Questions and Answers
What is the atomic number of the hypothetical element with an electron configuration of 1s22s22p63s23p5?
Which biomolecules are excluded from being made of the same set of monomeric units?
When radium undergoes alpha decay, what type of atom is formed?
Which scenario is a correct application of Boyle’s Law?
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What can be inferred about the properties of liquid A compared to liquids B and C?
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Which of the following illustrates a physical change?
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Why do farmers burn rice straw and hull during harvest?
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What is the main result when an antacid tablet is dissolved in water?
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What primary reaction results in acid rain?
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Why is atmospheric nitrogen hard to assimilate into the nitrogen cycle?
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Which statement about the greenhouse effect is incorrect?
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Why would a gardener cover a cutting with a perforated polythene bag?
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Which biogeochemical cycle is linked to the increase in mushroom growth after lightning strikes?
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Which factors contribute to a rise in human population?
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What would occur if all snakes in a food web are eliminated?
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What role do mushrooms play in the ecosystem after a lightning strike?
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Study Notes
Element Identification
- The hypothetical element with an electron configuration of 1s²2s²2p⁶3s²3p⁵ has an atomic number of 17, placing it in Group VIIA (or Group 17), called the Halogens.
- It is located in the third period of the periodic table and at the third position in the p-block.
Biomolecules in Organisms
- All organisms are composed of biomolecules, primarily proteins, carbohydrates, nucleic acids, and lipids.
- Lipids and fats differ as they are not derived from the same set of monomeric units.
Alpha Decay of Radium Isotope
- Radium (Ra) with atomic number 88 undergoes alpha decay to produce a Radon (Rn) atom with atomic number 86 and a total of 222 nucleons (86 protons, 136 neutrons).
Boyle’s Law Application
- Boyle's Law illustrates the inverse relationship between pressure and volume in gases.
- A scuba diver experiences pressure changes when ascending and descending in water, demonstrating this principle.
Liquid Properties
- Liquid A, which floats over liquids B and C and flows the fastest, is least dense and least viscous among the three.
Physical Changes
- Melting of frozen mango juice at room temperature represents a physical change, as the substance remains the same despite a change in state.
Rice Straw and Hull Burning
- Farmers burn rice straw and hulls primarily to increase space for new crops, as the ashes produced enrich the soil with nutrients.
Acid Rain Formation
- Acid rain occurs when sulfur released from burning fossil fuels combines with water in the atmosphere, forming sulfuric acid.
Nitrogen Cycle Integration
- Difficulty in integrating atmospheric nitrogen into the nitrogen cycle arises from the fact that few organisms can utilize nitrogen gas directly.
Greenhouse Effect Misconceptions
- Greenhouse gases do not absorb the green region of sunlight; they primarily trap heat and are crucial for maintaining Earth's temperature.
Plant Propagation Techniques
- Covering cuttings with a perforated polythene bag helps reduce their water demand by creating a microenvironment that retains moisture.
Lightning and Mushroom Growth
- The nitrogen cycle facilitates mushroom growth following lightning strikes due to the availability of nitrogen compounds produced during the electrical discharge.
Human Population Factors
- Factors contributing to increased human population include immigration and natality rates, while emigration and mortality rates decrease it.
Food Web Dynamics
- If all snakes are eliminated from a food web, the populations of grass and grasshoppers would likely increase due to reduced predation pressure, affecting the overall ecosystem balance.
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Description
Test your understanding of electron configurations in this quiz focused on the periodic table. Identify the properties of a hypothetical element with a specified electron configuration and determine its correct placement. This quiz will enhance your grasp of atomic structure and group classification.
