Consider the following intermediate chemical equations.

What is the enthalpy of the overall chemical reaction

-205.7 kJ

-113.4 kJ

-14.3 kJ

78.0 kJ

Most people like to go outside on a sunny day, but too much sun exposure can cause sunburns as well as long term health problems, such as eye damage or skin cancer. How do humans protect themselves from too much sun exposure?

Given a gas inside a 2.93 L container at a temperature of 20 Celsius. The temp increases to 40 Celsius. what happens to the volume of gas and whose gas law is this?

When methane reacts with oxygen, the products are carbon dioxide (CO2) and water (H2O). How many grams of water are formed if 24g of methane react completely with 96g of oxygen to form 66g of carbon dioxide? (include units)

During the action of a sodium-potassium pump, 50 ATP molecules were spent. Predict how many sodium ions are transported across the cell membrane.

Surface roughness can be measured as either an arithmetic average (aa) or a root-mean-square (rms) average. which value is almost always greater for most surfaces:

Two body systems that are affected by asthma attack

What type of reaction is BaCl2 + Na2SO4 → 2NaCl + BaSO4?

Which type of chemical reaction occurs in Ca + Cl2 - >CaCl2? synthesis combustion single replacement double replacement

What should I do for science fair this year?

A buffer solution has 0.625 M HCN and 0.575 M CN-. If 0.030 moles of NaOH is added to 400. mL of the buffer solution, what is the pH after the addition? The pKa of hydrocyanic acid is 9.31.