Ques:Answer the following question given this paragraph: The most useful quantity for counting particles is the mole. So if each coefficient is multiplied by a mole, the balanced chemical equation tells us that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. This is the conventional way to interpret any balanced chemical equation. Q: What is the most useful quantity for counting particles? Choices: - the coefficient - the periodic table - the vector - the mole A:

Ans:the mole
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Ques:Answer the following question given this paragraph: Many alcohols are made by the hydration of alkenes. Q: The hydration of what is what makes many alcohols? Choices: - lipids - malts - enzymes - alkenes A:

Ans:alkenes
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Ques:Answer the following question given this paragraph: A neutron is a particle in the nucleus of an atom that has no electric charge. Atoms of an element often have the same number of neutrons as protons. For example, most carbon atoms have six neutrons as well as six protons. This is also shown in Figure below . Q: Carbon atoms have six neutrons as well as how many protons? Choices: - ten - two - four - six A:

Ans:six
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Ques:Answer the following question given this paragraph: A: Another example of matter changing color is a penny changing from reddish brown to greenish brown as it becomes tarnished. The color change indicates that a new chemical substance has been produced. Copper on the surface of the penny has combined with oxygen in the air to produce a different substance called copper oxide. Q: What substance is created when a copper turns from reddish brown to greenish brown? Choices: - rust - copper alloy - iron oxide - copper oxide A:

Ans:
copper oxide
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