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by BlastRoom
Classify heat flow and connect it to the sign of ΔH.
#chemistry
40 questions
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A hand warmer becomes hot after iron powder reacts with oxygen inside the packet. What classification fits the reaction?
When HCl(aq) and NaOH(aq) are mixed in a foam cup, the solution temperature rises from 21 °C to 34 °C. What happened?
A mixture of baking soda and citric acid in a sealed bag feels cold while it reacts. For the reacting chemicals, which label is correct?
Calcium chloride dissolves in water and the cup becomes warm. What is the best classification for dissolving CaCl2?
Photosynthesis stores energy from sunlight while forming glucose from CO2 and H2O. How is the overall process classified?
A propane grill heats the air and food as C3H8 burns. What classification applies to the combustion reaction?
A beaker gets very cold during the reaction of barium hydroxide with ammonium thiocyanate. What does that observation show about the reaction?
Cellular respiration of glucose releases usable energy and heat. How should the overall reaction be classified?
A thermometer in a reacting mixture drops from 25 °C to 17 °C while the reaction continues. For the reaction system, what classification fits?
A reaction has ΔH = -82 kJ. What does the negative sign show?
For dissolving KNO3 in water, ΔH = +34.9 kJ/mol. What does the plus sign mean?
A thermochemical equation gives ΔH = -394 kJ for forming 1 mol of CO2. Which heat-flow statement is correct?
Calorimetry gives ΔHrxn = +18 kJ. Which interpretation fits this result?
Glucose combustion is listed with ΔH = -2803 kJ per mole of glucose. Which classification matches this sign?
A reaction step has ΔH > 0. Which statement must be true for that step?
If ΔH is negative for A → B, which statement about the reaction is correct?
A chemical process is measured with ΔH = +6.0 kJ. What classification and heat flow match the sign?
Methane combustion releases heat. Which equation places heat on the correct side?
Decomposing calcium carbonate requires heating: CaCO3 forms CaO and CO2. Which placement is correct?
Liquid water freezes and releases heat. Which thermochemical equation shows the heat placement correctly?
An ice cube melts by absorbing energy from its surroundings. Which equation places heat correctly?
A neutralization warms the solution: HCl(aq) + NaOH(aq) forms NaCl(aq) and H2O(l). Which equation fits?
For N2(g) + O2(g) → 2NO(g), ΔH = +180.5 kJ. How should heat be shown?
Electrolysis of water requires energy to form hydrogen and oxygen gases. Which equation best represents the energy placement?
Water vapor forms frost directly on a freezer wall and gives off heat. Which equation places heat correctly?
In a reaction, the products have more stored chemical energy than the reactants. What is true about the overall energy change?
The products of a reaction have lower enthalpy than the reactants. Which conclusion follows?
An energy diagram lists reactants at 80 kJ and products at 140 kJ. What is ΔH for the reaction?
Reactants are at 200 kJ on an energy diagram, and products are at 75 kJ. Which result is correct?
After bonds rearrange, the products are 30 kJ higher in enthalpy than the starting substances. What must have happened?
On an energy profile, the product level is 25 kJ below the reactant level. Which statement matches the profile?
A reaction in an insulated cup of water leaves its products higher in enthalpy than the reactants. What happens to the temperature of the water?
Which energy comparison matches an exothermic reaction?
Water evaporates from skin and the skin feels cooler. For the water, how is evaporation classified?
Steam condenses into liquid droplets on a cool lid. For the water vapor system, what happens to heat?
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Liquid wax solidifies as a candle cools. For the wax, which energy direction is correct?
Frost forms when water vapor changes directly to ice on a cold window. How is the phase change classified for the water?
Ice cream left on a warm counter melts. For the ice cream, what is the heat-flow direction?
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24 questions
