Formation Of New Substance Vocabulary Test

A subscript is a number written just below the line that shows how many atoms of an element are present in the formula. In chemical formulas, subscripts indicate the ratio of atoms in a molecule or compound. For example, in the chemical formula H2O, the subscript 2 indicates that there are two hydrogen atoms for every one oxygen atom. Therefore, the correct answer is subscript.

A chemical formula is a combination of chemical symbols that represents the atoms present in a substance and their proportions. It provides information about the elements and their ratios in a compound. By using chemical symbols and subscripts, a chemical formula gives a concise representation of the composition of a substance. It is an essential tool in chemistry for identifying and describing different compounds.

The given characteristics, such as size, shape, density, hardness, color, and state of matter, are all examples of physical properties. Physical properties can be observed without changing the identity of the substance. They describe the inherent qualities of a substance and can be measured or observed without any chemical reactions taking place.

The given correct answer is "Property." In the context of the characteristics or qualities of a substance, the term "property" refers to the various attributes or features that describe a substance. These properties can be classified into two main categories: physical properties and chemical properties. Physical properties include characteristics such as color, density, and melting point, while chemical properties describe the behavior of a substance during chemical reactions. Therefore, "property" is the most appropriate choice to describe the characteristics or qualities of a substance.

A decrease in volume is not typically considered evidence of a chemical reaction. Chemical reactions often involve the rearrangement of atoms and molecules, resulting in the formation of new substances with different properties. Color change, temperature change, and production of gas are more commonly observed as evidence of a chemical reaction, indicating a change in the chemical composition or structure of the substances involved. However, a decrease in volume could be a result of physical processes such as compression or evaporation, rather than a chemical reaction.

When a solid substance is separated from a solution, it is called precipitation. This process occurs when two or more substances react chemically, causing the formation of a new compound that is insoluble in the solvent. The insoluble compound then appears as a solid precipitate, which can be separated from the solution through filtration or other methods. Therefore, "Precipitate" is the correct answer as it directly relates to the process of separating a solid substance from a solution.

A compound is made from two or more elements that are chemically combined. It cannot be separated by physical means into other substances and has different properties than the original elements that formed it. In other words, a compound is a substance that is formed when atoms of different elements chemically bond together, creating a new substance with its own unique properties.

A physical change refers to a change in the physical properties of a substance, such as its size, shape, or state of matter, without forming a new substance. In this case, the given explanation aligns with the definition of a physical change as it mentions that the change does not involve the formation of a new substance.

Chemical properties are characteristics that can be observed when a chemical reaction changes the identity of a substance. These properties include the potential of a substance to rust, corrode, or combust. Unlike physical properties, which describe the appearance or state of a substance, chemical properties involve the transformation of the substance at a molecular level. Therefore, the given answer, "Chemical Property," correctly describes the characteristics observed when a chemical reaction changes the identity of a substance.

A chemical change refers to a process in which the identity of a substance is altered, resulting in the formation of new substances with different properties. This change typically involves a chemical reaction, where chemical bonds are broken and new bonds are formed. Unlike physical changes, which only affect the physical properties of a substance (such as shape, size, or state), a chemical change leads to the creation of entirely new substances.

A molecule is the smallest particle of a compound that can exist on its own and keep its properties. It consists of two or more atoms chemically bonded together. This distinguishes it from an atom, which is the smallest unit of an element that retains its chemical properties. An element is a pure substance made up of only one type of atom. A compound, on the other hand, is a substance composed of two or more different elements chemically bonded together. Therefore, the correct answer is molecule.