Thermochemistry - / 1. Which combination is correct for a...

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Unformatted text preview: / 1. Which combination is correct for a chemical reaction that releases heat to the ~ sUlTounding s ? A . c . D. T yp e o f reac ti on A ll a t con s tant press u re E x othermic Pos it i v e E x othermic Negative Endothermic Posit i ve Endot h ermic Negativ e e ll J4 the r , ., : C--: i /J H- e i C . t 4 f f J '1 : t ~- b l + 2 . For which of t he following substance s is the standa r d en t hal p y of formation, t i li o/ m . l I l , eq u a l to ~ ero? <- It . / ur :/\ t a ) bromme [B r 2(g ) ] ~ ~1 [Cb (g) ] b ) zinc [ZI1 ( I) ] "e) go l d [Au (g ) ] c ) w a ter [ H 2 (1) ] . . y n endothermic r e act i on is one where: V Q heat is transferred from the s urrounding s into th e s y stem b) heat i s transferr e d from t h e system into the su r round in gs c ) the potent i al en erg y o f the s y s te m r emain s c o n s tant d ) there is n o tr a nsfe r of heat e ) b ot h a ) and c ) ttl- t ~ t 1 qb5( jr ifd 4 . A react i on absorbs heat . T h is means t h at : (9 the energy released when th e reacta n t bonds are broken i s less t h an the en e rgy abso r bed when the produc t bonds a r e f o rmed. b) the energ y released w h en the reactant bonds are broken is greater th a n the ener gy a bsorbed when the product bonds are formed . c ) the energy requ i red t o b reak t h e reactant bond s is le s s t han the energ y rel e a s ed w h e n the b o nds are for m ed . ~ e energy re q uired to b r e a k the r eactant bonds i s greater t han t he energ y relea s ed when the bon ~ are formed . 5. Refer to the r e a c tion below . H ow much h e a t is re l eased i f 95.0 g of sodium meta l re a cts? ( The molar ma s s of sodium is 23 . g / mo l . ) . \ c) 734 kJ ~ O kJ I ~ 3 1 kJ ~ :: " 1 (i\- l ) ~ ~55---- '\ ,\3 ~d\ S ~-- ( j r ~, ,~. "- "L 3 \ . \ 5 ) I ) ? <: 2 [ , ' " f '- '( J ~ a l nuclear changes a r e a c comp a nied b y enthalpy changes in the range o f: @ I O I O to l 12 kJ / m o l b ) 1 t o 1 2 kJ / mol c ) 1 2 t o 1 5 k J / m o l d ) 1 5 t o 1 8 kJ / m o l ~ A c co rding to t he en t h a l p y l e v el di agra m belo w, w h a t i s th e s ig n for M f a nd w ha t t erm...
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Thermochemistry - / 1. Which combination is correct for a...

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