Multiple Choice
Which action is performed by the slightly charged parts of a water molecule when salt (such as NaCl) dissolves in water?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following minerals is the main component in the cement slab commonly found in houses?
A
Portlandite (Ca(OH)_2)
B
Quartz (SiO_2)
C
Gypsum (CaSO_4 · 2H_2O)
D
Calcite (CaCO_3)
Verified step by step guidance1
Understand that cement slabs in houses are primarily made from materials that result from the hydration of cement compounds, which typically involve calcium-containing minerals.
Recall that Portlandite, with the chemical formula \(\text{Ca(OH)}_2\), is a product formed during the hydration of Portland cement and is a major component in hardened cement paste.
Recognize that Quartz (\(\text{SiO}_2\)) is a common mineral in sand and aggregates but is not a main chemical component of cement itself.
Note that Gypsum (\(\text{CaSO}_4 \cdot 2\text{H}_2\text{O}\)) is added to cement to control setting time but is not the main component of the hardened cement slab.
Understand that Calcite (\(\text{CaCO}_3\)) is a common mineral in limestone and marble but is not the primary component in cement slabs; it may be present as an aggregate or filler.
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