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Science

Chemistry

e Festas Acess ▼ Part A

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.

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Weight percent tungsten 0 30 5060 70 80 3600 uLtt 90 100 3400 - 3422°C 3200 L 3000 2800 2665°C 2670°C 2600 C 2600 2580 C 99.8 54 57 66 68 73 2400 2365 C 2337 C 37 48 2200 - 2170'C 2110°C (W) 2092°C 2020°C 51 2000 1970 C 17 (BB) 18 29.5 1800 10 20 30 40 50 60 70 80 90 100 Atomic percent tungsten Answer the following questions with reference to the Boron-Tungsten binary phase diagram shown above. 1. What is the melting point of pure boron? 2. What is the melting point of pure tungsten? 3. At what composition and temperature does the lowest-temperature eutectic in this system occur? 4. At what composition and temperature does the highest-temperature eutectic in this system occur? 5. List all of the known intermetallic compounds in this system. Temperature (°C) B,W. Mad BW,
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