Helium has an atomic number of 2 and atomic mass of 4. explain.

Hydrogen sulfide is composed of two elements: hydrogen and sulfur. in an experiment, 6.500 g of hydrogen sulfide is fully decomposed into its elements. (a) if 0.

24. Which Portuguese explorer sailed around Africa and across the Indian Ocean to reach India? A Bartolomeu Dias B. Pedro Cabral C. Vasco da Gama D. Prince Henry

Malika wants to calculate the velocity of her mom's car as it travels down the interstate. She knows that her mom is traveling east. What else does she need to know? Check all that apply.

Which reactions performed in the experiment involved chemical changes?

Combustion of a 0.9835g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900g of CO2 and 1.070g of H2O. What is the empirical formula of the compound?

A change of temperature equal to one kelvin is equal to a change of temperature of how many degrees celsius?

A solution has [h3o+] = 4.2*10-5 m. use the ion product constant of water kw=[h3o+][oh-] to find the [oh-] of the solution.

A. A rapid cooking method that uses high heat from a source located above the food.

What is the number of copper atoms in 1naira coin which weighs 7.39g assuming the material of which the coil is made is 86% copper Na=n/n number of moles/n

Which of the following statements are consistent with Rutherford's nuclear theory as it was originally stated? (A) The volume of an atom is mostly empty space. (B) The nucleus of an atom is small compared to the size of the atom.