Chapter 17 Review

Chemical Reaction- A process that rearranges chemical bonds to create new substances

Reactants- the substances that are combined and changed in the chemical reaction

Products- the new substance that results from a chemical reaction

Chemical equation- an equation of chemical formulas that shows the exact numbers of atoms and compounds in a chemical reaction

Exothermic- a reaction is exothermic if it releases more energy than it uses

Evidence of chemical change

• Bubbles
• Turns cloudy
• Change in temperature
• Color change
• Turns into a precipitate

Symbols

• (s) substance is a solid
• (l) substance is a liquid
• (g) substances is a gas
• (aq) substance is a solution (aquias)

Difference in two reactions

• Chemical Reaction is that outer electrons are involved, atoms are arranged into new molecules but it stays the same atom, and it uses very little energy
• Nuclear Reaction is the nucleus is involved, atoms may change into another element, and alot of energy is involved

E=mc^2

• This means mass can be converted to energy when multiplied by the speed of light squared

Lisa Meitner

• She was born Vienna, Austria on November 7, 1878.
• She led the discovery of nuclear fission of uranium and thorium in 1938.
• In 1917 she discovered a new element,Protactinium.
• She died on October 27, 1968 in Cambidge England.
• After her death she had an element named after her, Meinterium.

Balancing chemical equations

• Count all your elements on both sides.
• If they're equal, then you're good. If they're not, then you need to add coefficients to both sides until the equation is balanced.

Questions

• What are the five characteristics of a chemical change?
• When energy is a product of a chemical reaction, what type of chemical reaction occured?
• How many carbon, hydrogen and oxygen atoms are in CH4 + 2O2 ---> CO2 H2O?
• What type of reaction is the equation in number three?
• What does the symbols in E=mc^2 mean?
• When (plus energy) is on the reactant side it is what reaction?
• What does the symbols (s), (l), (g), and (aq) mean?

Answers

• Bubbling, cloudiness, temperature, color and a precipitate.
• Exothermic reaction.
• C = 1, H = 4, O = 4
• It is a combustion reaction
• It means mass can be converted to energy when multiplied by the speed of light squared.
• It is endothermic.
• s= solid, l= Liquid, g=gas, aq= aquias or is a solution.

Balancing Equation Game!!!!

• H2O2 --> H2 + O
• CO2 --> C + O
• O2He3 --> He3 + O2
• LiB5 --> Li2 + B10
• H2O + O --> H + O4

BALANCING Equations Con.

• NaCl2 --> Na2 + Cl4
• H2O4+ O10 --> H2O14
• Al3O2 + H4 --> H2O + Al
• Fe3 + H2 + O2 --> Fe + H2O
• O2C6H12 --> O4 + C6 + H12

Bonus!!!!!!

LiFeH12O24 --> Li2Fe2 + C6 + H12 + O24

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