Which particles form the nucleus of an atom? a. protons and electrons b. protons and neutrons c. positrons and electrons d. positrons and neutrons

In a car cylinder, a piston moves up and down inside a cylinder, causing the substance inside to expand and contract. Which type of substance could be inside the cylinder? Gas only Liquid only Liquid or solid only Gas, liquid, or solid

Which of the following elements has the lowest ionization energy? Rb Sr Cs Ba Xe

Which set of products is most likely to result from the combustion reaction shown below? C4H8 (l) + 6O2 (g)

Solid, liquids and gases what happens to the ice cube

Why are molecule atoms as far away from each other as possible

What does the Ka represent in the equation and why is it important?

Is an american alligator a autotroph?

A/1 * B/C = D, You find yourself with 17 guilders (a gold coin) but you are planning on taking a trip to a country where the local currency is the florin. The current exchange rate is 2 guilders for every 3 florins.

The burning of wood in a fireplace generates heat and light in the form of flames. Which of the following terms best describes this type of reaction? a. condensation reaction b. exergonic reaction c. endergonic reaction d.

How are the number of protons and the number of neutrons related?