Key Terms For Chemical Building Blocks Chapter 1 Section 1

Matter refers to anything that has mass and takes up space. It includes both tangible objects and substances, such as solids, liquids, and gases. Matter is made up of atoms and molecules, and it can undergo physical and chemical changes. Therefore, the correct answer to the question is "matter."

Chemistry is the study of the properties of matter and how matter changes. It involves the investigation of the composition, structure, properties, and reactions of substances. By studying chemistry, scientists can gain a better understanding of the world around us and develop new materials and technologies.

A substance refers to a single kind of matter that is pure and has specific properties. It can be an element or a compound, and it cannot be separated into simpler components by physical means. Substances have distinct characteristics, such as a fixed melting point, boiling point, and chemical composition. They can exist in different states, such as solid, liquid, or gas, and can undergo physical or chemical changes.

The given answer correctly defines a mixture as two or more substances that are mixed together but not chemically combined. In a mixture, the substances retain their individual properties and can be separated by physical means such as filtration or evaporation. This is different from a compound, where the elements are chemically combined and cannot be easily separated. The answer accurately captures the essence of a mixture and distinguishes it from other concepts mentioned in the question.

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The correct answer is "The force that holds two atoms together." This answer accurately describes a chemical bond, which is the force that holds two atoms together in a molecule. Chemical bonds are formed when atoms share or transfer electrons to achieve a stable electron configuration. This force is responsible for the formation and stability of compounds.

The correct answer is "A characteristic of a pure substance that can be observed without changing it into another substance." This answer accurately describes a physical property, which refers to a characteristic or attribute of a substance that can be observed or measured without changing the substance's chemical composition. Physical properties include characteristics such as color, density, melting point, boiling point, and conductivity. These properties help to identify and classify different substances.

The given answer correctly defines a chemical formula as a representation that shows the elements present in a compound and the ratio of atoms of each element. A chemical formula provides valuable information about the composition of a compound and helps in understanding its structure and properties. It is a concise and standardized way of representing the chemical makeup of a substance.

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The correct answer is "A pure substance made of two or more elements chemically combined." This is because a compound is a substance that is composed of two or more different elements that are chemically bonded together. This definition distinguishes compounds from mixtures, which are combinations of substances that are not chemically bonded. Therefore, a compound can be considered a pure substance because it has a definite composition and properties that are different from its constituent elements.

The given answer is the correct definition of an element. An element is a pure substance that cannot be broken down into other substances by chemical or physical means. This means that elements are the simplest form of matter and are made up of only one type of atom. They cannot be further broken down or separated into simpler substances. This definition distinguishes elements from compounds, which are made up of two or more different elements chemically combined.

The correct answer is "A particle made of two or more atoms bonded together." This is because a molecule is defined as a particle that consists of two or more atoms that are chemically bonded together. This definition distinguishes a molecule from an atom, which is the basic particle from which all elements are made. Therefore, the answer accurately describes the nature of a molecule.

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The correct answer is "A mixture in which substances are evenly distributed throughout the mixture." This means that in a homogeneous mixture, the different components are spread out uniformly and cannot be easily distinguished from one another. This is in contrast to a heterogeneous mixture, where the different substances are not evenly distributed and can be seen as separate phases or regions within the mixture.

This answer is the only one that accurately describes a homogeneous mixture. A homogeneous mixture is one in which the substances are evenly distributed throughout the mixture, and it forms when substances dissolve. The other options do not accurately describe a homogeneous mixture.