Question

decide whether each sketch shows a sample of an element, a compound, or a mixture.
substance x: image of molecules with red and blue parts
options: element, compound, mixture
substance z: image of blue molecules
options: element, compound, mixture
substance t: image of red, blue, and red-blue molecules
options: element, compound, mixture
substance y: image of red, red-blue molecules
options: element, compound, mixture

Explanation:

Substance Z:

Step1: Analyze Substance Z's particles

Substance Z has only one type of molecule (all blue - blue molecules), and each molecule is made of the same type of atom (since the molecules are composed of identical blue atoms bonded together). By definition, an element is a pure substance made of only one type of atom. So Substance Z is an element.

Substance X:

Step1: Analyze Substance X's particles

Substance X has only one type of molecule, and each molecule is made of two different types of atoms (red and blue atoms bonded together). A compound is a pure substance made of two or more different types of atoms chemically bonded. So Substance X is a compound.

Substance T:

Step1: Analyze Substance T's particles

Substance T has three different types of particles: red - red molecules, blue - blue molecules, and red - blue molecules. A mixture is a combination of two or more pure substances (elements or compounds) that are not chemically bonded. Since there are multiple types of particles (different molecules) not chemically combined, Substance T is a mixture.

Substance Y:

Step1: Analyze Substance Y's particles

Substance Y has two different types of particles: red - red molecules and red - blue molecules. These are two different pure substances (an element - red - red molecules and a compound - red - blue molecules) that are not chemically bonded. So Substance Y is a mixture.

Answer:

s:

• Substance Z: element
• Substance X: compound
• Substance T: mixture
• Substance Y: mixture