True or false a substance that undergoes a physical change is a different substance with different properties after the change.

suppose a 375-ml sample of neon gas at 78 c is cooled to 22 c at constant pressure. what will he the new volume of the neom sample

An aqueous magnesium chloride solution is made by dissolving 6.92 6.92 moles of MgCl 2 MgCl2 in sufficient water so that the final volume of the solution is 2.00 L 2.00 L. Calculate the molarity of the MgCl 2 MgCl2 solution.

At 17 °C, a 0.80 mole sample of a gas exerts a pressure of 1.2 atm. What is the volume of the container? a. 16 L b. 23 L c. 0.063 L d. 2400 L

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For the reaction: 3F2 (g) + Cl2 (g) ⇌2ClF3 (g) . When 2.60atm of F2 and 1.25atm of Cl2 are initially placed into an empty 5.00L rigid flask at 325K, the system eventually reaches equilibrium with a total pressure inside the flask of 3.00atm.

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In calcium fluoride, what is the closets noble gas that each ion becomes?

Americium-241 is used in some smoke detectors. it is an alpha emitter with a half-life of 432 years. how long will it take in years for 45.0 % of an am-241 sample to decay?

What is the purpose of forming a scientific hypothesis? It starts a plan to test your idea It provides the answer to your investigation It allows you to prove your idea is correct

N2 + 3h2 2nh3 how many moles of hydrogen are needed to completely react with two moles of nitrogen?