CK-12 Chemical Symbols & Formulas

How many hydrogen atoms are in one molecule of the compound C12H22O11?

22

The numbers written after each chemical symbol in a formula are called subscripts. The subscript of hydrogen in H3PO4 is 3. The subscript for phosphorus is assumed to be 1 because no subscript is shown. Ethanol is a compound that consists of carbon, hydrogen, and oxygen in a 2:6:1 ratio. What is the correct chemical formula (with subscripts) for ethanol?

C2H6O

The chemical symbols for radon, copper, and iron are _____, _____, and _____ respectively.

Rn, Cu, Fe

Name the elements in the chemical formula. CaCl2

calcium, chlorine

true or false: "Zi" is the chemical symbol for zinc.

false

true or false: In the periodic table, the symbol 'S' is used for silicon and the symbol 'Si' is used for silver.

false

A chemical _____ is a set of chemical symbols that indicate the elements in a compound and the relative proportions of those elements.

formula

A handful of elements have been known since ancient times. Their symbols are based on what language?

latin

Name the elements in the chemical formula. NiSO4

nickel, sulfur, oxygen

Name the elements in the chemical formula. PF5

phosphorus, fluorine

Name the elements in the chemical formula KCN (with commas)

potassium, carbon, nitrogen

Chemical symbol 'Ag' is used for which of the following elements?

silver

A one- or two-letter designation of an element is named as a chemical ______ .

symbol

true or false: Abbreviations called chemical symbols are used to represent the elements.

true

true or false: Phosphoric acid is a compound that is found in carbonated soft drinks. Its formula is H3PO4. The element ratio in phosphoric acid is 3 parts hydrogen for every 1 part phosphorus for every 4 parts oxygen.

true

true or false: The chemical symbol for arsenic is 'As'.

true