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| Define: Quantative | "Quantative" means that an object is "observable" and can be measured in "numbers" |
| Define: Qualitative | "Qualitative" means that an object can be seen but not really measured in "numbers" (colors; smell; feelings) |
| What is a "balanced" equation? | A "balanced equation" is when the "reactants (what is put into the equation)" "equals" the "product (what comes out of the equation)" in an "equation"> |
| Define: Reactants | The "reactants" are what into a chemical equation and are on the "left side" of the equation |
| Define: Product | The "product" is what comes out of a chemical equation and is on the "right side" of the equation. |
| Why do chemists use "balanced equations" for? | Chemists use "balanced chemical equations" as a basis to "calculate" how much "reactant" is needed or "product" is formed in a reaction. |
| Define: Stoichiometry | "Stoichiometry" is a "portion of chemistry" "dealing with" "numerical relationships" in "chemical reaction"; the calculations of quantities of substances involved in "chemical equations" are "balanced". |
| How can a "balanced chemical equation" be interpreted in term of "different quantities (5 ways)? | A "balanced chemical equation can be interpretated by the following: 1) numbers of atoms; 2) molecules (a neutral group of atoms); 3) Moles; 4) mass (amount of matter); and, 5) Volume. |
| Define: Atom | An "Atom" is the smallest particle of an element that retains its identity in a chemical reaction. |
| Define: Molecules | A "Molecule" is the "neutral group" of atoms joined together by Covalent Bonds. |
| Define: Moles | A "Mole" is the amount of a substance that contains "6.02 * 10^23" representative particles |
| Define: Volume | "Volume" is the measure of the space occupied by a sample of matter. |
| What happens to the atoms and their mass in every "chemical reaction"? | In every "chemical reaction", "mass" and "atoms" are "conservered". |
| What is a "mole ratio"? | A "mole ratio" is a conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles. |
| What happens in "chemical calculations"? | In "chemical caculations", "mole ratios" are used to convert between moles of reactants and moles of products. |
| What does "W" in a "mole ratio"? | In a "mole ratio", "W" is the unknown quantity in a "mole ratio". |
| What is a "Laboratory Balance"? | A "Laboratory Balance" is a scale to measure the weight of a substance. |
| What is done to determing the amount of a substance in a laboaratoy? | The amount of a substance is usually determined by measuring its "mass in grams". |
| What is used to measure the amount of substance in the reactant and product of a chemical equation? | The "mole interpretation" of a "balanced equation" is the basis for this calculation - if the given sample is "measured in grams" the mass can be converted to "moles" using the "molar mass" (and the "molar ratio") - by using "moles" the amount of a substance can be more easily calculated and determined in a labaratory. |
| What can the "mole-mole calculations" be used to determine. | In a "mole-mole calculation", the unknown can be either a reactant or a product. |
| Can any laboratory balance measure the mass in noles? If not, what is then done to measure the "mass" in "moles" | No, no laboratory balance can measure the mass in moles. Therefore, first the mass is measured in "grams" and then converted by "molar mass formula" to "moles". |
| Define: Law of Conservation of Mass | The "Law of Conservation of Mass" in any "physical change" or "clemical reaction" "mass is conserved; "mass can not be'created' nor can it be 'destroyed'." |
| How are "mass-mass" problems solved? | "Mass to mass problems" are solved basically the same way was "mole-to-mole problems". |
| How can one obtain "mole ratios"? | One can obtain "mole ratios" from "a balanced chemical equation". |
| Define: STP | "STP" stands for "Standard Temperature and Pressure". |
| How can "moles ratios" be expressed? Then, what kind of calculations can then be made? | "Mole ratios" can be expressed in the following ways: 1) in numbers of representative particles; 2) units of mass; and, 3) volumes of gases at STP. The "calculations" that can be used are the following: 1) mass-volume; 2) particle mass; and, 3) volume-volume. |
| What happens during a typical "Stoichiometric problem". | In a "Stoichiometric problem" the given quantity is first converted to moles. Then the mole ratio from the balanced equation is used to calculate the number of moles of the wanted substance. Finally, the moles are converted to any other unit of measurement related to the unit mole, as the problem requires. |
| What are "three(3) kinds" of "Stoichiometric problems"? | The three(3) kinds of "Stoichiometric problem" are the following: 1) mass-mass; 2) mass-mole; and, 3) mole-mass. |
| What does "one mole" of a gas equal to? | "One mole" of a gas equals to "22.4 liters(l) at STP". |
| In a "Stoichiometric problem" will the "units of given quantity" be the same as the "units of the wanted quantity"? | No, a "Stoichiometric problem" the "units of given quantity" will NOT necessarily be the same as the "units of the wanted quantity"? |
| What do the "coefficients" in a "chemical equation" indicate? | The "coefficients" in a "chemical equation" indicate the "relative number of particles" and "the realtive of moles" of "reactants and products. |
| What do the "coefficients" indicate in a "gaseous reaction"? | The "coefficients" in a "gaseous reaction indicate "relative amounts of each gas".` |
| How can one use "volume ratios"? | One can use "volume ratios" for "reactions involving gases" and the can be used "in the same way" as "mole ratios". |
| What do the "coefficients" in a "balanced chemical equation" indicate? | The "coefficients" in a "balanced chemical equation" indicate "the relative number of moles". |
| What do the "coefficients" in a "balanced chemical equation involving gases" indicate? | The "coefficients" in a "balanced chemical equation involving gases "indicate " the relative volumes of interacting gases". |
