Level 34 Level 36
Level 35

Introduction to Chemistry, Measuring & Calculating


46 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Ignore?
Chemistry is...
... the science that seeks to understand what matter does by studying what atoms and molecules do
control
In an experiment, the standard that is used for comparison
scientific method
A logical, systematic approach to the solution of a scientific problem
vairable
anything that can be measured and that can vary, something a researcher measures or manipulates
Hypothesis
a testable prediction, often implied by a theory.
Theory
a hypothesis that has been tested with a significant amount of data
law
A statement that summarizes or describes the observations about our world and experiments
matter
any substance that occupies space and has mass.
model
A pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
Mass
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
Compound
A pure substance composed of two or more elements in fixed definite proportions. This can be broken down into simpler substances
mixture
A _______ is a combination of two or more substances that do not change chemically when you mix them.
element
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
family
A column in the periodic table
group
A column on the periodic table
metal
_______ + nonmetal is an example of an ionic bond
nonmetal
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.
solution
A homogeneous mixture of two or more substances
solvent
A _______ is a substance that can dissolve other substances.
solute
A _______ is a substance that dissolves in a solvent to make a solution.
Homogeneous
A mixture in which all the individual substances are evenly mixed throughout.
hetergeneous
differing in kind; dissimilar; varied
endothermic
A chemical reaction that absorbs heat
exothermic
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
accuracy
A description of how close a measurement is to the true value of the quantity measured.
precision
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
Weight
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
Volume
A measure of space (lwh)
uncertainty
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%
Temperature
? T :: ? collisions :: ? rate of reaction
derived unit
A unit defined by a combination of base units
quantitative
measuring the quantity of something
qualitative
measuring the quality of something