Express in scientific notation. Choose the answer with the proper number of significant figures.

(3 x 10^4) (4 x 10^23) = ___

A. 12^27

B. 12 x 10^27

C. 10 x 10^27

D. 1 x 10^28

I thought it was B but that's incorrect

Which statement best describes resistance? Resistance is how well a current will flow in a material and is measured in volts. how well a material conducts an electrical charge and is measured in ohms.

How many molecules of liquid ethanol (CH3H2OH) are in 1.00 mL of ethanol, given its density is 0.789 g/mL?

What is mass for physical science

A 1.1 mole sample of Kr has a volume of 371mL. How many moles of Kr are in a 2.85L sample at the same temperature and pressure

Draw all the structural isomers for the molecular formula c4h9br. Be careful not to draw any structures by crossing one line over another; the system needs to know where you intend connections to be between atoms.

Which geologic time span covers the majority of Earth's history?

as the flames heat the gases in the balloon the volume of the gases increases at constant pressure the volume of all gases increases with increasing temperatures is this statement a scientific theory or law explain

At 1.0 atm, terell heats a sample of soild caffeine at 178c the soild converts directly into gas. what is the name of this phase change?

Practice Problem #1: __TiO2 + __Cl2 + __C __TiCl4 + __CO2 + __CO How many mol chlorine will react with 4.55 mol carbon? What mass titanium (IV) oxide will react with 4.

In which chemical reaction will the heat content of the reactants be more than that of the products?