What is Chemistry? Flashcards
What is matter?
Anything that occupies space and has mass
What is a substance (a.k.a. a chemical)?
Matter that has a definite and uniform composition
What is mass?
A measurement that reflects the amount of matter;
Independent of gravitational pull
What is weight?
A measure not only of the amount of matter but also of the effect of Earth’s gravitational pull on that matter
What is a base unit?
A defined unit in a system of measurement that is based on an object or event in the physical world
What is temperature?
The quantitative measurement of the average kinetic energy of the particles that make up an object
What is a derived unit?
A unit defined by a combination of base units
What is volume?
The space occupied by an object
What is density?
A physical property of matter and is defined as the amount of mass per unit volume
What is chemistry?
The study of matter and the changes that is undergoes
What is science?
The use of evidence to construct testable explanations and predictions of natural phenomena, as well as, the knowledge generated through this process
What is a hypothesis?
A testable explanation of a situation or phenomena
What is a theory?
An explanation of a natural phenomenon based on many observations and investigations over time
What is a scientific law?
A relationship in nature that is supported by many experiments
What is pure research?
Gain knowledge for the sake of knowledge
What is applied research?
Solve a specific problem
What is a model?
A visual, verbal, or mathematical explanation of experimental data
What is scientific notation?
Can be used to express any number as a number between 1 and 10 multiplied by 10 raised to a power
What is dimensional analysis?
A systematic approach to problem solving that uses conversion factors to move, or convert, from one unit to another
What is a conversion factor?
A ratio of equivalent values having different units
What is accuracy?
Refers to how close a measured value is to an accepted value
What is precision?
Refers to how close a series of measurements are to one another
What is error?
Defined as the difference between an experimental value and an accepted value
What is percent error?
Expresses error as a percentage of the accepted value
What is significant figures?
Include all known digits plus one estimated digit
What is the second?
Defined by the frequency of the radiation given off by a cesium-133 atom
What is the meter?
The distance that light travels in a vacuum in 1/299,792,458 of a second
What is the kilogram?
Defined by a platinum and iridium cylinder kept in France
What is the kelvin?
The SI base unit for temperature
