What phase change is a type of. Physical change, chemical change, nuclear change, covalent change

Which of the following is true about two neutral atoms of the element zinc? They will always have different masses. Electrons are missing in both the atoms. Both have an equal number of protons. They have different properties.

How many electrons does phosphorus need to gain to have a stable outer electron shell 1 2 3 4

The idea of arranging the elements in the periodic table on the basis of chemical and physical properties for the most part according to their atomic masses, is attributed to

According to early chemists, which substances were classified as elements? A. those that could not be broken down further by physical means B. those that could not be broken down further by chemical means C.

Which statement describes the acid found in vinegar (acetic acid) ?

NaOH+HCl--> NaCl+H2O what is the total number of grams of H2O produced when 116 grams of the product, NaCl, is formed?

Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

You have a balloon containing 1 L of air at STP in a vacuum chamber. What will the volume of the balloon be when you reduce the pressure by half and increase the temperature to 373 K?

Which method will correctly determine whether the forces on an object are balanced or unbalanced? A. Multiply the forces in the horizontal direction by the forces in the vertical direction. B.

Carbon is found in all known forms of life. Which statement best describes why carbon is uniquely suited to forming macromolecules such as those found in living organisms? A. Carbon forms large compounds that are not chemically reactive. B.