1) Which best explains why models are important in science? a) They represent things we cannot directly observe b) They help scientists work faster c) They are easy to draw and memorize d) They can replace actual experiments 2) Scientists developed atomic models to understand matters better. One of the earliest models was proposed by John Dalton. He said that atoms are tiny, solid spheres that cannot be divided. What is the main reason scientists kept changing the atomic model over time? a) Because atoms are always changing b) Because Dalton’s model was correct c) Because new discoveries gave better explanations d) Because atoms were too large to study 3) Which idea is part of the particle model of matter? a) All matter is made up of tiny, moving particles. b) Matter has no mass. c) Matter is made of waves, not particles. d) Particles of matter are not moving. 4) The diagram shows particles in a solid. Which is NOT true about particles in a solid? a) They vibrate in place. b) They move freely and quickly. c) They are tightly packed. d) They have a fixed arrangement. 5) What happens to the movement of particles as the temperature increases? a) Particles move faster. b) Particles move slower. c) Particles stop moving. d) Particles become solid. 6) What do you think is happening in the substance in terms of temperature change? a) Temperature dropped and solidified the substance b) Temperature was increased, and the substance was liquified. c) The liquid substance was heated and evaporated as gas. d) The liquid substance was frozen and became solid. 7) The relationship between temperature and particle motion tells us that as the temperature decreases, the particles move _______? a) Does not change b) Faster c) Slower d) The same 8) Maria placed iron nails in a container. Then she added sulfur powder. After mixing and heating the two substances, she saw a new black solid form that was different from iron or sulfur alone. What most likely happened? a) A mixture formed. c) The elements disappeared. b) A compound was formed from two elements. d) The sulfur turned into iron. c) The elements disappeared. d) The sulfur turned into iron. 9) What makes a compound different from an element? a) A compound cannot be changed. b) A compound is smaller than an atom. c) A compound is made of one type of atom only. d) A compound is made of two or more elements combined chemically. 10) Water is composed of two hydrogen atoms and one oxygen atom. Which of the following can be the particle model for water? a) Picture A b) Picture B c) Picture C d) Picture D

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