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CHEM |! 103 |! UW |! Madison |! Exam |! 2 |!
with |! verified |! solutions
Which |! of |! the |! following |! processes |! are |! exothermic:
- |! Adding |! magnesium |! to |! a |! solution |! of |! HCl
- |! Water |! freezing |! on |! a |! cherry |! blossom
- |! The |! reaction |! of |! H2 |! and |! O2 |! gases |! to |! form |! water |! - |! Correct |! answer |! ✔All In |! the |! "collapsing |! can" |! experiment |! demonstrated |! in |! class |! (where |! a |! small |! amount |! of |! water |! was |! added |! to |! an |! empty |! soda |! can |! and |! brought |! to |! a |! boil |! for |! several |! minutes) |! which |! of |! the |! following |! statements |! is |! false? a) |! Before |! heating, |! the |! pressure |! of |! gas |! inside |! the |! open |! can |! was |! the |! same |! as |! the |! pressure |! outside |! of |! the |! open |! can. b) |! When |! the |! water |! was |! boiling |! in |! the |! can, |! the |! pressure |! of |! gas |! inside |! the |! open |! can |! was |! the |! same |! as |! the |! pressure |! outside |! of |! the |! open |! can. |! c) |! When |! placed |! in |! the |! cold |! water, |! the |! water |! vapor |! in |! the |! can |! condensed |! to |! liquid |! water. d) |! The |! vacuum |! created |! in |! the |! can |! pulled |! the |! walls |! of |! the |! can |! inwards. |! - |! Correct |! answer |! ✔The |! vacuum |! created |! in |! the |! can |! pulled |! the |! walls |! of |! the |! can |! inwards. Which |! of |! the |! following |! variables |! for |! a |! gas |! is/are |! inversely |! related |! to |! each |! other?
(i) |! Pressure |! and |! Volume (ii) |! Pressure |! and |! Temperature (iii) |! Pressure |! and |! Number |! of |! Moles |! - |! Correct |! answer |! ✔Pressure |! and |! Volume All |! flasks |! have |! the |! same |! conditions: |! volume |! is |! 2.50 |! L, |! pressure |! in |! each |! flask |! is |! 662 |! mmHg, |! and |! the |! temperature |! is |! 105 |! degrees |! C. |! Flask |! A |! has |! Cl2, |! flask |! B |! has |! Xe, |! flask |! C |! has |! H2. |! Which |! is |! true? (i) |! Each |! flask |! contains |! the |! same |! number |! of |! moles |! of |! gas. (ii) |! Each |! flask |! contains |! the |! same |! mass |! of |! gas. (iii) |! The |! rms |! speed |! for |! each |! gas |! is |! the |! same. |! - |! Correct |! answer |! ✔Each |! flask |! contains |! the |! same |! number |! of |! moles |! of |! gas The |! combustion |! of |! methane |! releases |! 891 |! kJ |! of |! heat. |! Describe |! the |! steps |! needed |! to |! determine |! how |! much |! heat |! is |! released |! by |! the |! combustion |! of |! 2.00 |! grams |! of |! CH4(g). CH4(g) |! + |! 2 |! O2(g) |! = |! CO2(g) |! + |! 2 |! H2O(g) |! - |! Correct |! answer |! ✔Step |! 1: |! convert |! to |! moles |! (2 |! g |! CH4 |! divided |! by |! molar |! mass |! of |! CH4) Step |! 2: |! multiply |! Step |! 1 |! value |! by |! 891 |! kJ/mol If |! you |! add |! 1000 |! mL |! of |! water |! to |! 100 |! mL |! of |! a |! 1.00 |! M |! solution |! of |! K2CrO4, |! describe |! how |! you |! would |! find |! the |! molarity |! (M) |! of |! the |! solution. |! - |! Correct |! answer |! ✔Step |! 1: |! add |! volumes |! together |! and |! convert |! to |! L Step |! 2: |! divided |! 1.00 |! by |! Step |! 1 |! value
