What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?

What are the properties of liquids

Which best describes the purpose of a controlled experiment?

This group of elements with a few valence electrons that conducts heat and electricity

What characteristic of helium distinguishes helium from the other noble gases?

There are no negative consequences to using nuclear energy. true or false

Potassium chlorate (used in fireworks, flares, and safety matches) forms oxygen and potassium chloride when heated. KClO3 (s) → KCl (s) + O2 (g) [unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

Explain the iodine clock reaction.

1 75 ml of lemon juice are added to 50 ml of water. What is the percent by vo of the solute?

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster