Test
Rates of Reactions
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Preguntas del test (12)
1The rate of reaction depends on
- AFrequency of collisions between particles and energy of their collisions
- BFrequency of moving electrons
- CAmount of reactants used
2How do you calculate rates of reactions?
- Atime taken for change /change in reactant or product (x/y)
- Bchange in reactant or product/ time taken for change (y/x)
3A factor affecting the rate of reaction is increased temperature.
- AVerdadero
- BFalso
4Factors affecting the rate of reaction include
- Astate, temperature and surface area, use of catalyst
- Bvolume of reactant, pressure and temperature, use of catalyst
- Ctemperature,concentration or pressure, surface area, use of catalyst
5At a [blank_start]higher[blank_end] concentration, there is [blank_start]more[blank_end] particles in the same amount of space. This means the particles are more likely to collide and therefore more likely to [blank_start]react.[blank_end]
- Ahigher
- BLower
- Cmore
- Dlower
- Ereact.
- Fnot react.
6As the pressure increases, the space in which the gas particles are moving becomes
- Asmaller
- Bbigger
7The gas particles become closer together as the pressure increases causing less frequent collisions. This means the particles are less likely to react.
- AVerdadero
- BFalso
8Catalysts are substances that increase the rate of reaction without being used up in the reaction. Catalysts never produce more product - they just produce the same amount of energy more quickly.
- AVerdadero
- BFalso
9Catalysts work by
- Aincreasing activation energy
- Bdecreasing activation energy
10Catalysts are important to industry because
- AProducts can be made slower, reduce the need for higher temperatures and they can be reused
- BProducts can be made quicker, reduce the need for higher temperature and they can't be reused
- Cproducts can be made quicker, reduce the need for higher temperature and they can be reused
- Dproducts can be made quicker, increase need for higher temperature and they can be reused
11Any reaction involving a solid can only take place at the surface of the solid. If the solid is spilt into several pieces, the surface area [blank_start]increases[blank_end]. This means that there is an [blank_start]increased[blank_end] area for the reactant particles to collide with. The smaller the pieces, the [blank_start]larger[blank_end] the surface area. This means [blank_start]more[blank_end] collisions and a [blank_start]greater[blank_end] chance of reaction.
- Aincreases
- Bincreased
- Clarger
- Dgreater
- Emore
12At a [blank_start]higher[blank_end] temperature, particles have [blank_start]more[blank_end] energy. This means they move [blank_start]faster[blank_end] and are more likely to collide with other particles. Also when the particles do collide they do so with more energy and so the number of successful collisions [blank_start]increases.[blank_end]
- Ahigher
- Bmore
- Cfaster
- Dincreases.
Información
- Descripción
- National 5 (Unit 1) Chemistry Test sobre Rates of Reactions, creado por Niamh Taylor el 14/12/2015.
- Autor
- Niamh Taylor
- Idioma
- English
- Visitas
- 89
- Etiquetas
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