Lignum vitae is a hard, durable, and extremely dense wood used to make ship bearings. A sphere of this wood with a diameter of 7.60 cm has a mass of 313 g. (a) What is the density of the lignum vitae sphere?(b) Will the sphere float or sink in water?(c) Will the sphere float or sink in chloroform? (The density of chloroform is 1.48 g/mL.)

Calculate these masses.(a) What is the mass of 6.00 cm 3 of sodium, density = 0.97 g/cm 3 ?(b) What is the mass of 155 mL gaseous chlorine, density = 3.16 g/L?

Which of the following processes is a physical change? (a) evaporation of water; (b) combination ofhydrogen and oxygen gas to produce water; (c) dissolution of sugar in water; (d) separation of sodium chloride (table salt) into its constituentelements, sodium and chlorine; (e) combustion of sugar to produce carbon dioxide and water.

(1)   A rectangular block of wood has the following dimensions: 10.0 cm x 5.00 cm x 4.00 cm. The block weight 100 g. What is the density of the block of wood? (2)  What is the mass of a 400-mL sample of ethyl alcohol if its density is 0.8 g/mL?

A spherical steel ball has a mass of 3.475 g and a diameter of 9.40 mm. What is thedensity of the steel? |The volume of a sphere = (4/3)πr3 where r = radius.]

An individual weighs 81.4 kg and is 1.78 m tall. (a) What is the person's equivalent measurement in pounds? (b) What is the person's equivalent measurement in feet?

Having obtained the volume of a flask (25.00 cm³), the student emptied the flask, dried it, and filled it with an unknown liquid whose density she wished to determine. The mass of the stoppered flask when completely filled with liquid was 47.867 g. The mass of the empty stoppered flask was 26.192 g. Find the density of the liquid. (in g/cm³) (a) First we need to find the mass (in g) of the liquid by determining the difference. mass of liquid = g (b) The density of a pure substance is equal to its mass divided by its volume: density = mass volume Since the volume of the liquid equals that of the flask, we know both the mass and volume of the liquid and can easily find its density. Calculate the density (in g/cm³) of the unknown liquid. density of liquid=

If a dog has a mass of 20.1 kg, what is its mass in the following units? Use scientific notation in all of your answWers. (a) What is the dog's mass in grams? x 10 (b) What is the dog's mass in milligrams? x 10 mg (c) What is the dog's mass in micrograms? x 10

Be sure to answer all parts. Carry out the following operations as if they were calculations of experimental results and express each answer in standard notation with the correct number of significant figures and with the correct units. Enter both the answer and the units in the answer field. (a) 7.2129 m + 0.6 m + 4.33 m (b) 3.70 g-4.0933 g (c) 4.51 cm x 5.9233 cm

Calculate these volumes.(a) What is the volume of 35 g iodine, density = 4.93 g/cm 3 ?(b) What is the volume of 33.28 g gaseous hydrogen, density = 0.089 g/L?