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Questions in chemistry

[Free] The change in state from liquid to solid is called a.) freezing b.) condensation c.) melting d.) sublimation

[Free] What word describes a liquid that is resistant to flow (e.g., it does not pour easily)? A. surface tension B. viscous C. cohesive D. adhesive

[Free] Explain why an object in space may remain in motion at a constant velocity.

[Free] Title: $CH -01-12$ Based on its formula, sugar $C _6 H _{12} O _6$ is an example of what? a. an element b. a compound c. a homogeneous mixture d. a heterogeneous mixture

[Free] Which component is transferred between substances in an oxidation-reduction reaction? A. electrons B. energy C. oxygen D. protons

[Free] Which is a characteristic of mixtures? A. They have fixed ratios between their components. B. They can be classified as pure substances. C. They can be separated by physical processes. D. They are chemically bonded together.

[Free] Use the table on the right to calculate each required quantity. Remember: [tex]$q=n \Delta H$[/tex] The quantity of heat required to melt 175 g Cu is $\square$ kJ . The substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is $\square$ . | Substance | [tex]$\Delta H_{\text {fus }}$[/tex] ( [tex]$kJ / mol$[/tex] ) | [tex]$\Delta H_{\text {vap }}$[/tex] ( [tex]$kJ / mol$[/tex] ) | | --------- | --------------------------------- | --------------------------------- | | [tex]$H _2 O$[/tex] | 6.01 | 40.7 | | [tex]$CO _2$[/tex] | 7.94 | 25.2 | | [tex]$O _2$[/tex] | 0.443 | 6.81 | | [tex]$N _2$[/tex] | 0.719 | 5.58 | | Fe | 14.9 | 354 | | Al | 10.7 | 255 | | Cu | 13.0 | 304 | | NaCl | 30.2 | 171 | | [tex]$CH _4$[/tex] | 0.936 | 8.53 | | [tex]$H _2 S$[/tex] | 2.37 | 18.7 |

[Free] In a chemical reaction, substance A transfers electrons to substance B. Which statement is correct? A. Substance A is reduced and acts as the reducing agent. B. Substance B is reduced and acts as the oxidizing agent. C. Substance A is oxidized and acts as the oxidizing agent. D. Substance B is oxidized and acts as the reducing agent.

[Free] Which best defines partial pressure in a mixture of gases? A. pressure that is exerted by all the gases of a mixture on the container B. pressure that is exerted by one gas as if it occupied a container by itself C. half of the pressure that is exerted by the gases of a mixture on the container D. sum of the individual pressures that are exerted by two or more gases

[Free] A sodium hydroxide solution has a density of 1.110 g/mL, and the solution mass is 2281 g. What is the volume of the solution? Report your answer in SI units with the correct number of significant units (4 sig figs in this case). Include the units in your answer.