Jamal wants to make a model of a hill near his house to test the way the slope affects how rain runs down the hill. Which type of model would be best for what he needs?

PD-99 has a half-life of 22.3 hours. How many grams of a 89.8 gram sample would have decayed after exactly three half-lives?

Explain what happens to a fixed sample of gas when its temperature changes.

Which of the following are correct statements? Check all that apply. A. Potassium (K) and magnesium (Mg) are not in the same periodic table period. B. Potassium (K) and magnesium (Mg) are both nonmetals. C.

Which chemical equation below is balanced correctly? 3LiOH + Fe (NO3) 3 yields LiNO3 + Fe (OH) 3 2NaCl + CaO yields Na2O + CaCl2 Zn + HCl yields ZnCl2 + H2 Mg + HCl yields MgCl2 + H2

A cylinder, with a piston pressing down with a constant pressure, is filled with 2.10 moles of a gas (n1), and its volume is 50.0 L (V1). If 0.

What do you use to measure mass

A salt shaker filled with 17.0g sodium chloride contain how many moles?

When a radioactive decay occurs what is released? A. Only protons and neutrons B. Only electrons C. Protons/Neutrons, beta particle, gamma ray D. Only gamma rays

How is the process of scientific inquiry and the design process similar and how they are different.

Provide an explanation at the subatomic level to explain why different colors are observed for different metal salts.