How is diffusion used by cells? (Missed this lesson in school)

Which choice can be a solid, liquid, or a gas? A. steel B. silver C. water D. carbon dioxide

Knowing the reactions between hydrogen gas and oxygen gas to form water is exothermic which would you say is greater: the average bond energies for hydrogen and oxygen or the bond energies for water? Explain.

The specific heat of wood is 2.03 (J/gºC). How much heat is needed to convert 550 grams of wood at 15°C down to 10 °C?

What force is needed to accelerate a car with a mass of 950 kg at a rate of 5.0 meters/sec2? 190 N 4,750 N 955 N

Fill in the blank with either "insulators" or "conductors" to complete the sentence. the conductivity of a material is determined by the number of free electrons. have few or no free electrons.

Which sub-layer thins out into space, where there is no air

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.

What scientific discoveries led to changes in Dalton's atomic theory?

What does berkelium react with