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Chemistry Quiz 2
| Question | Answer |
|---|---|
| What does the group on the periodic table tell you about an element? | The group number represents how many valence electrons an atom of an element has. |
| What do the periods of the periodic table tell you about an element? | The number of the period represents how many electron shells (energy levels) an atom of an element has. |
| How many valence electrons does Arsenic have? | 5 valence electrons |
| How many electron shells does Gold have? | 6 electron shells |
| What charge does a neutron have? | No charge |
| An electron is a ______________ charged particle. | negatively |
| A proton is a _________________ charge particle. | positively |
| Elements in the halogen family (group 7) react easily with elements in the Alkali Metals (group _____ ). | 1 |
| When oxygen combines with vermiculite, the temperature increases drastically. This is an example of a(n) endothermic or exothermic reaction. | exothermic- releases heat |
| When two atoms of oxygen bond with one atom of carbon describe the type of bond formed. | This is a bond between two non-metals so it is covalent. The carbon atom is sharing two electrons with each atom of oxygen to complete all outer shells. |
| All atoms are trying to achieve _______________. | stability- a full outer shell of electrons |
| Phosphorus is a non-metal. This means when forming an ionic bond it will _____________ electrons. | take |
| Lithium is a metal. This means when forming an ionic bond it will ____________ electrons | give |
| What is a valence electron? | An electron in the outermost shell of an atom. |
| An ionic bond forms only between ____________ and _________. | metals and non-metals |
| What is an ion? | A charged particle (could be positive or negative) expressed in an oxidation number |
| If an atom becomes an ion by giving away an electron it becomes _____________ charged. | positively charged (it has more protons than electrons) |
| If an atom becomes an ion by taking an electron to fill its outer shell it becomes ____________ charged. | negatively charged (has more electrons than protons) |
| When an atom does not have a charge what does this mean? | The atom has the same number of protons and electrons, so the positively charged protons and negatively charged electrons cancel each other out resulting in no charge. |
| What is an ionic bond? | A metal gives away electrons to a non-metal, creating ions of opposite charges causing the ions to attract to one another. |
| What is a covalent bond? | Two non-metals share valence electrons to fill their outer shell. |
| The bond between two oxygen molecules would be considered a __________________ bond. | covalent (double bond) |
| Noble Gases do not react with other elements because..... | they already have a full outer shell of electrons (they are stable). |
| Draw a Bohr's Model for Carbon. | model should have 6 protons, 6 neutrons written in nucleus, 6 electrons, 2 electron shells (4 valence electrons) |
| Draw a Bohr's Model for Magnesium. Draw a Bohr's Model for Chlorine. How many Chlorine atoms would it take to make a molecule of the compound Magnesium Chloride? | Magnesium model should have 12 protons, 12 neutrons, 12 electrons, 3 electron shells (2 valence electrons) Chlorine model should have 17 protons, 18 neutrons, 17 electrons, 3 electron shells (1 valence electron) It would take two chlorine atoms. |
| How many electrons would two atoms of Sulfur have to share to form a covalent bond? | two (both need two so they can share two of their electrons to fill the shell of the other atom. |
| How many atoms are in this compound 4K2CO3? How many elements? | 24 atoms - K2CO3 has 6 atoms in one molecule, but the 4 in front tells you there are 4 molecules so 6 x 4 = 24 total atoms. 3 elements |
| How many atoms? How many elements? 4Al(OH)3 | 28 atoms - two atoms in the parentheses multiplied by 3 gives you 6, plus 1 atom of aluminum gives you 7, times 4 = 28 3 elements |
| How many atoms? How many elements? Ba(MnO4)2 | 11 atoms- 5 atoms in the parentheses multiplied by 2 gives you 10, plus 1 atom of barium = 11 3 elements |
| What is the name of the electrons in the highest (outermost) energy level of an atom? | valence electrons |
| The ion Ag⁺1 bonds with ion O⁻2. What is the chemical formula? | Ag2O |
| Describe the exchange of electrons when one atom of sulfur forms a chemical bond with an atom of calcium. | Magnesium is a metal so it gives two electrons to the atom of sulfur, which is a non metal. Because this is a bond whnere electrons are exchanged between a metal and non metal, this is an ionic bond. |
| Draw a Lewis Dot Diagram of oxygen. | You should have the symbol "O" surrounded by 6 dots because oxygen has 6 valence electrons. |
| Draw the chemical bond (Lewis Structures) between oxygen and carbon to form the compound carbon dioxide. What type of bond is this? | covalent bond (two non metals).... You should have one carbon atom and two oxygen atoms. Each carbon should share two electrons with each of the oxygen atoms (double bonds) |
| Ca(OH)2 How many elements are in this compound? How many total atoms? | 3 elements 5 total atoms (1 Calcium, 2 Oxygen, 2 Hydrogen) |
| If a substance has a pH of 0-6.9 it is considered to be... | acidic |
| If a substance has a pH of 7-7.9 it is considered to be.... | neutral |
| If a substance has a pH of 8 -14 it is considered to be.... | basic / alkaline |
Created by:
Mrs.Koch