Physics, 09.07.2019 15:00, thulani2

During an exothermic process, during an exothermic process, no heat is exchanged between the system and the surroundings the system feels cold to the touch heat flows from the system to the surroundings heat flows from the surroundings to the system

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Chemistry, 06.07.2019 01:20, blackwelle72

Which statements are true? δ for an exothermic reaction is positive. δ for an endothermic reaction is positive. the evaporation of water is an exothermic process. a combustion reaction is exothermic. when energy is transferred as heat from the surroundings to the system, δ is negative. when energy is transferred as heat from the system to the surroundings, δ is negative.

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Chemistry, 23.07.2019 12:00, chevi2005

1. energy changes occur as * a.heat transfer b.work c.power d.a combination of heat transfer and work 2.when heat energy is absorbed from surroundings * a.it is an exothermic process b.it is an endothermic process c.a chemical change must occur d.it feels warm to the touch 3.how does heat energy spontaneously move? * a.heat does not move unless work is done b.heat moves from an object of lower temperature to an object of c.higher temperature d.heat moves from an object of higher temperature to an object of lower temperature e.heat moves in the direction of the gravitational force 4. 1 calorie is equal to (mark all that apply) * a.1,000 kilocalories b.1 kilocalorie c.1,000 calories 5.heat capacity depends on * a.pressure b.mass c.density d.joules 6. 1 calorie is equal to * a.4.184 j b.1,000 j c.6.02x10²³ j d.8.314 j 7. condensation is * a.a chemical exothermic process b.a physical exothermic process c.a chemical endothermic process 8. look at the graph below. what kind of reaction is being represented? a.endothermic reaction b.exothermic reaction c.neutralization reaction d.single replacement reaction 9. when 435 j of heat is added to 3.4 g of olive oil at 21°c, the temperature increases to 85°c. what is the specific heat of olive oil? show your work for credit. * a.94,656 j/g°c b.2.0 j/g°c c.23 j/g°c d.1.5 j/g°c 10. a positive δ h value indicates that the reaction is * a.endothermic b.exothermic c.neutral d.synthesis 11. what are the four variables that affect the rate of a reaction? * 12. what is the measurement of the heat flow into or out of a system for chemical and physical processes called? * 13. describe how the ocean affects the temperature of coastal areas in the summer and winter. *

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Chemistry, 23.07.2019 14:00, alicat20

Anyone know any of these? pls , need to correct asap energy changes occur as * a.heat transfer b.work c.power d.a combination of heat transfer and work when heat energy is absorbed from surroundings * a.it is an exothermic process b.it is an endothermic process c.a chemical change must occur d.it feels warm to the touch 1 calorie is equal to (mark all that apply) * a.2 points b.1,000 kilocalories c.1 kilocalorie d.1,000 calories heat capacity depends on * a.pressure b.mass c.density d.joules 1 calorie is equal to * a.4.184 j b.1,000 j c.6.02x10²³ j d.8.314 j condensation is * a.a chemical exothermic process b.a physical exothermic process c.a chemical endothermic process d.a physical endothermic process what kind of thermochemical equation is represented below? * a.endothermic b.exothermic c.neutralization d.single replacement reaction when 435 j of heat is added to 3.4 g of olive oil at 21°c, the temperature increases to 85°c. what is the specific heat of olive oil? show your work for credit. * a.94,656 j/g°c b.2.0 j/g°c c.23 j/g°c d.1.5 j/g°c a positive δ h value indicates that the reaction is * a.endothermic b.exothermic c.neutral d.synthesis

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Chemistry, 31.10.2019 07:31, psa180

Calculate e and determine whether the process is endothermic or exothermic for the following cases: (a) q = 0.763 kj and w = -840 j. (b) a system releases 66.1 kj of heat to its surroundings while the surroundings do 44.0 kj of work on the system.

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