Honors science Chapter 5 Sec 1-3

Chemical reaction

When chemical bonds break or form

Precipitate

A solid that can appear during chemical reactions

Endothermic reaction

When energy is absorbed, temp drops

Exothermic reaction

When energy is released, temp rises

Subscripts

The small numbers that determine ratios

Coefficients

The big numbers in front of formulas, multiplies small numbers

Chemical equation

Shows chemical reactions

Reactant

Part of a chemical equation, the part that gets changed

Product

Part of a chemical equation, what you get from reaction

Yield

The arrow in chemical equations

Synthesis

Two or more substances combining to make a more complex thing

Decomposition

Breaks down into simpler products

Replacement

One element replaces another

Activation energy

The boost of energy to get chemical reactions started

Concentration

The amount of matter together, how close or apart

Catalyst

Material increasing rate of chemical reaction

Inhibitor

Material decreasing rate of chemical reaction

Enzymes

Substance produced by living organism for a biochemical reaction

Conservation of mass

Mass cannot be created or destroyed

Formula mass

Number of atoms times atomic mass= formula mass

Evidence of chemical reaction

Change in energy, temperature, production of gas, production of precipitate, color change

Exothermic activation energy memory clue

Exothermic just needs to let it all out

Endothermic activation energy

Needs energy to keep going

Exothermic activation energy

Does not need energy to keep going