How do pencil models of atoms differ from real atoms?

In which geologic era were the dinosaurs? A. Mesozoic B. Precambrian C. Cenozoic D. Paleozoic

A certain ore is 33.0% nickel by mass. How many kilograms of this ore would you need to dig up to have 25.0 g of nickel?

5.80 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant.

As a star increases in brightness, which value becomes smaller? A. density B. magnitude C. temperature D. luminosity

Which is the best volumetric glassware to use for accurately measuring a set volume of liquid?

What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation? A) mole ratio B) reactant ratio C) product ratio D) yield ratio E) none of the above

Equation for ammonium iodide + aluminum sulfide

How many grams of NO can be produced if 204 g of NO2 is mixed with 58.1 g of H2O? Express your answer with the appropriate units.

An exception to this trend occurs in Group 13, and gallium is smaller than aluminum. Justify this exception to the expected periodic trend by invoking the electron configurations of each element.

A population of ground squirrels lives in underground burrows several miles from an ocean shore. If a hurricane strikes the shore, which effect of the hurricane would probably do the most damage to the squirrel population? A. thunder B. lightning C.