List four observation that suggest a chemical change is occuring

Sodium+sulfuric acid

The chemical formula for the initial sample is mnso4·h2o and the chemical formula for the final sample is mnso4. use their molecular masses to calculate the theoretical percent mass of water in the initial sample.

What is the structural formula for the following Molecules? 1. Water 2. Ammonia 3. Carbon Dioxide 4. Chlorine 5. Ethane

The total variety of organisms that live in the biosphere

The chemical symbol for sodium is

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.

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.