Which of the following are physical changes? List all that apply. (You can briefly explain your answers if you think any of them are not clear-cut) Hydrogen peroxide bubbles on a cut Sensitive documents are shredded Milk sours over time Water boils on the stove for pasta Silver tarnishes Bronze is melted down to cast a statue
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Which of the following are physical changes? List all that apply. (You can briefly explain your answers if you think any of them are not clear-cut)
Hydrogen peroxide bubbles on a cut Sensitive documents are shredded Milk sours over time
Water boils on the stove for pasta Silver tarnishes
Bronze is melted down to cast a statue
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