Question | Answer |
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. |