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Science Test

Chapters 8, 9, 10

QuestionAnswer
What is a mixture Two or more elements not chemically bonded together
What is a compound two or more elements chemically bonded together
What is ionic bonding a bond that transfers an electron from one atom to another resulting in attraction between oppositely charged ions
What is covalent bonding a chemical bond formed by shared electrons
Magic number valence electrons for chemical bonding if atomic number is less than 5, it is 2 if it is more than 5, it is 8
Why is chemical bonding important almost all of the matter around us is formed by chemical bonds
ph scale for acids, bases, and neutral 1-6 strong acid 8-14 strong base 7 - neutral
properties of an acid sour, reacts with metals, turns blue litmus paper red, turns phenol red yellow
properties of a base bitter taste, slippery feel, turns red litmus paper blue
pH in the environment and bodies the nutrients plants get are affected by the pH of soil and too much pH can be toxic to plants. Aquatic life is also affected.
what is a physical change a substance changes form but remains the same substance
what is a chemical change turns one or more substances into different substances with different properties
what are properties of reactants reactants are substances that are combined and changed in a chemical reaction
what are properties of products new substances which result from a chemical reaction
what is an exothermic reaction a reaction that releases more energy than it uses
what is an endothermic reaction a reaction that uses more energy than it releases
what is conservation of mass the total mass of the reactants is equal to the total mass of the products because they are the same atoms
Popular Physical Science sets

 

 



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