Which of the following is a solution? Dirt An alloy Wood Plastic

This scientist led a series of experiments that used high speed lightweight atoms called alpha particles to bombard very thin pieces of gold foil. Some of the alpha particles went straight through the foil, but a few alpha particles bounced back.

Multiple Choice A scientist performs an experiment on an unknown element. She finds that the unknown element forms an ionic bond with beryllium (Be). She concludes that the unknown element must belong in group 2 of the periodic table.

0.314 g of a certain nonelectrolytic solute is dissolved in 2.95*102 mL of H2O. The osmotic pressure of this solution is 2.49*102 torr at 21.0 °C. Calculate the molar mass of the solute. (760 Torr = 1 atm)

Which of the following is true of the water molecule? A. It has a linear shape and is polar B. It has a bent shape and is polar C. It has a linear shape and is not polar D. It has a bent shape and is not polar

What is the half-life of a 3 g sample of radioisotope that decayed to 0.75 g in 30 days?

Assume that 8.5 L of iodine gas are produced at STP according to the following equation: 2KL+Cl2 = 2KCl + I2 How many moles of Kl were used? How many grams of Kl were used?

Which of the following is a soft metal in the lightest element that is a solid at standard temperature and pressure? A) lithium B) silicon C) silica D) cobalt

What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filling it from the bottom up? Gas Liquid Plasma Solid

How does 0.5 m sucrose (molecular mass 342) solution compare to 0.5 m glucose (molecular mass 180) solution?

Which particles make up the nucleus of an atom? protons and electrons neutrons and electrons protons only protons and neutrons neutrons only