1. What phase change is being observed when an ice turns to liquid?*1 pointChoose This is a required question2. What phase change in matter can be observed if we place water in the freezer of the refrigerator?*1 pointChoose3. When water droplets are found outside  the glass of cold water what phase change is being observed?*1 pointChoose4.When dry ice is placed on the top of the table, after couple of minutes there is no dry ice left. What kind of phase change is it?*1 pointChoose5. The temperature at which the substance melts is ________________ the temperature at which the substance freezes*1 pointChoose

What are the phase change processes taking place when a substance is in equilibrium between liquid and gas phases?A.Evaporating and condensingB.Freezing and thawingC.Expanding and contractingD.Melting and boilingSUBMITarrow_backPREVIOUS

1. Which phase of matter has definite volume but no definite shape?1 pointa. solidb. liquidc. gasd. plasma2. This phase of matter includes charged particles and its atoms behave much like another phase.1 pointa. solidb. liquidc. gasd. plasma3. What must change in order for a phase change to occur?1 pointa. Heat energy must increase.b. Heat energy must increase OR decrease.c. Heat energy must decrease.d. Heat energy remains the same.Other:4. Solid changes to liquid.1 pointa. Evaporationb. Sublimationc. Condensationd. Melting5. Gas changes to a liquid.1 pointa. Condensationb. Freezingc. Evaporationd. Deposition6. Rusting of iron is an example of a _____________.1 pointPhase changeChemical changePhysical changeDouble replacement reaction7. Example of physical change. (Check all that would apply.)1 pointPopsicle melting.Broken window.Baked chocolate chip cookies.Chopped firewood.

13. The freezing point of water is the same as its ______.*1 pointA. boiling point.B. evaporation point.C. melting point.D. sublimation point.14. Which state of matter undergoes changes in volume most easily?*1 pointA. solidB. liquidC. gas 15. Which statement best explains the fact that gases can be compressed?*1 pointA. The particles in a gas do not have a fixed volume.B. The particles in a gas are very far apart.C. The particles in a gas have no force of attraction (bonds) between them.D. The particles in a gas are constantly moving very rapidly.16. Which of the following states of matter has the highest density?1 pointA. SolidB. LiquidC. Gas17. In which state of matter are particles held together by weak forces of attraction and are able to move freely over long distances?*1 pointA. SolidB. LiquidC. Gas18. Particles of all matter are in constant random motion.*1 pointA. TrueB. False19. These particles are held together by very strong forces of attraction*1 pointA. SolidB. LiquidC. GasD. Plasma20. What happens to particles of liquid when they are heated?*1 pointA. They slide over one another faster and move further apartB. They slow down and compressC. They stop movingD. They slide over one another slower and move closer together

Carbon dioxide changes from a solid – dry ice – to a gas at -78.5°C. Determine what type of change this is. Physical changeChemical reactio

Which phase change temperatures are identical on the phase diagram? Select all that apply.melting point - boiling pointfreezing point - melting pointboiling point - condensation pointcondensation point - melting point