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Which compound has covalent bonds?*
Ice, H2O(s), is classified as*
Which compound contains both ionic and covalent bonds?*
Which elements can react to produce a molecular compound?*
Which element reacts with oxygen to form ionic bonds?*
What is formed when two atoms of bromine bond together?*
In the compound KHSO4, there is an ionic bond between the*
Base your answers to questions 8 on the information below and on your knowledge of chemistry.
Some compounds of silver are listed with their chemical formulas in the table below.
Explain, in terms of element classification, why silver chloride is an ionic compound.*
Base your answers to questions 9 on the information below and on your knowledge of chemistry.
The elements in Group 17 are called halogens. The word “halogen” is derived from Greek and means “salt former.”
Identify the type of chemical bond that forms when potassium reacts with bromine to form a salt.*
Explain, in terms of element classification, why K2O is an ionic compound.*
Base your answers to questions 11 on the information below and on your knowledge of chemistry.
In a laboratory investigation, ammonium chloride was dissolved in water. Laboratory procedures and corresponding observations made by a student during the investigation are shown in the table below.
Identify two types of bonds in the solute.*
Base your answers to questions 12 on the information below.
One type of soap is produced when ethyl stearate and sodium hydroxide react. The soap produced by this reaction is called sodium stearate. The other product of the reaction is ethanol. This reaction is represented by the balanced equation below.
Identify the two types of bonds in the compound sodium stearate.*
Base your answers to questions 13 on the information below.
John Dalton, an early scientist, sketched the structure of compounds using his own symbols for the elements known at the time. Dalton’s symbols for four elements and his drawing of potassium aluminum sulfate are represented by the diagram below.
Today, it is known that the chemical formula for potassium aluminum sulfate is KAl(SO4)2•12H2O. It is a hydrated compound because water molecules are included within its crystal structure. There are 12 moles of H2O for every 1 mole of KAl(SO4)2. The compound contains two different positive ions. The gram-formula mass of KAl(SO4)2•12H2O is 474 grams per mole.
Identify one positive ion in the hydrated compound. Your response must include both the chemical symbol and charge of the ion.*
Base your answers to questions 14 on the information below.
During a fireworks display, salts are heated to very high temperatures. Ions in the salts absorb energy and become excited. Spectacular colors are produced as energy is emitted from the ions in the form of light.
The color of the emitted light is characteristic of the metal ion in each salt. For example, the lithium ion in lithium carbonate, Li2CO3, produces a deep-red color. The strontium ion in strontium carbonate, SrCO3, produces a bright-red color. Similarly, calcium chloride is used for orange light, sodium chloride for yellow light, and barium chloride for green light.
Identify the two types of chemical bonds found in the salt used to produce a deep-red color.*