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Camponeschi

Camponeschi - chemistry part 3 (balancing equations, etc.)

QuestionAnswer
Law of Conservation of Mass Mass of the reactants = mass of products (cannot create or destroy an atom)
coefficient the large number in front of an atom or molecule - means not bonded
subscript small number that is on the lower right side of the element - means bonded together
Why do we balance equations? To show that no atoms were created or destroyed - to follow the law of conservation of mass
endothermic reaction a chemical reaction when the chemical absorbs heat from the environment and makes the chemical (environment) feel COLD
exothermic reaction a chemical reaction when the chemical releases heat from the environment and makes the chemical (environment) feel WARM
Which reaction is this? C6H12O6 + O2 --> CO2 + H2O RESPIRATION
Which reaction is this? CO2 + H2O --> C6H12O6 + O2 PHOTOSYNTHESIS
What is an acid? a chemical that has a sour taste and corrodes metal - such as lemon juice or stomach acid
Does an acid have a low or high pH? low pH
What is a base? a chemical that has a bitter taste and feels slippery such as soap or bleach
Does a base have a low or high pH? high pH
What happens when an acid and a base mix? the chemicals neutralize each other - make the pH of the product neutral (7)
In a chemical equation, where are the products? after the arrow - the arrow points to the products
In a chemical equation, where are the reactants? before the arrow - the arrow does not point to the reactants
In a chemical equation, what does the arrow mean? yield, turn into, changes to, etc.
When looking at a chemical equation, how can you determine if a chemical change has taken place? When the products are a DIFFERENT COMBINATION of elements - the compounds have a different chemical formula.
When looking at a chemical equation, how can you determine if a physical change has taken place? when the products have the SAME CHEMICAL FORMULA (same combination of elements) as the reactants
Chemical or physical change? N2 ---> N2 physical change
Na + Cl --> NaCl chemical change
Na + Cl --> Cl + Na physical change
KF + Cl --> KCl + F chemical change
ion charged atom
how is an ion formed? when an atom either gains or loses electrons
What is the force that holds an ionic bond together? the opposite charges of the ions is the bond - makes the atoms stick together
What types of element (metal or nonmetal) form ionic bonds metals bond with nonmetals
what type of ion do metals form? positive ions - they usually lose electrons
what type of ion do nonmetals form? negative ions - they usually gain electrons
what force holds a covalent bond together the sharing of valence electrons
What types of element (metal or nonmetal) form covalent bonds nonmetals with nonmetals
Ionic, Covalent or not possible? NaCl ionic - Na is a metal; Cl is a nonmetal
Ionic, Covalent, or not possible? CO2 covalent - carbon and oxygen are nonmetals
Ionic, Covalent, or not possible? CaMg not possible - both are metals which form positive ions that repel each other
Ionic, Covalent, or not possible? SF2 covalent - both are nonmetals
Ionic, Covalent, or not possible? Be2N3 ionic bond - Be is a metal, N is a nonmetal
Ionic, Covalent, or not possible? K2Be not possible - both are metals and both form negative ions which would repel each other
in what organelle does respiration take place? mitochondria
in what organelle does photosynthesis take place? chloroplasts
For the chemical equation CaCl2 + NaOH --> CaOH + NaCl, will you see HUGS? Yes - this is a chemical change
For the chemical equation CO2 (solid) --> CO2 (gas), will you see HUGS? No - this is a physical change
in the equation, CaCl2 + NaOH --> CaOH + NaCl, what are the products? CaOH + NaCl
In the equation, KF + Cl --> KCl + F, what are the reactants? KF + Cl
in the equation, Na + Cl <-- NaCl, what are the reactants? NaCl (the arrow is pointing to the products)
How is the law of conservation of energy maintained during an endothermic reaction energy is not created or destroyed - simply moving. the substance feels cold because it is absorbing energy from the environment and storing the energy in the chemical bonds (kinetic energy changing to potential energy)
How is the law of conservation of energy maitained during an exothermic reaction? energy is not created or destroyed - simply moving. the substance feels warm because it is releasing energy to the environment from the stored the energy in the chemical bonds (potential energy changing to kinetic energy)
how do you know when an acid/base reaction takes place? the pH of the products is between that of the two reactants - the product pH is neutral
rate of a chemical reaction how fast the reaction takes place
what factors affect the rate of a chemical reaction? temperature, surface area, concentration
how will increasing the temperature of a chemical affect the rate of the reaction increase the rate - because the molecules are moving faster - interacting with each other faster
how will increasing the surface area of a chemical affect the rate of the reaction increase the rate - more particles of the chemical are exposed and thus react (interact with other chemical) more
how will increasing the concentration of a chemical affect the rate of a chemical reaction increase the rate - the strong the concentration (the more of the chemical there is) the faster the reaction will be because there are more of the chemicals for interaction to take place
overall, what is affecting the rate of a chemical reaction? how easily the particles of the reactants can get together - the easier they can get together, the faster the reaction.
how will decreasing the temperature of a chemical affect the rate of the reaction decrease the rate - because the molecules are moving slower - interacting with each other more slowly
how will decreasing the surface area of a chemical affect the rate of the reaction decrease the rate - less particles of the chemical are exposed and thus react (interact with other chemical) less
how will decreasing the concentration of a chemical affect the rate of a chemical reaction decrease the rate - the less the concentration (the less of the chemical there is) the slower the reaction will be because there is less of the chemical for interaction to take place
Created by: camponel on 2012-05-02



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