Praxis II (5435) - General Science: Content Knowledge Exam Questions With 100% Correct Answers

Praxis II (5435) - General Science: Content Knowledge Exam Questions With 100% Correct Answers Which of the following is a source of nonrenewable energy? - answerCoal Which of the following describes the process skill of concluding? - answerMaking a determination based on the results of a controlled experiment A chemistry experiment is performed to determine the effect of a nonvolatile solute on the boiling point of water. Three trials are performed in which 10 mg, 20 mg and 30 mg of salt are added to 500 ml of distilled water. Each solution is heated on a hot plate, and the elevated boiling points are recorded. Which of the following correctly identifies the independent and dependent variables. - answerThe independent variable is he amount of salt, and the dependent variable is the temperature at which the water boils. Which of the following is NOT true concerning forming and testing hypotheses? - answerA good hypothesis will not be disproved by testing. Which of the following is the correct expression of 0.0034050 in scientific notation? - answer3.4050 x 10(-3) Which of the following numbers has 4 significant figures? - answer0.003020 What is the correct expression of 91,000 x 87,000 using scientific notation and significant figures? - answer7.9 x 10(9) Students experimentally determine that the specific heat of copper is 0.410 L/gC. If the known value of the specific heat of copper is 0.385 j/gC, what is the percent error? - answer6.49% Two balances in a classroom laboratory are used to determine the mass of an object. The actual mass of the object is 15.374 grams. Which of the following statements is true concerning the accuracy and precision of these two balances? - answerThe digital balance is both more accurate and more precise. Which of the following subskills best fits the process skill of observing? - answerUsing the five senses to collect evidence and write descriptions. Which of the following sets of quantities are equivalent? - answer2,310 mg and 2.310 g Which of the following best describes the relationship of this set of data? - answerLow positive correlation Which of the following is NOT true concerning correlation? - answerCorrelation can show cause and effect. Which of the following is NOT a recommended storage practice for laboratory chemicals? - answerChemicals may be routinely stored on bench tops. Which of the following is the best prediction for solubility at 150 degrees Celsius? - answer130 g KBr per 100 g H2O Which of the following conclusions can be drawn from the data presented in the graph below? - answerIncreasing the solute decreases the vapor pressure and increases he boiling point of this solution. What are pure substances that consist of more than one type of atom? - answerCompounds Which of the following statements concerning the states of matter is NOT true? - answerLiquids have no definite shape and no definite volume. The smbol for a calcium ion is Ca(2+). Which of the following statements is true concerning this ion? - answerThis cation has fewer electrons than protons. Which of the following subatomic particles has the smallest mass? - answerElectrons A uranium isotope is represented by the symbol (238/92) U. How many neutrons does an atom of this isotope contain? - answer146 Which of the following represents an alpha particle? - answer4/2He(2+) Which of the following is an example of a chemical change? - answerSilver tarnishing Which temperature scales have exactly 100 degrees between the freezing point and the boiling point of water? - answerCelsius and Kelvin Which is an example of convection as a method of heat transfer? - answerA person warming his hands by washing with hot water. The energy flow through an ecosystem is represented by an energy pyramid. In the energy pyramid for a terrestrial ecosystem, the producers utilize 6,000 kilocalories per square meter per year. What approximate amount of energy is transferred to the third trophic level of this ecosystem? - answer60 kilocalories per square meter per year Which of the following general statements concerning ideal gases is true? - answerVolume is inversely proportional to pressure