Question | Answer |
What is an Element? | a pure substance that cannot be separated into simpler substances by physical or chemical means |
What is a compound? | It is a combination of two or more different elements that are chemically combined |
What is a mixture? | A mixture is a combination of two or more pure substances in which each pure substance keeps its individual chemical properties. |
Difference between Homogenous and Heterogeneous mixtures. | Homogenous:When the 2 substances are equally distributed. ex. Lemonade, Salt Water
Heterogeneous: When the components are not equally distributed. Ex. Italian Dressing |
Filtration | Filtration is a technique that separates the components of a mixture using a porous barrier. |
Distillation | When you boil two substances to seperate them or to boil a substance out of the mixture. |
Crystallization | a separation technique that results in the formation of pure, solid particles of a substance that had been dissolved in a solution. |
Chromatography | is a technique that separates the components of a mixture on the basis of the tendency of each component to travel across the surface of another material. |
What is Matter and what four states does it happen in? | anything that has mass and takes up space.
It can be in a solid form, liquid, gas, or plasma. |
What is weight? | weight is a measure of the gravitational pull on matter |
Physical Properties of a substance | Extensive: Mass, Density, Melting Point, Boiling Point, Temperature
Intensive: Color, Hardness, Malleability, Conductivity, Odor |
Chemical Properties | Potential to Rust, Potential to Explode, Potential to react with acid, Potential to decompose |
Chemical Properties | Potential to Rust, Potential to Explode, Potential to react with acid, Potential to decompose |
physical change | A change that does not affect the basic nature of a substance |
Chemical Properties | Potential to Rust, Potential to Explode, Potential to react with acid, Potential to decompose |
physical change | A change that does not affect the basic nature of a substance. Ex: Melting Ice |
Chemical Change | A change that affects the basic nature of a substance. |
Potential Energy | measures the distance an object is from the earth’s surface |
Kinetic Energy | the energy of motion |
What is The Law of Conservation | The law of conservation of energy states that energy cannot be created or destroyed; the total amount of energy in the universe is constant |