Test
AQA GCSE Chemistry Unit 2.4
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Preguntas del test (20)
1How can we measure the rate of a chemical reaction?
- AMeasure the mass of products formed and the time taken
- BMeasure the mass of reactants formed and the time taken
- CUse a device which measures rate
- DWe cannot measure the rate of a reaction
2True or false? The rate of reaction can be found by the equation time/amount of reactant used or product formed.
- AVerdadero
- BFalso
3Which theory states that reactions can only occur if reactants come into contact with one another?
- AContact theory
- BCollision theory
- CRutherford's theory of reaction
4True or false? The activation energy is the smallest amount of energy needed for a reaction to take place.
- AVerdadero
- BFalso
5Which factor increasing reaction rate would explain why a powder reacts more quickly than a lump of solid?
- ATemperature is higher
- BConcentration/Pressure is higher
- CThere is a catalyst
- DSurface area is larger
6Why do particles at high temperature react more frequently?
- AThey are closer together
- BThey collide more frequently
- CThere are more exposed particles to react
- DThey collide with more energy
7True or false? If the reaction conditions are increased by 10°C, the rate of reaction will double.
- AVerdadero
- BFalso
8True or false? Increasing the pressure lowers the rate of reaction as there are fewer particles in a given space.
- AVerdadero
- BFalso
9Which of these is likely to have the highest rate of reaction?
- A1M H2SO4 + 1M KOH
- B2M H2SO4 + 1M KOH
- C0.5M H2SO4 + 1M KOH
10True or false? Catalysts can only be used once.
- AVerdadero
- BFalso
11What do catalysts do to speed up the rate of reaction?
- ALower the activation energy
- BProvide an alternative route for the reaction
- CGive the particles more energy
- DCause particles to collide more frequently
12Which of these are being developed as potential new catalysts?
- ANanoparticles
- BPolymers
- CEnzymes
- DCarboxylic acids
13True or false? Although transition metals are useful catalysts, their compounds are often toxic.
- AVerdadero
- BFalso
14True or false? Exothermic reactions make the surroundings colder.
- AVerdadero
- BFalso
15Which of these are exothermic reactions?
- ACombustion
- BRespiration
- CPhotosynthesis
- DNeutralisation
- EThermal decomposition
16Which of these are endothermic reactions?
- ACombustion
- BRespiration
- CPhotosynthesis
- DNeutralisation
- EThermal decomposition
17True or false? A reversible reaction which is exothermic in the forward direction is exothermic in the backward direction.
- AVerdadero
- BFalso
18True or false? Reversible reactions have exactly the same amount of energy lost or gained in both directions.
- AVerdadero
- BFalso
19Which of these is an application of exothermic reactions?
- AChemical cold packs
- BHand warmers
20Which of these is an application of endothermic reactions?
- AChemical cold packs
- BHand warmers
Información
- Descripción
- Twenty questions on the fourth section of Unit 2 in AQA GCSE Chemistry: Rates and energy.
- Autor
- Matthew T
- Idioma
- English
- Visitas
- 511
- Etiquetas
- Valoración
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