Chemistry Unit 2 Study Guide Answers

What is an extensive property?a property that depends on the amount of matter in a sample
ex. volume and mass
What is an intensive property?a property that depends on the type of matter in a sample
ex. silk, hardness, cotton, color,
What is a substance?matter that has a uniform and definite composition
ex. pure water,
What is a physical property?a quality of a substance that can be observed without changing its composition
ex. color, temp., melting and boiling point, shape, size, volume, density
What is a chemical property?the ability of a substance to undergo a specific change
ex. rusting, baking a cake, burning, fermentation, molding
What are the differences between a physical and chemical property?The difference between a physical property and a chemical property is that a physical property can be observed without changing the composition of a substance. A chemical property can only be observed by changing the composition of a substance.
soliddefinite shape and volume
liquidindefinite shape and fixed volume (doesn’t change in a container)
gasindefinite shape and volume (takes the volume and shape of its container)
What is a physical change?when some properties of a material change but the composition does not
What is a chemical change?a change that takes the original matter and creates a different matter with a different composition
ex. rotting, rusting, burning, baking, frying
Which types of change are reversible?boiling, melting, freezing, condensing
Which types of change are irreversible?cutting, cracking, breaking, splitting, grinding, crushing
What are the components in a chemical reaction?a reactant and a product
How do you know if a chemical reaction has taken place?if the composition of matter has changed
What are the 4 concrete pieces of evidence that a chemical reaction has taken place?transfer of energy, a change in color, the production of gas, the formation of a precipitate
What are some physical changes in cooking?cutting cheese, zest lemons, cracking an egg, zesting a lemon
What are some chemical changes in cooking?frying onions, cooking vegetables, baking pastries
What is the conservation of mass?during a physical or chemical change, mass is neither created or destroyed
How does the conservation of mass apply to chemical reactions?the mass will say the same, the mass of the product will be the same as the reactant
What is a mixture?a physical blend of two or more components
What are the 2 classifications of a mixture?homogeneous and heterogeneous
heterogeneous mixturea mixture in which the composition is not uniform throughout
ex. soil, a salad, a mixed vegetable soup, oil and vinegar
homogeneous mixturea mixture in which the composition is uniform throughout
ex. salt and sugar water, rubbing alcohol,
What is a 2-phase mixture and how can you separate them?filtration and distillation
What’s the other known name for referring to homogeneous mixtures?a solution: solvent + solute
How is a mixture different that a substance?the composition of a substance is fixed and the composition of a mixture is can vary
What is an element?simplest form of matter that has a unique set of properties
What is a compound?a substance that contains two or more elements in a fixed proportion
ex. air, water, sugar, salt
What is the chemical symbol for Sliver?Ag
What is the chemical symbol for Nitrogen?N
What is the chemical symbol for Iron?Fe
What is the chemical symbol for Chlorine?Cl
What is the chemical symbol for Fluorine?F
What is the chemical symbol for Bromine?Br
What is the chemical symbol for Iodine?I
What is the chemical symbol for Sodium?Na
What is the chemical symbol for Potassium?K
What is the chemical symbol for Calcium?Ca
What is a chemical formula?a shorthand way to represent compounds
What does a chemical formula indicate?the relative proportions of the element in a compound, the composition, and the identity