Which change will decrease the number of effective collisions during a chemical reaction?

adding a catalyst

increasing the surface area

decreasing the temperature

increasing the reactant concentrations

increasing the volume of the reactants

What is the number of moles of gas contained in a 3 L vessel at 300 K with a pressure of 1.50 atm? (Given: R = 0.08205 L∙atm/mol∙K) 4.5 mol 0.18 mol 24.63 mol 5.47 mol 1.8 mol

If 10g of c4h10 were burned in the presence of 10. g grams of 02, how many grams of co2, are produced

When reaction 1) and 2) below are added together, the result is reaction 3).1) h2o (l) + hno2 (aq) ⇌ h3o + (aq) + no2 - (aq) k1 = 4.50 * 10-42) h3o + (aq) + oh - (aq) ⇌ 2 h2o (l) k2 = 1.

How much dioxin is present in 3.0 L of this water? Assume a density of 1.00 g/mL. Express the answer in grams using two significant figures.

How many valence electrons are in a silicon atom?

Describe your observations of the original solutions. Describe your observations when the silver nitrate was added to the sodium chloride solution.

A gas occupies 18.5L at stp. what volume will it occupy at 735 torr and 57°c?

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.

Which best identifies why the rusting of an iron nail in the presence of water and oxygen is in oxidation-reduction reaction

In the laboratory hydrogen gas is usually made by the following reaction:Zn (s) + 2HCl (aq) = H2 (g) + ZnCl2 (aq) How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mmHg and a temperture of 21 Co, can made from 3.