The number of protons in an atom of an element always equals its atomic weight.

a. True

b. False

An article suggests that substrate concentration (mg/cm3) of influent to a reactor is normally distributed with μ = 0.40 and σ = 0.09. (round your answers to four decimal places.) (a) what is the probability that the concentration exceeds 0.60?.

The energy released when Na + (g) and Cl - (g) form NaCl (s) is 778. kJ/mol. Approximately 162. J is absorbed from the surroundings when 2.35 g of NaCl is completely dissolved in water. What is the enthalpy of hydration of NaCl?

True or false: if half of a radioactive substance decays in the first 10 s, the other half will decay in the next 10 s.

In the reaction 2k (s) + 2h2oh (aq) + h2 (g) which of the reactants is a solid A) K B) H2O C) KOH D) H2

What's the empirical formula of a molecule containing 54.5% lithium, 9.2% carbon, and 36.6% oxygen?

What is an example of making a qualified observation

With respect to composition, how is the compound made from hydrogen and oxygen different from mixtures of these two elements?

How should scientist respond when new evidence that challenges current is presented?

Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H2. D2 (g) + H2 (g) ⇌ 2 HD (g) Kp = 1.80 P (D2) eq = 1.1 * 10-3 atm P (HD) eq = 2.7 * 10-3 atm

Find δe for the change in state of 1.0 molh2o (l) at 79 ∘c to h2o (g) at 116 ∘c. the heat capacity of h2o (l) = 75.3 j/molk, heat capacity of h2o (g) = 25.0 j/molk, and the heat of vaporization of h2o is 40.7*103j/mol at 100 ∘c.