4. Which of the following statements correctly describe atoms? Select all that apply.

A) Atoms have mass,

B) Atoms are the basic unit of a chemical element.

C) Matter is made of atoms.

D) Atoms take up space.

It is possible to determine the ionization energy for hydrogen using the Bohr equation. Calculate the ionization energy for an atom of hydrogen, making the assumption that ionization is the transition from n=1 to n=infinity. A. - 2.18 x 10-18 J B.

Consider the following intermediate chemical equations. NO (g) + O (g) - - > NO2 (g) + O2 (g) ΔH1 = - 198.9kJ 3/2 O2 (g) - - >) 3 (g) ΔH2 = 142.3kJ O (g) - - >1/2 O2 (g) ΔH3 = - 247.

The molecular formula for Vitamin C is C6H8O6. What is the empirical formula?

Susan needs to measure and heat the chemical she wants to use in an experiment with a graduated cylinder. Which graduated cylinder is suitable for use? A) Plastic cylinder B) Glass cylinder C) Metal cylinder

A student put a bottle of water and a can of sugary soda in freezer to chill quickly. The water was frozen but the sod a was not explain why

What pressure (in atm) will a sample of o2 gas occupy at 100.0 ml, if o2 has a volume of 25.00 ml at 2.0 atm?

What happens when francium and nitrogen are mixed

Which type of chemical reaction occurs in 2KClO3 Right arrow. 2KCl + 3O2

An electrochemical cell is constructed using two half-cells: Al (s) in Al (NO2) 3 (aq) and Cu (s) in Cu (NO3) 2 (aq). The two half cells are connected by a KNO3 salt bridge and two copper wires from the electrodes to a voltmeter.

7. If you fill a balloon with 5.2 moles of gas and it creates a balloon with a volume of 23.5 liters, how many moles are in a balloon at the same temperature and pressure that has a volume of 14.9 liters