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Questions in chemistry

[Answered] Which of the following is best described as a decomposition reaction? [tex]HCl + NaHCO _3 \rightarrow H _2 O + CO _2+ NaCl[/tex] [tex]2 Na + Cl _2 \rightarrow 2 NaCl[/tex] [tex]2 HgO \rightarrow 2 Hg + O _2[/tex] [tex]AgNO _3+ NaCl \rightarrow AgCl + NaNO _3[/tex]

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Who was the first chemist to organize elements by atomic number? A. Johann Wolfgang Döbereiner B. Antoine Lavoisier C. Henry Moseley D. John Newlands

[Answered] What is the correct formula for the ionic compound that would result from the combination of sodium and phosphorus? A. $Na _3 Ph$ B. $S _3 P$ C. $Na _3 P$ D. $NaP _3$

[Answered] Which statement best describes the relationship between activation energy and rate of reaction? A. Increasing the activation energy can increase the rate of a reaction. B. Reducing the activation energy can increase the rate of a reaction. C. Increasing the reaction energy does not alter the rate of reaction. D. Reducing the activation energy can decrease the rate of a reaction.

[Answered] 2Al(s) + 3Br₂(l) → 2AlBr₃(s) A. precipitation B. acid-base neutralization C. redox reaction

[Answered] The table lists the number of protons, electrons, and neutrons in a certain radioactive nuclide. Which is the symbol of this radioactive nuclide? ${ }_{11}^{24} Na$ ${ }_{11}^{22} Na$ ${ }_{11}^{13} Al$ ${ }_{13}^{24} Al

[Answered] Test your understanding of isotopes by selecting the correct relationship between the pair of atoms. Argon-40 Argon-41 A. Same Atom, Not Isotopes of Each Other B. Isotopes C. Different Element

[Answered] Rank the following solutions in order based on pH. (1 = Highest pH; 4 = Lowest pH) $0.1 M HC _2 Cl _3 O _2$ [ Choose ] $0.1 M KClO _4$ [ Choose ] $0.1 M NaClO _2$ [ Choose ] 0.1 M NaF [ Choose ]

[Answered] Select the correct answer. Which quantity is a graduated cylinder designed for measuring? A. length B. mass C. temperature D. time E. volume