yes its made of oxygen and hydrogen
Pure substances are rare; materials around us in the nature are mixtures. Examples: ocean water, air, oil, foods ae mixtures.
No, rainwater would be pure water if it weren't for the contaminates is picks up from the air while falling.
It is based as salt water but then turned into pure water. 1. The ocean water evaporates into water vapor leaving all the salt and other chemicals behind 2.The water vapor turns into clouds 3.The clouds build up in water so much they rain. So yes rain water is pure
The percentage of pure water in ocean water is 96.5%
Pure elements cannot be mixtures.
Strictly, water itself is a pure substance, but most of the samples of water we meet are mixtures. De-ionized water which we use in the lab is water and nothing else (pure). Tap water and natural samples from the world around us contain dissolved substances from the air and the rocks, so they are mixtures.
The boiling point of ethanol-water mixtures varies depending on the ratio of ethanol to water. Generally, the boiling point of these mixtures falls between the boiling points of pure ethanol (78.37C) and pure water (100C). The boiling point increases as the ethanol content in the mixture increases.
Mixtures
It is heterogeneous by the fine dirt particles collected above polluting land area. Maybe rainwater from ocean rainclouds collected far from industrialized coasts is about clear enough to call it a homogeneous solution of carbon dioxide (and other gases) in pure water.
Samples that are pure water include distilled water, rainwater, and water that has been filtered through a reverse osmosis system. These samples do not contain any dissolved minerals or impurities.
Both rainwater and distilled water are forms of pure water as they contain minimal impurities. Distilled water is water that has been boiled and condensed, removing impurities like minerals and contaminants. Rainwater, on the other hand, can pick up pollutants from the atmosphere as it falls but is generally considered pure unless contaminated by environmental factors.
Virtually none. Ever fresh rainwater or snow has dissolved impurities in it.