Circle one correct answer for each of the following questions. (2pts each) 1) Chemical equations are...

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Circle one correct answer for each of the following questions. (2pts each) 1) Chemical equations are balanced in order to obey the law of A) definite proportions. Omass conservation. B) mass action. D) multiple proportions. 2) Which one of the following represents a physical change? A. water, when heated to 100 "C, forms steam B. bleach turns hair yellow C. sugar, when heated, becomes brown D. milk turns sour E. apples, when exposed to air, turn brown 3) Which one of the following represents a chemical change? A. boiling water to form steam B. burning a piece of coal C. heating lead until it melts D. mixing iron filings and sand at room temperature E. breaking glass 4) The diameter of Earth is 12.7 Mm. Express this diameter in centimeters. A. 1.27 X 105 cm B. 1.27 X 10 cm D. 1.27 X 10° cm C. 1.27 X 10' cm E. 1.27 X 10° cm Circle one correct answer for each of the following questions. (2pts each) 1) Chemical equations are balanced in order to obey the law of A) definite proportions. Omass conservation. B) mass action. D) multiple proportions. 2) Which one of the following represents a physical change? A. water, when heated to 100 "C, forms steam B. bleach turns hair yellow C. sugar, when heated, becomes brown D. milk turns sour E. apples, when exposed to air, turn brown 3) Which one of the following represents a chemical change? A. boiling water to form steam B. burning a piece of coal C. heating lead until it melts D. mixing iron filings and sand at room temperature E. breaking glass 4) The diameter of Earth is 12.7 Mm. Express this diameter in centimeters. A. 1.27 X 105 cm B. 1.27 X 10 cm D. 1.27 X 10° cm C. 1.27 X 10' cm E. 1.27 X 10° cm

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1 The answer is option C which is Mass conservation When we balance an equation we calculate the rea... View the full answer