In the reaction C7H16 + __O2 → 8H2O + 7CO2, what coefficient should be placed in front of O2 to balance the reaction?

7

8

11

no coefficient is needed

Which of the following correctly compares the uses of line graphs versus pie chart

A compound has 50% sulfur and 50% oxygen. what is its empirical formula?

A 10.0-gram sample of which element has the smallest volume at STP? (1) aluminum (3) titanium (2) magnesium (4) zinc

On analysis, an equilibrium mixture for the reaction 2H2S (g) 2H2 (g) S2 (g) was found to contain 1.0 mol H2S, 4.0 mol H2, and 0.80 mol S2 in a 4.0 L vessel. Calculate the equilibrium constant, Kc, for this reaction.

Why is second ionization energy larger than first ionization energy

How many of the following elements have 2 unpaired electrons in the ground state? C Te Hf Si A) 1. B) 2. C) 3. D) 4.

Which has a higher frequency, a neutron or electron? Why?

1) Identify the intensive properties of a sample of matter: A. mass B. hardness C. color D. volume E. reflectivity

Suppose you have a buffer containing 0.400 M hydrazine and 0.300 M hydrazinium chloride at equilibrium. Then you add 25.2 g of NaOH to 2.0 L of the buffer. What change in pH is caused by the addition of the base? A) 0.99 B) 0.40 C) 8.71 D) - 0.36

The heart is an example of which level of organization within an organism? O cell organ tissue organ system O O