A group of two or more atoms chemically bonded together, such as water being made up of two hydrogen atoms and one oxygen atom
The physical form in which matter exists, such as a solid, liquid, or gas
Rain that is more acidic than normal, which can harm the environment and damage buildings and structures. It happens when pollution mixes with rain clouds
The ability of a substance to catch fire easily and burn
To mix evenly with a liquid, such as when salt is mixed with water
Things that make the environment dirty or unsafe, like chemicals, gasses, and particles. They can cause health problems for people and harm the environment
A type of matter that has a uniform and definite composition, such as water or salt
A process in which one or more substances are transformed into new substances with different properties
A gas that make up a large part of the Earth's atmosphere, with nitrogen and oxygen being the most abundant
A gas that make up a large part of the Earth's atmosphere, with nitrogen and oxygen being the most abundant
A smell or scent, often used to describe how something smells
A combination of two or more substances that are not chemically combined, such as saltwater or trail mix
A chemical element with the symbol S, often used in fertilizers and in the production of sulfuric acid
A substance that undergoes a chemical reaction to produce a product
The smallest unit of matter that still retains the properties of an element