Why do A and T (and G and C) pair in a DNA double helix?

Covalent bonds form between them.

Van der Waals forces are thus maximized.

Ionic interactions are thus maximized.

Hydrogen bonds form between them.

Nitrogen will react with hydrogen to form the compound ammonia. The compound formed has properties that are different from the elements that make it up. What has to occur in order for this compound to be formed?

Which reaction will shift to the right in response to a decrease in volume? a) n2 (g) + 3h2 (g) 2nh3 (g) b) h2 (g) + cl2 (g) 2 hcl (g) c) 2 so3 (g) 2 so2 (g) + o2 (g) d) 2hi (g) h2 (g) + i2 (g) e. 2 fe2o3 (s) 4 fe (s) + 3o2 (g) ?

1a) consider the mixed aldol condensation reaction of 1-methylcyclopentane-1-carbaldehyde (shown below) and 3,3-dimethyl-2-butanone (shown below) in the presence of sodium hydroxide.

Is Li has 7 valence electrons

What are the mole ratios of this 2HgO (s) ⎯→ 2Hg (l) + O2 (g) and this 4NH3 (g) + 6NO (g) ⎯→ 5N2 (g) + 6H2O (l)

Which is a base unit in SI? A. centimeter B. kilogram C. gram D. grams/milliliter

The primary mechanism for converting atmospheric carbon into usable forms for life on earth is achieved by

For a particular collision, she detects the emitted products and find 15 protons, 2 antiprotons, 7 positrons, and 24 neutral particles. How many electrons are also emitted

Suppose you wanted to change the rate of a chemical reaction. what might you change in the reaction? explain the factor

Carbon-13 is an isotope of carbon. The atomic number of carbon is 6. How many neutrons does carbon-13 have?