Physics
Fox
Summary
- In the right circumstances, the chemical bonds between molecules can be broken, and new bonds formed. (This is known as a chemical reaction.)
- When bond-breaking or bond-forming creates something new, it is known as a chemical change.
- A physical change is where matter changes its form, but not the molecules its made from.
- Changing state (e.g. freezing, boiling) is a common example of a physical change.
- The number (and type) of atoms stays the same for both chemical and physical changes.
- Therefore, the total mass also stays the same for both chemical and physical changes (this is known as the law of conservation of mass).
Quiz
Water boils to form steam. This is an example of...
An old iron key reacts with oxygen, forming rust (aka. ”iron oxide“). This is an example of a...
Flour and sugar are poured into a bowl. They are mixed together. This is an example of...
Before a chemical change, there are 5 H2O molecules. How many Hydrogen atoms are there afterwards?
Before a physical change, there are 5 H2O molecules. How many Hydrogen atoms are there afterwards?
An ice cube weighs 30g. The ice cube melts. What is the mass of the water formed?
88g of sugar reacts to form H2O and CO2. No sugar is left. What mass of H2O and CO2 has been made?
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