Astudent had 1.00 l of a 1.00 m acid solution. much to the surprise of the student, it took 2.00 l of 1.00 m naoh solution to react completely with the acid. explain why it took twice as much naoh to react with all of the acid. in a different experiment, a student had 10.0 ml of 0.020 m hcl. again, much to the surprise of the student, it took only 5.00 ml of 0.020 m strong base to react completely with the hcl. explain why it took only half as much strong base to react with all of the hcl.

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Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base