Two different isotopes of the same element have : (true/false)

- Equal nuclear charges

- Similar radioactive decay properties

- Equal mass of an atom

- Different number of neutrons

- Equal mass of a nucleus

Which does not describe the relationship between the nucleus and the electron cloud of an atom? a. The electron cloud takes up much more space than the nucleus. b. he masses of the nucleus and electron cloud are balanced. c.

How many moles of a gas sample are in a 10.0 L container at 298 K and 203 kPa? (Use the ideal gas law PV = nRT with R = 8.31 L-kPa/mol-K).

What acid and base are neutralized to give potassium nitrate salt?

Which instrument, along with a telescope, allows study of the wavelengths of visible light coming from a star?

Draw one product that you would expect from the reaction of 1 mol of 1,3-butadiene and 1 mol of h2o, cat. h2so4?

A solution of H2SO4 with a molal concentration of 5.25m has a density of 1.266 g/ml. what is the molar concentration of this solution?

An animal that backs on a warm rock during the morning hours but retreats to the shade of the rocks during the middle of the day is mostly likely a (n) A. ectotherm B. endotherm C. vertebrate D. chordate

How much water vapor can a cubic meter of air hold at 25 degrees celcius

When 0.50 L of a 12 M solution is diluted to 1.0 L, what is the resulting molarity?

A 52.9g sample of brass, which has a specific heat capacity of 0.375·J·g-1°C-1, is put into a calorimeter (see sketch at right) that contains 100.0g of water. The temperature of the water starts off at 15.0°C.