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Questions in chemistry

[Answered] Spend about 10 minutes on this activity. Electrolysis can be used to purify impure copper. 1. State the: a) name of the electrolyte used b) type of substance used as the cathode c) type of substance used as the anode d) electrode on which the pure copper deposits e) observations made at both electrodes. 2. State the names of the products formed at the cathode during the electrolysis of copper sulfate using carbon electrodes.

[Answered] Which statement best describes why specific heat capacity is often more useful than heat capacity for scientists when comparing two materials? A. Specific heat capacity is an intensive property and does not depend on sample size. B. Specific heat capacity is an extensive property and does not depend on sample size. C. Specific heat capacity is an intensive property and depends on the sample size. D. Specific heat capacity is an extensive property and depend on the sample size.

[Answered] Define the following terms: (a) Oxidation (b) Corrosion (c) Combustion (d) Aerobic respiration (e) Fuel Explain why combustion reactions are exothermic. Compare complete and incomplete combustion.

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

[Answered] Which of the following best represents a double replacement reaction? A. A + B --> A + B B. A + B --> AB C. A + BC --> AC + B D. AC + BD --> AD + BC

[Answered] A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correct symbol for this nuclide? A. ${}_{80}^{27} Co$ B. ${}_{60}^{33} Co$ C. ${}_{33}^{60} Co$ D. ${}_{27}^{60} Co$

[Answered] Is magnesium a metal or a nonmetal? How many valence electrons does a magnesium atom have?

[Answered] $Ca(OH)_2(aq) + 2HNO_3(aq) \rightarrow 2H_2O(l) + Ca(NO_3)_2(aq)$ Is this reaction a: A. precipitation B. acid-base neutralization C. redox reaction

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

[Answered] When 40.0 mL of $1.00 M H _2 SO _4$ is added to 80.0 mL of 1.00 M NaOH at $20.00^{\circ} C$ in a coffee cup calorimeter, the temperature of the aqueous solution increases to $29.20^{\circ} C$. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is $4.184 J / g \cdot{ }^{\circ} C$, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.) Use $q=m C_p \Delta T$. A. 4.62 kJ B. 10.0 kJ C. 14.7 kJ D. 38.5 kJ