When should the medical assistant perform handwashing instead of using alcohol foam? Select all that apply. 

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 × 1020 molecules of SO3. (NA= 6.022 × 1023 entities/mol).

Which is the correct net ionic equation for the reaction of aqueous ammonia (NH3) with nitric acid (HNO3)?

Which of the following period 3 chlorides would be expected to have the highest melting point?

Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride?

What type of spectrum, if any, would be produced if the light radiated by a heated atomic gas were to be dispersed through a prism?

The density of copper is 8.96 g/cm3. What is the mass in kg of a cube of copper metal that occupies a volume of 1728 cm3?

Which of the following increases an individual’s risk of developing a serious complication from influenza? Select all that apply. 

Which one of the following oxides does not react with water to form acid solutions?

Gallium (Ga) consists of two naturally occurring isotopes, 69Ga and 71Ga with masses of 68.926 and 70.925 amu respectively. The average atomic mass of Ga is 69.72 amu. Calculate the percentage abundance of each isotope.