Determine whether each of the following describes aphysical change or a chemical change: (a) The heliumgas inside a balloon tends to leak out after a few hours.(b) A flashlight beam slowly gets dimmer and finallygoes out. (c) Frozen orange juice is reconstituted byadding water to it. (d) The growth of plants depends onthe sun’s energy in a process called photosynthesis.(e) A spoonful of salt dissolves in a bowl of soup.
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.
Determine whether each of the following describes a
physical change or a chemical change: (a) The helium
gas inside a balloon tends to leak out after a few hours.
(b) A flashlight beam slowly gets dimmer and finally
goes out. (c) Frozen orange juice is reconstituted by
adding water to it. (d) The growth of plants depends on
the sun’s energy in a process called photosynthesis.
(e) A spoonful of salt dissolves in a bowl of soup.
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