Is the Hertzsprung-Russell diagram still a valid instrument in studying stars, given that it is over 100 years old?

Which of these is a characteristic of science? Its results cannot be generalized. Its findings are usually kept a secret. It follows a clearly laid out methodology. It is based on beliefs and preferences of scientists.

A 0.4657 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 0.8878 g.

In the Lewis structure for a molecule, one of the nitrogen atoms shares six electrons with a carbon atom and has two electrons that it does not share with any other atom.

Alpha-emitting substances, such as radon gas, can be a serious health hazard only if A. your eyes are open. B. their radiation strikes the skin. C. exposure to them is external. D. none of the above

Linda takes her pet German shepherd to a dog park and sees many different breeds of dogs. What is the term for any difference between individuals of the same species? A. evolution B. adaptation C. population D. variation

What needs to happen for a solute to dissolve in a particular solvent? A) the attractions between the solute and solvent molecules must be greater than the attractions keeping the solute together and the attractions keeping the solvent together.

Which is a conversion factor for this statement of equality: 12 in. = 1 foot? 12 feet1 in. 12 feet 1 in. 1 in. 12 feet 1 in. 12 feet 1 foot12 in. 1 foot 12 in. 1 foot1 in. 1 foot 1 in.

Which of the following is an incorrect way of rearranging the density formula: a. m=v•d b. V=d/m c. V=m/d d. Both a and b are incorrect

Describe how the periodic table differentiates between metals and nonmetals. I need a very informative description/explanation on this.

When the ideal gas law is arranged as shown below, what property of the gas is being solved for (represented by the X) ? x equals PV over nR