Which change shows a tenfold increase in the concentration of H + ions? Which change shows a tenfold increase in the concentration of H + ions?

a) pH 1 → pH 2

b) pH 10 → pH 1

c) pH 1 → pH 10

d) pH 2 → pH 1

The rate constant for this second‑order reaction is 0.550 M-1⋅s-1 at 300∘C. A ⟶ productsHow long, in seconds, would it take for the concentration of A to decrease from 0.800 M to 0.380 M?

An atom whose valence electrons conform to the octet rule is: A. More likely to form covalent bonds b. Form ionic bonds c. Form hydrogen bonds d. Less likely to form any bond

The enthalpy of formation of liquid ethanol (c2h5oh) is - 277.6 kj/mol. what is the equation that represents the formation of liquid ethanol?

The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. When air is passed through red-hot carbon, the following reaction occurs: 2C + O2 (g) 2CO (g).

An ecologist counts 75 cardinals in an area measuring 15 square kilometers. What is the population density of the cardinals?

Which of the following likely formed Mars' moons?

Which process involves mass movement within a substance? a. conduction b. convection c. radiation d. reflection

A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing?

Which describes an object's speed in free fall? a. The object accelerates until it reaches its terminal velocity. b. The object falls at a constant speed because only one force acts on it. c.

Which metal can be cutted easiy?