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Grade 11 Chemistry Verified Solutions 1. Element - What is a substance made up entirely of one type of atom that cannot be chemically broken down into simpler substances? - Answer: An element is a pure substance composed entirely of one kind of atom that cannot be broken down into simpler sub...

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  • July 10, 2024
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  • 2023/2024
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Grade 11 Chemistry Verified Solutions
1. Element



- What is a substance made up entirely of one type of atom that cannot be chemically broken down


into simpler substances?



- Answer: An element is a pure substance composed entirely of one kind of atom that cannot be


broken down into simpler substances by chemical means.




2. Compound



- Describe a substance made up of atoms of more than one element combined in fixed proportions


that can be chemically decomposed.



- Answer: A compound is a pure substance composed of atoms of more than one element chemically


combined in fixed proportions, capable of being broken down into simpler substances by chemical


means.




3. Metal

, - What type of element is typically a good conductor of electricity, malleable, ductile, and has a shiny


appearance?



- Answer: A metal is an element characterized by its ability to conduct electricity, malleability, ductility,


and lustrous appearance.




4. SATP



- Define the conditions represented by SATP (Standard Ambient Temperature and Pressure).



- Answer: SATP refers to the standard conditions of temperature at 25°C and pressure at 100 kPA.




5. STP



- Explain what is meant by STP (Standard Temperature and Pressure).



- Answer: STP denotes standard conditions of temperature at 0°C and pressure at 101.325 kPA.




6. Empirical definitions

, - What type of definitions describe concepts based on observable properties?



- Answer: Empirical definitions are definitions that explain concepts in terms of observable properties.




7. Non-metal



- Describe an element that generally does not conduct electricity well and tends to be brittle.



- Answer: A non-metal is an element that typically does not conduct electricity well and is often brittle.




8. Metalloid



- What term describes elements located near the staircase line on the periodic table, exhibiting


properties of both metals and non-metals?



- Answer: Metalloids are elements located near the staircase line on the periodic table, displaying


properties that are intermediate between metals and non-metals.




9. IUPAC

, - What does the acronym IUPAC stand for, and what is its mission?



- Answer: IUPAC stands for the International Union of Pure and Applied Chemistry. Its mission involves


promoting international collaboration in chemistry and applying chemistry for the betterment of


humanity, while upholding scientific values, standards, and ethics.




10. Law of triads



- Explain Johann Dobereiner's principle of organizing elements into groups of three, where the middle


element had properties intermediate between the other two.



- Answer: The Law of Triads, proposed by Johann Dobereiner, grouped elements into triads where the


middle element exhibited properties that were intermediate between the other two elements in the


triad.




11. Law of Octaves



- Describe the pattern observed by John Alexander Newlands when arranging elements by increasing


atomic mass.

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