In your own words, describe two patterns on the periodic table.

Write at least two sentences, and be as specific as you can.

Which radioactive element is used as a fuel in conventional nuclear power plants? uranium radium thorium plutonium

How many moles of Magnesium Oxide are produced when 11 moles of oxygen are reacted?

At 333 k, which of the pairs of gases below would have the most nearly identical rates of effusion? a. n2 and o2 b. n2o and no2 c. co and co2 d. no2 and n2o4 e. co and n2

Which statement is true? A molecule having a covalent bond can be ionic. A molecule having a covalent bond is always polar. A molecule having a covalent bond may be polar or nonpolar. A molecule having a covalent bond is always nonpolar.

What does Hund's rule state? An orbital can contain two electrons only if the electrons have opposite spins. An orbital can contain two electrons only if all other orbitals at that sublevel are empty.

How many molecules of nitrogen gas are in 22.4 L? A. 6.022 * 10^22 B. 6.022 * 10^23 C. 6.022 * 10^24 D. 6.022 * 10^25

What is the pH of a 0.0025M HCI solution?

Moles of Zn (NO3) 2 in 131.50g of this substance.

Each degree on the Kelvin scale equals: 1°C 10°C no relationship (different scale) 100°C

2C (s) + 2H2 (g) → C2H4 (g) : ΔH = + 52.4 kJ/mol Which statement about this reaction is correct?