Which way of moving molecules across a membrane requires energy?

A. meiosis

B. diffusion

C. osmosis

D. active transport

According to the law of conservation of mass, mass cannot be gained or destroyed in a chemical reaction. Why can't you simply add the masses of two reactants to determine the total mass of product?

Compare and contrast the dynamics of energy transfer between the Eocene Period and the Cryogenian Period.

Determine the molecular formula of a compound that contains 26.7%, 12.1%, and 61.2%, and has a molar mass of 812 g/mol.

In order to withhold the specific chemical identity of a toxic substance, employers do not need to:

A woman informs her engineer husband that "hot water will freeze faster than cold water." He calls this statement nonsense but he does so in a polite sensitive manner.

Who created the periodic table and in what year?

Why is uranium 235 the most commonly used isotope for nuclear fission in current uses in nuclear power generation?

Based upon the pH scale, a vegetable with a pH of 5.3 would be

How many grams of Cl are in 535 g of CaCl2?

2. An object experiences an acceleration, g, when it is on the surface of a planet of radius R. What will be the acceleration on the object after it has been moved to a distance of 4R from the center of the planet? A) 168 B) 48 C) 1/4 g D) 1/16 g