04:19Density - Why does oil float on water? | #aumsum #kids #science #education #childrenIt's AumSum Time659views
11:06Chemistry Basics | classification and properties of matter, densityThe Science Classroom261views
Multiple ChoiceWhen lead levels in blood exceed 0.80 ppm (parts per million) the level is considered dangerous. 0.80 ppm means that 1 million g of blood would contain 0.80 g of Pb. Given that the density of blood is 1.060 kg/cm3, how many grams of Pb would be found in 400.00 mL of blood at 0.620 ppm?1208views11commentsHas a video solution.
Multiple ChoiceHow many mL of bromine are required to deliver 0.25 g of bromine into a reaction? (dBr = 3.12 g/cm3)217views
Textbook QuestionConsider the two spheres shown here, one made of silver and the other of aluminum. (a) What is the mass of each sphere in kg? 289viewsHas a video solution.
Textbook QuestionConsider the two spheres shown here, one made of silver and the other of aluminum. (a) What is the mass of each sphere in kg? 372viewsHas a video solution.
Textbook Question(b) Three cubes of equal mass are composed of gold 1density = 19.32 g/cm32, platinum 1density = 21.45 g/cm32, and lead 1density = 11.35 g/cm32. List the cubes from smallest to largest.855viewsHas a video solution.
Textbook QuestionConsider 20 mL samples of the following liquids. Which sample has the largest mass? (LO 1.9) (a) Water (density = 1.0 g/mL) (b) Glycerol (density = 1.26 g/mL) (c) Ethanol (density = 0.79 g/mL) (d) Acetic acid (density = 1.05 g/mL587viewsHas a video solution.
Textbook QuestionThe cylinder contains two liquids that do not mix with one another: water (density = 1.0 g/mL) and vegetable oil (density = 0.93 g/mL). Four different pieces of plastic are added to the cylinder. Which type of plastic is at the position indicated by the square object in the figure? (LO 1.10) (a) Polyvinyl chloride (density = 1.26 g/mL) (b) Polypropylene (density = 0.90 g/mL) (c) High-density polyethylene (density = 0.96 g/mL) (d) Polyethylene terephthalate (density = 1.38 g/mL) 435viewsHas a video solution.
Textbook QuestionWhich block in each of the following drawings of a balance is more dense, red or green? Explain.239viewsHas a video solution.
Textbook QuestionThe following cylinder contains three liquids that do not mix with one another: water (density = 1.0 g/mL), vegetable oil (density = 0.93 g/mL), and mercury (density = 13.5 g/mL). Which liquid is which?432viewsHas a video solution.
Textbook Question(b) Carbon dioxide 1CO22 is a gas at room temperature and pressure. However, carbon dioxide can be put under pressure to become a 'supercritical fluid' that is a much safer dry-cleaning agent than tetrachloroethylene. At a certain pressure, the density of supercritical CO2 is 0.469 g>cm3. What is the mass of a 25.0-mL sample of supercritical CO2 at this pressure?1486viewsHas a video solution.
Textbook Question(a) A sample of tetrachloroethylene, a liquid used in dry cleaning that is being phased out because of its potential to cause cancer, has a mass of 40.55 g and a volume of 25.0 mL at 25 C. What is its density at this temperature? Will tetrachloroethylene float on water? (Materials that are less dense than water will float.)1117viewsHas a video solution.
Textbook Question(b) An experiment requires 45.0 g of ethylene glycol, a liquid whose density is 1.114 g>mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?892viewsHas a video solution.
Textbook Question(a) To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a 45-mL sample of the substance. She then measured the mass of the sample, finding that it weighed 38.5 g. She knew that the substance had to be either isopropyl alcohol 1density 0.785 g>mL2 or toluene 1density 0.866 g>mL2. What are the calculated density and the probable identity of the substance?1181viewsHas a video solution.
Textbook Question(b) An experiment requires 15.0 g of cyclohexane, whose density at 25 C is 0.7781 g>mL. What volume of cyclohexane should be used?496viewsHas a video solution.
