Hl Girls Chemistry (Quiz 2) 5/4

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| By Osama Orabi

Osama Orabi

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Quizzes Created: 1 | Total Attempts: 181

Questions: 29 | Attempts: 182 | Updated: Mar 19, 2023

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Chemistry Quiz5/4/2020High Level Academy

Questions and Answers

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TAP the correct answer
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C. C
16.

When burning methane gas two products form; carbon dioxide and ________

Correct Answer
water,h2o

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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4
17.

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

Correct Answer
decreases,decrease

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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4
18.

Which reaction is faster? (P or Q) ________

Correct Answer
Q,q

Explanation
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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4
19.

∆H of the reaction is ________ kJ/mol

Correct Answer
103

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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21.

The minimum energy needed to start the reaction is ________ (∆H, Ea or enthalpy)?

Correct Answer
Ea,ea

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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