What is 83.5 centigrams, cg, in ounces, oz? A. 295 oz B. 23.7 oz C. 0.0295 oz D. 2.37 x 105

Red gold is a gold-copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 7.05 g and has a volume of 0.504 cm. Gold has a density of 19.3 g/cm' and copper has a density of 8.96 g/cm³. Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains. gold: copper: Pure gold is defined as having 24 carats. When mixed in an alloy, the carats of gold are given as a percentage of this value. For example, a piece of jewelry made with 50% gold has 12 carats. State the purity of this piece of red gold jewelry in carats. purity: carats 10:08 AM 9/3/2021 64°F Clear ENG

2. The density of Zinc is 7.13 g/cm3. What is the volume of a sheet of zinc that is 45cm by 60cm in area and has a thickness of 0.0155cm? T.

Iron pyrite (fool's gold, page 11) has a shiny golden metallic appearance. Crystals are often in the form of perfect cubes. A cube 0.40 cm on each side has a mass of 0.064 g. a.Which of these observations are qualitative and which are quantitative? b.Which of the observations are extensive and which are intensive? c.What is the density of the sample of iron pyrite?

3. A gold brick is 15.24 cm long, 7.62 cm wide weighs 5,690.0 g. What is the height of the brick?

How many cubic centimeters are in 12.60 cubic feet? (2.54 cm = 1 inch).

calculate the volume in cm3 of 1,555,738,322 ng of manganese. the density of manganese is 7.20 g/cm3

1. In the olden days, US minted pennies were pure copper, but copper got so expensive that a pure copper penny was worth more than I cent. Modern pennies are composed of zinc and coated with copper. A student determines the mass of a penny to be 2.482 g. After making several scratches in a penny, the student puts the penny into hydrochloric acid, where the zinc (but not the copper) reacts with hydrochloric acid via a single replacement reaction. The hydrogen is collected at 25°C over water. The collected gas occupies 0.899 L at a total pressure of 791 mm Hg. A. Calculate the moles of hydrogen produced in the reaction. (Hint: Use the Table 1. to determine the vapor pressure of water and assume that all of the zinc in the penny dissolves.) B. Write a balanced chemical reaction for zinc and hydrochloric acid. C. Use stoichiometry to calculate the mass of zinc in the penny. D. Determine the percent zinc (by mass) in the penny.

A buret contains an unknown solution. mL Initially the buret was filled with the solution so that it read 12.46 mL and the balance below read 111.71 g with an 21 empty beaker on it. Some volume of the solution was dispensed into the beaker. Use the measurements from the buret and the balance to 22 determine the density of the unknown solution. d = g/mL 31.47

In SI units, land area is measured in hectares (1ha =1hm2) The commonly used unit for land area in the United States is the acre.   How many acres correspond to 4 ha? (1mi2 = 640 acres,1mi = 5280ft, 1ft = 12in).