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physical science C5
Physical Science Chapter 5
| Question | Answer |
|---|---|
| chemical reactions do what | change substances |
| bonds between atoms are... | broken, formed, or broken with new ones formed |
| atoms get... | rearranged |
| they are not ( ) to the same thing they we ( ) to before | bonded, bonded |
| the result of changing chemical reactions is.. | new substances |
| these substances have ( )( ) than what we started with. | different properties |
| ( ) ( ) of atoms means different properties of substances | new arrangement |
| ( ) substances may show signs that a chemical ( ) is happening. | chemical, reaction |
| what may be produced | gas(bubbles, odor) |
| what change may occur | color change may occur |
| a ( ) may form when ( ) ( ) are mixed | solid, 2, Liquids |
| we use ( ) to show chemical reactions | equations |
| reactants are on the ( ) side of the arrow | left |
| products are on the ( ) side of the arrow | right |
| the arrow means ( ) or ( ) | yields or procedures |
| it is easier to represent a ( ) ( ) with ( ) than it is to state it | chemical, reaction, symbols |
| it takes( ) to break ( ) between ( ) | energy, bonds, atoms |
| we could us( ) energy, ( ), and ( ) | heat energy, electricity, and light energy |
| when new bonds form between atoms, ( ) is released | energy |
| ( ) and ( ) energy is released ina fire | light and heat |
| energy is ( ) | conserved |
| the total energy ( ) 3words | stays the same |
| you cannot make more ( ) than what you ( ) with | energy, started |
| the energy that is stored in the chemical bonds between atoms | chemical energy |
| this reaction gives off heat energy from reactants to the environment | exothermic reactions |
| exothermic reactions ( ) up their environment | heat |
| other forms of energy that could be given off are ( ) ( ) ( ) | electricity, light, and sound |
| this reaction takes in heat energy form the environment into the reactants. | endothermic reaction |
| endothermic reactions ( ) down their environment | cool |
| instan ice packs is an example of which reaction(endothermice or exothermic) | endothermic |
| a process doesnt have to be a ( ) ( ) to be ( ) or ( ) | chemical reaction, endothermic or exothermic |
| melting ice is an example of what? (exothermic or endothermic) | exothermic |
| when water releases heat energy to its environment to get cold enough to freeze is not a ( ) ( ) | chemical reaction |
| puts substances together | synthesis reaction |
| breaks substances apart | decompostition reaction |
| always has oxygen as a reactant(fire) | combustion reaction |
| an element trades places with another one | single displacement reaction |
| 2 elements trade places with each other | double displacement reaction |
| ( ) can transfer from one ( ) to another dureing ( ) ( ) | electrons, atom, chemical reactions |
| an atom losing electrons | oxidation |
| an atom gaining electrons | reduction |
| we call oxidation and reduction reactions what | redox reations |
| most reactions involve( ) and ( ) | oxidation and reduction |
| fragments of molecules that have at least one electron available for bonding | radicals |
| good radicals-we use radicals to ( ) long ( ) | build, molecules |
| long molecules made of many small molecules bonded together(example of a good radical) | polymers |
| we can us radicals to make new ( ) | substances |
| bad radicals-these can start ( ) that we dont want because they are ( ) | reactions, unstable |
| ( ) can interfere with ( ) ( ) in ( ) things and cause ( ) to cells | radicals, chemical reactions, damage |
| we cannot have more ( ) of an ( ) on the ( ) side of the reaction than on the ( )side | atoms, element, left, right |
| in chemical reactions, elements of one kind ( ) ( ) change to elements of another kind | do not! |
| you can only change number (6words) to make things balance | in front of atoms or molecules |
| the total number of each ( ) must be the same on each ( ) of the ( ) ( ) | side of the reaction arrow |
| first, figure out what ( ) you have and (4words) | elements, how many you have |
| next put ( ) in front of ( ) or ( ) to make things ( ) | numbers, atoms or molecules, balance |
| ( ) are called coeffiecients | molecules |
| finally make sure that ( ) of ( ) balance and change ( ) if necessary | numbers, atoms, coefficients |
| chemical reactions occur at ( ) ( ) | different speeds/rates |
| many ( ) affects the ( ) of chemical ( ) | factors, rates, changes |
| most reactions go faster at higher temperatures | temperature |
| reactions speed up with larger surface area of reactants | surface areas |
| high concentration of reactants makes reaction faster than low concentration of reactants | concentration |
| high pressure may speed up reactions | pressure |
| big molecules react more slowly than small ones | molecule size |
| these are substances that change the rate of the chemical reaction | catalysts |
| most ( ) speed up the ( ) | catalysts, reaction |
| ( ) are catalysts that speed up reactions in ( ) things | enzymes, living |
| some chemical reactions go completely from ( ) to ( ) | reactants to products |
| other ( ) ( ) go part way or are ( ) | chemical reactions, reversible |
| we write them with ( ) arrows | 2 |
| is a balanced condition in which a reaction and its revers occur at the same time and at the same speed | equilibrium |
| for every ( ) going to the ( ) there is a ( ) going to the ( ) | reaction, right, reaction, left |
| if a change is made to a system in equilibrium, then the system shifts to oppose the change to re-set the equilibrium | LeChatelier's Principle |
| <--> means | equilibrium |
Created by:
darrl
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