Which |! of |! the |! following |! are |! false |! for |! an |! ideal |! gas? |! Select |! all |! that |! apply. a) |! The |! volume |! of |! the |! gas |! is |! negligible. b) |! All |! particles |! in |! a |! sample |! at |! 300 |! Kelvin |! are |! moving |! at |! identical |! speeds. c) |! The |! attraction |! between |! gas |! particles |! is |! negligible. d) |! The |! sample |! will |! be |! colorless. |! - |! Correct |! answer |! ✔All |! particles |! in |! a |! sample |! at |! 300 |! Kelvin |! are |! moving |! at |! identical |! speeds. The |! sample |! will |! be |! colorless. What |! is |! the |! total |! internal |! translational |! (kinetic) |! energy |! of |! the |! Cl2 |! molecules |! in |! a |! 11.2 |! liter |! bulb |! at |! 0 |! degrees |! C |! and |! 8 |! atm? |! Describe |! the |! steps |! you |! would |! take |! to |! solve. |! - |! Correct |! answer |! ✔Step |! 1: |! multiply |! pressure |! (8) |! by |! the |! volume |! (11.2) Step |! 2: |! divide |! the |! Step |! 1 |! value |! by |! R |! (0.08206) Step |! 3: |! divide |! the |! Step |! 2 |! value |! by |! T |! in |! K |! (273) Step |! 4: |! multiply |! Step |! 3 |! value |! by |! 3/ Which |! of |! the |! following |! is |! a |! characteristics |! of |! a |! greenhouse |! gas? a) |! Absorbs |! infrared |! (IR) |! light. b) |! Has |! a |! high |! density. c) |! Absorbs |! green |! light. d) |! Reacts |! readily |! with |! other |! gases. |! - |! Correct |! answer |! ✔Absorbs |! infrared |! light.
If |! a |! reaction |! is |! endothermic, |! the |! kinetic |! energy |! of |! the |! reaction |! would |! ___ |! (increase/decrease) |! and |! the |! chemical |! energy |! would |! ___ |! (increase/decrease). |! - |! Correct |! answer |! ✔decrease increase If |! a |! reaction |! is |! exothermic, |! the |! kinetic |! energy |! of |! the |! reaction |! would |! ___ |! (increase/decrease) |! and |! the |! chemical |! energy |! would |! ___ |! (increase/decrease). |! - |! Correct |! answer |! ✔increase decrease If |! the |! kinetic |! energy |! of |! a |! reaction |! increases |! and |! the |! chemical |! energy |! decreases, |! this |! is |! an |! ___ |! (exo-/endo-) |! thermic |! reaction. |! - |! Correct |! answer |! ✔exothermic If |! the |! kinetic |! energy |! of |! a |! reaction |! decreases |! and |! the |! chemical |! energy |! increases, |! this |! is |! an |! ___ |! (exo-/endo-) |! thermic |! reaction. |! - |! Correct |! answer |! ✔endothermic Two |! reagents |! react |! in |! a |! sealed, |! insulated |! calorimeter |! such |! that |! no |! heat |! can |! flow |! into |! or |! out |! of |! the |! calorimeter. |! During |! the |! process |! of |! reaction, |! the |! water |! inside |! the |! calorimeter |! gets |! colder. Consider |! the |! system |! to |! be |! the |! contents |! of |! the |! calorimeters |! (reagents |! and |! water), |! this |! process |! is:
b) |! endothermic c) |! q=0 |! - |! Correct |! answer |! ✔exothermic CaCl2 |! dissolves |! in |! water |! exothermically. |! Which |! of |! the |! following |! experiments |! produces |! the |! largest |! increase |! of |! thermal |! energy? |! Why? a) |! Dissolving |! 1.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. b) |! Dissolving |! 2.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. c) |! Dissolving |! 1.5 |! g |! CaCl2 |! in |! 50 |! mL |! of |! water. d) |! Dissolving |! 0.50 |! g |! CaCl2 |! in |! 150 |! mL |! of |! water. e) |! They |! would |! all |! produce |! the |! same |! quantity |! of |! thermal |! energy. |! - |! Correct |! answer |! ✔Dissolving |! 2.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. Since |! q |! = |! mcT, |! a |! larger |! m |! would |! result |! in |! a |! larger |! q. CaCl2 |! dissolves |! in |! water |! exothermically. |! Which |! of |! the |! following |! experiments |! produces |! the |! largest |! increase |! of |! thermal |! energy? |! Why? a) |! Dissolving |! 1.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. b) |! Dissolving |! 2.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. c) |! Dissolving |! 1.5 |! g |! CaCl2 |! in |! 50 |! mL |! of |! water. d) |! Dissolving |! 0.50 |! g |! CaCl2 |! in |! 150 |! mL |! of |! water. e) |! They |! would |! all |! produce |! the |! same |! quantity |! of |! thermal |! energy. |! - |! Correct |! answer |! ✔Dissolving |! 0.50 |! g |! CaCl2 |! in |! 150 |! mL |! of |! water. Since |! q |! = |! mcT, |! a |! smaller |! m |! would |! result |! in |! a |! smaller |! q.
