Chemistry Vocab

Front 1

Absolute zero-

Back 1

The zero point on the Kelvin scale, 0 K, or absolute zero, is equal to -273.15ºC. For problems in this text, you can round -273.15ºC to -273ºC.

Front 2

Accepted value-

Back 2

You probably know the difference between the accepted value of the boiling point of pure water under these conditions is actually 100.0ºC. There is a difference between the accepted value, which is the correct value based on reliable references , and the experimental value, the value measured in the lab.

Front 3

Accuracy-

Back 3

Correctness and reproducibility relate to the concepts of accuracy and precision. Accuracy is a measure of how close a measurement comes to the actual or series of measurements are to one another.

Front 4

Calorie-

Back 4

The joule and the calorie are common units of energy. One calorie is the quantity of heat that raises the temperature of 1 g of pure water by 1ºC.

Front 5

Celsius Scale

Back 5

The Celsius scale is named after the Swedish astronomer Anders Celsius. The Celsius scale sets the freezing point of water at 0ºC and the boiling point of water 100ºC.

Front 6

Conversion Factor-

Back 6

A ratio of equivalent measurements used to convert a quantity from one unit to another. The ratios 100 cm/ 1 m and 1 m/100 cm are examples of conversion factores.

Front 7

Density-

Back 7

Density is an intensive property that depends only on the composition of a substance, not on the size of the sample. With a mixture, density can vary because the composition of a mixture can vary.

Front 8

Dimensional Analysis-

Back 8

No single method is best for solving every type of problem. Dimensional analysis is a way to analyze and solve problems using units, or dimensions of the measurements.

Front 9

Energy-

Back 9

Energy is the capacity to do work or to produce heat. Solar panels convert the radiant energy from the sun into electrical energy that can be used to heat water and power appliances

Front 10

Error-

Back 10

The difference between the accepted value and the experimental value is called error. Error= experimental value-accepted value.

Front 11

Experimental Value-

Back 11

A quantitative value measured during an experiment. Experimental value differs from the accepted value.

Front 12

Gram (g)-

Back 12

A metric mass unit equal to the mass of 1 cm3 of water at 4ºC. A gram is 1/100 of a kilogram.

Front 13

International system of units

Back 13

The revised version of the metric system, adopted by international agreement in 1960. The five base SI base units commonly used by chemists are the meter, the kilogram, the Kelvin, the second, and the mole.

Front 14

Joule-

Back 14

The SI unit of energy; 4.184 J equal one calorie. It is named after the English physicist James Prescott Joule.

Front 15

Kelvin Scale-

Back 15

The temperature scale in which the freezing point of water is 273 K an the boiling point is 373 K; 0 K is absolute zero. Within the Kelvin scale, the degree sign is not used.

Front 16

Kilogram (kg)-

Back 16

The mass of 1 L of water at 4ºC; it is the base unit of mass in SI. The mass of an object is measured in comparison to a standard mass of 1 Kilogram.

Front 17

Liter (L)-

Back 17

The volume of a cube measuring 10 centimeters on each edge (1000 cm3). It is the common unprefixed unit of volume in the metric system.

Front 18

Measurement-

Back 18

A quantitative description that includes both number and unit. Measurements are fundamental to the experimental sciences.

Front 19

Meter-

Back 19

The base unit of length in SI. All measurements of length cane be expressed in meters.

Front 20

Percent error

Back 20

The percent that a measured value differs from the accepted value. It is the absolute value of the error divided by the accepted value, multiplied by 100%.

Front 21

Precision-

Back 21

Describes the closeness, or reproducibility, of a set of measurements taken under the same conditions. It is a measure of how close a series of measurements are to one another.

Front 22

Scientific Notation-

Back 22

An expression of numbers in the form m * 10N, where M is equal or greater than 1 and less than 10, and N is an integer. It’s a given number that is written as a product of two numbers: a coefficient and 10 raised to a power.

Front 23

Significant Figures-

Back 23

All the digits that can be known precisely in a measurement, plus a last estimated digit. Calculators often depend on the number of significant figures in the values used in the calculation.

Front 24

Temperature-

Back 24

A measure of the average kinetic energy of particles in matter; temperature determines the direction of heat transfer. It is a measure of how hot or cold and object is.

Front 25

Weight-

Back 25

A force that measures the pull of gravity on a given mass. IT is a measure of force, which is different from mass, which is a measure of the quantity of matter.