Is this reaction endothermic or exothermic

d) NH4NO3 (s)  NH4 + (aq) + NO3 - (aq) [Note, this is the reaction that takes place in a cold pack]

How can you use your knowledge of minerals chemical makeup or use a: to identify minerals b: to determine the color of the minerals c: to classify minerals d: to determine how to break down minerals

Na2CO3 + CO2 + H2O → NaHCO3 1. Which of the following coefficients would correctly balance the chemical reaction shown above? A. 1,2,3,4 B. 1,1,1,2 C. 2,1,1,1 D. 2,2,3,1

The US National Debt Clock showed the outstanding public debt to be $16,213,166,914,811 on October 28, 2012. How many stacks like the one described would be necessary to pay off this debt?

Which best defines nitrogen fixation? A.) the process of creating free nitrogen for plants to absorb B.) the breakdown of nitrogen in the soil C.) the conversion of nitrogen gas into a usable form D.

Consider the following reaction at 25 °C: 4Fe (s) + 3O2 (g) ⇌ 2Fe2O3 (s) An equilibrium mixture contains 1.0 mol Fe, 1.0 * 10-3 mol O2, and 2.0 mol of Fe2O3 all in a 2.0 L container. Calculate the value of K for this reaction.

A scientist in London and a scientist in California both conducted independent investigations that produced similar results.

When magnesium combines with oxygen, the reaction involves a. a conversion of protons into electrons. b. sharing of electrons between Mg and O. c. transfer of electrons from Mg to O. d. transfer of electrons from O to Mg.

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.

What process transform solar energy into chemical energy?

When the reaction was carried out the calculated theoretical yield for water was 176 grams but the measured yield was 148 grams what is the percent yield