CaCl2 |! dissolves |! in |! water |! exothermically. |! If |! the |! reaction |! takes |! place |! in |! a |! Styrofoam |! cup |! which |! of |! the |! following |! experiments |! would |! produce |! the |! largest |! temperature |! change? a) |! Dissolving |! 1.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. b) |! Dissolving |! 2.0 |! g |! CaCl2 |! in |! 100 |! mL |! of |! water. c) |! Dissolving |! 1.5 |! g |! CaCl2 |! in |! 50 |! mL |! of |! water. d) |! Dissolving |! 0.50 |! g |! CaCl2 |! in |! 150 |! mL |! of |! water. e) |! The |! temperature |! change |! would |! be |! the |! same |! in |! all |! cases. |! - |! Correct |! answer |! ✔Dissolving |! 1.5 |! g |! CaCl2 |! in |! 50 |! mL |! of |! water. For |! the |! following |! chemical |! reaction |! that |! takes |! place |! at |! constant |! pressure: 2Na(s) |! + |! 2H2O(l) |! = |! 2NaOH(aq) |! + |! H2(g) |! H |! = |! ‐365.7 |! kJ/mol Which |! of |! the |! following |! statements |! are |! true? (i) |! q |! = |! ‐365.7 |! kJ (ii) |! Work |! is |! done |! by |! the |! system |! on |! the |! surroundings. (iii) |! E |! = |! ‐365.7 |! kJ (iiii) |! Work |! is |! done |! by |! the |! surroundings |! on |! the |! system |! - |! Correct |! answer |! ✔q |! = |! ‐365.7 |! kJ Work |! is |! done |! by |! the |! system |! on |! the |! surroundings. Which |! of |! the |! following |! is |! not |! a |! state |! function?
iii. |! Decreasing |! the |! wavelength |! of |! the |! light |! striking |! the |! surface. |! - |! Correct |! answer |! ✔Decreasing |! the |! wavelength |! of |! the |! light |! striking |! the |! surface. 92 |! mL |! of |! sulfur |! dioxide |! gas |! is |! mixed |! in |! a |! sealed |! syringe |! (with |! a |! movable |! plunger) |! with |! 86 |! mL |! of |! oxygen |! gas |! to |! give |! a |! total |! of |! 178 |! mL |! of |! gas. What |! volume |! does |! the |! O2 |! gas |! occupy |! in |! the |! syringe |! once |! the |! two |! gases |! are |! mixed? |! - |! Correct |! answer |! ✔ 178 |! mL 92 |! mL |! of |! sulfur |! dioxide |! gas |! is |! mixed |! in |! a |! sealed |! syringe |! (with |! a |! movable |! plunger) |! with |! 86 |! mL |! of |! oxygen |! gas |! to |! give |! a |! total |! of |! 178 |! mL |! of |! gas. 2SO2 |! + |! O2 |! = |! 2SO Determine |! the |! final |! volume |! of |! gas |! in |! the |! syringe |! after |! the |! reaction. |! (Assume |! pressure |! and |! temperature |! remain |! constant). |! - |! Correct |! answer |! ✔Step |! 1: |! find |! how |! many |! mL |! of |! SO3 |! are |! produced |! from |! mL |! of |! SO Step |! 1a: |! multiply |! 92 |! mL |! by |! 2 |! moles |! of |! SO3 |! divided |! by |! 2 |! moles |! of |! SO Step |! 2: |! find |! how |! many |! mL |! of |! O2 |! reacted |! with |! mL |! of |! O Step |! 2a: |! multiply |! 92 |! mL |! by |! 1 |! mole |! of |! O2 |! divided |! by |! 2 |! moles |! of |! SO Step |! 3: |! subtract |! the |! Step |! 2a |! value |! from |! 86 |! mL Step |! 4: |! add |! 92 |! mL |! to |! Step |! 3 |! value |! to |! find |! final |! volume 2 |! moles |! of |! propane |! reacts |! with |! 8 |! moles |! of |! oxygen. |! Find |! the |! limiting |! reactant.
