Why are familiar objects such as pens and paper clips not commonly counted in moles?

A nitrous acid buffer solution contains 0.85 M nitrous acid (HNO2) and 0.61 M of its conjugate base (NO2-). If a chemist adds 0.15 mol of hydrobromic acid (HBr), a strong acid, to 0.

which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains.

1. A student calculated the theoretical yield of BaSO4 (s) in a precipitation experiment to be 1.352 grams. When she filtered, dried, and weighed her precipitate, however, her actual yield was only 1.279 grams. Calculate the student's percent yield.

Complete and balance the molecular equation for the reaction of aqueous sodium carbonate, Na 2 CO 3, and aqueous nickel (II) chloride, NiCl 2. Include physical states.

Explain why the metal part of a seatbelt will become so much hotter in summer than the cloth part of the seatbelt.

Two components combine to create a binary ionic compound. Name one of them

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False