The student understands that matter can be classified according to its properties and matter is conserved in chemical changes that occur within closed systems.
Use the periodic table to identify the atoms and the number of each kind within a chemical formula.
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Q 1/70
Score 0
Which of the following is an example of a chemical change where matter is conserved?
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Burning wood in a fireplace.
Dissolving salt in water
Melting ice cubes
Chopping vegetables
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70 questions
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Which of the following is an example of a chemical change where matter is conserved?
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A student observes a chemical reaction in a closed container where a solid precipitate forms from two clear liquids. How does the number of atoms of each element before the reaction compare to the number of atoms after the reaction?
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Which of the following is an example of a heterogeneous mixture?
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Which of the following models best represents a sample of a compound?
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A student creates a model using a jar of water and sand. After shaking the jar, the sand eventually settles at the bottom, and the two substances remain visibly distinct. How should this model be classified?
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15
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A student dissolves a spoonful of salt into a glass of water and stirs until the salt is no longer visible and the liquid is clear throughout. How should this resulting liquid be classified?
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A student uses a model consisting of red spheres and blue spheres that are physically mixed in a container but not joined together. The spheres are distributed such that the ratio of red to blue is the same in every part of the container. How should this model be classified?
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A scientist is observing a model of a substance that can only be separated into different types of matter by breaking chemical bonds through a chemical reaction. How is this substance classified?
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A student uses a model to show a substance that consists of only one type of atom and cannot be broken down into simpler substances by chemical means. How should this matter be classified?
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A student creates a model of a granite rock using different colored clay pieces to represent minerals like quartz, feldspar, and mica. The pieces are pressed together but remain visible as distinct flecks of color. How should this model be classified?
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Which of the following statements correctly identifies the atoms involved in the reaction between sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl)?
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Which of the following statements correctly describes the difference between elements and compounds?
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Which of the following best contrasts the chemical symbol for an element with the chemical formula for a compound?
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Which of the following is a primary difference between a molecule of an element and a molecule of a compound?
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Which of the following identifies a way in which elements and compounds are similar?
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Which of the following examples provides the best contrast between an element and a compound based on their chemical formulas?
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Which of the following scenarios describes a chemical change?
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A student observes a reaction where a solid powder is added to a clear liquid, resulting in the production of bubbles and a decrease in temperature. Why is this considered a chemical change instead of a physical change?
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Which of the following observations provides the best evidence that a chemical change, rather than a physical change, has occurred in a substance?
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A student leaves an iron nail outside in the rain, and after several days, a reddish-brown layer of rust forms on the surface. How should this process be classified?
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7.6(C)
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Which of the following is an example of a physical change rather than a chemical change?
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A student performs an experiment where they grind a large crystal of rock salt into a fine powder. Which statement best explains why this is a physical change and not a chemical change?
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A student mixes two clear liquids together in a beaker. Which observation would most likely indicate that a chemical change has occurred rather than a physical change?
47
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A student adds a spoonful of sugar to a glass of warm water and stirs until the sugar is no longer visible. Which statement correctly classifies this change?
48
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7.6(C)
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A student conducts a science experiment involving several processes. Which of the following is evidence that a chemical change has occurred?
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Which of these observations during a laboratory investigation best indicates that a chemical change, rather than a physical change, has occurred?
50
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7.6(C)
Q.
Given the chemical formula H2O, how many atoms of hydrogen are present in the molecule?
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What is the number of oxygen atoms in the chemical formula C6H12O6?
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How many total atoms of hydrogen are represented in one molecule of ammonium phosphate with the formula (NH4)3PO4?
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How many total atoms of all elements are present in a molecule of aluminum sulfate, represented by the chemical formula Al2(SO4)3?
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In the chemical formula for calcium nitrate, Ca(NO3)2, how many nitrogen atoms are present?
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In the chemical formula for baking soda, NaHCO3, what is the total number of atoms represented?
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In the chemical formula for magnesium hydroxide, Mg(OH)2, how many total oxygen atoms are present?
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Using the periodic table and the chemical formula for vinegar, CH3COOH, how many carbon (C) atoms are represented?
