Elements and Compounds

Pure substances are classified into elements and compounds. Elements are the simplified form of matter. Which of the following is an element?

• Carbon monoxide

• Germanium

• Glucose

• Nitrous oxide

Which of the following is the simplest form of substance?

• solution

• compound

• element

• mixture

When one or more substance is combined it is called __________________.

• compound

• element

• mixture

• solution

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following statements describes an element?

• It contains only one kind of atom.

• It can be decomposed by ordinary chemical means.

• It is composed of atoms of two or more elements that bond together.

• It has unique properties that are different from the properties of its individual elements.

Which of the following statements describes a compound?

• It contains only one kind of atom.

• It can be separated by physical means.

• It cannot be decomposed into simpler types of substances.

• It consists of atoms of two or more different elements bond together.

Tags

NGSS.MS-PS1-1

Methane is a colorless odorless gas compound. Given the structure, what elements compose the methane?

• Helium and Carbon

• Helium and Calcium

• Hydrogen and Carbon

• Hydrogen and Calcium

Tags

NGSS.MS-PS1-1

A Grade 7 student planned to have an experiment. He prepared the materials namely sodium bicarbonate, hydrogen peroxide, iodine, and iron. Which of these materials are compounds?

• Sodium bicarbonate and hydrogen peroxide

• Sodium bicarbonate and iodine

• Hydrogen peroxide and iodine

• Hydrogen peroxide and iron

Tags

NGSS.MS-PS1-1

Which of the following is NOT a compound?

• Monosodium glutamate

• Sodium chloride

• Citric acid

• Krypton

What elements made up the compound Carbon dioxide?

• Carbon and Oxide

• Carbon and Oxygen

• Carbon and Hydrogen

• Carbon and Carbon

Tags

NGSS.MS-PS1-1

Which of the following statements is true about the illustrations below?

• Illustrations I and IV are elements; Illustrations II and III are compounds.

• Illustrations II and III are elements; Illustrations II and IV are compounds.

• Illustrations I and II are elements; Illustrations III and IV are compounds.

• Illustrations III and IV are elements; Illustrations I and II are compounds.

Tags

NGSS.MS-PS1-1