The smallest part of an element that still has the physical and chemical properties of that element. This is the basic building block of matter.

A pure substance that cannot be broken down into other substances by chemical reactions. Examples include gold, silver, copper, and aluminum.

A substance consisting of two or more substances mixed together, but are not chemically combined. Examples include trail mix, salad, bird seed.

A mixture where the substances are evenly distributed, but can be separated by some physical process. An example is salt mixed tin water.

Fundamentals of Chemistry: Understanding Elements, Compounds, and Mixtures

1. What is a pure substance?

Any substance that is not man-made.

A substance made up of only one kind of material and has definite properties. Both elements and compounds are examples.

A mixture of different substances with varying properties.

A substance with constantly changing properties.

A pure substance is defined as a substance made up of only one kind of material and has definite properties. This includes both elements and compounds, which are examples of pure substances. It is important to distinguish pure substances from mixtures, which contain more than one kind of material with varying properties.

Explanation

A pure substance is defined as a substance made up of only one kind of material and has definite properties. This includes both elements and compounds, which are examples of pure substances. It is important to distinguish pure substances from mixtures, which contain more than one kind of material with varying properties.

2. What is an atom?

A type of subatomic particle.

The largest part of an element.

A molecule composed of multiple elements.

An atom is not the largest part of an element, but the smallest. It is not a molecule composed of multiple elements, but a single particle. It is also not a subatomic particle, but the basic building block of matter.

Explanation

An atom is not the largest part of an element, but the smallest. It is not a molecule composed of multiple elements, but a single particle. It is also not a subatomic particle, but the basic building block of matter.

3. What is an element?

A mixture of different substances

A type of energy produced by chemical reactions

A mechanical device used in chemistry experiments

Elements are pure substances made up of only one type of atom, which cannot be broken down further by chemical reactions. Unlike mixtures, elements consist of only one type of substance and do not require separation techniques. Additionally, elements are not mechanical devices nor a form of energy produced by chemical reactions.

Explanation

Elements are pure substances made up of only one type of atom, which cannot be broken down further by chemical reactions. Unlike mixtures, elements consist of only one type of substance and do not require separation techniques. Additionally, elements are not mechanical devices nor a form of energy produced by chemical reactions.

4. What is a mixture?

A type of chemical bond where electrons are shared between atoms.

A pure substance with a fixed chemical composition.

A reaction in which two substances combine to form a new substance with different properties.

A mixture is the physical combination of two or more substances, maintaining their individual properties.

Explanation

A mixture is the physical combination of two or more substances, maintaining their individual properties.

5. What is matter?

Anything that has weight.

Anything that is solid.

Anything that is tangible.

Anything that has matter and takes up space.

Matter is defined as anything that has mass and takes up space, including both solid, liquid, and gas forms.

Explanation

Matter is defined as anything that has mass and takes up space, including both solid, liquid, and gas forms.

6. What are the two categories of mixtures?

Homogeneous and Heterogeneous

Chemical and Physical

Organic and Inorganic

Liquid and Solid

Mixtures are divided into homogeneous mixtures where the components are evenly distributed and heterogeneous mixtures where the components are visibly different.

Explanation

Mixtures are divided into homogeneous mixtures where the components are evenly distributed and heterogeneous mixtures where the components are visibly different.

7. What is a solution?

An irreversible chemical reaction between two or more substances resulting in the formation of new substances.

A compound formed by the chemical combination of two or more elements.

A solid material produced by the condensation of a gas, vapor, or suspension.

A solution is a homogeneous mixture where one or more substances are dissolved in another substance. The substances can be evenly distributed and separated by physical means, such as evaporation or filtration.

Explanation

A solution is a homogeneous mixture where one or more substances are dissolved in another substance. The substances can be evenly distributed and separated by physical means, such as evaporation or filtration.

8. What is a compound?

A substance that is not found in nature.

A substance that is a mixture of two or more elements physically combined.

A substance that is made up of two or more elements chemically joined together. Example include sugar, water, and salt.

A substance that contains only one element.

A compound is different from a mixture as it involves a chemical bonding between elements, creating a new substance with unique properties.

Explanation

A compound is different from a mixture as it involves a chemical bonding between elements, creating a new substance with unique properties.

9. What are the two types of changes to matter?

Biological and Nuclear

Visible and Invisible

Physical and Chemical

Solid and Liquid

Physical changes involve altering the form of a substance without changing its chemical composition, while chemical changes result in the formation of new substances with different properties.

Explanation

Physical changes involve altering the form of a substance without changing its chemical composition, while chemical changes result in the formation of new substances with different properties.

10. What are the two categories of matter?

Solids and liquids

Pure substances and mixtures

Elements and compounds

Organic and inorganic

Pure substances are made of only one type of atom or molecule while mixtures are made of two or more different substances physically combined. The incorrect answers do not accurately represent the two main categories of matter.

Explanation

Pure substances are made of only one type of atom or molecule while mixtures are made of two or more different substances physically combined. The incorrect answers do not accurately represent the two main categories of matter.