Textbook Question(a) After the label fell off a bottle containing a clear liquid believed to be benzene, a chemist measured the density of the liquid to verify its identity. A 25.0-mL portion of the liquid had a mass of 21.95 g. A chemistry handbook lists the density of benzene at 15 C as 0.8787 g>mL. Is the calculated density in agreement with the tabulated value?731viewsHas a video solution.
Textbook QuestionThe density of air at ordinary atmospheric pressure and 25 C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 4.5 m * 5.0 m * 2.5 m?5127viewsHas a video solution.
Textbook QuestionA new penny has a mass of 2.49 g and a volume of 0.349 cm3. Is the penny made of pure copper? Explain your answer.1465viewsHas a video solution.
Textbook QuestionWhat is the density of glass in g/cm3 if a sample weighing 27.43 g has a volume of 12.40 cm3?824viewsHas a video solution.
Textbook QuestionWhat is the density of lead in g/cm3 if a sample weighing 206.77 g has a volume of 15.50 cm3?895viewsHas a video solution.
Textbook QuestionGlycerol is a syrupy liquid often used in cosmetics and soaps. A 3.25 L sample of pure glycerol has a mass of 4.10 * 103 g. What is the density of glycerol in g>cm3?1281viewsHas a video solution.
Textbook QuestionA vessel contains 4.67 L of bromine whose density is 3.10 g/cm3. What is the mass of the bromine in the vessel (in kilograms)?539viewsHas a video solution.
Textbook QuestionEthylene glycol (antifreeze) has a density of 1.11 g>cm3. a. What is the mass in g of 417 mL of ethylene glycol? b. What is the volume in L of 4.1 kg of ethylene glycol?1909views1commentsHas a video solution.
Textbook QuestionAspirin has a density of 1.40 g/cm3. What is the volume in cubic centimeters of an aspirin tablet weighing 250 mg? Of a tablet weighing 500 lb?1179viewsHas a video solution.
Textbook QuestionEthylene glycol (antifreeze) has a density of 1.11 g>cm3. a. What is the mass in g of 417 mL of ethylene glycol? b. What is the volume in L of 4.1 kg of ethylene glycol?1815viewsHas a video solution.
Textbook QuestionGaseous hydrogen has a density of 0.0899 g/L at 0 °C, and gaseous chlorine has a density of 3.214 g/L at the same tem-perature. How many liters of each would you need if you wanted 1.0078 g of hydrogen and 35.45 g of chlorine?984viewsHas a video solution.
Textbook QuestionAcetone (nail polish remover) has a density of 0.7857 g>cm3. a. What is the mass in g of 28.56 mL of acetone? b. What is the volume in mL of 6.54 g of acetone?2134viewsHas a video solution.
Textbook QuestionA small airplane takes on 245 L of fuel. If the density of the fuel is 0.821 g>mL, what mass of fuel has the airplane taken on?1945viewsHas a video solution.
Textbook QuestionHuman fat has a density of 0.918 g>cm3. How much volume (in cm3) is gained by a person who gains 10.0 lb of pure fat? the reliability of a Measurement and Significant Figures1314views1commentsHas a video solution.
Textbook QuestionThe density of chloroform, a widely used organic solvent, is 1.4832 g/mL at 20 °C. How many milliliters would you use if you wanted 112.5 g of chloroform?2381viewsHas a video solution.
Textbook QuestionMore sulfuric acid (density = 1.8302 g/cm3) is produced than any other chemical—approximately 3.6 * 1011 lb/yr world-wide. What is the volume of this amount in liters?1122viewsHas a video solution.
Textbook QuestionTwo spheres of equal volume are placed on the scales as shown. Which one is more dense? 334viewsHas a video solution.
Textbook QuestionWater has a density of 0.997 g>cm3 at 25 C; ice has a density of 0.917 g>cm3 at -10 C. (a) If a soft-drink bottle whose volume is 1.50 L is completely filled with water and then frozen to -10 C, what volume does the ice occupy? (b) Can the ice be contained within the bottle?4593views1rankHas a video solution.
