All the following conditions must be present for a fire to start except A. nitrogen to support the fire. B. a heat source (such as a spark). C. fuel (such as wood or gasoline). D. oxygen to support the fire.

What is a proton provide explanation

A liquid has a mass of 54.5g and a volume of 50.0 mL. calculate the specific gravity. How would I work this out

Whatvis thr atomic number of a sodium atom that has 11 protons and 12 neutrons?

The majority of the elements essential to life are found in what part of the periodic table?

How many groups are there in the modern periodic table?

What process transform solar energy into chemical energy?

When the reaction was carried out the calculated theoretical yield for water was 176 grams but the measured yield was 148 grams what is the percent yield

For an atom's electrons, how many energy sublevels are present in the principal energy level n = 4?

Attempt 2 A sample of gas contains 49.16 % N 2 gas, 19.85 % Br 2 gas, 9.95 % CO 2 gas, and 21.04 % of an unknown gas. The average atomic mass of the gas mixture is 50.71 u. Calculate the atomic mass of the unknown gas.

A chemist determined by measurements that. 040 moles of gold participated in a chemical reaction. calculate the mass of gold that participated in the chemical reaction. round your answer to significant digits.