Is elephant toothpaste an exothermic or endothermic? How do you know?

2. Calculate the number of grams of nitrogen dioxide that are produced from 4 moles of nitric oxide. 2NO (g) + O2 (g)  2NO2 (g)

What can be said about a reaction with H = 62.4 kJ/mol and S = 0.145 kJ / (mol·K) ?

Which sequence ranks the chemical reactions in order from fastest to slowest

What is a hydrogen bond?

Explain the difference between two types of elements with respect to the atoms

Which cannot be separated into simpler substances? compound element solution mixture

What jobs involve chesmistry

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?

A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?