An isotope of xenon has an atomic number of 54 and contains 77 neutrons. What is the xenon isotope's mass number? 23 54 77 131

Hunter drew a representation of the atoms of a gas. The illustration shows atoms moving freely at high speeds.

What does chemical weathering do?

Which of the following questions can be answered by science? Are mind, body, and soul related to one another? Are physical and chemical changes a part of nature? Does studying science have better prospects than studying history?

The ionization energies in kcal for mg and ca are mg ca 1st 176 141 2nd 346 247 3rd 1847 a) indicate the reasons for the relatively high 3rd ionization energy for magnesium.

When 96 grams of water are produced how many grams of hydrogen must react according to the equation 2H2+O2 react to form 2H2O?

What is true about the energy involved in a chemical reaction? A. The amount of energy is constant, but it is converted from one form to another. B. The amount of energy decreases as it is converted from one form to another. C.

Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface?

The air in an inflated balloon (the system) absorbs 125 J of heat from its proximity to a fire. The balloon expands and does 85 kJ of work. What is the change in internal energy (in kJ) (ΔU) for the system? Round to the nearest whole number.

Is a cytoplasm made of 80 percent of water

Calculate the acid concentration of a sample of acid rain with a ph of 4.20