Chapter 2 Chemistry

Notes & Vocabulary

Notes

There are seven base units in SI. A base unit is a defined unit in a system of measurement that is based on an object or event in the physical world. A base unit is independent of other units. Some familiar quantities that are expressed in base units are time, length, mass, and temperature.

Vocab

Base Unit- is a defined unit in a system of measurement that is based on an object or evet in the physical world.

Second- The base unit for time.

Meter- The base unit for length.

Kilogram- Base unit for mass.

Derived Unit- A unit that is defined by a combination of base units.

Liter- The metric unit for volume equal to one cubic decimeter.

Density- is a ratio that compares the mass of an object to its volume.

Kelvin- is the SI base unit for temperature.

Scientific notation- expresses numbers as a multiple of two factors: a number between 1 and 10; and ten raised to a power, or exponent.

Conversion factor- is a ratio of equivalent values used to express the same quantity in different units.

Dimensional analysis- is a method of problem-solving that focuses on the units used to describe matter.

Accuracy- refers to how close a measured value is to an accepted value.