Which of the following chemical equations represents an oxidation-reduction reaction?

A. Mg (OH) 2 + 2HCl →MgCl2 + 2H2O

B. BiCl2 + Na2SO4 →2NaCl + BiSO4

C. CH4 + 2O2→CO2 + 2H2O

D. 3NaOH + H3PO4→Na3PO4 + 3H2O

What volume of ethanol (density = 0.7893 g/cm3) should be added to 450. ml of water in order to have a solution that freezes at â15.0°c? (for water, kf = 1.86 °c/m.) ?

Which phrase best defines nuclear fission? A. splitting the nucleus of the atom B. combining two nuclei C. combining two atoms chemically D. stripping the electrons from an atom

Describe in words the reaction represented by the equation and include a description of the composition of each kind of molecule 2h2+02=2h20

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2

Which determines the frequency of a sound wave? A the intensity of the sound waves B the rate at which the sound source is vibrating C the pitch of the sound waves D the wavelength of the sound waves

1.4 Explain why it is important to support individuals to challenge information about services that may present a barrier to participation

Which describes energy changes during nuclear fission? A very large amount of energy is produced from a tremendous mass. EEUU A very large amount of energy is produced from a very small mass. G .

A 0.75mol calcium carbonate (CaCO3) pellet has what mass?

The pH of the acid in the stomach is 2. When a person has heartburn, the acid in their stomach is coming up the esophagus (lower throat) and burning the lining of the esophagus. Why would a person take an Alka Seltzer tablet for heartburn?

Calculate the photon energy (in joules) for the light emitted from the hydrogen atom if ninitial = 4 and nfinal = 2.