Gizmo Questions and Answers Already Graded A

Gizmo Questions and Answers Already Graded A The four rows of data below show the boiling points for a solution with no solute, sucrose (C12 H22 O11) sodium chloride (NaCl), and calcium chloride (CaCl2) (not in that order). Which boiling point corresponds to calcium chloride? 101.53 degrees C which of the following solutions will have the lowest freezing point? 1.0 mol/kg sodium phosphide (Na3P) Which of the following compounds will be most effective in melting the ice on the rods when the air temperature is below zero? All will be equally effective Four different solutions have the following vapor pressure at 100 degrees C. Which solution will have the greatest boiling point? 96.3 kPa four different solutions have the following boiling point. which boiling point corresponds to a solution with the lowest freezing point? 108.1 degrees C Based on the diagram below, rank three objects from least dense to most dense. object X, object Y, object Z fill in the blank: an object is most likely to sink in water if? it has a high density A ball has a mass of 33.6 grams and a volume of 14.0 cubic centimeters (cc). What is its density? 2.4g/cc Three balls were measured and placed in a liquid. Based on the following data, what could be the density of the liquid? 0.9 g/mL "That's just the tip of the iceberg" is a popular expression you may have heard. It means that what you can see is only a small part of the overall problem. As the diagram shows, most of an iceberg is actually out of sight, below the water level. Based on this diagram, what is the most likely density of the iceberg? (Assume a density of 1.03 g/mL for seawater.) 0.88 g/cc Place these unknown pH test papers in order form most acidic to most alkaline. D,C,A,B A new mild dish detergent is being tested before putting it on the market. If the new detergent were tested with 0-14 pH test paper, the test strip would most likely turn what color? 8.2 Chemicals in the air can combine with rain to produce acid rain, which is harmful to the environment. Which of these is most likely to be the pH of acid rain? 4 Based on the materials measured in the Gizmo, what is the most likely pH of apple juice? 3.9 Suppose you have already compared the pH values of two substances using 0-14 paper. When would a follow-up test using 4.5-7.5 paper be most helpful? when both substances had a pH value of about 6 on the 0-14 paper The temperature of four ponds was measured at 6:00 AM. Which of the ponds would probably have the highest dissolved oxygen concentration? Pond A At what time of day are dissolved oxygen levels most likely to be highest? 6:00 PM Which of the following would most likely occur if the oxygen in a pond decreased? fish would die Which would increase the amount of dissolved oxygen in a pond? removing fish and adding plants Four fishermen fished for the same amount of time in different ponds. Which catch most likely came from the pond with the highest level of dissolved oxygen? catch B You begin pouring sodium chloride into a glass of water. For a long time, the sodium chloride just dissolves in the water, but suddenly it begins to pile up at the bottom of the glass. Which statement is true? The water is saturated. Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring both beakers, there is a small pile of Substance A at the bottom of the first beaker. None of Substance B is visible in the second beaker. Which of the following statements is true? Substance A is less soluble in water than Substance B. Which one of the following graphs best describes the solubility of potassium nitrate (KNO )in water at different temperatures? graph C Comparing potassium nitrate (KNO ) and sodium chloride (NaCl), which chemical's solubility (in water) is most affected by change in temperature? potassium nitrate Which of the charts below is most likely to represent a saturated solution? Chart C Which of the following contains the largest percentage of the Earth's water? oceans because there is over 97% of earths water contained in oceans What is the defining characteristic of a water cycle? It has the same starting and ending point. What human activity uses the most water, worldwide? agriculture Where is the majority of the Earth's fresh water stored? In glaciers and icecaps What sequence of processes transports water from the ocean into a cloud? Evaporation and condensation.