Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Chem 2 test
| Question | Answer |
|---|---|
| What is a mole? | 6.022 × 10²³ representative particles |
| What is Avogadro's number? | 6.022 × 10²³ particles/mol |
| What is molar mass? | The mass of one mole of a substance in grams (g/mol) |
| How do you calculate mass from moles? | Mass |
| How do you calculate moles from mass? | Moles |
| How do you calculate particles from moles? | Particles |
| How do you calculate moles from particles? | Moles |
| How do you calculate molar mass? | Add the atomic masses of all atoms in the chemical formula. |
| What is percent composition? | (Mass of element ÷ Molar mass of compound) × 100% |
| What is an empirical formula? | The simplest whole-number ratio of atoms in a compound. |
| What is a molecular formula? | The actual number of each type of atom in a molecule. |
| What is the representative particle of an element? | Atom |
| What is the representative particle of an ionic compound? | Formula unit |
| What is the representative particle of a molecular compound? | Molecule |
| How many grams are in one mole? | The molar mass of the substance in grams. |
| What is a chemical reaction? | A process where reactants are converted into products. |
| What are reactants? | Starting substances in a chemical reaction. |
| What are products? | Substances formed during a chemical reaction. |
| What are five signs of a chemical reaction? | Color change, gas production, precipitate formation, temperature change, light production. |
| What does the Law of Conservation of Mass state? | Matter cannot be created or destroyed. |
| Why must chemical equations be balanced? | To ensure the same number of each atom appears on both sides. |
| What is a coefficient? | A number placed in front of a chemical formula. |
| What is a subscript? | A number that indicates how many atoms of an element are present. |
| Can subscripts be changed when balancing equations? | No. |
| What is a synthesis reaction? | Two or more substances combine to form one product. |
| General form of a synthesis reaction | A + B → AB |
| What is a decomposition reaction? | One compound breaks into two or more simpler substances. |
| General form of a decomposition reaction | AB → A + B |
| What is a single replacement reaction? | One element replaces another element in a compound. |
| General form of a single replacement reaction | A + BC → AC + B |
| What is a double replacement reaction? | Two compounds exchange ions. |
| General form of a double replacement reaction | AB + CD → AD + CB |
| What is a combustion reaction? | A hydrocarbon reacts with oxygen to produce carbon dioxide and water. |
| What is a precipitate? | An insoluble solid formed during a reaction. |
| What are spectator ions? | Ions that do not participate in the reaction. |
| What is a total ionic equation? | An equation showing all soluble ionic compounds as ions. |
| What is a net ionic equation? | An equation showing only the ions involved in the reaction. |
| How do you write a net ionic equation? | Remove the spectator ions from the total ionic equation. |
| Which compounds are always soluble? | Compounds containing Group 1 ions or NH₄⁺. |
| Are nitrates soluble? | Yes, always. |
| Are acetates soluble? | Yes, always. |
| Are chlorides soluble? | Usually, except with Ag⁺, Pb²⁺, and Hg₂²⁺. |
| Are sulfates soluble? | Usually, except with Ba²⁺, Sr²⁺, Pb²⁺, and Ca²⁺. |
| Are carbonates soluble? | Usually insoluble except with Group 1 ions and NH₄⁺. |
| Are phosphates soluble? | Usually insoluble except with Group 1 ions and NH₄⁺. |
| Are hydroxides soluble? | Usually insoluble except Group 1 ions, NH₄⁺, and Ba²⁺. |
| What is stoichiometry? | The calculation of quantities in chemical reactions. |
| What is a mole ratio? | The ratio of coefficients in a balanced chemical equation. |
| What are the four steps of stoichiometry? | Balance the equation, convert to moles, use the mole ratio, convert to desired units. |
| How do you solve a mass-to-mass problem? | Grams → Moles → Mole Ratio → Moles → Grams |
| How do you solve a mass-to-volume problem? | Grams → Moles → Mole Ratio → Liters (if gas at STP) |
| How many liters does one mole of gas occupy at STP? | 22.4 L |
| What does STP stand for? | Standard Temperature and Pressure (0°C and 1 atm) |
| What is the limiting reactant? | The reactant that is used up first. |
| What is the excess reactant? | The reactant remaining after the reaction ends. |
| What is theoretical yield? | The maximum amount of product that can be formed. |
| What is actual yield? | The amount of product actually produced. |
| How do you calculate percent yield? | (Actual Yield ÷ Theoretical Yield) × 100% |
| What equation is used in calorimetry? | q = mcΔT |
| What does q represent? | Heat |
| What does m represent? | Mass |
| What does c represent? | Specific heat capacity |
| What does ΔT represent? | Final temperature − Initial temperature |
| What is the specific heat of water? | 4.184 J/g°C |
| What does the First Law of Thermodynamics state? | Energy cannot be created or destroyed. |
| If water gains heat, what happens to the object? | The object loses heat. |
| What is an endothermic reaction? | A reaction that absorbs heat. |
| What is an exothermic reaction? | A reaction that releases heat. |
| What is the relationship between heat gained and heat lost? | Heat gained |
| What is the formula for mass? | Mass |
| What is the formula for moles? | Moles |
| What is the formula for particles? | Particles |
| What is the formula for percent composition? | (Mass of element ÷ Molar mass of compound) × 100% |
| What is the formula for heat? | q = mcΔT |
| What is the formula for percent yield? | (Actual Yield ÷ Theoretical Yield) × 100% |
| How many liters does one mole of gas occupy at STP? | 22.4 L |
Created by:
Erista