Crostic Chemistry Level 2 answers

Chemistry Level 2

Unlike many substances, water expands as it freezes. An ice cube takes up about 9% more volume than the water used to make it. Water molecules in the liquid state like hanging out together as droplets, but in the solid (frozen) state, they need their space. A water molecule is similar in outline to Mickey Mouse, with two hydrogen atoms placed on one end of an oxygen atom. The oxygen atoms are positively charged and hydrogen atoms negatively charged, so water molecules stick to each other like tiny magnets. The hydrogen "ears" make loose bonds, called hydrogen bonds, with the oxygen "faces" of other water molecules. Each molecule of water is made of two hydrogen atoms and one oxygen atom. The hydrogen atoms are not placed on opposite sides of the oxygen atom; they occur at one end. In ice crystals, their hydrogen bonds link them together like acrobats, stacked one on top of the other, with their arms and legs outstretched. This provides more space between the molecules in the crystal structure of ice than the molecules of liquid water. As a result, ice is less dense than the liquid form. Water is the only known non-metallic substance that expands when it freezes. Unlike many substances

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