Plz answer all with explanations.

1) Test tube 3, the third one.

2)

Explanation:

The first(1) test tube is Cold H2O(Water/dihydrogen monoxide), and 0.5 miligrams of Sodium Carbonate(Na2CO3).

The second(2) test tube is Cold H2O(Water/dihydrogen monoxide), and 0.5 miligrams of Sodium Carbonate(Na2CO3) with Citric acid(C6H8O7).

The third(3) test tube is Hot H2O(Water/dihydrogen monoxide), and 0.5 miligrams of Sodium Carbonate(Na2CO3).

The fourth(4) test tube is Hot H2O(Water/dihydrogen monoxide), and 0.5 miligrams of Sodium Carbonate(Na2CO3) with Citric acid(C6H8O7).

To find which test tube produces gas bubbles, evaluate the type of reaction from the given reactants by determining it's product. Reactants →(yeilds) Products.

Increasing temperature causes the concentration of a reactant to increase, while causing the concentration of a product to increase. This scenario is the exact opposite for decreasing temperature. Endothermic(heat transfer in;endo) is an increase in temperature, while Exothermic(heat transfer out;exo) is a decrease in temperature. Colder substances move slower, and will react slower while warmer substances move faster, and react faster. Just as you warm up when you run faster. This is all based on thermodynamics(heat energy and kinetic(motion) energy resulting in movement in particles). Temperature is the measure of average kinetic energy in an object. Surface tension decreases as temperature rises, and increases as temperature falls. Therefore more boubles with an endothermic reaction because heat is transferred within the substance. And thus a greater reaction.

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.

russia because it is the biggest state