chm midterm

Sodium fluoride is added to drinking water. A 25-L sample of city water contains 0.018 g NaF. Express this concentration in molarity?

0.000017

How many moles of CO2 are present in 220 mg?

0.005

Polocaine is a local anesthetic administered by injection. A 50-mL, multidose vial is available containing 100 mg of mepivacaine hydrochloride. What is the %(w/v) of the concentration of the solution

0.2%

how many protons and electrons does Mg2+ have?

12 protons and 10 electrons

What is the molecular weight (formula weight) of isopentyl acetate, a compound responsible for the odor of bananas?

130.19 amu

A pressurized tank contains nitrogen at 1.3 atm, oxygen at 0.7 atm, and helium at 0.1 atm. The reading of the pressure gauge is expected to be?

2.1 atm

A 40 mg dose of iodine-131 with a half life of 8 days is administered to a patient. How long will it take for the iodine to decay so that there are only 5 mg remaining?

24 days

The number 390000 expressed correctly in scientific notation is?

3.9x10^5

Determine the number of moles of aluminum in 2.154x10^-1 kg of Al?

7.984 mol

Zenapax is used as part of the immunosuppressive therapy for transplant patients. The dosage is calculated on the basis of 1.0 mg/kg. What is the proper dose for a 175 lb patient>

79 mg

The compound BaBr2 is named?

Barium Bromide

Which statement is correct?

Fe is a transition metal

The geometry of the CS2 molecule is best described as?

Linear

what is the formula for sodium sulfate?

Na2SO4

Application of the concepts of VSEPR theory leads to the prediction that the shape of the PH3 molecules?

Trigonal Pyramidal

Which one of the following is most likely to be an ionic compound?

calcium chloride

The name of the species of N2O4 is?

dinitrogen tetroxide

Solids have ________ shape and _________ volume?

fixed/fixed

Which of the following is a chemical change?

frying an egg

A sample if nitrogen gas exerts a pressure of 9.80 atm at 32 C. What would its temperature be (in C) when its pressure is increased to 11.2 atm?

idk

All atoms of the same elements that have the same atomic number, but different mass numbers are known as?

isotopes

How many neutrons are in a neutral atom of carbon-13?

seven

Choose the incorrect state about the proton?

the proton has the same charge as the neutron

The instructions for a cough syrup are to give two teaspoons every 8 hours. The cough syrup is supplied in 150mL bottles. How many bottles must be purchased to treat 3 children for 5 days?

three bottles

What is a pure substance?

water