Name: ___________________________________ Date: ______________ Practice Test #3 ____ 1. When a precipitation reaction occurs, the ions that do not form the precipitate A) evaporate B) are cations only C) form a second insoluble compound in the solution D) are left dissolved in the solution E) none of these 2. An aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. The complete ionic equation contains which of the following species (when balanced in standard form)? A) B) C) D) E) ____ 3.
3. The coldest temperature ever recorded was a negative 126.9 degrees fahrenheit in Vostok Station, Antarctica. 4. Between evaporation and falling as precipitation, a droplet of water may travel thousands of miles. 5.
Properties of Water Lab Part A. Observations: When Copper Chloride was mixed into water the Copper Chloride started as small crystals in the bottom and sides of the test tube, but once shaken they completely dissolved into the water. When Copper Chloride was dropped into the alcohol it seemed to clump together and sink to the bottom, when shaken lightly or even vigorously the crystals of Copper Chloride simply moved around but retreated back to the bottom of the test tube when left still, it did not mix at all. Questions: 1. When Copper Chloride is added to water and shaken vigorously the copper Chloride completely dissolves leaving a pale transparent blue solution. 2.
Lab 2 – Water Quality and Contamination Experiment 1: Effects of Groundwater Contamination Table 1: Water Observations (Smell, Color, Etc.) Beaker Observations 1 No scent, color is clear 2 No scent, color is foggy, oil and water don’t mix well creating bubbles. 3 No color, water is clear, smells of vinegar 4 Smells like soap, water turned green 5 80 ml of water, brown in color, dirt sediment on the bottom, smells like dirt 6 80 ml of water, less oil, light brown in color, dirt sediments at the bottom 7 80 ml of water, slight vinegar and dirt scent, brown in color, dirt sediments at the bottom 8 80 ml of water, smells of soap, dark brown and slight green in color, dirt sediments at the bottom POST LAB QUESTIONS 1. Develop hypotheses on the ability of oil, vinegar, and laundry detergent to contaminate groundwater. a.
Canada has very cold, bitter winters some parts of Canada are steppe. The U.S. and Canada are some what the same in Alaska most of the state is tundra like half the country in Canada. Also the US and Canada are mostly humid continental and our highlands like in the U.S. the Rockies and Appalachians and for Canada there Rockies and laurnatan highlands are cool or cold year around. The US and Canada have almost the same climate in parts of each country but also very different in some parts as
When an ionic or polar compound enters water, it is surrounded by water molecules Salt or Sodium Chloride Salt is a mineral that is composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of ionic salts. So when an ionic substance (salt) dissolves in water, it is broken up into individual ions which are surrounded by water molecules. Baking soda Sodium bicarbonate or sodium hydrogen carbonate, known as Baking Soda, is the chemical compound with the formula Na HCO3. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine
CHE 111 Laboratory 3 Hydrates Introduction Hydrates Water molecules combine with the molecules of certain substances, forming loose chemical combinations called hydrates. An example of a hydrate is MgSO4•7H2O. This formula means 7 water molecules are loosely attached to a magnesium sulfate molecule. Other examples of hydrates are Na2SO4•10H2O and Ba(OH)2•8H2O. When the hydrate is heated, it easily loses water molecules attached and becomes an anhydrous salt.
60 percent of our water supply comes from the snowmelt from the Sierra Nevada Mountains, providing drinking water for 22 million people and over 600,000 acres of farmland. But since the rise in temperatures, the snow hasn’t come to melt into streams and reservoirs. So this means that water is gradually
The dependent variable was the “amount” of time it took for all 3-ice cubes to melt. This experiment contained several controlled variables; the size of the ice cube, the material and size of the dish the ice was placed in and the temperature of the room. The variables were measured in size by use of a ruler and by time by using a stopwatch. We used a single ice cube placed alone in a dish as our unaltered Control. The resulting data showed that it was the chemical reaction of the salt added to the ice that had the fastest melting process.
6) The ether was removed using the rotary evaporator. We discarded the used MGSO4 into solid waste containers. The solid that remained after ether evaporated was the neutral organic compound. 7) We scraped the solid from the flask with a spatula and allowed the solid to dry thoroughly on a piece of filter