You determined that Cr2O3 is the limiting reactant in the reaction below. If the reaction begins with85.00 grams of Cr2O3 and157.0 grams of silicon, how many grams of the excess reactant will be used?

Which of these elements has the most chemically reactive atoms? a. gold b. argon c. carbon d. chlorine

Magnesium metal burns in the presence of oxygen gas to produce solid magnesium oxide. You are given 4.00 grams of magnesium and an excess of oxygen gas in a tank. How many grams of magnesium oxide can be produced?

How many atoms are in 2 Fe? 1 2 3 4

Consider NH3 and PH3. Electronegativities: P = 2.1, H = 2.1, N=3.0. Which statement is false? The bond dipoles in NH3 are directed toward the nitrogen atom. For PH3 there is no bond dipole moment. Both molecules are polar.

When copper (I) oxide dissolves in dilute sulfuric acid, copper (II) sulfate and copper are produced a) write the balanced chemical equation for the reaction b) discuss the changes in the oxidation states of copper in this reaction c) is copper (I)

Why does a ball rolling along a level sidewalk slow down and then stop

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas

The SI unit for current is: joules volts ohms amps