C3H8 |! + |! 5O2 |! = |! 3CO2 |! + |! 4H2O |! - |! Correct |! answer |! ✔Step |! 1: |! find |! LR Step |! 1a: |! divide |! 2 |! moles |! of |! propane |! by |! 1 |! mol Step |! 1b: |! divide |! 8 |! moles |! by |! 5 |! mol Step |! 2: |! determine |! the |! LR |! by |! finding |! which |! value |! from |! Step |! 1a/b |! is |! smaller 92 |! mL |! of |! sulfur |! dioxide |! gas |! is |! mixed |! in |! a |! sealed |! syringe |! (with |! a |! movable |! plunger) |! with |! 86 |! mL |! of |! oxygen |! gas |! to |! give |! a |! total |! of |! 178 |! mL |! of |! gas. 2SO2 |! + |! O2 |! = |! 2SO If |! immediately |! after |! the |! completion |! of |! the |! reaction |! of |! SO2 |! and |! O2 |! the |! volume |! of |! the |! gas |! in |! the |! syringe |! was |! lower |! than |! that |! calculated |! (132 |! mL), |! would |! this |! imply |! the |! reaction |! was |! exothermic |! or |! endothermic? |! Explain. |! - |! Correct |! answer |! ✔Since |! the |! volume |! decreased, |! the |! temperature |! must |! have |! decreased |! (when |! pressure |! and |! moles |! are |! constant), |! so |! the |! reaction |! must |! have |! been |! endothermic. 92 |! mL |! of |! sulfur |! dioxide |! gas |! is |! mixed |! in |! a |! sealed |! syringe |! (with |! a |! movable |! plunger) |! with |! 86 |! mL |! of |! oxygen |! gas |! to |! give |! a |! total |! of |! 178 |! mL |! of |! gas. 2SO2 |! + |! O2 |! = |! 2SO If |! immediately |! after |! the |! completion |! of |! the |! reaction |! of |! SO2 |! and |! O2 |! the |! volume |! of |! the |! gas |! in |! the |! syringe |! was |! higher |! than |! that |! calculated |! (132 |! mL), |! would |! this |! imply |! the |! reaction |! was |! exothermic |! or |! endothermic? |! Explain. |! - |!
Cu |! 0. Fe |! 0. Mg |! 1.017 |! - |! Correct |! answer |! ✔Mg If |! energy |! in |! the |! form |! of |! heat |! (q) |! and |! mass |! (m) |! are |! constant, |! the |! substance |! with |! the |! highest |! specific |! heat |! will |! have |! the |! smallest |! temp |! change A |! sample |! of |! water |! is |! in |! a |! closed |! container |! with |! variable |! volume. |! It |! is |! heated |! to |! its |! boiling |! point |! and |! allowed |! to |! boil. |! The |! sample |! is |! then |! allowed |! to |! condense |! back |! into |! liquid |! water, |! and |! then |! it |! is |! cooled |! back |! to |! its |! initial |! temperature. T/F; |! H |! for |! the |! entire |! process, |! start |! to |! finish, |! is |! 0. |! - |! Correct |! answer |! ✔True A |! sample |! of |! water |! is |! in |! a |! closed |! container |! with |! variable |! volume. |! It |! is |! heated |! to |! its |! boiling |! point |! and |! allowed |! to |! boil. |! The |! sample |! is |! then |! allowed |! to |! condense |! back |! into |! liquid |! water, |! and |! then |! it |! is |! cooled |! back |! to |! its |! initial |! temperature. T/F; |! H |! for |! the |! entire |! process, |! start |! to |! finish, |! is |! <0. |! - |! Correct |! answer |! ✔False A |! sample |! of |! water |! is |! in |! a |! closed |! container |! with |! variable |! volume. |! It |! is |! heated |! to |! its |! boiling |! point |! and |! allowed |! to |! boil. |! The |! sample |! is |! then |! allowed |! to |! condense |! back |! into |! liquid |! water, |! and |! then |! it |! is |! cooled |! back |! to |! its |! initial |! temperature.
