Chemistry Cumulative REVIEW Questions and Correct Answers

Determine density. Write the formula. What is the density of an object that has a mass 40.0g and a volume of 8.0mL? Show your work. Answer: D=m/v (mass/volume) 40/8= 5g/mL What is the density of water? Would the object in #1 float or sink in water? Explain. Answer: The density of water is 1g/mL the object in #1 would sink because an object with a density less than 1 g/cm3 will float What are two ways that mixtures are classified? Give an example of each. Answer: heterogeneous: Oil & water homogeneous : sugar water What are two ways that substances are classified? Give an example of each. Answer: Element: water Compound: carbon dioxide What distinguishes a substance from a mixture? a. Substances are compounds, and mixtures are not. b. Mixtures are groupings of elements, and compounds are not. c. Samples of the same substance can have different intensive properties. d. Mixtures can be separated physically, while compounds cannot. Answer: Mixtures can be separated physically, while compounds cannot. Define physical property and g