Chemistry

(science) the smallest part of a chemical element that is found in the nature

The atom is composed of a nucleus containing protons and neutrons, surrounded by electrons.

the smallest structure of a substance consisting of a group of atoms

Molecules are made up of two or more atoms bonded together.

a substance that is composed of only one type of atom, typically characterized by specific physical and chemical properties

Oxygen is an essential element for human respiration.

a particle with a net electric charge due to loss or gain of one or more electrons

Sodium ions (Na⁺) and chloride ions (Cl⁻) combine to form table salt.

an action, thought, or feeling in response to something that has happened

Her immediate reaction to the news was one of disbelief.

(chemistry) a combination of two or more substances without forming a chemical bond or any chemical reaction

Air is a mixture of nitrogen, oxygen, and trace gases.

a water-soluble chemical substance that contains Hydrogen and has a sour taste or corrosive feature with a PH less than 7

The lemon juice contains citric acid, which gives it a sour taste and a pH of around 2.

completely lacking moral or honorable purpose or character

His base actions shocked everyone at the party.

the state of a substance that is neither solid nor liquid

The gas in the balloon expanded as it was heated by the sun.

flowing freely and in the form or state of a liquid

The liquid gold flowed smoothly into the mold, forming a beautiful statue.

firm and stable in form, not like a gas or liquid

The ice had formed into a solid block after being left in the freezer overnight.

the process or period of changing from one state, place, or condition to another

The transition from winter to spring is often unpredictable.

a quantitive mesasure used for determining how acidic or alkanic something is on a scale of 0 to 14

Lemon juice has a pH of 2, making it highly acidic.