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PS- Chapter 2/3

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Question
Answer
What is the molelar mass of one molecule of MgS (Magnesium Sulfide)?   Molelar Mass: Mg- 24.305 S- 32.066 Molelar Mass= 56.4  
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What does viscosity mean?   The resistance of a liquid to flow (a liquids "thickness")  
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What are the 3 ways to increase the rate of dissolving are a particular solute?   Three different ways to dissolve a solute quicker involves: 1. stirring 2. heating 3. increasing surface area of solute (breaking solute apart)  
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Whats the difference between a homogeneous and heterogeneous mixture?   Homogeneous- uniform appearance, particles do not settle at bottom, usually transparent. Heterogeneous- material settles at bottom, non-uniform appearance.  
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How many elements, in a proportion, makes a compound?   2 or more elements.  
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Why can the properties of a mixture vary?   The properties of a mixture can vary because the composition of a mixture is not fixed.  
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What determines if a mixture is a solution, suspension, or a colloid?   Size of the mixture's largest particles.  
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What are some examples of physical properties?   Viscosity, conductivity, malleability, hardness, melting point, boiling point, and density are examples of physical properties.  
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What is the different between a melting and a boiling point?   Melting point- temperature at which a substance changes from a solid to a liquid. Boiling point- temperature at which a substance boils.  
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If gold can be hammered into a different size and shape, then it is what?   Malleable.  
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Why do we use physical properties?   Used to identify a material, to choose a material for a specific purpose, or to separate the substances in a mixture.  
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What are two common separation methods?   1. Filtration 2. Distillation  
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Using a wire screen to locate small objects in buried sand would be what kind of separation method?   Filtration  
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What exactly is a physical change?   Occurs when some of the properties of a material change, but the substances in the material stay the same  
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What exactly is a chemical change?   Occurs when a substance reacts and forms one or more new substances.  
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What causes the formation of a precipitate?   When a solid separates from a liquid mixture, and forms a solid construct within mixture.  
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How can you recognize chemical changes?   If the substance has a change in color, produces gas, forms a precipitate, or has a change in temperature.  
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How can you recognize if a chemical, or physical, change has occurred?   When matter undergoes a chemical change, the composition off the matter changes. When matter undergoes a physical change, the composition of the matter remains the same.  
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Why does an element have a fixed composition?   Because it contains only one type of atom.  
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What is the definition of Solubility?   Solubility is the maximum solute that normally dissolves in a given amount of solvent of a certain temperature.  
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Created by: cbranham12
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