Hl Girls Chemistry (Quiz 2) 5/4

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Quizzes Created: 1 | Total Attempts: 235
| Attempts: 235 | Questions: 29
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Hl Girls Chemistry (Quiz 2) 5/4 - Quiz


This quiz, titled 'HL Girls Chemistry (Quiz 2) 5/4', consists of multiple-choice questions designed to test knowledge in chemistry, specifically tailored for higher-level female students.

2. Collisions of gas particles (increase, decrease, stay the same) _____when decreasing the PRESSURE.

Explanation

When the pressure of a gas is decreased, the gas particles have more space to move around, resulting in a decrease in the frequency and intensity of collisions between the particles. As a result, the collisions of gas particles decrease when the pressure is decreased.

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13. Match the following
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14. The minimum energy needed to start the reaction is _____ (∆H, Ea or enthalpy)?

Explanation

The correct answer is Ea, which stands for activation energy. Activation energy is the minimum amount of energy required to start a chemical reaction. It is the energy needed to break the bonds of the reactant molecules and initiate the formation of new bonds in the product molecules. The lowercase "ea" is simply a variation of the abbreviation for activation energy.

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19. Which reaction is faster? (P or Q) _____

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Q,q is the faster reaction because it is written in lowercase letters. In chemistry, lowercase letters typically represent the rate constants for reactions, which determine the speed at which a reaction occurs. Therefore, Q,q indicates a faster reaction compared to P,p, which would be written in uppercase letters.

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22. When burning methane gas two products form; carbon dioxide and  _____

Explanation

When methane gas is burned, it reacts with oxygen to produce carbon dioxide and water (H2O) as products. This is a combustion reaction in which methane (CH4) combines with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). Water is formed due to the presence of hydrogen in methane combining with oxygen.

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27. Match the following
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28. Choose the best answer:

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29. ∆H of the reaction is _____ kJ/mol

Explanation

The given answer, 103 kJ/mol, represents the change in enthalpy (∆H) of the reaction. Enthalpy is a measure of the heat energy absorbed or released during a chemical reaction. In this case, the reaction has a ∆H value of 103 kJ/mol, indicating that it releases 103 kilojoules of heat energy per mole of reactant. This value can be used to calculate the heat transfer or energy change in the reaction.

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Collisions of gas particles (increase, decrease, stay the same)...
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Match the following
The minimum energy needed to start the reaction is _____ (∆H, Ea or...
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Which reaction is faster? (P or Q) _____
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When burning methane gas two products form; carbon dioxide and ...
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Match the following
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∆H of the reaction is _____ kJ/mol
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