Distinguish Exothermic and Endothermic Reactions - Chemistry
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Identify exothermic or endothermic if heat is written as a product in the equation.
Identify exothermic or endothermic if heat is written as a product in the equation.
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Exothermic. Heat as product indicates release.
Exothermic. Heat as product indicates release.
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Choose the correct type: a hand warmer packet produces heat when activated.
Choose the correct type: a hand warmer packet produces heat when activated.
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Exothermic. Heat production is exothermic.
Exothermic. Heat production is exothermic.
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Choose the correct type: an instant cold pack absorbs heat when chemicals mix.
Choose the correct type: an instant cold pack absorbs heat when chemicals mix.
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Endothermic. Heat absorption cools the surroundings.
Endothermic. Heat absorption cools the surroundings.
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Identify exothermic or endothermic: photosynthesis requires energy input from sunlight.
Identify exothermic or endothermic: photosynthesis requires energy input from sunlight.
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Endothermic. Light energy input drives the reaction.
Endothermic. Light energy input drives the reaction.
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Identify exothermic or endothermic: cellular respiration releases energy from glucose oxidation.
Identify exothermic or endothermic: cellular respiration releases energy from glucose oxidation.
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Exothermic. Glucose oxidation releases stored energy.
Exothermic. Glucose oxidation releases stored energy.
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What is the correct placement of heat in a thermochemical equation for an exothermic reaction?
What is the correct placement of heat in a thermochemical equation for an exothermic reaction?
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Heat is written on the product side. Heat appears as a product when released.
Heat is written on the product side. Heat appears as a product when released.
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Which option describes the reaction mixture temperature in an endothermic process: increases or decreases?
Which option describes the reaction mixture temperature in an endothermic process: increases or decreases?
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Decreases. Energy absorption cools the reaction mixture.
Decreases. Energy absorption cools the reaction mixture.
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What is the correct placement of heat in a thermochemical equation for an endothermic reaction?
What is the correct placement of heat in a thermochemical equation for an endothermic reaction?
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Heat is written on the reactant side. Heat appears as a reactant when absorbed.
Heat is written on the reactant side. Heat appears as a reactant when absorbed.
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Which option describes the reaction mixture temperature in an endothermic process: increases or decreases?
Which option describes the reaction mixture temperature in an endothermic process: increases or decreases?
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Decreases. Energy absorption cools the reaction mixture.
Decreases. Energy absorption cools the reaction mixture.
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Identify exothermic or endothermic if heat is written as a product in the equation.
Identify exothermic or endothermic if heat is written as a product in the equation.
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Exothermic. Heat as product indicates release.
Exothermic. Heat as product indicates release.
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Identify exothermic or endothermic if $\Delta H = -125\ \text{kJ}$ for a reaction.
Identify exothermic or endothermic if $\Delta H = -125\ \text{kJ}$ for a reaction.
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Exothermic. Negative $\Delta H$ means exothermic.
Exothermic. Negative $\Delta H$ means exothermic.
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Identify whether this process is exothermic or endothermic: freezing water releases heat to surroundings.
Identify whether this process is exothermic or endothermic: freezing water releases heat to surroundings.
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Exothermic. Phase change releases energy.
Exothermic. Phase change releases energy.
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Which option is correct if products have higher enthalpy than reactants: exothermic or endothermic?
Which option is correct if products have higher enthalpy than reactants: exothermic or endothermic?
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Endothermic. Higher enthalpy means energy was absorbed.
Endothermic. Higher enthalpy means energy was absorbed.
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Identify exothermic or endothermic if heat is written as a reactant in the equation.
Identify exothermic or endothermic if heat is written as a reactant in the equation.
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Endothermic. Heat as reactant indicates absorption.
Endothermic. Heat as reactant indicates absorption.
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Which option is correct for exothermic: $H_{\text{products}} - H_{\text{reactants}}$ is positive or negative?
Which option is correct for exothermic: $H_{\text{products}} - H_{\text{reactants}}$ is positive or negative?
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Negative. Products have less enthalpy than reactants.
Negative. Products have less enthalpy than reactants.
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Which option is correct for endothermic: $H_{\text{products}} - H_{\text{reactants}}$ is positive or negative?
