CHEM 100: Practice Exam Complete Questions With Accurate Answers

Determine the number of significant figures in the measurement. Enter a NUMERICAL answer. 0.0350 grams - correct answers 3 Determine the number of significant figures in the measurement. Enter a NUMERICAL answer. 2.014 x 10⁻² meters - correct answers 4 Round 7.9445 to four (4) significant figures. - correct answers 7.946 Round 7.9445 to one significant figure - correct answers 8 Round 0.090625 to two significant figures. - correct answers 0.091 Choose all that apply regarding NO₂: - Pure substance - Element - Compound - Atom - Homogenous mixture - Heterogenous mixture - correct answers pure substance, compound, heterogenous mixture Choose all that apply regarding N₂: - Pure substance - Element - Compound - Atom - Homogenous mixture - Heterogenous mixture - correct answers a,b,d Refer to the image and choose the correct description. - Mixture of a compound and an element - Mixture of 2 compounds - Mixture of 2 elements - Pure substance - correct answers c How many grams are there in 65.5mg? (1000mg = 1g). Report your numerical answer with units with no space between the number and unit. For example: 1.24g - correct answers 0.0655g