Gwyneth Cooper
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Year 10 Science quiz about rates of reactions with a combustion focus

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Gwyneth Cooper
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Rates of reactions

Pregunta 1 de 8

1

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For a chemical to take place, the particles must with enough energy and the right orientation to break the holding them together. Then the can rearrange themselves into new compounds.

Explicación

Pregunta 2 de 8

1

The rate of a reaction is the...

Selecciona una de las siguientes respuestas posibles:

  • Number of successful collisions per second

  • Number of particles that could react

  • Size of the container the reaction is in

  • Number of collisions that take place

Explicación

Pregunta 3 de 8

1

Which of these increase or decrease the rate of a reaction? (click as many as are needed - there are three factors listed in total)

Selecciona una o más de las siguientes respuestas posibles:

  • The temperature of the reactants

  • The weather outside

  • The concentration of the reactants

  • The quality of the reactants (that you bought them from a good shop)

  • The particle size

  • The size of the container

Explicación

Pregunta 4 de 8

1

Rellena los espacios en blanco para completar el texto.

Temperature is a measure of the energy that the particles have. The more heat energy particles have, the they move. This means that are more likely to have enough energy to break the in the reactants, so there will be more successful collisions per .

Explicación

Pregunta 5 de 8

1

What is concentration?

Selecciona una de las siguientes respuestas posibles:

  • It's the size of the container the reaction is in

  • It's the number of particles in a given volume or space

  • It's the number of collisions per second

Explicación

Pregunta 6 de 8

1

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the concentration increases the rate of the . Because there are more in the same space, there will be more collisions just because they're crowded together more. Because there are more collisions, the of the reaction will be faster.

Explicación

Pregunta 7 de 8

1

Which of these will react at the fastest rate?

Selecciona una de las siguientes respuestas posibles:

  • Vinegar and baking soda chunks

  • Vinegar and a baking soda tablet

  • Vinegar and baking soda powder

  • Vinegar and a baking powder (baking soda mixed with citric acid) tablet

Explicación

Pregunta 8 de 8

1

Rellena los espacios en blanco para completar el texto.

Decreasing the particle size the rate of the reaction. chunks have a small surface area so react only slowly, because only those particles on the outside are available for . Smaller pieces and powder have a surface area (for the same amount of reactant), and so more particles are available for collisions. Because more particles are available, there will be more collisions per second and therefore the rate of the will increase.

Explicación

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