12) 12) 5 gallons is equal to A) 10 quarts. B) 20 C) 5 D) 40 13) 13) The closest number of grams that is equivalent to 0.745 lb is A) 1.64 x 10-3 B) 0.338 C) 338 D) 3.379 14) 14) 20.5 g of a liquid has a volume of 15 mL. What is the density? B) 1.36 g/mL C) 1 g/mL A) 1.4 g/mL D) 1.3 g/mL 15) A popular science demonstration is to take several liquids that will not mix together and "stack" these liquids in a tall glass cylinder. Suppose the following three liquids were placed in the same tall, narrow glass cylinder: 15) SUBSTANCE DENSITY g/mL vinegar 1.01 motor oil 0.87 corn syrup 1.36 The substance that should be placed first in the cylinder so that it is on the bottom is A) vinegar C) motor oil B) corn syrup D) cannot be determined
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.
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