Why are hydrogen and oxygen written as H2 and O2?

1. They are diatomic molecules.

2. All individual elements have the subscript 2.

3. To balance the equation.

Choose the false statement about an object that has mass. A) it has volume B) it must be heavy C) it takes up space

Which statement about weak bonds is correct?

Explain why the first ionization energy K is less than that of Ca

Explain endothermic reaction?

Question 2: you have two systems: 1) solid gold and water 2) solid sodium and waterWhich one can spontaneously release energy and why?

Compare and contrast each of the following terms. mass and matter

The rate constant of a reaction is 4.7*10-3 s-1 at 25°C, and the activation energy is 33.6 kJ/mol. What is k at 75°C?

What are the pros of using steel?

Cation a has a + 3 charge and is small. cation b has a + 1 charge and is large. which is more likely to occupy negatively charged sites on a clay mineral given equal concentrations in solution? cation a cation b they are the same

Show your work, including units, for the following series of calculations: a. How many moles of Al are in 1.25 g of Al? b.