Question

1.)   An isotope has 9 protons and 10 neutrons. The isotope has a charge of -1. How many electrons does this isotope have?

2.)   An atom called X is bonded to another atom by a triple bond. What is the maximum number of additional atoms that can be bonded to X and still conform to the octet rule?

3.)   One tablet of Tums antacid contains 500.0 mg of calcium carbonate. When calcium carbonate reacts with hydrochloric acid (from gastric juices), carbon dioxide gas, water and aqueous calcium chloride are produced. Write a complete balanced chemical equation for this reaction.

4.)   80-proof brandy is a 40.0% (v/v) ethanol solution. The proof is twice the percent concentration of the alcohol in the beverage. How many mL of alcohol are present in a 750. mL bottle of brandy?

5.)   You are required to prepare a H2SO4 (aq) solution. You dissolve 16.5 g H2SO4 in order to prepare the 150. mL aqueous solution. Find the molarity of the solution. Identify what the solvent is.

6.)   The volume of blood plasma in adults is 3.1 L. Its density is 1.03 g/cm3. Approximately how many ounces (oz.) of blood plasma does an average adult have?

7.)   Aluminum zirconium tetrachlorohydrex glycine is a complex used in antiperspirants. Without the glycine complex, the chemical formula is Al4Zr(OH)12Cl4. Given this formula, what is the percent composition of each element in this compound?

8.)   The STP volume of an ideal gas is 3.79 m3. Calculate the volume of the sample at 1.75 atm and 27 °C.

9.)   Hydrogen gas can be produced in the lab through a reaction with Zn metal and most acids. When 12.0 g of Zn reacts, what volume, in L, of hydrogen gas is produced at 24.0 °C and 835 mm Hg?

10.) 10.) A person has a dietary restriction to have an intake of protein at 24 g per day. If this person eats an 8.0 oz burger that is 15.0% protein, have they exceeded the protein limit for the day?

Answer 1

1) Number of protons = 9 Charge of the isotope = -1 Number of electrons = 9 + 1 = 10