Which is the number in front of chemical formulas that represents the ratio of each substance shown in a balanced chemical equation?

a. coefficient

b. covalence number

c. catalyst

How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 2Al + 3O2 → 2Al2O3

Give the complete ground-state electron configuration for silicon (si). express the complete electron configuration using superscripts where appropriate. for example, the configuration for li would be entered as 1s^22s^1

What gas is released during cellular respiration?

On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69Ga and 39.71% for 71Ga. What is the atomic mass of gallium for this location? The mass of 69Ga is 68.7200amu. The mass of 71Ga is 70.9200amu.

A furnace that provides heat by burning methane gas (CH4) must have the correct mixture of air and fuel to operate efficiently. What is the mole ratio of air to methane gas in the combustion of methane? Air is 20% oxygen.

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal

Why is the use of natural gas as a full becoming more common

A swimming-pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 9.2. What should she do to correct this situation? A. Add water. B. Add base. C. Add acid. D. Do nothing.

What type of rock is sandstone

According to the Br? nsted-Lowry theory, water A. acts as a base when it accepts a hydrogen ion. B. can be neither an acid nor a base. C. can act as an acid by accepting hydrogen ions. D. can accept but not donate hydrogen ions.