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Questions in chemistry

[Homework Help] Which equation represents sublimation? 1) [tex]Hg_{(l)} \to Hg_{(s)}[/tex] 2) [tex]NH_{3(g)} \to NH_{3(l)}[/tex] 3) [tex]H_2O_{(s)} \to H_2O_{(g)}[/tex] 4) [tex]CH_{4(l)} \to CH_{4(g)}[/tex]

[Homework Help] In which type of chemical reaction are electrons transferred? 1. Organic addition 2. Oxidation-reduction 3. Double replacement 4. Acid-base neutralization

[Homework Help] Which choice below would affect the rate of reaction in the opposite way from the other four? a. Cool the reaction down b. Add a catalyst c. Decrease the pressure d. Use larger pieces of solid reactants e. Decrease the concentration of the reactants

[Homework Help] Salt and sugar do not appear to have a fixed shape. Why do we call them solids?

[Homework Help] Why does copper have a high melting point?

[Homework Help] This is responsible for the relatively high boiling point of water: a. hydrogen bonding b. ionic bonding c. metallic bonding d. nonpolar covalent bonding e. polar covalent bonding

[Homework Help] Who was the first scientist to discover crystals?

[Homework Help] The oxygen saturation of a lake is found by dividing the amount of dissolved oxygen the lake water currently has per liter by the dissolved oxygen capacity per liter of the water, and then converting that number into a percent. If the lake currently has 7.4 milligrams of dissolved oxygen per liter of water and the dissolved oxygen capacity is 9.4 milligrams per liter, what is the oxygen saturation level of the lake, to the nearest percent?

[Homework Help] In which country was the first crystal discovered?

[Homework Help] Describe the process that ice on Mount Everest goes through when being heated from 10 degrees Fahrenheit to 305 Kelvin. Then, explain how the energy requirements change at different steps of the heating curve. What are the energy transfers that happen in the ice on Mount Everest?