1) What are the properties of the particle model of a solid? a) Not in certain position b) Not moving c) particles are close together d) loose particles 2) In solids, the particles are: a) Far apart and move freely b) Close together and slide past each other c) Far apart and not moving d) Close together and vibrate in fixed positions 3) Which of the following best describes the particle arrangement in a solid? a) Random and spread out b) Regular and tightly packed c) Random and moving freely d) Regular but far apart 4) Which statement about liquids is true? a) They have a fixed shape and fixed volume b) They have neither fixed shape nor volume c) They have a fixed volume but take the shape of their container d) Their particles do not move 5) According to the particle model, solids cannot be easily compressed because: a) Their particles are tightly packed with almost no space b) Their particles move freely c) Their particles have a lot of space between them d) Their particles are very far apart 6) When you pour sand, it seems to “flow” like a liquid because: a) Sand particles dissolve in air b) Sand turns into a liquid when poured c) Each grain of sand acts as a tiny solid particle that moves independently 7) What does the particle model explain? a) Why substances change color b) How mixtures are separated c) How particles behave in solids, liquids, and gases d) Why solids always melt 8) Which of these substances behaves most like a liquid? a) Ice cubes b) Flour powder c) Wood block d) Iron nail 9) When a liquid changes to a solid, what happens to the particles? a) They move faster and farther apart b) . They gain more energy c) They spread out evenly d) They slow down and become tightly packed 10) Melting is the process of changing from: a) Solid to liquid b) Liquid to gas c) Liquid to solid d) Gas to solid 11) What happens to the particles during freezing (solidification)? a) They move faster and spread out b) They gain energy c) They lose energy and become tightly packed d) They stop vibrating completely 12) When a liquid freezes, its particles: a) Move more freely b) Lose energy and become fixed in position c) Gain energy and spread out d) Stop moving forever 13) . What causes a solid to melt? a) Losing heat energy b) Gaining heat energy c) Being compressed d) Increasing pressure 14) According to the particle model, when a solid changes to a liquid: a) The particles move faster and slide past each other b) The particles stop moving c) The forces between particles become stronger d) The arrangement of particles becomes more ordered 15) Which statement is true about melting and freezing? a) Both form new substances b) Both involve a change in the type of particles c) Both are chemical reactions d) Both are physical changes 16) Why are melting and freezing called physical changes? a) Because new substances are formed b) Because heat is not involved c) Because only the state changes, not the substance itself d) Because particles disappear 17) What is a chemical reaction? a) A process that forms new substances b) A process that can be easily reversed c) A physical change d) A change that only affects the shape of a substance 18) What kind of change happens when cement hardens into concrete? a) Physical change b) Chemical change 19) Why can’t hardened concrete return to its original form? a) Because a new substance is formed b) Because the water dries out c) Because it’s a mixture 20) Which process shows a chemical change? a) Water boiling b) Ice melting c) Chocolate melting d) Cement reacting with water to form concrete

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