Length is measured with a metric ruler. Part ofa combined metric and inch ruler is shown In Figure B. On the metric side of the ruler the distance between numbered Hines is equal to one centimeler. Bach centimeter is divided into 10 equal parts. Bach one of these parts is equal to ane millimeter. The figure below shows a combined metric and inch ruler. NCHES Figure B 1. What value does the prefix milli- stand for? 2 What value does the prefix centi- stand for? 3. Which is larger, a meter or a millimeter? 4 How many millimeters make 1 centimeter? 5. The length at A may be written as 45 mm. It may also be written as S cm, 45 cm, 4.5 mm 6. The length at B may be written as. mm or cm.
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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