CHEM 101 Final Ivy Tech| 139 Questions| With Complete Solutions

What is the definition of a scientific theory? correct answer: a model that explains the underlying reasons for observations and laws What term best describes a brief statement that summarizes many past observations and predicts new ones? correct answer: scientific law Which of the following is an example of a scientific law? correct answer: In a chemical reaction, matter is neither created nor destroyed. Which of the following would be considered a theory? correct answer: Helium balloons float because helium is less dense than air. The key to success in chemistry is: correct answer: all of the above A plastic block has dimensions of 2.2 cm x 3.0 cm x 1.5 cm and a mass of 12.4 grams. Will the block float in water and why? correct answer: No, because the density of the block is 1.3 g/mL which is greater than the density of water. Given the density of Au is 19.3 g/cm3, determine the mass of gold (in grams) in an ingot with the dimensions of 10.0 in x 4.00 in x 3.00 in. correct answer: 3.80 x 104 The distance between the two hydrogen atoms in a molecule of water is 0.172 m. Express this distance in scientific notation. correct answer: 1.72 x 10-10 m How many grams are in 1.48 x 107 μg? co