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Science test
Chapter 16
| Question | Answer |
|---|---|
| Which of the following is a covantetly boned molecule? Cl_2 , air , Ne , salt | Cl_2 |
| What is the number of the group in which the elements have a stable outer energy level? 1 , 13 , 16 , 18 | 18 |
| Which term describes the units that make up substances formed by ionic bonding? Ions , molecules , acids , atoms | Ions |
| Which of the following describes what is represented by the symbol Cl-? An ionic compound , a polar molecule , a negative ion , a positive ion | A negative ion |
| What happens to electrons in the formation of a polar covalent bond? They are lost , they are gained , they are shared equally , they are shared unequally | They are shared unequally |
| Which of the following compounds is unlikely to contain ionic bonds? NaF , CO , LiCl , MgBr_2 | CO |
| Which term describes the units that make up compounds with covalent bonds? Ions , molecules , salts , acids | Molecules |
| In the chemical formula CO_2,the subscript 2 shows which of the following? There are two oxygen ions , there are two oxygen atoms , there are two CO_2 molecules , there are two CO_2 compounds | There are two oxygen atoms |
| Which is NOT true about the molecule H_2_O? It contains two hydrogen atoms , it contains one oxygen atom , it is a polar covalent bond , it is an ionic compound | It contains one oxygen atom |
| Explain why groups 1 and 2 form many compounds with Groups 16 and 17. | Elements in groups 1 and 2 lose one or two electrons easily. Elements in Groups 16 & 17 gain one or two electrons easily. |
| Analyze what salt dissolves in water,the sodium and chloride ions separate. Explain why they occur. | The positive ends of a polar water molecules are attracted to the chloride ions and pull them out of the solid. The negative ends of the polar water molecules are attracted to the positive sodium ions and pull them out of the solid. |
| Interpret Data both cesium,in period 6,and lithium,in period 2,are in the alkali metals family. Cesium is more reactive. | The outer electron in cesium in farther from the nucleus and is therefore more easily removed from the atom making cesium more reactive. |
| A helium atom has only two electrons. Why does helium behave as a Noble gas? | The lowest energy level can contain only two electrons. Since this energy level is helium's outer level,it is full with two electrons. |
| A sample of an element can be drawn easily into wire and conducts electrify well. What kind of bonds can you conclude are present? | The sample and have metallic bonds. |
| How many lithium atoms are needed to make the charges equal to zero? | Three lithium atoms are needed to make the charges equal to zero. |
| Atoms form bonds with other atoms using _____ in their outer energy levels. | Electrons |
| When _______ occurs,electrons are either gained or lost. (Metal + nonmetal ) | Ionic bonding |
| Metal tend to lose electrons to become _______. | Positive Ions |
| Nonmetals tend to gain electrons to become _________. | Negative ions |
| Metal + Nonmetal Positive (+) ions and negative (-) ions are formed. | Ions |
| Metal + Metal Formed when metals share pooled electrons. Bonding affects the properties of metals. | Metallic |
| Nonmetal + Nonmetal Share electrons. Neutral molecules are formed. | Covalent |
| 1. Formed by gaining or losing electrons 2. Ions are formed 3. Basic units is the ions 4. Metal + nonmetal | Ionic |
| 1. Formed by sharing electrons 2. Neutral positive (molecule) formed 3. Basic unit is the molecule 4. Nonmetal + nonmetal | Covalent |
| A ____ is a pure substance containing 2 or more elements that are chemically hooked. | Compound |
| A ____ is the basic unit of a molecule compound. It is the neutral parted formed when atoms share electrons. | Molecule |
| Molecules that do not have uneven charges are called ______ or bonds. | Non-polar molecules |
| An element is stable with eight electrons in its ______. | Outer energy level |
| The closer a ______ is to the nucleus,the stronger the attractive force. | Electron |
| An atoms _____ contains it's protons and neutrons. | Nucleus |
| A ______ model with dark bands representing energy levels shows where an atoms electrons are most likely to be. | Electron cloud |
| The chemical symbol for an element surrounded by as many dots as there are electrons in its outer energy level is called a ______. | Electron dot diagram |
| Columns in the periodic table are known as _______. | Element families |
