Answer the following question given this paragraph: Oxygen has an oxidation state of -2 in most of its compounds. Oxygen is the second most electronegative element, so it also tends to be assigned all shared electrons. Exceptions include O 2 (oxidation state = 0), peroxides, in which two oxygen atoms are connected by a single bond (oxidation state usually = -1), and any compound in which oxygen is bonded to fluorine (pretty rare and reactive). Q: What is the name of the second most electronegative element? Choices: - nitrogen - Hydrogen - carbon - oxygen A:
oxygen
(Question)
Answer the following question given this paragraph: Scientific investigations involve the collection of data through observation, the formation and testing of hypotheses by experimentation, and analysis of the results that involves reasoning. Scientific investigations begin with observations that lead to questions. Q: What is the initial stage of scienetific investigations? Choices: - asking questions - forming hypothesis - making predictions - observation A:
(Answer)
observation
Ques: Answer the following question given this paragraph: Many kinds of waves exist, such as sound waves and water waves. Visible light is also a wave. It is a specific type of a more general phenomenon called an electromagnetic wave. All waves can be described in terms of the basic physical properties frequency and wavelength . These two properties are related to the speed of a wave by the following equation:. Q: What type of wave is visible light? Choices: - static - radio - acoustic - electromagnetic A:
Ans: electromagnetic
(Q).
Answer the following question given this paragraph: Enzymes are proteins that increase the rate of biochemical reactions. Enzymes aren't changed or used up in the reactions, so they can be used to speed up the same reaction over and over again. Enzymes are highly specific for certain chemical reactions, so they are very effective. A reaction that would take years to occur without its enzyme might occur in a split second with the enzyme. Q: What are proteins that increase the rate of biochemical reactions? Choices: - metabolites - hormones - amino acids - enzymes A:
(A).
enzymes
Ques:Answer the following question given this paragraph: Ecosystems require constant inputs of energy from sunlight or chemicals. Producers use energy and inorganic molecules to make food. Consumers take in food by eating producers or other living things. Decomposers break down dead organisms and other organic wastes and release inorganic molecules back to the environment. Q: What do decomposers release once they have broken down the dead organisms? Choices: - essential molecules - unusable molecules - organic molecules - inorganic molecules A:

Ans:inorganic molecules
Question: Answer the following question given this paragraph: In alpha decay, energy and an alpha particle are emitted by a nucleus that is unstable because it has too many protons. An alpha particle consists of two protons and two neutrons, so it is actually a helium nucleus. Q: What is an alpha particle with two protons and two neutrons called? Choices: - chloride nucleus - hydrogen nucleus - hydrogen nucleus - helium nucleus A:
Answer:
helium nucleus