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Inorganic Chemistry
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- This graph illustratesa. that ice is less dense than waterb. that ice is more dense than waterc. why ice floats on waterd. why water molecules form hydrogen bonds with other water moleculese. both a and c are correctf. All of these are correct
- If a chemical accepted H+ from the surrounding solution, the chemical could bea. a baseb. an acidc. a bufferd. none of these are correcte. Both a and c are correct
- Which of these best describes the changes that occur when a solution goes from pH 5 to pH 8?a. The hydrogen ion concentration decreases as the solution goes from acidic to basicb. The hydrogen ion concentration increases as the solution goes from basic to acidicc. The hydrogen ion concentration decreases as the solution goes from basic to acidic
- Water flows freely, but doe not separate into individual molecules because water isa. cohesiveb. hydrophilicc. hydrophobicd. adhesive
- Rainwater has a pH of about 5.6; therefore, rainwater isa. a neutral solutionb. an acidic solutionc. a basic solutiond. It depends on whether the rainwater is buffered
- Acidsa. release hydrogen ions in solutionb. cause the pH of a solution to rise above 7c. take up sodium ions and become neutrald. increase the number of water moleculese. both a and b are correct
- Water can absorb a large amount of heat without much change in temperature, and therefore it hasa. a high surface tensionb. a high heat capacityc. ten times as many hydrogen ionsd. ten times as many hydroxide ions
- Which of these properties of water cannot be attributed to hydrogen bonding between water molecules?a. Water stabilizes temperature inside and outside the cellb. Water molecules are cohesivec. Water is a solvent for many moleculesd. Ice floats on liquid watere. both b and c are correct
- When water dissociates, it releasesa. equal amounts of H+ and OH-b. more H+ than OH-c. more OH- than H+d. only H+
- An atom that has two electrons in the outer shell, such as calcium, would most likelya. share to acquire a completed outer shellb. lose these two electrons and become a negatively charged ionc. lose these two electrons and become a positively charged iond. bind with carbon by way of hydrogen bondse. bind with another calcium atom to satisfy its energy needs
- Isotopes of the same element differ from each other only by the number of neutrons.a. Trueb. False
- The periodic table does nota. give information about the various elementsb. indicate the number of protons and the number of valence electronsc. indicate whether an element forms ionic or covalent bondsd. play a useful role in chemistry today
- The rule stating that the outer electron shell is most stable when it contains eight electrons isa. stability ruleb. atomic rulec. octet ruled. shell rule
- When an atom gains electrons, ita. forms a negatively charged ionb. forms a positively charged ionc. forms covalent bondsd. gains atomic mass
- The atomic number tells you thea. number of neutrons in the nucleusb. number of protons in the atomc. atomic mass of the atomd. number of its electrons if the atom has a neutral chargee. both b and d are correct
- How many electrons does nitrogen require to fill its outer shell?a. zerob. onec. twod. three
- Which of the subatomic particles contributes almost no weight to an atom?a. protons in the electron shellsb. electrons in the nucleusc. neutrons in the nucleusd. electrons at various energy levels
- Molecules held together by ___________ bonds tend to dissociate in biological systems due to the water content in those systems.a. covalentb. ionicc. hydrogend. nitrogen
- Which of the following is not a component of an atom?a. protonb. lectonsc. neutrond. electron
- CHNOPS area. the only atoms found in nonliving and living thingsb. the only atoms found in living thingsc. atoms basic to lifed. atoms found in rockse. both b and c are correct