NY Regents Chemistry Jan 2023 exam 3. An excited potassium atom emits a specific amount of energy when one of its electrons moves from...

What is the mass of 2.50 moles of oxygen gas? Solution: Oxygen gas is a diatomic element, which means its formula is O2. The molar mass...

Regents Chemistry Exam January 2023 2 Which two particles each have a mass approximately equal to one atomic mass unit? (1) positron and...

Regents Chemistry January 2023 Which conclusion was developed as a result of the gold foil experiment? (1) Atoms are mostly empty space....

Which statement describes a concept included in the wave-mechanical model of the atom? (1) Protons, neutrons, and electrons are located...

Element 117, Uus, has been synthesized and has at least two isotopes, Uus-293 and Uus-294. Atoms of Uus-293 can be made by bombarding...

NY Regents Chemistry Exam June 2022 During a laboratory activity, appropriate safety equipment is used and safety procedures are...

NY Regents Chemistry Exam June 2022 A 3% hydrogen peroxide solution, H2O2(aq), is commonly used as a disinfectant. Hydrogen peroxide,...

NY Regents Chemistry Exam June 2022 One sample of tap water contains dissolved ions such as Ca^2+(aq), Mg^2+(aq), and CO3^2+(aq). A...

NY Regents Chemistry Exam June 2022 An average person on board the International Space Station (ISS) requires 840 grams of oxygen per...