Textbook QuestionA flask containing 11.7 mL of a liquid weighs 132.8 g with the liquid in the flask and 124.1 g when empty. Calculate the density of the liquid in g>mL to the correct number of significant digits.1507viewsHas a video solution.
Textbook QuestionGold is alloyed (mixed) with other metals to increase its hardness in making jewelry. (b) The relative amount of gold in an alloy is commonly expressed in units of carats. Pure gold is 24 carat, and the percentage of gold in an alloy is given as a percentage of this value. For example, an alloy that is 50% gold is 12 carat. State the purity of the gold jewelry in carats.1269viewsHas a video solution.
Textbook QuestionYou are assigned the task of separating a desired granular material with a density of 3.62 g>cm3 from an undesired granular material that has a density of 2.04 g>cm3. You want to do this by shaking the mixture in a liquid in which the heavier material will fall to the bottom and the lighter material will float. A solid will float on any liquid that is more dense. Using an Internet-based source or a handbook of chemistry, find the densities of the following substances: carbon tetrachloride, hexane, benzene, and diiodomethane. Which of these liquids will serve your purpose, assuming no chemical interaction takes place between the liquid and the solids?639viewsHas a video solution.
Textbook QuestionWhen an irregularly shaped chunk of silicon weighing 8.763 g was placed in a graduated cylinder containing 25.00 mL of water, the water level in the cylinder rose to 28.76 mL. What is the density of silicon in g/cm3?712viewsHas a video solution.
Textbook QuestionAnswer the following questions. (d) A particular sample of crude oil has a density of 0.85 g/mL. What is the mass of 1.00 barrel of this crude oil in kg, where a barrel of oil is exactly 42 gallons?874viewsHas a video solution.
Textbook QuestionAnswer the following questions. (c) A certain type of wood has a density of 0.40 g/cm3. What is the mass of 1.0 cord of this wood in kg, where 1 cord is 128 cubic feet of wood405viewsHas a video solution.
Textbook QuestionA bag of Hershey's Kisses contains the following information: Serving size: 9 pieces = 41 g Calories per serving: 230 Total fat per serving: 13 g (b) The density of a Hershey's Kiss is 1.4 g/mL. What is the volume of a single Hershey's Kiss?969viewsHas a video solution.
Textbook QuestionVinaigrette salad dressing consists mainly of oil and vinegar. The density of olive oil is 0.918 g/cm3, the density of vinegar is 1.006 g/cm3, and the two do not mix. If a certain mixture of olive oil and vinegar has a total mass of 397.8 g and a total volume of 422.8 cm3, what is the volume of oil and what is the volume of vinegar in the mixture?2055viewsHas a video solution.
Textbook QuestionA calibrated flask was filled to the 25.00 mL mark with ethyl alcohol. By weighing the flask before and after add-ing the alcohol, it was determined that the flask contained 19.7325 g of alcohol. In a second experiment, 25.0920 g of metal beads were added to the flask, and the flask was again filled to the 25.00 mL mark with ethyl alcohol. The total mass of the metal plus alcohol in the flask was determined to be 38.4704 g. What is the density of the metal in g/mL?472viewsHas a video solution.
Textbook QuestionThe density of titanium is 4.51 g>cm3. What is the volume (in cubic inches) of 3.5 lb of titanium?2324viewsHas a video solution.
Textbook QuestionAn iceberg has a volume of 7655 ft2. What is the mass of the ice (in kg) composing the iceberg (at 0 °C)?480viewsHas a video solution.
Open QuestionIf a substance has a large mass and a small volume, what can you conclude about it?112viewsHas a video solution.
Open QuestionWhat is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/mL?123viewsHas a video solution.
Open QuestionWhat two quantities must be known to calculate the density of a sample of matter?131viewsHas a video solution.
Open QuestionWhat volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3.129viewsHas a video solution.
Open QuestionIf the solid form of most molecules is heavier than the liquid form, why does ice float?81viewsHas a video solution.