You add 8.9 g of iron to 23.40 mL of water and observe that the volume of iron and water together is 24.53 mL. Calculate the density of iron. Express your answer to two significant figures with the appropriate units.

A chemist in a galaxy far, far away performed the Millikan oil drop experiment and got the following results f? 1.64 10-12 zirkombs 4.92 10-12 zirkombs Use these data to calculate the probable charge of the electron in zirkombs.

How hot would a 2.3 L balloon have to get to expand to a volume of 3.0 L? Assume the initial temperature of the balloon is 24 °C, and that the pressure inside the balloon remains constant. A. 3 K B. 42 K C. 128 K D. 390 K

How many grams of hydrogen are necessary to react completely with 50.0 g of nitrogen

Which of the following can take the shape of the container it is in but has a fixed volume? argon gas liquid bromine solid water hydrogen plasma

Which compound is a nonelectrolyte? copper chloride carbon tetrachloride sodium bromide magnesium sulfate?

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g

What two elements make up dihydrogen monoxide?

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves