Which types of changes observe the law of conservation of mass?

a. only changes of state

b. only physical changes

c. only chemical changes

d. all of the above

A solution has a ph of 10.20 at 25°c. what is the hydroxide-ion concentration at 25°c?

A bike tire is inflated to a pressure of 984 kPa at 298 K. What is the temperature if the pressure decreases to 872 kPa?

Will the second method for determining volume (water displacement) work for ANY object or JUST an irregularly shaped one?

A reaction produces 0.875 moles of h2o. how many molecules are produced?

We divide the electromagnetic spectrum into six major categories of light, listed below. Rank these forms of light from left to right in order of increasing wavelength. To rank items as equivalent, overlap them.

Find the de Broglie wavelength (in nm) associated with an electron that is moving with a velocity of 5230 km/s. The electron rest mass is 9.11 x 10⁻³¹ kg.

Baby Caitlen is about to turn one year old. She loves to play peek-a-boo and acts so surprised each time a hidden face appears behind her dad's hands. Why is she surprised?

8. What is an energy level? A) The region outside the nucleus where the neutron is likely to be moving. B) The region outside the nucleus where the electron is likely to be moving.

In alpha decay, alpha particles are ejected from the nucleus. Which equation represents alpha decay? 241Am 23Np + 4He 18F → 180 + °C 14C → 14N+_e 152 Dy → 15. Dy+y

In a study of the conversion of methane to other fuels, a chemical engineer mixes gaseous methane and gaseous water in a 0.778 L flask at 1,072 K. At equilibrium, the flask contains 0.206 mol of CO gas, 0.187 mol of H2 gas, and 0.187 mol of methane.