Which is the correct chemical equation for the following statement? "Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide."

4Na + 2O2 → 2Na2O + O2

Na2O → 2 Na + O2

Na2 + O2 → 2 NaO

Na2O + O2 → 2 Na

Depending on their beak size and shape, some finches get nectar from flowers, some eat grubs from bark, some eat small seeds, and some eat large nuts. Which statement best describes the interactions among the finches and the food supply? a.

Solutions of aluminum nitrate and sodium sulfate react to form sodium nitrate and aluminum sulfate. Classify this reaction.

Nacl is an ionic solid. the na + and cl - ions in nacl are bonded through an electrostatic force of attraction commonly known as the ionic bond. water is a polar solvent.

Solution X has a pH of 9.4, and solution Y has a pH of 7.4. a. What is the [H3O+] in the solution X? Express your answer using one significant figure. b. What is the [H3O+] in solution Y? Express your answer using one significant figure.

Radiation transfers thermal energy through A) light B) waves C) fluids D) direct contact?

Why does an exothermic reaction need activation energy?

The temperature of 15 grams of water increases by 3.0 degress. how much heat was absorbed by water?

What are the four types of stoichiometry problems?

100 ml oxygen at 1.75 atm and 200ml nitrogen at 0.6 atm are passed to a 500 ml vessel. Calculate the total pressure of the mixture in the vessel at same temperature

Which is the best metal to use in an alloy to increase its electrical conductivity