an atom that has gained or lost an electron? Choices: - an photon - isotope - neutrino - an ion A:
**Answer**
an ion
*Question*
Answer the following question given this paragraph: Eruptions can be explosive or non-explosive. Only rarely do gentle and explosive eruptions happen in the same volcano. Q: In what two ways are volcanic eruptions characterized? Choices: - minor and explosive - localized and general - non-explosive and serious - explosive and non-explosive A:
**Answer**
explosive and non-explosive