What does the subscript in a chemical formula represent (the 2 in H2) ?

The rate constant for this first‑order reaction is 0.200 s - 1 at 400 ∘ C. A ⟶ products How long, in seconds, would it take for the concentration of A to decrease from 0.950 M to 0.300 M? t = s

A balloon is floating around outside. The temperature outside is - 19 Celsius, and the air pressure is 0.800 ATM. Your neighbor, who released the balloon, tell you that he filled it with 4.50 moles of gas.

To break a chemical bond, particles need to collide with a certain amount of ___? -energy -atoms -molecules -particles

In order for a plant to complete photosynthesis, all of the following need to be present except: Oxygen Sunlight Water Carbon Dioxide

How many grams of CaH2CaH2 are needed to generate 147 LL of H2H2 gas if the pressure of H2H2 is 823 torrtorr at 21 ∘C∘C? Express your answer using three significant figures.

How Fast Do Different Parts Of The EM Spectrum Travel In A Vacuum?

Why is haemoglobin a pure substance

The measurement of how fast an object moves over a certain amount of time. A:Velocity B:Speed C:Acceleration D:Displacement

At 25C, K = 0.090 for the reaction:H2O (g) + Cl2O (g) 2HOCl (g) Calculate the concentrations of all species at equilibrium for eachof the following cases: (a) 1.0g H2O and 2.0g Cl2O are mixed in a1.0-L flask. (b) 1.0 mol pure HOCl is placed in a 2.

Which of the following is the largest volume? 1.2 x 101 m3 1.2 x 108 cm3 2.0 x 104 dm3 1.2 x 108 mm3