Consider a redox reaction: Mg + Cu2+ → Mg2+ + Cu. Which of the following is/are true? Select all that apply.(Hint: OIL RIG)(A) Mg is reduced.(B) Cu2+ is reduced.(C) Mg is oxidized.(D) Mg is oxidized.

The balanced equation for the combination reaction of hydrogen gas and solid iodine is: H2(g) + I2(s) + 52 kJ → 2 HI(g) Is this reaction is exothermic or endothermic? [BLANK-1]. The enthalpy change (∆H) value for this reaction should be indicated with positive or negative sign. [BLANK-2].

What coefficient is placed in front of O2 to complete the balancing of the following equation?  CH4(l) + ? O2(g) → CO2(g) + 2 H2O(g)

Consider a hypothetical compound with the chemical formula: C15H14O11. The molar mass of this compound is _________ g/mol.Note: Make sure to use the atomic masses given in the periodic table provided. Round the final answer to 5 significant figures.

If the electronegativity difference between the bonded atoms is 2.0 or higher, the bond is considered _____________.

Consider three samples of sodium compounds:1 mol Na2SO4, 1 mol Na2CO3, and 1 Na2HPO4 All three samples have same number of sodium atoms.

The calculations show that a reaction should produce [x] g of the product. However, a chemistry lab experiment produces [y] g of pure product. What is the percent yield of this product? ____________%. Just enter the number (without percent symbol).

Consider the following reaction: 2 KClO3(s) →∆ 2 KCl(s) + 3 O2(g)What type of reaction is this?

Consider a chemical compound with the empirical formula CxHyOz. The mass percent data for this compound is summarized below:C = 17.03%, H = 3.57% and O = 79.40% by mass. Determine the empirical formula for this compound. Make sure to keep at least 4 decimal places in your mole calculations and enter the empirical formula in CxHyOz format (x, y, z = whole numbers). Do not change the order of elements. Enter the empirical formula in the text box provided and show complete work on the scratch paper. You must submit your work to receive credit. [Hint: Use the Percent → Grams → Mol → Simplest Whole Number sequence.]

The shape (or geometry) of the polyatomic ammonium ion, NH4+ is ____________.