Elements and Compounds Test

How is an element different than a compound?

• An element is made of only one kind of atom.

• An element is a pure substance.

• A compound is made of only one kind of atom.

• A compound is a pure substance.

Which of the following chemical symbols represents silver?

• S

• Si

• Ag

• Au

Which statement best explains the difference between the substances CO and Co.

• CO is an element, but Co is a compound.

• CO contains calcium, but Co does not.

• CO is made of two elements, but Co is made of only one.

• CO is a chemical symbol, but Co is a chemical formula.

A student investigates how different elements change in appearance when mixed. Which of the following could be an element used in this investigation?

• CN

• Ca

• NaI

• H₂SO₄

A student sees a medicine for bone health at a pharmacy. The label below indicates that it contains the element represented as Sr. Which element does the medicine contain?

• Sulfur

• Strontium

• Seaborgium

• Silver

Which notation represents a molecule of an element?

• CO

• H₂

• HI

• H₂O

How many different types of elements are represented in the chemical formula NaHCO₃

• 2

• 3

• 4

• 5

Which elements make up the molecule MgF₂?

• Magnesium, Fluorine

• Magnesium, Iron

• Magnesium, Gallium, Iron

• Magnesium, Gallium, Fluorine

The Earth, living matter, oceans, and atmosphere are composed of-

• so many different elements that they cannot all be listed.

• all of the elements on the Periodic Table equally.

• a limited number of known elements.

• no elements at all.

This particle diagram represents a sample of matter. Which describes the composition of the sample?

• A mixture of elements and compounds

• A mixture of elements

• A single compound

• A mixture of compounds