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Chemistry 3

Chemistry Test

QuestionAnswer
Why do chemical reactions occur? Atoms want to be stable and need a full outer shell to become stable.
What is a homogeneous mixture? Give an example. A mixture in which the different materials appear to be the same (state, shape, size) making it difficult to tell them apart. An example is salt water.
What is a heterogeneous mixture? Give an example. A mixture in which the materials appear to be different (state, shape, size). An example is cereal and milk.
What is an ionic bond? a bond that is created from the transfer of one or more electrons from one atom over to the next atom
What is a covalent bond? when atoms share electrons
What is a compound? A substance made of two or more different kinds of atoms that are chemically bonded together
Can compounds be separated by a physical process? Explain. No. Compounds cannot be separated by a physical process because they are chemically bonded.
Define physical properties can be observed or measured without changing the composition of matter.
Give three examples of physical properties. change of state, malleability (capable of being shaped or formed), luster, conductivity, shape, size, texture, color, boiling point, solubility, and many others.
Define chemical properties. describes the potential to undergo some chemical change or reaction
What is always true about chemical changes? Something new is being formed by bonds being formed or broken.
Give an example of chemical properties. Flammable, reactive
What do families or groups tell us about the element? The number of valence electrons
What are valence electrons? The number of electrons in the outer shell
What do periods tell us about the element? the number of shells the element has
Where are families or groups on the periodic table? Columns
Where are the periods located on the periodic table? Rows
Know how to write chemical formulas for compounds Remember that + means the element wants to give an electron(s) and - means the element wants to take an electron(s) refer to page 67
What is the conservation of matter? matter cannot be created or destroyed (pg 72)
Define an element. Give an example. A substance made up of all the same atoms (found on periodic table). An example is gold.
Define solution.Give an example. A mixture in which a solid has dissolved in. Am example is Kool-Aid.
Define mixture.Give an example. A collection of substances that are NOT bonded together. An example is air.
Know how to identify the number of atoms in a compound. refer to page 47 and 59
Know how to identify the number of elements in a compound. count the number of capital letters
What is a polyatomic ion bond? A compound that has both ionic and covalent bonds
The metals are to the ___________ of the stair step. left
The nonmetals are to the ___________ of the stair step. right
In general, when a metal bonds with a nonmetal, it forms what type of bond? ionic
In general, when a nonmetal bonds with a nonmetal, it forms what type of bond? covalent
Be able to draw a Bohr's diagram to represent an element. page 50-51
Know how to balance chemical equations. Remember that the reactants needs to be balanced with the products (same number of atoms need to be on each side; conservation of matter). Refer to pages 73-75, 77
Created by: kallayj