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21 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Is bond breaking endo or exothermic? |
It’s always endothermic |
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Is bond making endo or exothermic? |
It’s an exothermic reaction |
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What is happens in an endothermic reaction? |
Heat is taken in making the surrounding cold, breaking bonds. |
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What happens in an exothermic reaction? |
Heat is given out, making bonds. |
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What can an exothermic reaction be used for? |
Hand warmers |
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What can endothermic reactions be used for? |
Ice packs. |
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In an endothermic reaction, do products have more or less energy than reactants? |
Products have more energy than the reactants |
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In an exothermic reaction, do the products have more or less energy than the reactants? |
The products have less energy than the reactants. |
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What is the definition of activation energy? |
Activation energy is the minimum amount of energy needed for a chemical reaction to take place. |
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What are three things metals can do/are? |
Conduct electricity Malleable Positive ions |
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How does the difference of reactivity affect the voltage of a cell? |
The greater the difference in reactivity between the metals, the higher the voltage. |
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What are dry cells and why are they so popular? |
Cells with electrodes of zinc and carbon, they’re non-rechargeable. They’re popular because they produce a larger voltage. When the reactants run out, the cell stops producing electricity and needs to be thrown away. |
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What is a suitable electrolyte? |
Sodium chloride |
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What do cells rely on? |
The differing reactivity of metals. |
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What does the metal reactivity series do? |
Informs us which metals can displace other metals from their compound. |
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In which direction will electrons flow through the wire? |
From the more reactive to the less reactive metal. |
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Does the more or less reactive metal donate electrons to become cations? |
The more reactive metals donate electrons. |
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What happens in a cell |
A flow of electrons is an electrical current and will flow until one of the reactants is used up. |
Electrical current |
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Where do positive electrons go? |
To the cathode. |
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What is an example of an exothermic reaction? |
Combustion Respiration |
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What is an example of an endothermic reaction? |
Thermal decomposition Photosynthesis |
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