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PS- Chapter 2/3

QuestionAnswer
What is the molelar mass of one molecule of MgS (Magnesium Sulfide)? Molelar Mass: Mg- 24.305 S- 32.066 Molelar Mass= 56.4
What does viscosity mean? The resistance of a liquid to flow (a liquids "thickness")
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)
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.
How many elements, in a proportion, makes a compound? 2 or more elements.
Why can the properties of a mixture vary? The properties of a mixture can vary because the composition of a mixture is not fixed.
What determines if a mixture is a solution, suspension, or a colloid? Size of the mixture's largest particles.
What are some examples of physical properties? Viscosity, conductivity, malleability, hardness, melting point, boiling point, and density are examples of physical properties.
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.
If gold can be hammered into a different size and shape, then it is what? Malleable.
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.
What are two common separation methods? 1. Filtration 2. Distillation
Using a wire screen to locate small objects in buried sand would be what kind of separation method? Filtration
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
What exactly is a chemical change? Occurs when a substance reacts and forms one or more new substances.
What causes the formation of a precipitate? When a solid separates from a liquid mixture, and forms a solid construct within mixture.
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.
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.
Why does an element have a fixed composition? Because it contains only one type of atom.
What is the definition of Solubility? Solubility is the maximum solute that normally dissolves in a given amount of solvent of a certain temperature.
Created by: cbranham12
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