(a)
Interpretation:
The simple average mass of the marbles is to be calculated.
Concept introduction:
The simple average mass is calculated by adding two masses together and divide by
(b)
Interpretation:
The weighted average mass of the marbles is to be calculated
Concept introduction:
The simple average mass is calculated by adding two masses together and divide by
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Chapter 4 Solutions
Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
- According to the Official Rules of Baseball, a baseball must have a circumference not more than 9.25 in or less than 9.00 in and a mass not more than 5.25 oz or less than 5.00 oz. What range of densities can a baseball be expected to have? Express this range as a single number with an accompanying uncertainty limit.arrow_forwardThe density of an irregularly shaped object was determined as follows. The mass of the object was found to be 28.90 g 0.03 g. A graduated cylinder was partially filled with water. The reading of the level of the water was 6.4 cm3 0.1 cm3. The object was dropped in the cylinder, and the level of the water rose to 9.8 cm3 0.1 cm3. What is the density of the object with appropriate error limits? (See Appendix 1.5.)arrow_forwardA student was given two metal cubes that looked similar. One was 1.05 cm on an edge and had a mass of 14.32 grams; the other was 2.66 cm on a side and had a mass of 215.3 grams. How can the student determine if these two cubes of metal are the same material using only the data given?arrow_forward
- The mass of one atom or molecule of a substance is given in atomic mass units, also called Daltons (abbreviated D or Da). Thus one molecule of water has a mass of 18.015 atomic mass units, or 18.015 Daltons. The atomic mass unit is defined such that one mole of water weighs 18.015 g. Suppose a protein has a mass of 64 192 Daltons (or 64.192 kDa). What would be the mass of one mole of this protein? O A. A protein of 64 192 Da has a molar mass of 3.866 x 1028 g/mol. B. A protein of 64 192 Da has a molar mass of 1.0 g/mol. C. A protein of 64 192 Da has a molar mass of 18.015 g/mol. D. A protein of 64 192 Da has a molar mass of 64.192 g/mol. E. This question can't be answered without knowing the number of atoms in the protein. F. A protein of 64 192 Da has a molar mass of 6.4192 x 10-2 g/mol. G. A protein of 64 192 Da has a molar mass of 3.866 x 1025 g/mol. H. A protein of 64 192 Da has a molar mass of 64 192 g/mol.arrow_forwardA proton has a radius of approximately 1.0×10−13 cmcm and a mass of 1.7×10−24 gg. Determine the density of a proton. For a sphere V=(43)πr3V=(43)πr3.arrow_forwardWrite the following metals using Roman numeral notation. Then, explain why the Roman numeral differs for these metals. . . Co²+ Fe₂O3 Answer in complete sentences. H Normal Enter your answer here √x C 2 Ix BIUS X 300 worarrow_forward
- A researcher would like to determine whether there is any relationship between students’ grades and where they choose to sit in the classroom. Specifically, the researcher suspects that the better students choose to sit in the front of the room. To test this hypothesis, the researcher asks her colleagues to help identify a sample of n = 100 students who all sit in the front row in at least one class. At the end of the semester, the grades are obtained for these students and the average grade point average is M = 3.25. For the same semester, the average grade point average for the entire college is μ = 2.95 with σ = 1.10. Use a two-tailed test with α = .01 to determine whether students who sit in the front of the classroom have significantly different grade point averages than other students.NOTICE that you are asked to use α = .01! A) sig., p<.01 B) N.S. ("not significant"), p>.01 C) sig., p>.01 D) N.S., p<.01arrow_forwardMass and weight are related via the equation W=mg on Earth. Mass is how much matter an object has and weight of mass under a gravitational field (on Earth g=98.0 m/s) Suppose you go to and unknown planet-X where the gravitational field on the planet is g'=23.15 m/s. Will a metal have a higher, lower or the same density on planet -X when compared to Earth. Assume the Volume of the metal doesn't changearrow_forwardI am told that when determining the number of significant figures, if the decimal place is absent, then you start counting from the first nonzero number on the right side and continue counting to the left until you reach the last digit. However, if the decimal place is present, start counting the first nonzero number from the left and continue counting to the right until the final digit has been reached. For example, the number 50 only has two significant figures, while the number 50.00 has four significant figures. However, how does the number 50 have two significant figures? If I have to start countingfrom the right because of the absence of a decimal place, and I have to begin with the first non zero number, I would have to start from 5 and there is nowhere to count further to the left. How does the number 50 have two significant figures?arrow_forward
- 1) Perform the indicated mathematical operations. State the uncertainty of the final answer as ± 1-digit variation in the least significant digit. (remember that the last significant digit's place holder is the most uncertain digit!) 7.700 x 2.1 = uncertainty: 2.132 + 17 + 4.04 = uncertainty: 27000 + 500 = uncertainty: 30.0 x 50.0 = uncertainty: (9.6 × 107)(1.24 × 10³)_ uncertainty: 1.897 x 102arrow_forwardMg(s)+N2(g)→Mg3N2(s)Mg(s)+N2(g)→Mg3N2(s) Express your answers as integers separated by commas.arrow_forward1.) A dense plastic-like shape has a mass of 42.985 g and has a volume of 41.96 mL. What is the density of the substance? 2.) Another plastic-like piece has a mass of 65.389 grams and displaces 53.652 grams of water (measured at 24.6 ⁰C). Is this piece likely to be composed of the same material as the sample in problem 1? Explain using the Claim-Evidence-Reasoning process.arrow_forward
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