Which biological molecule is in the shape of a double helix?

A. Enzyme

B. Deoxyribonucleic acid (DNA)

C. Amino acid

D. Ribonucleic acid (RNA)

Some properties of liquid water are very different from those of solid water (ice). Explain why freezing is considered a physical change, even though the properties of water change when it freezes.

Ice cubes in water and explain why it is either a homogeneous or heterogeneous mixture.

Consider the following equation. 2H2 (g) + O2 (g) 2H2O (g); ΔH is negative. Which statement is true? The reaction is endothermic from left to right. Increased pressure would increase the rate of forming water vapor.

Determine the mass of 5.25*10^24 atoms Cl

The volume of an object is 50cm3 and its mass is 150g. What is its density?

How are real gases different from ideal gases?

Which one doesnt belong in the list below? A. a meter B. one liter C. One centimeter D. one kilometer

Which elements did curies discover

When rubidium metal is exposed to air, two atoms of rubidium, Rb, combine with one atom of oxygen. If 1.98 grams of rubidium is exposed to air, what will be the mass of the product in grams

Fission reactions can get of of control without what taking place?