Using equation e = (hcrh) (1n2) = (-2.18*10-18j) (1n2), calculate the energy of an electron in the hydrogen atom when n = 6.

While the membrane is depolarizing its Group of answer choices chloride gates are partially open. chloride gates are fully open. potassium gates are fully open. sodium gates are partially open. sodium gates are fully open.

When 25.0 ml of 0.500 m h2so4 is added to 25.0 ml of 1.00 m koh in a coffee-cup calorimeter at 23.50°c, the temperature rises to 30.17°c. calculate h of this reaction per mole of koh.

What is the empirical formula for a compound if a sample contains 3.72g of P and 21.28g of Cl? -PCl5 - PCl3 - P2Cl10 - P2Cl 5

Which of the following statements about moles is correct? A mole of Cu atoms has the same number of atoms as a mole of He atoms. A mole is 6.02 x 1024 There are more atoms in a mole of carbon than in a mole of helium. A mole is 6.2 x 1022

A nickel is about 2 millimeters thick, or 2/1,000 of a meter how many nanometers is this

An insulator: A. Conducts heat well B. Does not conduct heat well C. Is used to heat cold objects D. Is used to cool hot objects

Which of the following choices would have a negative entropy change? A. N2 (g) + 3H2 (g) - >2NH3 (g) B. CaCO3 (s) - > CaO (s) + CO2 (g) C. H2O (s) - > H2O (l) D. Fe2O3 (s) + 3C (s) - > 2Fe (s) + 300 (g)

Increasing the temperature of a liquid-solid solution will:

What is the most abundant substance dissolved in sea water? magnesium chloride sodium chloride

Problem 5.32 - enhanced - with feedback the rolling resistance for steel on steel is quite low; the coefficient of rolling friction is typically μr=0.002. suppose a 180,000 kg locomotive is rolling at 22 m/s on level rails.