T/F; |! When |! the |! entire |! process |! is |! considered, |! the |! change |! in |! energy |! equals |! the |! change |! in |! enthalpy. |! - |! Correct |! answer |! ✔True A |! sample |! of |! water |! is |! in |! a |! closed |! container |! with |! variable |! volume. |! It |! is |! heated |! to |! its |! boiling |! point |! and |! allowed |! to |! boil. |! The |! sample |! is |! then |! allowed |! to |! condense |! back |! into |! liquid |! water, |! and |! then |! it |! is |! cooled |! back |! to |! its |! initial |! temperature. T/F; |! When |! the |! entire |! process |! is |! considered, |! the |! change |! in |! energy |! is |! greater |! than |! the |! change |! in |! enthalpy. |! - |! Correct |! answer |! ✔False A |! sample |! of |! water |! is |! in |! a |! closed |! container |! with |! variable |! volume. |! It |! is |! heated |! to |! its |! boiling |! point |! and |! allowed |! to |! boil. |! The |! sample |! is |! then |! allowed |! to |! condense |! back |! into |! liquid |! water, |! and |! then |! it |! is |! cooled |! back |! to |! its |! initial |! temperature. T/F; |! No |! heat |! is |! exchanged |! with |! surroundings |! during |! the |! process. |! - |! Correct |! answer |! ✔False A |! sample |! of |! water |! is |! in |! a |! closed |! container |! with |! variable |! volume. |! It |! is |! heated |! to |! its |! boiling |! point |! and |! allowed |! to |! boil. |! The |! sample |! is |! then |! allowed |! to |! condense |! back |! into |! liquid |! water, |! and |! then |! it |! is |! cooled |! back |! to |! its |! initial |! temperature. T/F; |! Heat |! is |! exchanged |! with |! surroundings |! during |! the |! process. |! - |! Correct |! answer |! ✔True
The |! melting |! of |! ice |! on |! your |! hand |! makes |! your |! hands |! feel |! ___ |! (warm/cold). |! - |! Correct |! answer |! ✔cold Assume |! your |! hand |! and |! the |! reactants |! all |! start |! at |! the |! same |! temperature. |! As |! each |! process |! occurs, |! think |! about |! whether |! your |! hand |! feels |! warmer |! or |! cooler |! as |! the |! process |! (or |! processes) |! occur. The |! oxidation |! of |! glucose |! to |! form |! carbon |! dioxide |! and |! water |! in |! a |! test |! tube |! that |! you |! are |! holding |! makes |! your |! hands |! feel |! ___ |! (warm/cold). |! - |! Correct |! answer |! ✔warm Assume |! your |! hand |! and |! the |! reactants |! all |! start |! at |! the |! same |! temperature. |! As |! each |! process |! occurs, |! think |! about |! whether |! your |! hand |! feels |! warmer |! or |! cooler |! as |! the |! process |! (or |! processes) |! occur. Sweat |! evaporating |! from |! your |! hand |! makes |! your |! hands |! feel |! ___ |! (warm/cold). |!
- |! Correct |! answer |! ✔cold Describe |! how |! you |! would |! find |! the |! root-mean-square |! speed |! of |! H2S |! at |! 26 |! degrees |! C |! in |! m/s. |! - |! Correct |! answer |! ✔Step |! 1: |! Find |! equation |! (square |! root(3RT |! / |! M)) Step |! 2: |! Find |! molar |! mass |! of |! H2S Step |! 3: |! identify |! constant |! (R |! = |! 8.314) Step |! 4: |! Input |! values |! and |! calculate
