8th Grade Physical And Chemical Changes Quiz

True. The arrangement of elements in the periodic table is based on increasing atomic number, which corresponds to the number of protons found in the nucleus of each atom of the element. This organization follows the modern periodic law proposed by Henry Moseley, stating that the properties of elements are a periodic function of their atomic number. As you move from left to right across a period (horizontal row) in the periodic table, the atomic number of elements increases.

Burning a piece of wood involves a chemical change because the complex organic molecules in the wood undergo a reaction with oxygen, leading to the release of heat, light, and the formation of new substances like ash and smoke. This transformation alters the chemical composition of the wood, distinguishing it from a simple physical change.

The property of matter described as the amount of space an object occupies is called "volume." Volume represents the three-dimensional extent of an object or substance and is a fundamental characteristic used to quantify its physical size or capacity.

The correct answer is "State." The physical form in which a substance exists, such as a solid, liquid, or gas, is referred to as its state. This refers to the arrangement and movement of particles in the substance.

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the presence of air, forming iron oxide, commonly known as rust. This process involves the rearrangement of atoms and the creation of new substances, resulting in a change in the composition and properties of the original material.

Burning paper involves the transformation of its chemical composition through a process of combustion, resulting in the formation of new substances like ash, smoke, and gasses, which classifies it as a chemical change.

Malleability refers to the property of a material to be easily pounded or hammered into thin sheets without breaking or cracking. It is a characteristic commonly found in metals, such as gold and aluminum, which can be shaped into various forms and structures. This property is essential in various industries, including construction, manufacturing, and jewelry making.

Thermal conductivity refers to the ability of a material to transfer thermal energy from one area to another. It is a measure of how well a material can conduct heat. Materials with high thermal conductivity can transfer heat quickly, while those with low thermal conductivity transfer heat slowly. This property is important in various applications, such as in the design of insulation materials or in the selection of materials for heat exchangers.