Physical Science 8th grade (1).pdf

8 are what hold water molecules together in liquid

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8. ____ are what hold water molecules together in liquid water and in ice. Section 5.2 9. Transfer of heat by direct contact between particles of matter is called ____. 10. A solid whose atoms are arranged in an orderly, repeating pattern would be called a ____ solid. 11. When heat does not transfer from one object to another because both objects are at the same temperature, the condition is called ____. 12. The ability to bend without breaking is known as ____. 13. Solids whose atoms or molecules have no orderly, repeating pattern are called ____ solids. 14. ____ is a solid’s ability to be stretched and then return to its original size. 15. The tendency of a solid to crack or break before stretching very much is known as ____. 16. The ability of an object to maintain its shape even when force is applied is ____. Concepts Section 5.1 1. For each phase or form, identify the matter as liquid ( L ), gas ( G ), or both ( B ): a. ____ definite volume but changes shape to fit the shape of the container. b. ____ generally has the lower density of the two forms. c. ____ expands to completely fill any container. d. ____ bonds between atoms are not completely broken. e. ____ may be called a fluid. f. ____ molecules of this form have more energy. g. ____ force exerted on this form is transmitted as pressure in all directions. 2. Explain what causes pressure in a fluid on a microscopic level. In what direction does the pressure act on the fluid? melting point intermolecular forces condensation heat conduction crystalline elasticity boiling point convection fluid thermal equilibrium amorphous evaporation pressure strength ductility brittleness
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114 C HAPTER 5 S TATES OF M ATTER 3. Describe the two types of forces that act between atoms. 4. Use the words attractive and repulsive to make the following statements true: a. At distances greater than the size of the molecules, intermolecular forces are ____. b. Once molecules are close enough to touch, intermolecular forces become ____. 5. What is the result of intermolecular forces being repulsive and attractive at varying distances? 6. How do thermal energy and intermolecular forces behave with each other? 7. What phase of matter has a low amount of thermal energy, which allows the intermolecular forces to dominate? 8. The solid, liquid, and gaseous phases of a material each have different strengths of intermolecular force compared to the amount of thermal energy. For each diagram below, rank as low, medium, or high: a. the amount of intermolecular force, and b. the amount of thermal energy 9. Name one factor that causes iron to have a higher boiling point than water. 10. As heat energy is added to ice, the temperature increases until it reaches 0°C. What happens at this point and why? 11. Why is ice less dense than water? 12. Why is oxygen transported as a liquid in rocket ships instead of as a gas? 13. How does the evaporation of sweat on a hot day help to cool your body?
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