What are the coefficients for the following reaction when it is properly balanced?___O2 + ___CH4 → ___CO2 + ___H2O

Divers often inflate heavy duty balloons attached to salvage items on the sea floor. If a balloon is filled to a volume of 3.00 L at a pressure of 2.50 atm, what is the volume of the balloon when it reaches the surface at 1 atmosphere?

The correct multiplier for the prefix pico is:

Which of the following elements has the electron configuration of 3s23p4 in its valence shell?

An iron ore sample is found to be 35.00% Fe by mass. How many grams of ore are needed to obtain 454.0 g of Fe?

Suppose it took 108 joules of energy to raise a bar of gold from 25.0°C to 29.7°C. Given that the specific heat capacity of gold is 0.128 J/g∙°C, what is the mass (in grams) of the bar of gold?

A 7.96 gram sample of silver reacts with oxygen to form 8.55 gram of the metal oxide. What is the empirical formula of this metal oxide?

A plastic block has dimensions of 2.2 cm × 3.0 cm × 1.5 cm and a mass of 12.4 grams. Will the block float in water and why?

A fictional element named nivadium is found to have three naturally occurring isotopes with the natural abundances shown here: MASS (amu) ABUNDANCE   22.1760   45.00%   23.1847   45.00%   24.1934   10.00% The calculated atomic mass of Nivadium is:

The common English unit in which the speed of an automobile is expressed is miles/hr. What is the set of base SI units for speed?