| A | B |
|---|
| After a chemical change, the final product is ________? | different than what you started with. |
| In physical changes, the composition _______? | remains the same as you started with. |
| In a chemical equation, the materials on the left side of the equal sign are called _________? | reactants. |
| In a chemical equation, the materials on the right side of the equal sign are called _________? | products. |
| The "Law of the Conservation of Mass" states ________? | Mass is neither created nor destroyed, it is only changing forms. |
| Shorthand: an arrow pointing from left to right signifies what? | yeilds, or produces |
| Shorthand: arrows, one above the other, point in opposite directions mean what? | the reaction can go either direction. |
| Shorthand: an arrow pointing up means what? | symbol for a gas |
| Shorthand: an arrow pointing down means what? | symbol for a precipitate or a solid |
| Shorthand: (g) means? | gas |
| Shorthand: (l) means? (lowercase L) | liquid |
| Shorthand: (s) means? | a solid or a precipitate. |
| Shorthand: (aq) means? | aqueous solution (usually means in water). |
| In a "double displacement" reaction, what happens? | The two cations switch partners (the two anions). Use the soluability table. There must be a solid or precipitate in the product. |
| In a "single displacement" reaction, what happens? | One cation or anion bumps another out. Check the Activity series to make sure the single ion is more active than the one it will displace. |
| Describe a "combustion reaction". | Burning a hydrocarbon in oxygen resulting in carbon dioxide and water being formed. |
| Describe a "decomposition reaction". | When you start with one reactant and get several products. |
| Describe a "combination reaction". | Where you start with several reactants and get one product. |
| Describe a "neutralization reaction". | An acid and a base combined produce a salt and water. |
| The solubility table is checked to see if what type of reaction will take place? | Double displacement reactions only. |
| When using the solubility table to see if a double displacement reaction will take place, what are you checking for? | to make sure one of the products is insoluable. |
| Will a double displacement reaction take place if you mix potassium acetate with silver nitrate? Don't cheat, look it up. | No, because both are H2O soluable so no solid is formed. |
| In an oxidation-reduction reaction, explain the 3 things oxidation is. | 1) a gain of oxygen 2) a loss of electrons 3) biologically, a loss of hydrogens. |
| In an oxidation-reduction reaction, explain the 3 things reduction is. | 1) a loss of oxygen 2) a gain of electrons 3) biologically, a gain of hydrogens. |
| Oxidation-reduction reactions always involve the gain and loss of ______? | electrons. The gain must always equal the loss. |
| In an oxidation-reduction reaction, which is the substance being reduced, the oxidizing agent or the reducing agent? | The oxidizing agent. |
| In an oxidation-reduction reaction, which is the substance being oxidized, the oxidizing agent or the reducing agent? | The reducing agent. |
| In an oxidation-reduction reaction, which is the substance gaining electrons, the oxidizing agent or the reducing agent? | The oxidizing agent. |
| In an oxidation-reduction reaction, which is the substance losing electrons, the oxidizing agent or the reducing agent? | The reducing agent. |
| What is the charge on diatomic elements, such as O2? | Zero (0) no charge. |
| What is the charge on uncombined elements or elements in their natural state? | Zero, no charge until they bond. |
| Oxidization is a _______ of electrons. | loss |
| Reduction is a ______ of electrons. | gain |
| What is Avogadro's number? | 6.02 x 10(23) "things" |
| In terms of Avogadro's number, how many atoms of Hydrogen are in one mole? | 6.02 x 10(23) "things" |
| What is a formula unit? (Slightly changed from the previous definition.) | The smallest whole # ratio of an ionic compound that retains all the properties of that compound. |
| In calculating molecular weights, would you use formula weight or molecular weight for ionic compounds? | formula weight (mass) |
| In calculating molecular weights, would you use formula weight or molecular weight for covalent compounds? | molecular weight (mass) |
| Aluminum has an atomic mass of 26.98 grams. How many atoms are in that 26.98 grams? | Avogadro's number, 6.02 x 10(23), naturally. |
| So what's stoichiometry? | the study of weight relationships in a chemical reaction. |
| How many stoichiometry practice problems do you need to do to be proficient at it? | Thousands, maybe more! |
| In the decomposition reactions in the study guide, NaHCO3, Ca(HCO3)2 and Ba(HCO3)2 all decompose to a metal-carbonate, H2O and CO2. Do all metal-bicarbonates do this? | email me the answer please. |
| Since NaOH + H2SO4 --> NaHSO4 + H2O, why does ZnOH + H2SO4 --> ZnSO4 + H2O instead of ZnHSO4 + H2O? | My theory is that Na at +1 balances with HSO4 at -1 whereas Zn at +2 balances with SO4 at -2. email me if I'm wrong please. |