If |! N2 |! gas |! at |! 3.0 |! atm |! in |! 1 |! L |! combines |! with |! Ar |! gas |! at |! 5.0 |! atm |! in |! 0.5 |! L, |! find |! the |! ratio |! of |! partial |! pressure |! of |! N2:Ar. |! - |! Correct |! answer |! ✔Step |! 1: |! multiply |! the |! pressure |! of |! N2 |! (3) |! by |! Vi |! of |! N2 |! (1) |! divided |! by |! Vf |! (1+0.5) Step |! 2: |! multiply |! the |! pressure |! of |! Ar |! (5) |! by |! Vi |! of |! Ar |! (0.5) |! divided |! by |! Vf |! (1.5) Step |! 3: |! divide |! Step |! 1 |! value |! by |! Step |! 2 |! value The |! molecular |! weight |! of |! a |! gas |! is |! 173.6 |! g/mol. |! Determine |! its |! density |! at |! 25. |! degrees |! C |! and |! 1.00 |! atm |! pressure |! in |! grams |! per |! liter. |! - |! Correct |! answer |! ✔Step |! 1: |! find |! equation |! (d |! = |! MP |! / |! RT) Step |! 2: |! find |! constant |! (R |! = |! 0.08206) Step |! 3: |! convert |! C |! to |! K Step |! 4: |! input |! values |! and |! calculate The |! value |! of |! ΔH° |! for |! the |! reaction |! below |! is |! -6535 |! kJ. |! Describe |! how |! you |! would |! determine |! the |! heat |! released |! (in |! kJ) |! for |! the |! combustion |! of |! 16.0 |! g |! of |! C6H6 |! (l). 2 |! C6H6(l) |! + |! 15 |! O2(g) |! → |! 12 |! CO2(g) |! + |! 6 |! H2O(l) |! - |! Correct |! answer |! ✔Step |! 1: |! find |! molar |! mass |! of |! C6H Step |! 2: |! convert |! grams |! of |! C6H6 |! (16) |! to |! moles |! of |! C6H Step |! 3: |! multiply |! Step |! 2 |! value |! by |! -6535 |! kJ |! and |! divide |! by |! number |! of |! moles |! in |! reaction |! (2)
If |! 21.0 |! grams |! of |! ice |! at |! 0◦ |! C |! and |! 21.0 |! grams |! of |! liquid |! water |! at |! 100◦ |! C |! are |! placed |! in |! an |! insulated |! container. |! What |! will |! be |! the |! temperature |! of |! the |! water |! after |! it |! reaches |! equilibrium? CH2O(g) |! 1.996 |! J/g |! c CH2O(l) |! 4.184 |! J/g |! c CH2O(s) |! 2.108 |! J/g |! c ∆Hfus |! 333 |! J/g ∆Hvap |! 2570 |! J/g |! - |! Correct |! answer |! ✔Step |! 1: |! set |! up |! equation |! (q |! of |! melting |! ice |! + |! q |! of |! warming |! water |! from |! 0 |! degrees |! C |! + |! q |! of |! cooling |! water |! from |! 100 |! degrees |! C) Step |! 2: |! input |! values |! and |! solve |! for |! x |! ((mHfus) |! + |! (mcx-0) |! + |! (mc*x-100) Melting |! of |! a |! substance |! requires |! using |! the |! ___ |! (∆Hfus/∆Hvap) |! value. |! - |! Correct |! answer |! ✔∆Hfus The |! diffusion |! rate |! of |! an |! unknown |! gas |! is |! measured |! to |! be |! 31.50 |! mL/min. |! Under |! identical |! conditions, |! the |! diffusion |! rate |! of |! oxygen |! gas |! is |! measured |! to |! be |! 30.50 |! mL/min. |! Hint: |! diffusion |! rate |! is |! directly |! related |! to |! velocity. |! Determine |! the |! identity |! of |! the |! unknown |! gas |! from |! the |! following |! options |! and |! explain |! why. a. |! CH b. |! CO c. |! NO d. |! CO
e. |! NO2 |! - |! Correct |! answer |! ✔NO since |! molar |! mass |! is |! 30.01 |! g/mol In |! terms |! of |! temperature |! T, |! what |! is |! the |! average |! kinetic |! energy |! of |! one |! mole |! of |! Xenon |! atoms? |! - |! Correct |! answer |! ✔3/2(RT) What |! is |! the |! enthalpy |! of |! formation |! of |! liquid |! bromine |! at |! 25 |! degrees |! C? |! - |! Correct |! answer |! ✔zero Does |! breaking |! bonds |! release |! or |! require |! energy? |! - |! Correct |! answer |! ✔release Does |! forming |! bonds |! release |! or |! require |! energy? |! - |! Correct |! answer |! ✔require Is |! breaking |! bonds |! endothermic |! or |! exothermic? |! - |! Correct |! answer |! ✔endothermic Is |! forming |! bonds |! endothermic |! or |! exothermic? |! - |! Correct |! answer |! ✔exothermic This |! effect |! occurs |! when |! infrared |! radiation |! that |! is |! emitted |! from |! the |! earth's |! surface |! is |! trapped |! by |! gases |! (H2O, |! CO2, |! CH4, |! etc) |! that |! also |! absorb |! and |! re- emit |! this |! infrared |! radiation. |! - |! Correct |! answer |! ✔green |! house |! effect
