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Learn this one too. For H enthalpy , learn what the signs mean! Exothermic negative sign, heat is released , endothermic positive, heat consumed…colder.
This is a lot of information for a very small part of the exam. Explanation: The other answers are at least plausible as represents the atomic mass of silver and 68 represents the difference between atomic number and atomic mass the number of neutrons. There IS isotopic variation in most atoms, but that doesn't change the atomic number number of protons.
Temperature needs to be expressed in Kelvin, not C. Volume needs to be expressed in L, not mL. Only d uses the correct units for all variables. Explanation: While two answers represent calcium phosphate, only one has the correct ratio of these ions.
Explanation: Any thermochemical process that releases heat to the surroundings as this one does is exothermic and the calculation for the DHrxn would then be negative. Explanation: Periodic trends in the acidity of binary hydride compounds increase as you go from the top to the bottom of a group on the periodic table. Al Na None of the above - they all have the same second ionization energy Mg.
Explanation: Why? The second ionization of sodium requires the removal of a core electron. Core electrons require significantly more energy to remove than valence electrons.
The electrons removed from Mg and Al are only valence electrons. Si atomic number 14 P atomic number 15 Cl atomic number 17 Ar atomic number The lowest atomic number corresponds to the fewest number of protons in the nucleus. This result is counterintuitive—most people think that atoms get larger as the atomic number increases.
Explanation: The structure of a diamond is an interconnected network of carbon atoms covalently bound to four other carbon atoms. To form four bonds, a carbon atom has to hybridize four atomic orbitals. Vaporization Freezing Sublimation Condensation. Explanation: There are six changes in phases of matter solid to liquid, solid to gas, liquid to gas and the reverse processes. The London dispersion forces between helium atoms are greater than the London dispersion forces between Xenon molecules.
Helium forms highly polar molecules As the molecular weight of the noble gas increases, the freezing point decreases. The London dispersion forces between helium atoms are less than the London dispersion forces of the Xenon molecules. Some of these are pretest questions that will not be scored.
Any time spent on tutorials and providing personal information is in addition to the actual testing time. Questions on the Chemistry examination require candidates to demonstrate one or more of the following abilities. The subject matter of the Chemistry examination is drawn from the following topics. The percentages next to the main topics indicate the approximate percentage of exam questions on that topic. Some experiments are based on laboratory experiments widely performed in general chemistry and ask about the equipment used, observations made, calculations performed, and interpretation of the results.
The questions are designed to provide a measure of understanding of the basic tools of chemistry and their applications to simple chemical systems. Most textbooks used in college-level chemistry courses cover the topics in the outline given earlier, but the approaches to certain topics and the emphases given to them may differ. To prepare for the Chemistry exam, it is advisable to study one or more college textbooks, which can be found in most college bookstores.
When selecting a textbook, check the table of contents against the knowledge and skills required for this test. A survey conducted by CLEP found that the following textbooks are among those used by college faculty who teach the equivalent course. The questions are designed to provide a measure of understanding of the basic tools of chemistry and their applications to simple chemical systems.
Note: Each institution reserves the right to set its own credit-granting policy, which may differ from the American Council on Education ACE. Contact your college to find out the score required for credit and the number of credit hours granted. The Chemistry exam covers material that is usually taught in a one-year general chemistry course. This study guide provides practice questions for all 34 CLEP exams.
The ideal resource for taking more than one exam. Offered only by College Board. Details about the exam breakdown, credit recommendations, and free sample questions. Guide to understanding how CLEP scores are calculated and credit-granting recommendations for all exams.
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