From the jewelry descriptions given, select the homogeneous mixture or solution.
Answer??
10 carat (K) electroplated gold jewelry
24 carat (K) gold jewelry (i know this is pure gold)
18 carat (K) gold jewelry
Are these right?
CaCl2>>calcium chloride
NaF>>>sodium fluoride
The formulas are right.
10K electroplated Au means there is just a thin layer of 10K gold on the surface; the remainder of the jewelry is something else. 10K means 10/24 = 5/12 Au and 14/24 = 7/12 something else.
You're right that 24K Au is pure Au.
18K Au is 18/24 = 9/12 Au and 6/24 = 3/12 something else.
To determine whether the given substances are homogeneous mixtures or solutions, we need to understand their composition.
In the case of jewelry descriptions:
1. 10 carat (K) electroplated gold jewelry: This indicates that the jewelry consists of a base metal (likely non-gold) that has been electroplated with a layer of 10 carat (K) gold. Since the electroplating involves the deposition of a thin layer of gold onto the base metal, it can be considered a heterogeneous mixture rather than a homogeneous mixture or solution.
2. 24 carat (K) gold jewelry: This description specifically mentions "pure gold," indicating that the jewelry is made entirely of 24 carat (K) gold. Pure gold is a substance rather than a mixture, so it is not considered a homogeneous mixture or solution.
3. 18 carat (K) gold jewelry: This description suggests that the jewelry is made of a combination of gold and other metals in a specific ratio. In this case, it is still a mixture, but not a homogeneous one. The presence of other metals in the alloy makes it heterogeneous.
Regarding the second part of your question:
CaCl2 (calcium chloride): This compound is not a homogeneous mixture or solution since it consists of a specific combination of calcium and chloride ions. It is a compound, not a mixture.
NaF (sodium fluoride): Similar to calcium chloride, sodium fluoride is a compound rather than a mixture. It consists of sodium and fluoride ions combined in a specific ratio.
In summary, the homogeneous mixture or solution from the given options is not available among the jewelry descriptions provided, and neither calcium chloride nor sodium fluoride represent homogeneous mixtures or solutions.