Ch 2 Chemistry of Life (Lesson 1 & 2)

Front

What is a base?

Back

A base is a substance that tastes bitter, feels slippery, and can accept protons or donate electron pairs in reactions.

Front

How do you calculate the number of neutrons in an atom?

Back

To find the number of neutrons, round the atomic mass and subtract the atomic number from it: Neutrons = Atomic Mass - Atomic Number.

Front

What type of bond is formed between atoms of different charges?

Back

An ionic bond is formed between atoms that gain or lose electrons, resulting in charged ions.

Front

What ions do acids produce when they dissociate?

Back

Acids produce hydrogen ions (H+) when they break down or dissociate.

Front

Which property of water allows it to float when frozen?

Back

Frozen water floats on liquid water due to its lower density in the solid state compared to the liquid state.

Front

What is the significance of hydrogen bonds in water?

Back

Hydrogen bonds cause water molecules to stick to each other, leading to unique properties like cohesion and surface tension.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.

Front

What is an acid?

Back

An acid is a substance that tastes sour, can donate protons (H+), and turns blue litmus paper red.

Front

What is the difference between a covalent bond and an ionic bond?

Back

A covalent bond involves the sharing of electron pairs between atoms, while an ionic bond involves the transfer of electrons from one atom to another.

Front

What is the role of water in biological systems?

Back

Water is essential for life, serving as a solvent, a medium for chemical reactions, and helping to regulate temperature.