The density of lead is 11.3

g/mL

. The water level in a graduated cylinder initially at 206

mL

rises to 287

mL

after a piece of lead is submerged. What is the mass in grams of the lead?

Identify one disadvantage to each of the following models of electron configuration: Dot structures Arrow and line diagrams Written electron configurations

Which statement correctly describes an endothermic chemical reaction? (1) The products have higher potential energy than the reactants, and the ΔH is negative. (2) The products have higher potential energy than the reactants, andthe ΔH is positive.

Which compound contains both sigma and pi bonds

Whats the mass of 225cm^3 of ethanol?

For the following endothermic reaction system at equilibrium: 2SO3 (g) 2SO2 (g) O2 (g) Choose the changes that will shift the equilibrium position to the right. (Select all that apply.) a. Decrease temperature b. Add Ne (g) c. Add a catalyst d.

Combustion analysis of an unknown compound provides the following dаta: 73.5 grams C, 4.20 grams H, and 72.3 grams Cl. What is the percent composition of each element in this compound?

How many barium atoms are in Ba (MnO4) 2?

A scientist who deals with the properties, composition, and reactions of substances

Discuss carbohydrate chemistry

A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correct symbol for this nuclide? Superscript 27 subscript 60 upper C o. Superscript 33 subscript 60 upper C o.