Which formula represents a polar molecule?

(1) Br2 (3) CH4

(2) CO2 (4) NH3

Which of the following best describes acid anhydrides?

Classify each characteristics as either a metal or a non metal

Which statement is true about proper storage of flammable liquids? A. Store liquids in approval metal safety containers or original containers. B. Transfer liquids to plastic containers to enable more space on shelves. C.

A bubble of helium gas has a volume of 0.65 L near the bottom of a large aquarium where the pressure is 3.4 atm and the temperature is 19°C. Determine the bubble's volume upon rising near the top where the conditions change to 3.2 atm and 36°C.

What is the change in enthalpy for the combustion reaction of butane, C4H10? 2C4H10 (g) + 13O2 (g) → 10H2O (g) + 8CO2 (g) Given: C4H10 (g) : ΔHf ° = - 125 kJ H2O (g) : ΔHf ° = - 242 kJ CO2 (g) : ΔHf ° = - 393.5 kJ

When a catalyst lowers the activation energy of a reaction the rate of the reaction?

Liquids: A) must be contained to stay in one spot B) have a variable volume, but a fixed mass C) are usually more dense than solids and gases D) cannot be changed into gases

Given the following list from the activity series of metals (from most active to least active) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur? 1. Co²⁺ (aq) + Al (s) → Al³⁺ (aq) + Co (s) 2.

Chemical reactions that release energy A. will not occur. B. need catalysts to occur. C. will always explode. D. often occur spontaneously.

Which metal exist in liquid state and can be cut with knife?