Which option is correct for endothermic: $H_{\text{products}} - H_{\text{reactants}}$ is positive or negative?
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Positive. Products have more enthalpy than reactants.
Positive. Products have more enthalpy than reactants.
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Identify whether $q_{\text{system}}$ is $> 0$ or $< 0$ for an endothermic reaction.
Identify whether $q_{\text{system}}$ is $> 0$ or $< 0$ for an endothermic reaction.
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$q_{\text{system}} > 0$. System gains heat in endothermic reactions.
$q_{\text{system}} > 0$. System gains heat in endothermic reactions.
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Choose exothermic or endothermic: a reaction emits light and heat to the surroundings.
Choose exothermic or endothermic: a reaction emits light and heat to the surroundings.
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Exothermic. Light and heat emission indicates energy release.
Exothermic. Light and heat emission indicates energy release.
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Choose exothermic or endothermic: a reaction proceeds only while heat is continuously supplied.
Choose exothermic or endothermic: a reaction proceeds only while heat is continuously supplied.
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Endothermic. Continuous heating requirement indicates absorption.
Endothermic. Continuous heating requirement indicates absorption.
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Identify the type: thermal decomposition requires heating to break a compound into simpler substances.
Identify the type: thermal decomposition requires heating to break a compound into simpler substances.
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Endothermic. Breaking bonds requires energy input.
Endothermic. Breaking bonds requires energy input.
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Which option describes the surroundings during an endothermic reaction: warmer or cooler?
Which option describes the surroundings during an endothermic reaction: warmer or cooler?
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Cooler. Absorbed energy cools the surroundings.
Cooler. Absorbed energy cools the surroundings.
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Which option describes the surroundings during an exothermic reaction: warmer or cooler?
Which option describes the surroundings during an exothermic reaction: warmer or cooler?
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Warmer. Released energy heats the surroundings.
Warmer. Released energy heats the surroundings.
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Which sign of $\Delta H$ indicates an endothermic reaction: positive or negative?
Which sign of $\Delta H$ indicates an endothermic reaction: positive or negative?
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$\Delta H > 0$ (positive). Positive indicates energy absorbed by system.
$\Delta H > 0$ (positive). Positive indicates energy absorbed by system.
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Which sign of $\Delta H$ indicates an exothermic reaction: positive or negative?
Which sign of $\Delta H$ indicates an exothermic reaction: positive or negative?
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$\Delta H < 0$ (negative). Negative indicates energy released from system.
$\Delta H < 0$ (negative). Negative indicates energy released from system.
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What is the definition of an endothermic reaction in terms of energy transfer?
What is the definition of an endothermic reaction in terms of energy transfer?
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A reaction that absorbs energy (usually heat) from the surroundings. Energy absorption cools the surroundings.
A reaction that absorbs energy (usually heat) from the surroundings. Energy absorption cools the surroundings.
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What is the definition of an exothermic reaction in terms of energy transfer?
What is the definition of an exothermic reaction in terms of energy transfer?
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A reaction that releases energy (usually heat) to the surroundings. Energy release makes the surroundings warmer.
A reaction that releases energy (usually heat) to the surroundings. Energy release makes the surroundings warmer.
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Identify exothermic or endothermic: the surroundings gain heat during the process.
Identify exothermic or endothermic: the surroundings gain heat during the process.
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Exothermic. System releases heat to surroundings.
Exothermic. System releases heat to surroundings.
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Identify exothermic or endothermic: the surroundings lose heat during the process.
Identify exothermic or endothermic: the surroundings lose heat during the process.
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Endothermic. Surroundings lose heat to the system.
Endothermic. Surroundings lose heat to the system.
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Choose exothermic or endothermic: dissolving $\text{CaCl}_2$ in water warms the solution.
Choose exothermic or endothermic: dissolving $\text{CaCl}_2$ in water warms the solution.
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Exothermic. Warming effect indicates heat release.
Exothermic. Warming effect indicates heat release.
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Choose exothermic or endothermic: dissolving $\text{NH}_4\text{NO}_3$ in water cools the solution.
Choose exothermic or endothermic: dissolving $\text{NH}_4\text{NO}_3$ in water cools the solution.
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Endothermic. Cooling effect indicates heat absorption.
Endothermic. Cooling effect indicates heat absorption.
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