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.
1. The density of silver is 10.5 g/mL and that of gold is 19.3 g/ml. What volume of gold (in mL) has the same mass as 25.0 mL of silver?
2. An automobile uses gasoline at a rate of 35 miles/gallon. Express these units in meters/milliliter. (Note: 1 km = 0.6214 miles; 1 gallon = 3.78 L)
3. Which of the following is the LOWEST possible temperature? (HINT: Convert to
the SAME units to compare)
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37 oC
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54 oF
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313 K
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395 K
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All of these temperatures are equal.
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