12. Which of the following is a combustion reaction?

A. CH4 + 202

+ CO2 + 2H2O

B. 2Fe + 3Cl2 → 2FeCl3

C. Ag + KNO3 → AgNO3 + K

D. 2H20 → 2H2 + O2

Particles of sand or dust rubbing across the surface of rocks is called: A. abrasion B. deflation C. calving D. plucking

What is the concentration of the base (naoh) in this titration? select one of the options below as your answer: a. 0.88 m b. 0.47 m c. 0.48 m d. 0.97 m

How does wataer cause weathering of a brick

Consider the reaction Mg (s) + I2 (s) → MgI2 (s) Identify the limiting reagent in each of the reaction mixtures below: a. 100 atoms of Mg and 100 molecules of I2 b. 150 atoms of Mg and 100 molecules of I2 c. 200 atoms of Mg and 300 molecules of I2 d.

5. A fire is started in a fireplace by striking a match and lighting crumpled paper under some logs. Explain all the energy transfers in this scenario using the terms exothermic, endothermic, system, surroundings, potential energy, and kinetic

Which particles in the atom are referred to as nucleons?

discuss the origin of the line citing the bohr theory of the atom specify any energy transitions that are applicable

What does the chemical formula of an ionic compound represent?

The wavelength of some yellow light is 580.0 nm. What is the frequency of this yellow light?

A sample of chlorine gas contracts from 550 mL to 376 mL when it is cooled from 63 °C to 12 °C. If the initial pressure of the chlorine was 725 torr, what is the final pressure of the chlorine?