Identify each as a homogenous mixture, a heterogeneous mixture, or a pure substance: Air. Sand mixed with water. Drinking water. Soil Ozone (
) I. Heterogeneous mixture. II. Homogeneous mixture. III. Pure substance QUESTION 10 Identify each as a homogenous mixture, a heterogeneous mixture, or a pure substance: Crude oil. Sand mixed with water. Tap water. Soil Ozone A. Homogeneous mixture. B. Heterogeneous mixture. C. Pure substance
The Correct Answer and Explanation is:
Here’s the classification for each substance:
1. Air:
II. Homogeneous mixture
Air is considered a homogeneous mixture because it consists of various gases, primarily nitrogen, oxygen, and small amounts of other gases like carbon dioxide and argon, which are evenly distributed throughout. You cannot see the individual components, and it behaves uniformly in its physical properties.
2. Sand mixed with water:
I. Heterogeneous mixture
Sand mixed with water is a heterogeneous mixture because the sand particles do not dissolve in water. Instead, they remain visible and can be separated through filtration. The composition is not uniform throughout the mixture.
3. Drinking water:
II. Homogeneous mixture
Drinking water is typically a homogeneous mixture when it is pure or treated. It contains various dissolved substances such as minerals, salts, and possibly chlorine, but the composition is evenly distributed. However, if impurities are present, it might be classified as a heterogeneous mixture.
4. Soil:
I. Heterogeneous mixture
Soil is a heterogeneous mixture because it consists of many different components such as sand, silt, clay, organic matter, and water. These components are not uniformly distributed, and their proportions can vary from one location to another.
5. Ozone (O₃):
III. Pure substance
Ozone is a pure substance because it consists of a single type of molecule made up of three oxygen atoms. It has a consistent chemical composition and distinct physical properties, so it qualifies as a pure substance.
For the second set of substances:
1. Crude oil:
A. Homogeneous mixture
Crude oil is a complex mixture of hydrocarbons that appear uniform to the naked eye. Though it contains many different compounds, it is considered a homogeneous mixture because its physical properties, like density and viscosity, are consistent throughout.
2. Sand mixed with water:
B. Heterogeneous mixture
This is the same as in the previous set: the sand does not dissolve, and the components are easily distinguishable, making it a heterogeneous mixture.
3. Tap water:
A. Homogeneous mixture
Tap water is typically a homogeneous mixture, as it contains dissolved minerals and chemicals that are evenly distributed throughout. However, if there is contamination, it might become a heterogeneous mixture.
4. Soil:
B. Heterogeneous mixture
Soil, like in the previous set, is a heterogeneous mixture with varied components like organic matter, minerals, and water.
5. Ozone (O₃):
C. Pure substance
Again, ozone is a pure substance because it consists entirely of one type of molecule, and it has a constant chemical composition.
