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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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How do you calculate the relative formula mass of a molecule?? |
You add the mass numbers of each element in the compound |
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What is the law of Conservation of mass? |
The mass of the reactants is the same as the mass of the products |
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Why would the Mass of a reaction seem to Change if one of the products was a gass?? |
Because gasses have a much greater volume so it would appear that the products have a greater mass |
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If a set of readings have a large range about the mean, do they have a large or small uncertainty?? |
Large because the result can be in a large area |
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What are the units of Concentration?? |
g/dm^(3) To calculate you divide the mass by the volume |
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What's an Exothermic Reaction?? |
Giving out Energy ☇ |
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Example of an Exothermic Reaction? |
Combustion: the flame gives out a lot of energy Respiration |
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What is an Endothermic Reaction?? |
A reaction which takes in energy from surroindings |
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What's an example of an Endothermic Reaction?? |
Activating an Ice Pack Photosynthesis |
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What is the activation energy for a Reaction?? |
The energy required to start a reaction by breaking the bonds in the reactants (before reaction=products) |
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What does the reaction profile for an Exothermic Reaction look like?? |
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Reaction Profile for Endothermic?? |
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What is an Oxidation Reaction?? |
Oxidation is the loss of electrons |
OILRIG |
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Metal+Oxygen➡ |
Metal Oxide |
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Metal+Water➡ |
Metal Hydroxide+Hydrogen |
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Metal+Acid➡ |
Metal Salt+Hydrogen |
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What is a Reduction reaction?? |
Gaining electrons |
OILRIG |
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What is the Reactivity Series of Metal?? |
Potassium Sodium Calcium Magnesium Aluminium Carbon Zinc Iron Tin Lead Hydrogen Copper Silver Gold |
Please Stop Calling Me A Crazy Zebra, It's Too Hard Coz She's Gold |
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Describe a Displacement Reaction |
We can use carbon to displace metals which are less reactive than it to remove them from ores. For example: |
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Name three Metals with low reactivity |
Gold, Silver, Copper |
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Name 3 metals with High Reactivity |
Potassium, Calcium, Magnesium |
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What is an Acid?? |
A molecule or other species which can donate a proton or accept an electron pair in reactions. All acids contain Hydrogen which is released as H+ ion. |
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How can metals which are less reactive than carbon be extracted from their oxides?? |
Through Electrolysis |
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What happenes in a Neautralisation Reaction?? |
An Acid and a base react to gain a neutral PH. |
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What's the Range of the PH solution?? |
1-14 7 is neutral (Green) 14 is alkaline (Purple) 1 is acid (Red) |
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Define Electrolysis |
It's a chemical technique, where electricity is used to split compounds into their elements |
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What's Anode and what is collected there?? |
The anode electron has a positive charge (less electrons) Thus it attracts anions (ions with a negative charge) |
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What's Cathode and what's Collected at it?? |
Cathode is the electrode with a negative charge (more electrons) Cations (ions with a negative charge) |
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Describe the process of Electrolysis |
1) A cell causes the flow of electrons, which gives each electrode a positive or negative charge. 2) When the electrodes are placed in the electrolyte, the positive ions are drawn towards the cathode, splitting the compound, and the negative ions are drawn to the anode. |
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Describe what occurs at the cathode |
The least reactive non metal ion gains electrons and leaves (evaporates or collects as a solid) If Hydrogen is less reactive then it will be released. |
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Describe what occurs at the anode |
If there is a halide (group 7 element) present, it looses electrons. If there are no halides oxygen is released |
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