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.
3. Calculate the mass of a piece of a lead that has a volume of 24.65 cm3. Density of lead is 11.3 g/cm3.
4. Calculate the density of an unknown solid if it has a mass of 23.3 g and a volume of 12.4 mL.
5. A child needs an antibiotic to treat an infection. The antibiotic is available as 28 mg/tablet. The dose of antibiotic is 5.4 mg/kg body weight. The child weighs 83.6 lbs. How many tablets does the child need? 1 kg = 2.20 lbs. Round to the nearest tablet.
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