How many electrons should be shown in the lewis symbol for hydrogen?

How many moles of nitrogen gas are there in 6.8 liters at room temperature and pressure (293 K and 100 kPa) ?

Balance the equation __C7H6O2 + __O2 - > __CO2 + __H2O

How many grams are in 7.62 X 1017 molecules of oxygen?

What does all flexible objects have in common

Zn (s) + 2HCl (aq) - >ZnCl2 (aq) + H2 (g) Which statement is true at STP? (The atomic mass of Zn is 65.39 u.) 2 mol of HCl produce 1 L of H2 gas. 1 L of Zn produces 1L of H2 gas. 65.39 g of Zn produce 22.4 L of H2 gas.

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