The matter is divided in: pure substances and mixtures. Pure substances that can be made of the same type of atoms (elements) or of many atoms in a link (Molecules). Mixtures are the combination of pure substances. Which of the following images best represents molecules?, Image 1, Image 2, Image 3, Image 4, The image 4 is made of atoms connected that can be different and atoms alone. Therefore represents:, Molecules, Pure substance, Mixture, Elements, Mass, Volume and density are properties of the matter. The mass refers to the amount of matter, the volume the occupied space; and density refers to the relation between the mass and volume; a big amount of mass in a small volume is a big density and small amounts of mass in a big space is a small density. Sara places a wooden block into a beaker filled with water. The wooden block floats on top of the water because of its density. Which of the following best explains why the wooden block floats?, Wood typically floats on water., The wooden block has less mass than the water., The water has more volume than the wooden block., The wooden block is less dense than the water., Which of the following images has the lowest and highest density?, Image 1 and image 2, Image 2 and image 3, Image 2 and image 4, Image 4 and image 3, Maria is conducting an experiment and heating a block of aluminum using large amounts of energy. The process of this transformation is:, Melting, because it shows the transformation of a solid into a liquid., There is no change, the metal remains in its original state., Chemical change, because the identity of the metal changes., Sublimation, because it shows the transformation of a solid into a liquid, Physical changes involve alterations in the state or form of a substance without changing its chemical composition, such as changes in shape or state. In contrast, chemical changes result in the formation of new substances with altered chemical compositions through the breaking and forming of chemical bonds. Sarah conducts an experiment where she places a piece of magnesium ribbon into a beaker containing hydrochloric acid. After some time, she observes bubbles forming on the surface of the magnesium ribbon and notices that it starts to dissolve. Regarding this experiment, she can conclude that:, There is no change in the matter because the magnesium ribbon remains the same., There is a physical change because the bubbles do not affect the composition of matter, There is a chemical change because the dissolving of magnesium affects the identity of the magnesium ribbon., There is a chemical change because the dissolving of magnesium only affects the shape but not the identity of matter., Which of the following are examples of physical changes?, Rusting of iron and decomposing of organic matter., Cutting a piece of paper and dissolving sugar in water., Boiling water to form steam and digestion of food in the stomach., Fermentation of grapes and melting ice to form water., Mr. Johnson attempts to separate a heterogeneous mixture of sand and salt while preserving the identity of the substances. He decides to separate them using the process of dissolving the salt in water and then evaporating the water to recover the salt. According to Mr. Johnson's decision, is it possible to say that:, It was a bad decision because dissolving salt in water involves a chemical change., It was a good decision because dissolving salt in water is a physical change that does not affect the identity of the salt., It was a bad decision because evaporating water is a process that changes the identity of the water., It was a good decision because evaporating water generates chemical changes., Jerónimo develops an experiment about density and buoyancy using eggs, salt, and water. He observes that as he adds more salt to the water, the eggs float higher. Which of the following statements best describes the relationship between density and the amount of matter?, Increasing the amount of matter decreases density., Increasing the amount of matter has no effect on density., Increasing the amount of matter increases density, Increasing the amount of matter decreases buoyancy.

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