Question

A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas.Which group of statements best describe all of the materials he is using in the investigation?

A. They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter.
B. They are each made of matter. Some are compounds and some are elements. They all contain atoms.
C. They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms.
D. They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

Answer 1

The materials involved in the investigation are made of matter, with silver and oxygen gas being elements, and water and carbon dioxide being compounds, all of which contain atoms.

Step-by-step explanation:

The question asks which group of statements best describes the materials (water, silver, carbon dioxide, and oxygen gas) being used in a scientific investigation. The correct descriptions for these materials are encapsulated in option B: They are each made of matter some are compounds, and some are elements. they all contain atoms. Specifically, water (H₂O) and carbon dioxide (CO₂) are compounds, as they are composed of two or more different elements chemically bonded together. Silver (Ag) and oxygen gas (O₂) are elements although oxygen gas is diatomic meaning it consists of two atoms of the same element bonded together.All of these substances are made of matter, which takes up space and has mass.

A substance made of only one type of atom is known as an element, whereas a compound such as water consists of molecules formed from two or more different kinds of atoms. Oxygen gas, while also being an element, exists naturally as two atoms bonded together, forming a molecule. Recall that silver is a pure element and does not form bonds with other silver atoms to create molecules under normal conditions. This distinguishes it from a compound or a molecule like water, which is always made up of hydrogen and oxygen atoms in a 2:1 ratio.