How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? Choose all that apply.

(A) Transition metals

(B) Noble gases

(C) Group 6, Period 4

(D) Group 4, Period 6

The density of osmium, which is the densest metal, is 22.57 g/cm^3. What is the mass of a block of osmium that measures 1.00 cm x 4.00 cm x 2.50 cm? Show your work.

A hydrochloric acid solution will neutralize a sodium hydroxide solution. Consider the molecular views showing one beaker of HCl and four beakers of NaOH. Write a balanced chemical equation for the neutralization reaction.

Name the alcohol that contains five carbons and has a hydroxyl (alcohol) group on the second carbon.

Which of these would you expect to be solute in the non polar solvent CS2, carbon disulfide? A) H2O B) CBr4 C) CaCO3 D) MgS

What do the digestive and excretory systems have in common? Both break down food. Both produce urine. Both get rid of waste material. Both filter out waste material.

The town in the video stressed using locally made goods instead of imported goods. How could using locally made goods lower CO2 emissions?

Calculate the ΔHrxn for the following reaction: CH4 (g) + 2Cl2 (g) - - > CH2Cl2 (g) + 2HCl (g) Use the following reaction and given ΔH's: CH4 (g) + Cl2 (g) - - > CH3Cl (g) + HCl (g), ΔH = - 99.

Select all that apply to diffusion. A solid cannot diffuse in to another solid. Solids can diffuse in liquids. Liquids can diffuse in liquids. It is the process of intermingling atoms from one substance into another.

We are all familiar with the general principles of operation of an internal combustion engine: the combustion of fuel drives out the piston.

A first order reaction has a rate constant of 0.816 at 25 oC. Given that the activation energy is 22.7 kJ/mol, calculate the rate constant at 34 oC. (enter answer to 3 decimal places)