CIDESCO 141 Questions With Complete Solutions

Characteristics of life include: CORRECT ANSWERS: Growth and metabolism Example of organic biological substances are: CORRECT ANSWERS: Carbohydrates and fats Examples of mineral substances are: CORRECT ANSWERS: Paraffin's and petroleum Matter is everything that: CORRECT ANSWERS: Occupies space and has weight What property does all matter have? CORRECT ANSWERS: All matter has weight Sublimation is the change of matter from: CORRECT ANSWERS: A solid to a gas The alternation of the properties of matter without formation of any new substances is called? CORRECT ANSWERS: Physical change The immediate change of a solid into vapour is called? CORRECT ANSWERS: Sublimation An example of a single called cellular organism is? CORRECT ANSWERS: A bacterium Examples of bacteria are? CORRECT ANSWERS: Bacilli and cocci Which of the following belongs to the science of chemistry? CORRECT ANSWERS: The alternation of the structure of molecules An electrolyte is? CORRECT ANSWERS: A substance which, dissolved in water and splits into ION's Example of electrolytes are? CORRECT ANSWERS: Acids and salts An example of an electrolyte is? CORRECT ANSWERS: Salt solution An acid is an electrolyte because? CORRECT ANSWERS: It can conduct an electrical current An example of an inorganic acid is? CORRECT ANSWERS: Sulphuric acid An alkali must contain? CORRECT ANSWERS: Metal atoms and hydroxyl groups If metal oxide is dissolved in water it forms? CORRECT ANSWERS: An alkali PH can be decreased by? CORRECT ANSWERS: Increasing hydrogen ions pH is? CORRECT ANSWERS: The number of free H ions in a solution The pH of the skins acid mantle is? CORRECT ANSWERS: 5.5