Quiz 2 Pure Substances

A section of the Periodic Table is provided. What is the chemical symbol for Potassium?

• P

• 19

• Potassium

• K

What is the chemical symbol for Gold (Number 78) on the Periodic Table of Elements?

• G

• Go

• Au

• AU

Compounds are different than elements because compounds are-

• combinations of two or more elements

• not able to be broken down into parts

• made from the same type of atoms

• a pure substance; elements are not

Carbon is considered an element, while carbon dioxide is considered a compound. Carbon dioxide is considered a compound because it is -

• a gas at room temperature

• 2 or more elements chemically combined

• given off by green plants

• useful to human beings

The smallest particle of any element is known by which of the following terms?

• Element

• Chemical

• Atom

• Compound

The hydrospere is mostly water or H₂O, H₂O is a chemical combination of

• Helium and Oxygen

• Hydrogen and Oxygen

• Oxygen and Silicon

• Carbon, hydrogen, oxygen and nitrogen

_{NaCl is a chemical combination of}

• 2 elements - NaC and l

• 2 elements - Na and Cl

• 1 elements - Nickle

• 4 elements - N, a, C, and l

The oceans are primarily composed of which two elements?

• Carbon and hydrogen

• Calcium and Silicon

• Hydrogen and oxygen

• Nitrogen and phosphorus

Tags

NGSS.MS-PS1-1

The atmosphere of Earth is comprised of 21% oxygen and 78% ______________

• carbon

• hydrogen

• silicon

• nitrogen

Which elements are most abundant in the plants and animals that make up the biosphere?

• Sulfur, hydrogen, oxygen and gold

• Nitrogen and oxygen

• Oxygen and Silicon

• Carbon, hydrogen, oxygen and nitrogen