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Chapter 8

QuestionAnswer
What is the greenhouse effect? Allows visible light energy to enter atmosphere but preventing heat energy from escaping
Global warming is due to the greenhouse gases preventing heat from Earth escaping into space. True
The primary greenhouse gas is carbon dioxide True
The primary source for the rising carbon dioxide levels is respiration of the Earth's growing population False
• The primary cause of increasing greenhouse gases is: • A) the burning of vast amounts of rain forests. • B) the production of CO2 by respiration. • C) the increased use of natural gas, petroleum and coal. • D)none. C
What is Stoichiometry? Numerical-Mathematical relationship between chemical quantities in balanced chemical equation
Stoichiometry is a chemist version of a recipe true
Can we predict amounts of products that forms based on amounts of reactants? yes
Can we predict how much of reactants are needed to form given amount of products yes
Can we predict how much of one reactant is required to completely react with another reactant? Yes
• Which of the following is TRUE? Stoichiometry shows the • A) numerical relationship between chemical. • B) prediction of amounts of products form in amounts of reactants. • C) prediction of how much of reactants are. • D all D
Given reaction: 2 Na(s) + Cl2(g) → 2 NaCl(s) conversion factor for chlorine to sodium chloride is: 1 mol Cl2 / 2 mol NaCl TRUE or FALSE true
What is a limiting reactant Reactant that is completely consumed in chemical reaction
What is theoretical yield Amount of product that can be made in chemical reaction bsed in amount of limiting reactant
What is the actual yield Amount of product actually produced by chemical reaction
What is percent yield (Actual yield/Theoretical yield) x 100
The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product. true
The limiting reactant is not necessarily the reactant with the least mass. True
Which of the following statements is TRUE? A) limiting reactant is completely consumed in reaction. B) theoretical yield is amount of product that can be made based on amount of limiting reagent. C) actual yield is amount of product actually produ D
When viewing a chemical equation, the limiting reactant can never be a chemical on the product side of the equation true or false? True
Can the precent yield ever be greater than 100 no
What is the limiting reactant in this equation? 2H2+O2= 2H2O Oxygen
What is enthalpy? A measure of heat evolved or absorbed in reaction
Enthalpy reaction is defined as amount of thermal energy or heat that flows when reaction occurs at constant pressure.
Sign of enthalpy depends on direction in which thermal energy flows when reaction occurs true or false true
Energy flowing out of chemical system is like a withdrawal and carries a --- sign negative
Energy flowing into a system is like deposit and carries --- sign positive
Stoichiometry of enthalpy reaction amount of heat emitted or absorbed when chemical reaction occurs depends on amounts of reactants that actually react.
Butane gas burning in a lighter fluid? Exothermic and - delta h
Reaction in cold packs used to ice athlete injuries. Endothermic and + delta H
Burning of wax in candle? Exothermic and - delta H
Ice melting endothermic
acetone evaporating endothermic
Created by: user-1984338
 

 



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