Which of the following are Physical Properties
Melting point, hardness, luster, odor
Combustion, reacts with acid, water and air
Tarnishes, rust, ph, rots, food digested
Physical change?
Cut apple, heat changes, alcohol evaporates, ice melts
Tarnishes, rust, ph, rots, food digested
Combustion, reacts with acid, water and air
Melting point, hardness, luster, odor
Physical properties: Melting point, hardness, luster, odor
Physical change: Cut apple, heat changes, alcohol evaporates, ice melts
None of the given options are physical changes.
The physical properties among the given options include:
1. Melting point: This is the temperature at which a substance changes from solid to liquid state.
2. Hardness: This refers to the resistance of a material to being scratched or indented.
3. Luster: This describes the appearance or quality of light reflected from the surface of a substance.
4. Odor: This relates to the characteristic smell associated with a particular substance.
Regarding the physical changes:
1. Cut apple: Cutting an apple is a physical change as it alters the shape and size of the apple, but does not change its chemical composition.
2. Heat changes: When heat is applied to a substance, it can cause changes such as expansion or phase transitions, which are physical changes.
3. Alcohol evaporates: Evaporation of alcohol is a physical change since it involves a change in phase from liquid to gas.
4. Ice melts: Similarly, ice melting is a physical change as it represents the phase transition from solid to liquid.
The following options are not physical properties or physical changes:
1. Combustion, reacts with acid, water, and air: These indicate chemical reactions rather than physical properties or changes.
2. Tarnishes, rust, pH, rots, food digested: These also involve chemical changes rather than physical properties or changes.
To determine which of the given options are physical properties, we need to understand what physical properties are. Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. In other words, physical properties describe how a substance appears or behaves without undergoing a chemical reaction.
Looking at the given options:
1. Melting point: This is a physical property because it is the temperature at which a substance changes from a solid to a liquid state.
2. Hardness: This is a physical property because it describes the resistance of a solid to being scratched or dented.
3. Luster: This is a physical property because it describes the shininess or reflective quality of a substance.
4. Odor: This is a physical property because it describes the smell associated with a substance.
Therefore, the physical properties among the given options are melting point, hardness, luster, and odor.
Moving on to the next question regarding physical changes, let's analyze the options.
1. Cut apple: This is a physical change because the shape and size of the apple have changed, but it is still the same substance.
2. Heat changes: This is not a specific example. Heat changes can lead to various physical changes in different substances, such as expansion or evaporation.
3. Alcohol evaporates: This is a physical change because the alcohol changes from a liquid to a gas without any change in its chemical composition.
4. Ice melts: This is a physical change because the solid ice changes into liquid water.
Regarding the options provided for tarnishes, rusts, pH, rots, and food digested, these are not examples of physical changes. They involve chemical reactions or processes that result in the alteration of a substance's chemical composition.
Finally, we return to the options for physical properties, which we have already discussed. The options melting point, hardness, luster, and odor are indeed physical properties.