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The ΔE of a system that absorbs 12.4 J of heat and does 4.2 J of work on the surroundings is ________ SHOW WORK FOR THIS QUESTION

Of the following transitions in the Bohr hydrogen atom, the ________ transition results in the emission of the lowest-energy photon.

Which solution has the same number of moles of HCl as 25.0 mL of 0.200 M solution of HCl? YOU MUST SHOW WORK FOR THIS QUESTION

The value of ΔH° for the reaction below is -186 kJ.                          H2 (g) + Cl2 (g) → 2HCl (g)  The value of ΔH°f for HCl (g) is ________ kJ/mol.

BONUS QUESTION OPTIONAL:  Calculate the energy (J) found in one photon of visible light if the wavelength is 589 nm. YOU MUST SHOW YOUR WORK FOR THIS QUESTION TO GET THE BONUS POINTS

Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than iron. Which of the following correctly lists the elements in order of increasing activity?

BONUS QUESTION OPTIONAL: Balance the following equation in a BASIC solution. You MUST show all your work. You can just type your answer below and upload your work to support your answer.  Te + NO3 – → TeO3 2- + N2O4  

How many milliliters of a 14.2 M HCl solution is needed to prepare a 0.715 L solution of HCl with a concentration of 0.350 M? YOU MUST SUBMIT YOUR WORK FOR THIS QUESTION

A cluster of characteristics that are associated with all members of a specific social group is a: 

What are the stages of prenatal development in order?