A temperature change in a reaction indicates a physical change.

True

False

What is one way to describe elements? A. building blocks B. they break down easily C. smallest particles of material D. they are the most expensive materials on earth

In a redox reaction, why does an element's oxidation number decrease?

In a reactor nuclear energy is produced in the blank

When bonding to form long chains, carbon is able to form?

Ammonia is a weak base because it produces ___ ions in solution

J. J. Thomson A) Electrons are in orbital levels. John Dalton B) Atoms are the smallest unit of an element. Ernest Rutherford C) Electrons are scattered within the atom. Niels Bohr D) Protons are at the center of an atom.

Which answer best describes an alloy

Olive oil has a density of 0.92 g/mL. How much would 1 liter of olive oil weigh in grams?

How many grams of CO are needed to react with an excess of Fe2O3 to produce (210.3 g Fe) 209.7 g Fe? Show your work. CO (g) + Fe2O3 (s) - - > Fe (s) + CO2 (g)

Which is the molar mass of H2O? 10.02 g/mol 16.00 g/mol 17.01 g/mol 18.02 g/mol