N a neutral calcium atom, there are 20 protons, 20 neutrons, and 20 electrons. If a calcium atom loses 2 electrons, what would be the calcium's atom's charge?

A sample of NaOH (s) was added to water in a calorimeter. The temperature was monitored as the NaOH dissolved to give the data below. Determine the heat released during the solution process. (Assume the solution specific heat is 4.

Which is defined as the measure of quantity proportional to the number of atoms

Is ability to conduct heat, physical or chemical?

What is true of protons? They are positively charged and located inside the nucleus. They are positively charged and located outside the nucleus. They are negatively charged and located inside the nucleus.

Calculate the density of a solid if it has a mass of 8.47 g and a volume of 3.24 cms.

To identify an unfamiliar organism, you could use a field guide and an

What is the value of Kw at 25°C? 1.0 x 10-14 1.0 x 10-7 1 7 14

Which statement best describes a bacterial cell? A It contains more than one cell. B It is a complete organism. C It is part of a larger organism. D It contains different kinds of cells

Lithium (Li) and oxygen (O) are both in period 2. They both have? a. similar properties b. the same number of protons c. two electron shells d. the same number of electrons

What compares a law and a theory?