Rates Of Reaction
Akopọ
Chemical reactions happen at different speeds. Fireworks explode in a fraction of a second, while iron rusts over months. Understanding what controls how fast a reaction proceeds is essential for industry, cooking, and everyday safety.
In this lesson you will explore the four key factors that affect reaction rate - surface area, concentration, temperature and catalysts. You will explain each factor using particle collision theory, describe practical investigations, and learn how catalysts provide an alternative pathway with lower activation energy.
Awọn Afojusun
- Describe experiments to investigate the effects of changes in surface area, concentration, temperature and catalysts on the rate of a reaction
- Describe the effects of changes in surface area, concentration, pressure, temperature and catalysts on the rate of a reaction
- Explain the effects of changes in surface area, concentration, pressure and temperature on the rate of a reaction in terms of particle collision theory
- Know that a catalyst is a substance that increases the rate of a reaction but is chemically unchanged at the end
- Know that a catalyst works by providing an alternative pathway with lower activation energy
- Investigate the effect of changing the surface area of marble chips and of changing the concentration of hydrochloric acid on the rate of reaction
- Investigate the effect of different solids on the catalytic decomposition of hydrogen peroxide solution
Àwòrán ọpọlọ
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Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Rates Of Reaction. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which factor does NOT affect the rate of a chemical reaction? A) Temperature B) Colour of the reactant C) Concentration D) Surface area Answer: B
- A catalyst increases the rate of reaction by: A) Increasing the temperature of the reaction B) Providing an alternative pathway with lower activation energy C) Increasing the concentration of the reactants D) Increasing the surface area of the reactants Answer: B
- In the disappearing cross experiment, what substance causes the solution to turn cloudy? A) Sodium chloride B) Sulfur C) Hydrogen chloride D) Sodium thiosulfate Answer: B
- When marble chips react with acid, the rate of gas production is fastest at the: A) End of the reaction B) Start of the reaction C) Midpoint of the reaction D) Rate stays constant throughout Answer: B
- According to collision theory, a successful collision requires particles to have: A) Any amount of energy B) Energy equal to or greater than the activation energy C) Energy less than the activation energy D) The same speed as each other Answer: B
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Factors Affecting Reaction Rates
Describe the effects of chemical nature, physical state, temperature, concentration, and catalysis on reaction rates
"Chemistry: Factors Affecting Reaction Rates" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/12-2-factors-affecting-reaction-rates. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Collision Theory
Use the postulates of collision theory to explain the effects of physical state, temperature, and concentration on reaction rates
"Chemistry: Collision Theory" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/12-5-collision-theory. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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