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8th Chemical Bond
8th Grade Chemical Bond Study Guide
| Question | Answer |
|---|---|
| Chemical bonds always involve _____. | electrons |
| The ratio of elements in a given compound ____, | is always the same |
| There are millions of unique substances in the universe because elements can combine in many different ways to form ___. | compounds |
| In all covalent bonds, valence electrons are ____. | shared |
| Which alloy was made first? | bronze |
| Ionic bonds form between ____. | a metal and a nonmetal |
| Metals are used to make electric wires because metals ___. | are ductile and have freely moving electrons |
| When halogens form ions they ____. | become negative in charge |
| In a given metals group of the periodic table, compared with elements closer to the top of the table, elements closer to the bottom ____. | have valence electrons that are farther from the nucleus. |
| In metallic bonds, the force of attraction is between ___. | ions and electrons |
| An alloy of iron and carbon is | known as steel. |
| Chemical bonds form when atoms ____. | share or transfer electrons |
| An ionic bond forms when atoms of a nonmetal give up electrons to atoms of a metal. (T or F) | False |
| The bonds of crystals are very week. (T or F) | False |
| Metals can be shaped into thin sheets. ( T or F) | True |
| Bronze has been used for thousands of years. ( T or F) | True |
| Metallic bonds form between metals and nonmetals. (T or F) | False |
| The same elements may form different compounds.n (T or F) | True |
| The types of bonds in chemical compounds determine many of their properties. (T or F) | True |
| A molecule of carbon monoxide has two carbon atoms and one oxygen atom. (T or F) | False |
| Covalent bonds form only between atoms of different elements. (T or F) | False |
| Sharing electrons allows atoms to have a full outer energy level. (T or F) | True |
| Chemical compounds are represented by chemical formulas. (T or F) | True |
| The "3" in NH3 is the atomic number of hydrogen. (T or F) | False |
| A (n) ________ is formed by melting a metal and dissolving other elements in it. | alloy |
| A structure formed by metallic bonding is known as a (n) _____. | lattice |
| A (n) ______ bond is a weak bond that forms between oppositely charged ends of nearby molecules. | hydrogen |
| The force of attraction that holds together oppositely charged ions a (n) ____. | ionic bond |
| The symbol used to represent a chemical compound is referred to as a (n) ____. | chemical formulas |
| A unique substance that forms when elements combine chemically is a (n) ___. | chemical compound |
| The force of attraction between a metal ion and surrounding electrons is a (n) ___. | metallic bond |
| Any compound consisting of two or more nonmetals is a (n) ____ compound. | covalent |
| A dissolved ionic compound is called a (n) ___. | electrolytes |
| A unique substance that forms when elements combine chemically is called a (n) ____ | compound |
| A charged particle that forms when an atom gains or loses electrons is a (n) _____. | ion |
| Elements that can conduct electricity are classified as ____. | metals |
| Why are metals good conductors of electricity ? | because metals have free moving electrons and electricity is moving electrons. |
| Compare and contrast ionic and covalent bonds. | They are both created due to atoms chemically bonding and valence electrons interacting with each other. Ionic bonds are created when a metal chemically bonds with a nonmetal and covalent bonds form when a nonmetal chemically bonds with another nonmetal. |
| Describe the role of valence electrons in chemical bonding. | Valence electrons are the only electrons involved in chemical bonding. They are willing to be shared or transferred. |
| Why do ionic compounds always include a metal and a nonmetal? | because metals often easily give up electrons and nonmetals often accept electrons, If an atom loses an electron it becomes positively charged and if an atom gains an electron it becomes negatively charged. Opposite charges are attracted and bond, |
| Explain why covalent compounds have a lower melting points than ionic compounds. | It takes less energy for individual molecules to be broke apart than it does to break apart the ions in a crystal. As a result, the molecules in covalent compounds have lower melting and boiling points than the crystals in ionic compounds |
Created by:
cromine