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chemical and physical equations

QuestionAnswer
The temperature at which a solid can change to a liquid. The temp. at which a pure substance melts is unchanging under constant conditions. Lead is a very heavy, matter metal.
The melting point of a pure substance can be used a s a physical property for identification. Ice melts to form liquid water at 0 degrees Celsius or 32 degrees Fahrenheit. Chemical properties can be recognized when substance react or do not react chemically with one another.....when they under and go.
The temperature at which a liquid boils. During the process of boiling a substance the substance changes from a liquid to a gas. Boiling begins when the liquid starts to form bubbles throughout, that grow larger, rise to the surface and burst. The ability of a substance to burn is a chemical property that involves a substance reacting quickly with heat to produce heat and light. This process is called burning.
As long as the substance is boiling the temperature of the liquid remains constant. Boiling point is unchanging under constant conditions for a given conditions. The substance of a substance to frust is a chemical property that involves a substance reacting slowly with rain. This process is called rust.
Boiling point is unchanged under constant conditions for a given substance and can be used as a physical property for identification of a substance. The boiling for pure water at sea level is 100 degrees Celsius or 212 degrees fahrenheit. Physical changes do Not change the composition of a substance, only the physical properties. Evidences of a physical change include; Change in state of matter. Change in size or shape.
Density is a property that describes the relationship between the mass of a material and its volume. Substances that are are denser contain more matter in a given volume. When a substance changes from one state of matter to another. The composition of the substance stays the same. When a substance changes directly from a gas to a solid; the forming of frost from water vapor, or form a solid.
The density of a substance will stay the same no matter no matter how large or small the sample of the substance so this how density can be used as a physical property for identification of a substance. When a substance changes in size or shape. The composition of the substance stays the same.
Chemical changes result in the formation of one or more new substance with new chemical properties and physical properties. When a substance changes color, the chemical composition of the substance may have changed. It is possible to have a color change without a chemical change.
When a substance changes its size or shape. Examples = cutting, tearing, dissolving, stretching, and wrinkling. Chemical changes result in the formation of one or more new substances with new chemical and physical properties.
When a substance changes color, the chemical composition of the substance may have changed. When a substance is combined with another substance, there may be an increase or decrease in temperature.When 2 solutions are combined, they may form a solid substance.
This solid substance is called a precipitate and indicates that chemical changes has occurred. Carbon dioxide is combined with lime water and chalk is formed as a precipitate. When solid or liquid substances are combined, they may form gas bubbles. The formation of the gas may indicate that a chemical reaction has taken place.
Created by: 10014378
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