| The number of electrons in a neutral atom increase by one as you go from left to right across a _______ in the periodic table. | Period |
| Each element has a different number of protons and electrons, so each has a different _________. | Atomic structure |
| Explain how the arrangement of electrons in an atom is related to the periodic table. | Elements that are all in the same period have the same energy levels. The group numbers tell you how many electrons are in the outer energy level. Period numbers tell you how many energy levels. |
| Force that holds two atoms together. | Chemical bond |
| Combination of chemical symbols and numbers that indicates which elements and how many atoms of each element are present in a molecule. | Chemical formula |
| A substance produced when elements combine and whose properties are different from each of the elements in it. | Compound |
| Chemical bond formed when atoms share electrons. | Covalent bond |
| Are where negativity charged electrons,arranged in energy levels,travel around an atom nucleus. | Electron cloud |
| Chemical symbol for an element, surrounded by as many dots as there are electrons in its outer energy level. | Electron dot diagram |
| The different positions for an electron a atom. | Energy level |
| Atom that is positively or negativity charged because it has gained or lost electrons. | Ion |
| Attraction that holds oppositely charged ions close together. | Ionic bond |
| Bond formed when metals share their pooled electrons. | Metallic bond |
| Neutral particle formed when atoms share electrons. | Molecule |
| Bond resulting from the unequal sharing of electrons. | Polar bond |
| The bond that forms between atoms when they share electrons. | Covalent bond |
| Force that holds two atoms together. | Chemical bond |
| An atom that is no longer neutral because it has gained or lost an electron. | Ion |
| A pure substance that contains two or more elements. | Compound |
| A neutral particle formed when atoms share electrons. | Molecule |
| An electron ____ is the chemical symbol for the element surrounded by as many dots as there electrons in its outer energy level. | Dot diagram |
| Number to the lower right on an element symbol indicating number of atoms of that element. | Subscript |
| The attraction that holds positive and negative ions together. | Ionic bond |
| A combination of chemical symbols and numbers that shows what a molecule is made of. | Formula |
| Molecule that does not have two opposite ends or poles. | Nonpolar |
| Molecule that has two opposite ends or poles. | Polar |
| Sodium chloride is an example of a _______ because it contains two or more elements. | Compounds |
| An ionic compound,salt is a hard,crystalline substances in which the _______ and _______ Ions are lined up in a regular pattern. | Sodium-positive Negative-positive |
| At the center of an atom is a _____ that contains one or more positively charged _______ and neutral __________. | Nucleus Protons Neutrons |
| Electrons that are closet to the atoms nucleus are in the _______ energy level. | Lowest |
| When two atoms share an electron unevenly and one of the atoms has as light negative charge as a result,their bond is referred to as a ______, | Polar |
| If there is a balanced sharing of electrons and neither atom has a slight negative or positive charge,their bond is referred to as a _______. | Nonpolar |
| The chemical formula CO_2 represents a molecules that contains one atoms of ______ and ______ atoms of oxygen. | Carbon Two |
| Describe how electron dot diagrams can be used and why they are helpful. | Electron dot diagram are very useful because they show us the number of electrons in outer energy levels of an element. Chemical properties depend on this atomic structure. |
| Describe how elements form ions that have a stable atomic structure like that found in a Noble gas. | Elements can grow the stable atomic structure of a Noble gas by either aging or losing electrons. |
| Describe what would happen if a positively charged sodium ion and a negatively charged chlorine ion came into contact. | The two atoms would form an ionic bond creating the compound sodium chloride-table salt. |
| Explain why a stairway is a good model for the energy levels in an atom. | Stairway is a good model because each energy level can be represented as a step is the lowest energy level and the electrons are close to the nucleus. |
| How does a polar bond differ from a non polar bond? | In a nonpolar bond,electrons are shared equally my atoms and a polar bond,electrons are shared unequally. |
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