What is a qualitative observation

This is a property of matter that can be identified without changing the identity of the substance.

What happens to water molecules that form the ice on a road when temperatures rise and the ice begins to melt? a) As temperature increases, the water molecules begin to move farther apart as they lose kinetic energy and form a liquid.

How is a lithium atom (Li) different from a lithium ion (Li+)

Which of the answer choices best describes elements? homogeneous mixtures, always solid, pure substances, very dense.

Now write the electron configurations of what would be the second row of the periodic table. assume this row is the 2s and 2p blocks of elements. what is the inert gas of this row?

In any chemical reaction, the quantities that are conserved are ... A. mass and moles. B. the number of molecules and the volumes. C. the number of moles and the volumes. D. mass and number of atoms.

How many neutrons does element X have if its atomic number is 39 and its mass number is 75?

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.

Percent copper in brass lab

Which statement best describes Rutherford's model of the atom?