Everyday chemistry
Rust, melting ice and the pH of a cleaning product are applied chemistry. A change of state is physical; making a new substance is a chemical reaction.
About: Everyday chemistry
Rust, melting ice and the pH of a cleaning product are applied chemistry. A change of state is physical; making a new substance is a chemical reaction.
Worked examples
What is the chemical formula of water?
Answer: H₂O. Two hydrogen atoms bonded to one oxygen atom.
A solution with pH 7 is:
Answer: Neutral. The scale runs 0 to 14: below 7 is acidic, above 7 is basic (alkaline).
Rust is the result of:
Answer: Iron oxidation. Iron reacts with oxygen and moisture to form iron oxide, a new substance.