Chapter 6- Chemistry In Biology

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Chapter 6- Chemistry In Biology

Chapter 6- Chemistry in biology


A chemical reaction is when two or more atoms combined and create a entirely new substance. To know if a chemical reaction has taken place you should look for heat or light and the formation of a gas, liquid or solid. A chemical equation is the formula that shows how a chemical reaction took place. On the left are the starting substance, the right is the product and the arrow represent energy or react to form. Most chemical reactions can't accour without energy. The minimal amount of energy needed to start a chemical reaction is called the activation energy. When a chemical reaction takes place it is eather an exothermic, releases heat, or endothermic, absorbes heat. This is decided on weather the energy of the final project is higher or lower than the energy of the reactants. An enzymes is a substance that makes the chemical reaction speed up because by lowering the activation energy.


An atom is a particle that builds up everything that has matter, also known as the building blocks of life. Each atom is up as even smaller particles known as protons(positive charged particals), neutrons(particals with no charge) and electrons(negatively charged particals). Compounds are when two or more atoms combined to create a new substance. When an atom either wants an electron or wants to get rid of an electron if will combined in a chemical bonds. There are two types of chemical bonds. Covalent bonds or ionic bonds. A covalent bond is when two atoms share an electron. And an ionic bond is when an atom eather has an electron stollen from them or they give an electron away.


Large molecules that are made by combining with smaller molecules are called macromolecules. And polymers are when molecules keep repeating units of identical or almost identical compounds linked together. Lipids are molecules that make up the fats, oils and waxes. The primary function of lipids is to store energy. Saturated fates are lipids that have tail chains with only a single bond between the carbon atoms. Unsaturated fats are lipids that have a double bond between carbon atoms in the tail chain. Proteins make up 15% of your your total weight. Proteins serve almost every function in your body. Muscle,skin and hair are all proteins.


Water is a covalent bond that links two hydrogen atoms and one oxygen atom. Water is known as the universal solvent and it provides the enviroments suitable for life, it also helps organisms maintain homeostasis. Water becomes more dence as it cools but it still floates on water because it is less dence than water. There is a scale that measures acids and baces, with water in the middle. The chart is on which is called the pH scale. Acids are substances that releace (H+) when dissolved in water. A base is a substance that releaces (OH-) when dissolved in water. On the chart acidic solutions have an abundance ions and pH values ower than 7. Basic solutins have an abundance ions and pH higher than 7.


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