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[Front]

sodium thiosulfate solution + hydrochloric acid -> ?

[Back]

solid sulfur

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GCSE Chemistry Flashcards - Details

Levels:

1) Rates of Reaction - Required Practical: Temperature and Catalyst View
2) Rates of Reaction - Concentration & Surface Area View
3) Acids Reacting with Metals View
4) Equilibrium View

Questions:

31 questions

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Sodium thiosulfate solution + hydrochloric acid -> ?

Solid sulfur

Solid sulfur makes the solution go cloudy. Scientists call this ?

Turbidity

A measurement is ? if it can be repeated by another person or using a different technique or equipment and still get the same result.

Reproducable

The problem with the disappearing cross experiment is that different people have different ?

Eyesights

Magnesium + hydrochloric acid -> magnesium chloride + ?

Hydrogen

The greater the concentration of a chemical in a reaction, the ? the reaction takes place.

Faster

? states that chemical reactions can only take place when the reacting particles collide with each other with sufficient energy.

Collision theory

The rate of a chemical reaction is determined by the ? of successful collisions.

Frequency

Because the rate of reaction increases with temperature, we can say that the rate of reaction is ? to the temperature.

Proportional

Catalysts increase the rate of chemical reactions but are not ? during the reaction.

Used up

We do not include catalysts in the ? for a reaction because they are not used up in the reaction.

Chemical equation

Different ? need different catalysts.

Reactions

? act as catalysts in living organisms.

Enzymes

On a reaction graph, the ? the slope, the faster the reaction.

Steeper

As the line on a reaction graph becomes less steep, the rate of reaction is ?.

Decreasing

Mean rate of reaction = ? of product formed / time taken

Quantity

To calculate the rate of reaction at a specific point on a rate of reaction graph, you draw a line called a ?.

Tangent

Acid + Metal -> ? + Hydrogen

Salt

Magnesium reacts ? with acids.

Rapidly

Zinc reacts quite ? with acids.

Rapidly

Iron reacts fairly ? with acids.

Slowly

Acids produce ? ions in aqueous solutions.

Hydrogen

Oxidation occurs when ions ? electrons.

Lose

Reduction occurs when ions ? electrons.

Gain

? reactions are types of reactions that form both backwards and forwards.

Reversible

If you heat something in a forward reaction, the forward reaction is ?.

Endothermic

If a reversible reaction is exothermic in one direction, it is exothermic in the ? direction.

Opposite

? is when both sides of a reversible reaction take place at the same rate.

Equilibrium

'If a system is at equilibrium and a change is made to the conditions, then the system responds to counteract that change.' is ?

Le Chatelier's Principle

When the ? of one side of the reaction is increased, more of the other side of the reaction is made to get back to equilibrium.

Concentration

If the ? is increased on a reversible reaction at equilibrium, the position of the equilibrium shifts to the side with the smaller number of molecules.

Pressure