A. Identify if the mentioned events underwent either chemical or physical changes? 1. You trim your finger nails. 2. Tarnishing of a silver spoon.. 3. Water boils. 4. Lemon juice converts milk to curds and whey.. Grinding wheat to flour. 5. 6. Water is broken down into hydrogen gas & oxygen gas. A car fender gets rusty. 7. 8. A piece of wood is ground up into sawdust. 9. Liquid alcohol vaporizes from an open container. Explosion of dynamite.. 10.
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.
Classify if the following are either homogeneous or heterogeneous mixture?
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