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Questions in chemistry

[Homework Help] What is the electron configuration of [tex]Ca^{2+}[/tex]?

[Homework Help] How was nitrogen discovered?

[Homework Help] Which of the following is the best evidence that digestion involves chemical change? A. Time is required to accomplish results. B. The products’ mass equals the reactants’ mass. C. Different compounds are involved. D. New substances are produced.

[Homework Help] Compounds have physical properties that: A. Resemble the physical properties of one of their elements. B. Differ greatly from the properties of all of their elements. C. Resemble the physical properties of all of their elements. D. Differ greatly from the properties of one of their elements.

[Homework Help] As an object’s temperature increases, the rate at which it radiates energy increases.

[Homework Help] What happens to reactant molecules when forming product molecules?

[Homework Help] Hydrogen is a nonmetal, and oxygen is a nonmetal. If these two elements were to bond, they would form a(n) _____.

[Homework Help] If a radioisotope has a half-life of 10 years, how much of the original material would remain after 40 years?

[Homework Help] What is the difference between solid HCl and liquid HCl?

[Homework Help] How many moles of calcium are in a sample of 40 g?