Podcast
Questions and Answers
How many moles of water molecules are there in a 1.5 L bottle?
How many moles of water molecules are there in a 1.5 L bottle?
83 moles
What is the difference between fusion and dissolution?
What is the difference between fusion and dissolution?
Fusion is a physical change of state from solid to liquid, while dissolution is the separation of a solid into its individual molecules by a solvent.
What is the energy transferred during the fusion of 250g of water?
What is the energy transferred during the fusion of 250g of water?
- 333 kJ
- 83.25 kJ (correct)
- 2257 kJ
- 564 kJ
Which one is the correct chemical equation for the combustion of glucose?
Which one is the correct chemical equation for the combustion of glucose?
Flashcards
String
String
A sequence of characters used to represent text.
String variable
String variable
A variable that can store a string.
String data type
String data type
A data type that represents text.
String concatenation
String concatenation
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String slicing
String slicing
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String searching
String searching
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String case conversion
String case conversion
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String trimming
String trimming
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String replacement
String replacement
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String conversion
String conversion
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Study Notes
Physical Transformations
- Physical transformations do not alter the chemical composition of a substance.
- Examples include: melting, freezing, vaporization, condensation, sublimation, and deposition.
- States of matter include solid, liquid, and gas.
Calculating Amount of Substance
-
To calculate the number of moles, use the formula: N = m/M, where:
- N represents the number of entities (molecules)
- m represents the sample mass (in kg)
- M represents the mass of a single entity (in kg).
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The number of Avogadro is a constant, NA = 6.02 × 1023 mol−1
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The number of moles (n) can also be found using n = N/NA
-
A 1.5L bottle of water contains approximately 83 moles of water molecules.
Chemical Transformations
- Chemical transformations involve the rearrangement of atoms to form new substances.
- These transformations are represented by chemical equations.
- A balanced chemical equation shows the number of atoms of each element on both sides of the reaction is equal.
Example Equation:
- C6H12O6 + 6O2 → 6H2O + 6CO2
- Glucose (C6H12O6) reacts with oxygen (O2) to produce water (H2O) and carbon dioxide (CO2).
Energy Changes in Transformations
- Endothermic transformations absorb heat from the surroundings.
- Exothermic transformations release heat to the surroundings.
- The quantity of energy transferred during a transformation is often expressed in joules (J)
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