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Level 35

Introduction to Chemistry, Measuring & Calculating

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Chemistry is...
... the science that seeks to understand what matter does by studying what atoms and molecules do
In an experiment, the standard that is used for comparison
scientific method
A logical, systematic approach to the solution of a scientific problem
anything that can be measured and that can vary, something a researcher measures or manipulates
a testable prediction, often implied by a theory.
a hypothesis that has been tested with a significant amount of data
A statement that summarizes or describes the observations about our world and experiments
any substance that occupies space and has mass.
A pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
A measure of the amount of matter in an object (m= D*v)
chemical property
A characteristic of a pure substance that describes its ability to change into different substances
physical property
A characteristic of a pure substance that can be observed without changing it into another substance
chemical change
A change that occurs when one or more substances change into entirely new substances with different properties.
physical change
A change in a substance that does not involve a change in the identity of the substance
intensive property
a physical property such as boiling point, density, or color that does NOT change when you change the size of an object.
extensive property
a physical property such as mass that changes when you change the size of an object
A pure substance composed of two or more elements in fixed definite proportions. This can be broken down into simpler substances
A _______ is a combination of two or more substances that do not change chemically when you mix them.
2 Hydrogen atoms bonded together is a _______
pure substance
A sample of matter, either a single element or a single compound, that has definite chemical and physical properties
A column in the periodic table
A column on the periodic table
_______ + nonmetal is an example of an ionic bond
a bond formed between and metal and a _______ is generally classified as ionic. an example of this would be the bond formed between lithium and flourine.
A homogeneous mixture of two or more substances
A _______ is a substance that can dissolve other substances.
A _______ is a substance that dissolves in a solvent to make a solution.
A mixture in which all the individual substances are evenly mixed throughout.
differing in kind; dissimilar; varied
A chemical reaction that absorbs heat
A chemical reaction that releases energy
metric system
An international system of measurement based on multiples of ten. Also called International System.
scientific notation
_______ is used to represent a very large or very small number as a power of 10
A description of how close a measurement is to the true value of the quantity measured.
closeness to a set of measurements of the same quantity madeht same way
conversion factor
a fraction used to convert from one unit to another
A measure of the gravitational force exerted on an object.
dimensional analysis
A technique of problem-solving that uses the units that are part of a measurement to help solve the problem
A measure of space (lwh)
Doubt, the state of being unsure
significant figures
All the digits that can be known precisely in a measurement, plus a last estimated digit
percent error
The absolute value of the error divided by the accepted value, multiplied by 100%
? T :: ? collisions :: ? rate of reaction
derived unit
A unit defined by a combination of base units
measuring the quantity of something
measuring the quality of something