The correct answer (reported to the proper number of significant figures) to the following is (12.67 + 19.2)(3.99) / (1.36 + 11.366) = . O 9,99851 9.9985 9.999 1.00 x 10! none of the above
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- Is the use of significant figures in each of the following statementsappropriate? (a) The 2005 circulation of National Geographicwas 7,812,564. (b) On July 1, 2005, the populationof Cook County, Illinois, was 5,303,683. (c) In the UnitedStates, 0.621% of the population has the surname Brown.(d) You calculate your grade point average to be 3.87562.Gallium is one of the few metals that can melt at room temperature. Its melting point is 29.76C. If you leave solid gallium in your car on an early summer morning when the temperature is 75.0F, what physical state is the gallium in when you return to your car and the interior car temperature is 85.0F?a sample of sodium carbonate Na2CO3 is being dried. after 1 hour of drying the mass of the sample was 0.337g. after an additional 30 minutes of drying the mass of the sample is 0.333g what is the percent change between the first and second measurement? if to be considered dry two consecutive measurements must have a percent change of less than or equal to plus or minus 1% is the sample dry?
- What is the value of 98 °F in units of °C?Lead is an elementary substance that occurs as a malleable metal with a density of 11.4 g/mL at ambient temperature and pressure. Lead metal can be extracted from a mineral called galena, which contains 86.6%% lead by mass. A particular ore contains 68.5% galena by mass If the lead can be extracted with 92.5%% efficiency, what mass of ore is required to make a lead sphere with a 7.00 cm radius? Express your answer with the appropriate units.1. Evaluate the following expression to the nearest whole number: 6⁶ × 6⁻⁴ 2. Evaluate the following expression to the nearest whole number: log(10⁵) 3. Evaluate the following expression: 18 + (6 - 2)² × 3 4. Express the following sum as a decimal to four significant figures: 1/3 + 3/4 = 5. Solve for the positive value of x that satisfies the following equation: (x + 9)(x - 2) = 60 6. Solve for x to the proper number of significant figures: (0.500)^(x/4.50) = 0.100 7. Solve for x: 14x + 10 = 38 8. Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means? A) Homogeneous mixture B) Chemical compound C) Chemical element D) heterogeneous mixture E) Solution 9. Which one of the following is NOT an example of a compound? A) concrete B) rust (iron oxide) C) carbon dioxide D) ammonia 10. Which one of the following is an example of an element? A) brass B) nickel C) bronze D) sterling silver
- Carry out each calculation and report the answer using the proper number of signifi cant fi gures. a. 53.6 × 0.41c. 65.2 ÷ 12e. 694.2 × 0.2 b. 25.825 − 3.86d. 41.0 + 9.135f. 1,045 − 1.263) Water is placed into a separatory funnel along with one of the following liquids: diethyl ether (density = 0.713g/mL) or dichloromethane (density - 1.33g/mL). The funnel is the opened, and the bottom layer is drained into a beaker. For which combination (water/diethyl ether or water/dichloromethane) would the water end up in the beaker? a) water/diethyl ether b)water/dichloromethaneExpress these non-exponentially, and choose the unit and prefix that works best: 1.9 x 10^-4 l 4 x 10^-3 s 6.5 x 10^-8 g a. 1.9 ml; 4 ms; 65 ng b. 0.19 ml; 4 ms; 65 mg c. 0.19 ml; 40 ms; 65 g d. 0.19 ml; 4 ms; 65 ng e. 0.19 ml; 4 ms; 0.65 g
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