Phys Sci Chapt 5 Word Scramble
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| Question | Answer |
| 5.1 Organizing the Elements 1. How did Mendeleev organize the elements in his periodic table? | Into rows in order of increasing mass-elements with similar properties were in the same column. |
| 2. What evidence helped verify the usefulness of Mendeleev's table? | The match between Mendeleev's predictions and the actual properties of the new elements. |
| 5.2 The Modern Periodic Table 3. How is the modern periodic table organized? | Elements are arranged by increasing atomic number (# of protons). Each row on the table is a period. Each column is a group. |
| 4. What does the atomic mass of an element depend on? | The distribution of an element's isotopes in nature and the masses of those isotopes. |
| 5. What categories are used to classify elements on the periodic table? | Elements are classified as metals (good conductors of electric current and heat), nonmetals (bad conductors of electric current and heat) and metalloids (properties fall BETWEEN those of metals and non0metals). |
| 6. How do properties vary across a period in the periodic table? | The elements become less metallic and more non-metallic in their properties. |
| 5.3 Representative Groups 7. Why do the elements in a group have similar properties? | Elements in a group have similar properties because they have the same number of valence electrons. |
| 8. What are some properties of the "A" groups in the periodic table? | The alkali earth metals in Group 1A are extremely reactive. The reactivity of these metals increases from the top of the group to the bottom. |
| 5.3 Assessment: Reviewing Concepts 9. Explain why do elements in a group have similar properties? | Because they have the same number of valence electrons. |
| 10. What is the relationship between an alkali metal's location in Group 1A and its reactivity? | The reactivity of alkali metals INCREASES from the top of Group 1A to the bottom. |
| 11. What element exists in almost every compound in your body? | Except for water, MOST of the compounds in your body contain CARBON. |
| 12. Which Group 5A elements are found in fertilizer? | Besides nitrogen, fertilizers often contain phosphorus. |
| 13. Which group of elements is the least reactive? | The elements in Group 8A, noble gases, are colorless and odorless and extremely unreactice. |
| 14. Why is hydrogen located in a group with reactive metals? | It is a non-metal gas that seems to have more in common with the non-metals in Group 17. |
| 15. What biological function requires magnesium? | The process that uses sunlight to produce sugar in plants. |
| 16. Why is aluminum recycled? | The energy needed to purify recycled aluminum is only about 5 percent of the energy needed to extract alluminum from bauxite. |
| 17. What is the main use of sulfur? | About 65 % of the sulfuric acid produced is used to make fertilizers. |
| 18. Why is chlorine added to drinking water? | It is used to kill bacteria. |
Created by:
Ari Melincoff-Levy
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