Latest Questions & Answers

Q: Calculate the amount of energy required (in calories) to heat

Calculate the amount of energy required (in calories) to heat 145 g of water from 22.3 °C to 75.0 °C.

Q: Perform the indicated conversions. a. 85.21 cal

Perform the indicated conversions. a. 85.21 cal into joules b. 672.1 J into calories c. 8.921 kJ into joules d. 556.3 cal into kilojoules

Q: Which of the following statements is(are) true?

Which of the following statements is(are) true? a. Energy is changed in form in a process, but it is not produced or consumed. b. Heat is a flow of energy between two objects due to a temperature di...

Q: Which of the following is an endothermic process? a.

Which of the following is an endothermic process? a. combustion of gasoline in a car engine b. sublimation of carbon dioxide; CO2(s) CO2(g) c. water condensing on a cold pipe d. freezing...

Q: A chunk of ice at room temperature melts, even though the

A chunk of ice at room temperature melts, even though the process is endothermic. Why?

Q: What do we mean by entropy? Why does the entropy of

What do we mean by entropy? Why does the entropy of the universe increase during a spontaneous process?

Q: Does a double-displacement reaction such as NaCl(aq

Does a double-displacement reaction such as NaCl(aq) + AgNO3(aq) AgCl(s) + NaNO3(aq) result in a matter spread or in a concentration of matter?

Q: If a reaction occurs readily but has an endothermic heat of reaction

If a reaction occurs readily but has an endothermic heat of reaction, what must be the driving force for the reaction?

Q: Calculate the number of moles of sulfur atoms present in each of

Calculate the number of moles of sulfur atoms present in each of the following samples. a. 2.01 g of sodium sulfate b. 2.01 g of sodium sulfite c. 2.01 g of sodium sulfide d. 2.01 g of sodium thio...

Q: What does it mean to say that “energy spread” and

What does it mean to say that “energy spread” and “matter spread” are driving forces in chemical reactions?