A.1.1.1-A.1.1.2 Intro to Water

Front

Where do most hypotheses today predict the place the first cells?

Back

In the oceans

Front

What happened during the formation of the first cells?

Back

A small volume of water became enclosed in a membrane, allowing chemical reactions to occur between solutes.

Front

Why are most molecules of life still dissolved in water?

Back

Because water in a liquid state allows molecules to move around and interact, enabling life processes.

Front

What type of bonds exist between oxygen and hydrogen atoms in a water molecule?

Back

Polar covalent bonds.

Front

Why are the covalent bonds in water molecules considered polar?

Back

Because the sharing of electrons is unequal, with the oxygen atom being more attractive to electrons than the hydrogen atom.

Front

What charge do hydrogen and oxygen atoms have in a water molecule?

Back

Hydrogen atoms have a partial positive charge, and the oxygen atom has a partial negative charge.

Front

What is the shape of a water molecule?

Back

Bent, with two hydrogen atoms on the same side forming one pole and the oxygen atom forming the opposite pole.

Front

What is a hydrogen bond in the context of water molecules?

Back

An intermolecular force where a slightly positive hydrogen atom in one polar molecule is attracted to a slightly negative atom of another polar molecule.

Front

Why are hydrogen bonds significant in water?

Back

Although weak individually, the large number of hydrogen bonds collectively give water its unique properties important to living things.