A. Identify whether the following example is a physical change or a chemical change. 1. Methanol can be oxidized by sodium dichromate. 2. Gasoline is combusted in engines. 3. Ice freezes in chillers.
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.
A. Identify whether the following example is a physical change or a chemical change.
1. Methanol can be oxidized by sodium dichromate.
2. Gasoline is combusted in engines.
3. Ice freezes in chillers.
4. Lead becomes liquid at 327.5°C.
5. Ammonia is made from nitrogen and hydrogen.
6. Gallium melts in hand.
7. Calvin's cycle in plants makes sugar from the air.
8. Vinegar can be made from coconut water.
9. The tie-dye process makes colorful clothes.
10. Adding water to dilute alcohol concentration.
B. Describe whether the following are physical or chemical properties. Explain your answer in no more than 5 sentences.
a. Deoxygenated blood is darker than oxygenated blood.
b. Carbon dioxide emissions increase the acidity of oceans.
c. Alcohol tends to disappear faster than water.
d. Sugars undergo
e. Proteins get denatured in the presence of heat (such as cooking egg whites).
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