Term | Definition |
Activation Energy | What is needed to start a chemical reation |
Arrow | you read the arrow as "yields" in a chemical reaction |
Characteristics of a Chemical Reation | changes in energy or changes in properties ( produce a gas)(bubbles form), color change, precipitate forms or temperature change. |
Chemical Changes | alter the chemical properties of matter; new substances with new properties are formed |
Chemical Equations | a shorter, easier way to show a chemical reactions by using symbols instead of words |
Coefficient | a number placed in front of a chemical formula in an equation. tells how many atoms or molecules of each reactant and product take part in the reactant. |
Conversation of Mass | the amount of matter involved in a chemical reaction does not change. the total mass of the reactant must equal the total mass of the products. |
Controlling rates of reaction | concentration, temperature, surface area, catalysts, enzymes, and inhibitors. |
Decomposition Reaction | a compound breaks down into simpler substances |
Endothermic Reaction | an observable change in energy that shows a chemical reaction took place. a reaction that takes heat from the solution absorbs energy and makes it feel cooler. |
Exothermic Reaction | an observable change in the energy that shows a chemical reaction took place. A reaction that releases heat. gives off energy, makes it feel warmer, most chemical. |
Physical Changes | alter only the physical properties of matter no new substances are formed. Can change in size, shape or color change in phase ( by increasing or decreasing temperature: solid, liquid, gas. |
Precipitate | a solid that forms from solution during a chemical reaction, observable change that shows a chemical reaction took place. |
Products | the materials you have after a chemical reaction, written on the right side of the formula. |
Reactants | the materials you have at the beginning of the chemical reaction, written on the left side of the formula. |
Replacement Reaction | one part of a compound is displaced by an element or compound from another substance ( also called displacement reaction) |
States of Matter | solid, liquid, gas |
Subscripts | show the number of atoms of an element in a molecule or the ratio of elements in a compound |
Synthesis reaction | two substances combine to form a new compound ( also called composition reaction) |