Αποτελέσματα Αναζήτησης
Explain the process of measurement and describe the three basic parts of a quantity. Describe the properties and units of length, mass, volume, density, temperature, and time. Recognize the common unit prefixes and use them to describe the magnitude of a measurement. Describe and calculate the density of a substance.
Chemical properties are characteristics that describe how the chemical structure of matter changes during a chemical reaction. An example of a chemical property is flammability—a materials ability to burn—because burning (also known as combustion) changes the chemical composition of a material.
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number); a standard of comparison for the measurement (a unit); and an indication of the uncertainty of the measurement.
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement.
Uncertainty in Measured Quantities • When measuring, for example, how much an apple weighs, the mass can be measured on a balance. The balance might be able to report quantities in grams, milligrams, etc. • Let’s say the apple has a true mass of 55.51 g. The balance we are using reports mass to the nearest
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number); a standard of comparison for the measurement (a unit); and an indication of the uncertainty of the measurement.
Express quantities properly using a number and a unit. Recognize the different measurement systems used in chemistry. Describe how prefixes are used in the metric system and identify how the prefixes milli-, centi-, and kilo- compare to the base unit. Understand when and how to use scientific notation to represent measurements.
