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Chemistry DUT 2

Chem Test 2

QuestionAnswer
Physical properties can be observed and measured without changing the kind of matter being studied.
Melting point The temperature at which a solid can change to a liquid; this temperature remains unchanging under constant conditions.
Ice melts at _____ degrees Celsius and ______ degrees Fahrenheit. 0 degrees C, 32 degrees F
Boiling point the temperature at which liquids boil and change states from a liquid to a gas.
The boiling point for pure water at sea level is _____ degrees Celsius or ______ degrees Fahrenheit. 100 degrees C, 212 degrees F
Density a property that describes the relationship between the mass of a material and its volume.
Substances that are denser contain more ________ in a given volume. matter
Density is a size _____ physical property, meaning that it does not change no matter how large or small the sample. independent
Physical properties used to help identify a substance melting point, boiling point, density, and color or absence of color
Chemical properties can be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition.
Examples of chemical properties ability to rust and ability to burn
Ability to burn a chemical property that involves a substance reacting quickly with oxygen to produce light and heat.
Ability to rust a chemical property that involves a substance reacting slowly with oxygen.
Physical changes do not change the composition of a substance, only the physical properties.
When a substance changes from one state of matter to another, the ___________ of the substance remains the same. composition
Examples of change in state melting of ice cream, hardening of melted wax, or evaporating of water from wet clothes.
Sublimation When a substance changes directly from a solid to a gas
Deposition When a substance changes directly from a gas to a solid
Dry ice and solid air fresheners are examples of ____________. sublimation
Water vapor forming frost is an example of ___________. deposition
Examples of physical changes change in state of matter and change in size or shape.
Cutting, tearing, dissolving, stretching, or wrinkling are all examples of _______. change in size or shape
Chemical changes result in the formation of one or more new substances with new chemical and physical properties.
Evidence of chemical changes color change, temperature change, formation of a precipitate, formation of a gas
Precipitate when two solutions are combined and form a solid
Substances can be classified as acids, bases or neutral based on their ____ pH
Acids and bases are solutions usually with ______ as the solvent. water
pH scale a way to measure how acidic or basic a solution is.
The pH range of a solution between 0 and 14.
The pH of pure water is ___ 7
Any solution with a pH of 7 is a _______ solution. neutral
The pH of an acidic solution is ____ than 7 less
The lower the pH, the more _______ the solution. acidic
The pH of a basic solution is _______ than 7 greater
The higher the pH, the more _______ the solution. basic
_____ can be identified by their sour taste and by their reaction with some metals. acids
_____ can be identified by their bitter taste and their slippery feel. bases
Acids and bases ___________ each other. neutralize
Indicators substances that can be used to determine whether a solution is acidic, basic, or neutral.
Litmus paper Has a special dye on it that changes colors in the presence of an acid or base.
Blue litmus paper turns red in an ______, and stays blue in a _____. acid, base
Red litmus paper turns blue in a _______, and stays red in an _______. base, acid
Both red and blue litmus paper turn ______ in a solution that is neutral. violet
Phenolphthalein is used to test for the presence of a base
Phenolphthalein is a colorless chemical that turns magenta in a ________, and stays colorless in an ______ or _______ solution. base, acidic, neutral
pH paper Has a range of colors depending on the pH of the solution; the color of the paper is compared to the chart on the vial to determine the pH.
Created by: Ms. Phillips