What is the total number of molecules represented by the following equation? 2C4H10 (g) + 13O2 (g) 8CO2 (g) + 10H2O (g) ?

A 18

B 4

C 15

D 33

What is the molarity of 0.50 liter of an aqueous solution that contains 0.20 mole of NaOH (gram-formula mass = 40. g/mol) ?

The element in Period 3 that has the lowest first ionization energy is

How many moles are in 100.56g HCI?

You have a 100.0mL graduated cylinder containing 50.0mL of water. You drop. 193g piece of brass into the water. To what height does the water rise in the graduated cylinder.

The Lewis model predicts that the formula of a compound formed between bromine and aluminum is: The Lewis model predicts that the formula of a compound formed between bromine and aluminum is: AlBr2 AlBr3 AlBr Al2Br none of the above

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