Term
| Why does an increase in pressure speed up the rate of a reaction involving gases? |
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Definition
| Concentration of a gas increases with pressure, and an increase in concentration results in a faster reaction rate due to more frequent collisions between reacting particles. |
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Term
| What role does the spark from the igniter play in the reaction that takes place when propane is burned in a gas grill? |
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Definition
| The spark provides enough energy to break the bonds of reacting molecules and get the reaction started. |
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Term
| What is the formula for barium nitrate? |
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Definition
| Ba is in the same group as Mg, so its ion has a charge of 2+. Nitrate (NO3) ion has a charge of 1-, so the ratio is 1 to 2. The formula is Ba(NO3)2+ |
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Term
| What is the formula for potassium dichromate? |
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Definition
| K ion has a charge of 1+ and Cr2O7 ion has a charge of 2-. The ratio is 2 to 1, so the formula is K2Cr2O7+ |
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Term
| What is the formula for mercury(II) sulfide? |
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Definition
| Hg ion has a charge of 2+ and S ion has a charge of 2-. The ratio is 1 to 1, so the formula is HgS |
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Term
| What is the formula for iron(III) chloride? |
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Definition
| Fe(III) ion has a charge of 3+ and Cl ion has a charge of 1-. The ratio is 1 to 3, so the formula is FeCl3 |
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Term
| What is the formula for magnesium fluoride? |
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Definition
| Mg ion has a charge of 2+ and F ion has a charge of 1-. The ratio is 1 to 2, so the formula is MgF2 |
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Term
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Definition
| A metallic bond is the attraction between a metal cation and the cation and the shared electrons that surround it |
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Term
| The cations in a metal form a lattice. What holds the lattice in place? |
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Definition
| The lattice is held in place by strong metallic bonds between the cations and the surrounding valence electrons. |
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Term
| What information is provided by the name and formula of a molecular compound? |
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Definition
| The name and formula of a molecular compound describe the type and number of atoms in a molecule of the compound. |
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Term
| Describe the general rule for naming molecular compounds |
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Definition
| The most metallic element appears first in the name. |
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Term
| Why does increasing the surface area of a reactant tend to increase the reaction rate? |
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Definition
| The increase in exposure of reactants to one another results in more collisions involving reactant particles. With more collisions, more particles react. |
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Term
| Magnesium burns in the presence of oxygen to form magnesium oxide, MgO. Write a balanced equation for this reaction |
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Definition
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Term
| Hydrogen peroxide, H2O2, decomposes to form water and oxygen. Write a balanced equation for this reaction. |
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Definition
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Term
| Barium hydroxide, Ba(OH)2, reacts with nitric acid, HNO3, to form barium nitrate and water. Write a balanced equation for this reaction. |
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Definition
| Ba(OH)2 + 2HNO3 --> Ba(NO3)2 + 2H2O |
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Term
| What happens when a chemical change does not go to completion? |
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Definition
| A chemical equilibrium is established between the forward and reverse reactions. |
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Term
| According to Le Chatelier´s principle, how does lowering the concentration of a reaction product affect a chemical equilibrium? |
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Definition
| Lowering the concentration of a reaction product causes the equilibrium to shift in the direction that forms more of the product. |
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Term
| What happens when a physical change does not go to completion? |
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Definition
| A physical equilibrium is established between the forward and reverse changes |
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Term
| What is a double replacement reaction? |
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Definition
| A double replacement reaction is a reaction in which two different compounds exchange positive ions and form new compounds. |
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Term
| What is an oxidation reduction reaction? |
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Definition
| An oxidation reduction reaction is a reaction in which electrons are transferred from one reactant to another. |
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