What is a pure substance that cannot be chemically broken down into simpler substances?

The decomposition of calcium carbonate to calcium oxide and carbon dioxide only takes place at very high temperatures, making the direct measurement of h for this reaction difficult.

The atoms of a certain element each contain 11 protons and 1 valence electron. Describe this element and its reactivity

Why are cleaning compounds often bases?

What clues indicate a rusty bike has gone through a chemical change

In real-life situations, workers collect water samples in a lake or stream instead of using Samples A and B. For this lab to work, sodium carbonate was added to make the water samples alkaline.

Enter a balanced chemical equation for the combustion of gaseous methanol.

Being able to identify good source of scientific information and apply the knowledge to problems in your life is a part of having A Scientific hypothesis B Scientific inquiry C Scientific literacy D Scientific laws

Hexane and heptane are miscible with each other in all proportions. In making a solution of them, is the entropy of the system increased, decreased, or close to zero, compared to the separate pure liquids? a. The entropy of the system is increased.

Determine the hydronium ion concentration in a solution that is 0.00014 M HCl. Answer in units of M.

Which element in period 2 has the most mass