Which of the following processess has a negative ΔH (exothermic)?

Which of the following is the correct formation reaction for glucose (C6H12O6 )?

A system has a change in its internal energy of ΔE = +51 kJ when it does 94 kJ of work on its surroundings. Which of the following statements is true?

A sample of copper aborbs 75.0 J of heat as its temperature increases from 10.0°C to 27.0°C. What is the mass (in g) of this sample of copper? Hint:  specific heat of copper  

Given the following data:                      2 C (s)  +  O2 (g)  →  2 CO (g)                 ΔH =   −221.0 kJ      2 C (s)  +  O2 (g)  +  4 H2 (g)   →   2 CH3OH (g)     ΔH =  −402.4 kJ     Calculate ΔHrxn  for the reaction:      CO (g)    +  2 H2 (g)   →    CH3OH (g)

A sample of beryllium aborbs 325 J of heat as its temperature increases from 10.0°C to 27.0°C. What is the mass (in g) of this sample of beryllium? Hint:  specific heat of beryllium  

How many moles of lithium ions are present in 2000 mL of 1.53 M solution of Li2SO4?

A  260/280 ratio should be 1.6 and 2. What is happening when the ratio is less than 1.6?

What is the main purpose of phenol in the phenol/chloroform nucleic acid extraction method? 

The convention at Seneca Falls’ Declaration of Sentiments and Resolutions was controversial because it called for