Is breaking a pretzel physical change or chemical change

In chemistry, there is a class of compounds called alkanes. they have the general formula, where c stands for a carbon atom and h stands for a hydrogen atom.

The structure of melatonin incorporates two nitrogen atoms. What are the hybridization state and geometry of each nitrogen atom? Explain your answer.

Sulfur oxidation Choose one: A. causes environmental acidification due to production of sulfuric acid. B. contributes to global warming due to CO2 production. C. contributes to global warming due to methane production. D.

Potassium metal and chlorine gas combine in a reaction to produce an ionic compound. What is the correct balanced equation for this reaction?

In living things, traits are passed on from one generatioon to the next by the transfer of

Describe two important functions for carbon dioxide in the atmosphere.

In the chemical reaction: 2 h 2 (g) o2 (g) → 2 h2o (g), with 8 grams of h 2 (2 grams/mole) and 16 grams of o2 (32 grams/mole) and the reaction goes to completion, what is the excess reactant and how much of that would remain

What is the volume of a gold nugget that weighs 2.20 kg? The density of gold is 19.28 g/cc.

Find the percentage composition of carbon in H5C2O

When studying atoms, scientists can ignore the force between charged particles that make up the atoms because it is many millions of times smaller than other forces in the atom.