An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?

What is the specific heat of a substance that has a mass of 35.0 g and requires 625.0 calories to raise its temperature by 25.0C

The electric and magnetic fields of light are perpendicular to direction of the waves movement True or false

What is the pH of an aqueous solution with [H3O+] = 6*10-12 M?

9. A change in color when two solutions are mixed together is a clue that a __has taken place. A. chemical change B. physical change C. temperature change D. change in state

What is the quantum mechanical model

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.

What element has the electron arrangement 2,8,4?

If you get pregnant in Dec how long will it take for u to get to second trimester