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chemestry regents FR
| Question | Answer |
|---|---|
| WHats the gram formula mas of an equation | its the mass of every single thing in a compound added together coeficiants make you multiply the whole this subscripts is just the element |
| how do you find the percent composition of a certain element in a compound | its the mass of just that compound over the gram formula mass times 100 |
| whats neutrons equal to | mass number - atomic number |
| whats an isotope | an atom with a difrent number of neutrons but same number of protons |
| Whats the relationship of electrons energy depending on which shell its on | the closer the shell is to the nucleus the less energy it has |
| What is the formula for atomic mass using isotopes? | (mass1×abundance1)+(mass2×abundance2) |
| When it asks to -State, in terms of the number of each type of atom, why the equation is balanced. - the answer is | The equation is balanced because both sides have the same number of each type of atom. |
| how do you know a reaction is endothermic or exothermic | if the heat is on the product side its exo if its on reactant its endo |
| whenever you see determine moles of some equation always use what | stoichiometry |
| Do zeros between nonzero digits count? | yes (they are significant). Example: 1002 → 4 sig figs |
| Do leading zeros count as sig figs? | No. Example: 0.0045 → 2 sig figs |
| Do trailing zeros count? | Depends: With decimal → YES Without decimal → NO |
| Multiplication/division rule for sig figs? | Round to the least number of sig figs in the problem. |
| Addition/subtraction rule for sig figs? | Round to the least number of decimal places. |
| what effect does twmp have on collisions | more collisions will occur at a higher temp as it increases the force of the collisions |
| Real gases act more ideal when: | high temperature → particles move faster (less attraction effect) low pressure → particles are farther apart |
| whats an isomer of a structure | when they have the same molecular formula difrent structular formula |
| whats the element in that allows a structure to be classified as an organic compound | carbon |
| the stronger the intermolecular forces the higher the | boiling point |
| whats the trend between first ionization energy and atomic number | First ionization energy decreases as atomic number increases. |
| whats q=MC▲T | the equation to find the amount of heat absorbed during a change of heat |
| when someone does an expirement and does like 4 difrent things but leaves one normal what is that one called | the control |
| in voltaic reactions what type of energy is created | chemical enegry turns into electrical energy |
| how does the cooling curve go from bottom to top | solid-freezing-liquid-condesation-gas |
| how does the heating curve go from bottom to top | solid-melting-liquid-boiling/vaporization-gas |
| how does averga kinetic energy have a relationship with temperature | as temp decreases so does the average kinetic energy |
| how to find heat realesed | mass times heat of fusion |
| when it asks why is blank saturated what do you have to do | always state their there is only single bonds and its a alkalane |
| when it asks (61 State, in terms of ions, why the HCl(aq) solution can conduct electricity. [1] ) | The HCl(aq) solution contains mobile ions. |
| when it asks why its a transmutation reaction what do you do | it changes from element one to element 2 |
| WHen it asks ( State how a bright-line spectrum from a sample of an element viewed through a spectroscope can be used to identify the element as gallium. ) | The spectral lines seen in the spectroscope are compared to the known bright-line spectrum of gallium. |
| when it asks why is this synthesis you say | 2 reactants form one product |
| when it asks a question like why is the bondiing in samples blank and blank ionic you say its because | an active metal reacted with a active nonmetal |
| when it asks why is an ion smaller or larger than the atom what do you do | check the amout of valence electrons it has and see if it gains or loses any shells |
| when it asks you to draw the orientation of something | its just the little black dots facing opisite of the na thing |
| when it asks which one has a higher boiling point water or the solution its always | solution as it was added into the water |
| whenever it says is the forward reaction equal to ther reverse reaction rate the answer is always | yes if it says equilibrium |
| Explain in terms of collisions why adding CO₂ increases CaCO₃. | Adding CO₂ increases the number of collisions between CO₂ and CaO particles, resulting in more successful collisions and producing more CaCO₃(s). |
Created by:
Fernando.Quezada