A cup can hold 50 ml of water and has a mass of 25g. If each penny weighs 2g, how many pennies can it hold before it sinks in fresh water? Explain how you got your answer.

Explain how parasitism differs from commensalism.

Which type of radiation travels as an electromagnetic wave? * a) alpha particle b) beta particle c) gamma ray d) X-ray

In Rutherford's experiment, why did the nucleus repel alpha particles? a. electrostatic repulsion between the negatively charged nucleus and alpha particles b. electrostatic attraction between the negatively charged nucleus and alpha particles c.

The fission of an atom that has a larger atomic number can be induced by bombarding the atom with

After concluding his research, which statements would Virchow agree with? Check all that apply. Living things come from nonliving things. Cells can come from nonliving materials. Frogs can come from mud.

Xander is gaining weight. Which best describes what he can do to prevent obesity? exercise every day and also make healthy choices in his diet excercise once a week but make no change in his diet exercise once a week and also make healthy choices in

The town in the video stressed using locally made goods instead of imported goods. How could using locally made goods lower CO2 emissions?

Calculate the ΔHrxn for the following reaction: CH4 (g) + 2Cl2 (g) - - > CH2Cl2 (g) + 2HCl (g) Use the following reaction and given ΔH's: CH4 (g) + Cl2 (g) - - > CH3Cl (g) + HCl (g), ΔH = - 99.

Select all that apply to diffusion. A solid cannot diffuse in to another solid. Solids can diffuse in liquids. Liquids can diffuse in liquids. It is the process of intermingling atoms from one substance into another.

We are all familiar with the general principles of operation of an internal combustion engine: the combustion of fuel drives out the piston.