Mindblown: a blog about philosophy.

Some ionic compounds contain a mixture of different charged cations. For example, some titanium oxides contain a mixture of Ti2 and Ti3 ions. Consider a certain oxide of titanium that is 28.31% oxygen by mass and contains a mixture of Ti2 and Ti3 ions. Determine the formula of the compound and the relative numbers of…

One of the emission spectral lines for Be3 has a wavelength of 253.4 nm for an electronic transition that begins in the state with n 5. What is the principal quantum number of the lower-energy state corresponding to this emission? (Hint: The Bohr model can be applied to one-electron ions. Don’t forget the Z factor:…

If the wavelength of the microwave in the oven is 9.75cm, how long does it take and how many photons must be absorbed, to make the water boil? The specific heat capacity is 4.18J*C-1g-1. Assume that only the water absorbs the energy of the microwave. Answer:- Solving for the amount of heat needed to boil the…

Cartels are difficult to maintain because Select one a. costs to the firms in a cartel are continually rising. b. each firm has an incentive to deviate from its agreed output level. c. the number of firms is always large. d. the monopoly output is very difficult to determine Answer:- b. Each individual firm has…

Consider an electron for a hydrogen atom in an excited state. The maximum wavelength of electromagnetic radiation that can completely remove (ionize) the electron from the H atom is 1460 nm. What is the initial excited state for the electron (n ?)?

Carbon absorbs energy at a wavelength of 150. nm. The total amount of energy emitted by a carbon sample is 1.98  105 J. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.

Consider the following waves representing electromagnetic radiation: Which wave has the longer wavelength? Calculate the wavelength. Which wave has the higher frequency and larger photon energy? Calculate these values. Which wave has the faster velocity? What type of electromagnetic radiation are illustrated?

Defend and criticize Bohr’s model. Why was it reasonable that such a model was proposed, and what evidence was there that it “works”? Why do we no longer “believe” in it?

The best solar panels currently available are about 13% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity per day (1 kWh 1 kilowatt hour; 1 kW 1000 J/s). Assuming 8.0 hours of useful sunlight per day, calculate the minimum solar panel surface area necessary to provide all…

Consider the substances in Table 6.1. Which substance requires the largest amount of energy to raise the temperature of 25.0 g of the substance from 15.0C to 37.0C? Calculate the energy. Which substance in Table 6.1 has the largest temperature change when 550. g of the substance absorbs 10.7 kJ of energy? Calculate the temperature…