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Questions in chemistry

[Terjawab] Which of the following PPE is recommended when mixing copper sulfate solution for a reference electrode? A. Rubber boots B. Safety vest C. Rubber gloves or chemical gloves D. Insulated leather gloves

[Terjawab] Use this isotope to answer the following questions: ${}_{82}^{208} Pb$ How many protons does lead-208 have?

[Terjawab] Write a synthesis reaction for the production of triglycerides. Explain the relationship of water to this reaction. Why is the reverse of this reaction important?

[Terjawab] Which compound contains only a nonpolar covalent molecule? $O _2$ HCl $H _2 O$ $NO _3$

[Terjawab] 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]

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

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

[Terjawab] 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. $NaP _3$

[Terjawab] 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.

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