Chapter 1
Earth Science
Course: Elementary Education Multiple Subjects 7001
Subject: Elementary Education Science Subtest 7005
Chapter: Physical Science
1. Physical Properties of Matter
Physical properties are characteristics that can be observed or measured without changing the chemical identity of a substance. These properties help describe the appearance, behavior, and condition of matter and are crucial for classification, comparison, and identification.
Examples of physical properties include:
- Mass: The quantity of matter in an object, typically measured using a balance. For example, a bag of rice may have a mass of 2 kilograms.
- Volume: The amount of space an object or substance occupies. For instance, a bottle may hold 1 liter of water.
- Density: Defined as mass divided by volume (D = m/v). This property determines whether an object sinks or floats. For example, oil floats on water because its density is lower than that of water.
- Color and luster: These include visual properties such as the shiny appearance of metals or the dull appearance of chalk.
- Texture: The feel or surface quality of a substance—rough, smooth, soft, or hard.
- Melting point and boiling point: These are the specific temperatures at which a solid becomes a liquid or a liquid becomes a gas. For example, water melts at 0°C and boils at 100°C at sea level.
- Solubility: The ability of a substance (solute) to dissolve in a solvent. Sugar dissolving in tea is a common classroom example.
- Electrical and thermal conductivity: Metals like copper and silver conduct electricity and heat efficiently, which is why they are used in wiring and cookware.
- Magnetism: Some materials, such as iron and nickel, are attracted to magnets, making this a useful property for sorting metals.