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Questions in chemistry

[Homework Help] Nitrates and sulfates in Earth's atmosphere create A. polar melting. B. acid rain. C. the greenhouse effect. D. equilibrium clouds.

[Homework Help] Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. | molecular formula | name of compound | | :---------------- | :--------------- | | $SiO _2$ | | | $SO _3$ | | | $SO _2$ | | | SiO | | | $NH _3$ | |

[Homework Help] The overall negative charge in $TiO _2$ is -4. What is the charge of the titanium ion? A. +4 B. +2 C. -2 D. -4

[Homework Help] Deducing the unit missing from the solution to a basic quantitative problem, a student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation. [tex]\frac{(1.05 mol)\left(\frac{1 mL}{10^{-3} L}\right)}{(4.7 \square)}=2.2 \times 10^2 mL[/tex]

[Homework Help] What volume of a 5% w/v solution is required to deliver a dose of 40mg?

[Homework Help] Name the following cyclic alkanes. a. b. c. d.

[Homework Help] Which solution will change red litmus to blue? A. HCl (aq.) B. NaCl (aq.) C. CH3OH (aq.) D. NaOH(aq.) 77. Given the equation: H+ + OH- = H2O, which type of reaction does the equation represent? A. Esterification B. Decomposition C. Hydrolysis D. Neutralization 78. Which of the following elements is essential in all organic compounds? A. Nitrogen B. Hydrogen C. Oxygen D. Carbon 79. Naturally occurring polymers are A. starch and nylon B. starch and cellulose C. protein and nylon D. protein and plastic 80. Which of the following compounds is represented by the general formula CnH2n-2? A. Butane B. Butene C. Butyne D. Benzene 81. Compared to the charge and mass of a proton, an electron has A. the same charge and a smaller mass B. the same charge and the same mass C. an opposite charge and a smaller mass D. an opposite charge and the same mass

[Homework Help] An experimenter attempts to carry out a single replacement reaction between solid iodine and a solution of potassium chloride. Which is more reactive, iodine or chlorine? Which of the following equations correctly predicts the products of the reaction? i. [tex]I _2(s)+2 KCl _{( aq )} \rightarrow Cl _{2(g)}+2 KI _{( aq )}[/tex] ii. [tex]I _2(s)+ KCl _{( aq )} \rightarrow KClI _2(s)[/tex] iii. [tex]I _2(s)+2 KCl _{( aq )} \rightarrow 2 K_{( s )}+2 ClI _{( aq )}[/tex] iv. [tex]I _2(s)+ KCl ( aq ) \rightarrow[/tex] no reaction

[Homework Help] Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. | molecular formula | name of compound | | :---------------- | :--------------- | | $CO _2$ | | | $Br _2 O$ | | | CO | | | $BrO _2$ | | | $H _2 O$ | |

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