An element's atomic number is 81. How many protons would an atom of this element have? protons

When gravity causes a huge amounts of rock or soil to be carried down a slope this form of erosion is referred to as a

Elements in the same family tend to have the same number of valence electrons. a. True b. False

Using the periodic table, determine which material is most likely to be a good conductor. a. sodium b. bromine c. carbon d. oxygen

Identify the spectator ions for the reaction that occurs when aqueous solutions of lithium sulfide and copper (ii) nitrate are mixed. a. cu2 + and no3- b. li + and cu2+ c. li + and no3- d. s2 - and cu2+ e. no spectator ions are present.

How do you convert grams of zinc to moles of zinc

NO2 and N2O4 undergo the reaction shown. When a sealed container of NO2 reaches chemical equilibrium, which must be true? A) No N2O4 is present. B) No chemical reactions are occurring. C) The rates of the forward and reverse reactions are equal.

What differences did you notice in the different states of water

1. Bubbling or fizzing is an indicator of a. property change b. phase change c. physical change d. chemical change

In the second step of this reaction, isocyanic acid reacts to form melamine and carbon dioxide: HNCO (l) →C3N3 (NH2) 3 (l) + CO2 (g) Balance this reaction and enter the coefficients below.

If the Kelvin temperature of a gas is tripled and the volume if doubled, the new pressure will be ___. A. 3/2 the original pressure B. 1/6 the original pressure C. 5 times the original pressure D. 2/3 the original pressure the answer isnt b or c