How are the sizes of stars measured?

I just need a simple answer

You have a chemical sealed in a glass container filled with air. the glass container has a mass of 200.0 grams and the chemical has a mass of 750 grams. the total mass of the setup is 950 grams.

If Hershey and Chase had used radioactive oxygen in their experiments instead of phosphorus and sulfur, what results would they have likely obtained? a. They would have observed a radioactive signal in both the pellet and the liquid. b.

A student calculates the volume of a graduated cylinder to be 43.26 ml. The actual volume is 42.32 ml. What is the percent error? Show your work below. Round your answer to two digits.

What would cause the percent yield of reaction to be less than 100%

Describe, in terms of kinetic and potential energy, what happens if a large boulder were to fall off a cliff and come to rest on the ground. Include in your explanation how you would determine the initial PE of the boulder.

What kingdom is humans in!

Propane (C3H8) has a molar mass of 132 g/mole. You started out the day with a tank containing 9071 g of propane. At the end of the day, your tank contained 7532 g of propane gas. How many moles of gas did you use?

Why decomposition of ammonium nitrate is a redox reaction?

Two formulas for compounds containing hydrogen and oxygen are H2O and H2O2. Do these formulas represent the same compound? Explain.

My dog made become frightened and cover when he hears loud thunder this is an example of a reaction to What kind of stimuli A. chemicals B. light C. touch D. sound