Homework Answers
The Density of Water
Determine the mass of a clean and dry, 100-ml graduated cylinder using the electronic balance, then pour 50 mL of distilled water into it and weigh. Measure the volume of water in the cylinder. Now calculate the density of water, dividing mass of water by volume of water.
The density of water = mass of water / volume of water
1) If a student is charged with measuring the length of lab benchtop. He/she should take the measurement at least 3-4 times to obtain accuracy.
For example, if a student measures the length of table four times and obtain following data 46 cm, 46.1 cm, 45.9 cm and 46.1 cm his data is precise having only 2% variance between the highest number and the lowest number.
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What is the best way to measure the density of water? If a student is charged...
please help with no 3,4,5 and 6 Thanks 1. What is standard error? Measure of statistical...
please help with no 3,4,5 and 6
Thanks
1. What is standard error? Measure of statistical accuracy of an estimate, equal to the standard deviation of the theorental distribution of a large populanon of such estimates 2. What calculation is used to describe the variation in measurements. 3. In experiment 3.2. You will be measuring out 40ml of volume. How many times will you measure 40 ml? 4. What is the difference for each time you measure out 40ml? In...
1. A student makes several measurements of the density of an unknown mineral sample. She then...
1. A student makes several measurements of the density of an unknown mineral sample. She then reports the average value of these measurements. The number of significant figures she uses in her result should be a measure of its A) accuracy. B precision C) systematic error. D) determinate error. E) human error. The temperature of a gas sample isproperty. 2. A) intensive B) extensive 3. Which one of the following is a "substance" in the chemical sense as used in...
4. (5 points) Three students make measurements of the length of a 1.50 meter rod. Each student reports an uncertainty e...
4. (5 points) Three students make measurements of the length of a 1.50 meter rod. Each student reports an uncertainty estimate representing an independent random error applicable to the measurement Alice A single measurement using a 2.0 meter long tape measure, to within +2 mm. Bob: Two measurements using a wooden meter stick, each to within t2 mm, which he adds together Christina: Two measurements using a machinist's meter ruler, each to within + mm, which she adds together. The...
Name: Date: CVEN207-Sures2019 In today's laboratory we will learn measurement technigues that will be used in...
Name: Date: CVEN207-Sures2019 In today's laboratory we will learn measurement technigues that will be used in laboratory over the routine calculations. Lastly we will look at how uncertainty relates to measurement, precision and Laboratory # 2 : Measurement and UncertaintyY Introduction semester. We will also examine the use of dimensional analysis and significant figures in performing accuracy. Precision Scientific measurements should be as precise as possible: this means that every measurement will include one uncertain or estimated digit. The number...
1. What is a measurement? Give your own definition of what constitutes a measurement based on...
1. What is a measurement? Give your own definition of what constitutes a measurement based on your previous courses with lab components (biology, chemistry, physics) 2. Two engineers must measure the distance between the McGill metro station to the athletic centre to build an underground tunnel. One engineer finds that the distance is 9134 ± 5m while the other finds that the distance is 9150 ± 20m. In what ways can they compare their measurements? Do their measurements agree? Explain....
Student name: Student ID#: Give the best answer for each of the following questions, Choose only ONE answer for ea...
Student name: Student ID#: Give the best answer for each of the following questions, Choose only ONE answer for each question and write clearly 1), the identities of the substances involved are the same as their identities before the change a-Physical change b-Chemical change - State of matter d-Mixture 2) This kind of separation is based on the state of matter and it is used to separate a heterogeneous mixture like coffee a- Filtration b-distillation C-cooking d-extraction 3) Which of...
1. What do volumetric glassware measure? What types of volumetric glassware will you be using in...
1. What do volumetric glassware measure? What types of volumetric glassware will you be using in this experiment? 2. What is density? How is it calculated? 3.Define meniscus. State how you use the meniscus in making volumetric measurements. Draw a sketch of a meniscus for water in a graduated cylinder. 4. Define accuracy and precision. Explain what the “reliability of a measurement” means. (These concepts can be found in Chapter 1 of your text.) 5. Why will you calculate accurate...
ASSIGNMENT QUESTIONS AND PRORLEMS FOR TOPIC 3 ASSIGNMENT QUESTIONS AND PROBLEMS FOR TOPIC 3 3.1A student...
ASSIGNMENT QUESTIONS AND PRORLEMS FOR TOPIC 3 ASSIGNMENT QUESTIONS AND PROBLEMS FOR TOPIC 3 3.1A student was supplied with a stop watch, two metre rules and a simple pendulum suspended from a ceiling and was asked to measure the height of the ceiling indirectly, He set the pendulum swinging through a small angle and measured the period of oscillation for different lengths of the pendulum. Since he was unabie to measure the length of the pendulum directly, he measured the...
yBLEMS FOR TOPIC 3 ASSIGNMENT QUESTIONS AND PROBLEMS FOR TOPIC 3.1 A student was supplied with a stop watch, two metre rules and a simole pendulum suspended from a ceiling and was asked to measure...
yBLEMS FOR TOPIC 3 ASSIGNMENT QUESTIONS AND PROBLEMS FOR TOPIC 3.1 A student was supplied with a stop watch, two metre rules and a simole pendulum suspended from a ceiling and was asked to measure the heihple the ceiling indirectly. He set the pendulum swinging through a small angle and measured the period of oscillation for different lengths of the Since he was unable to measure the length of the pendulum direer measured the height of the centre of the...
23.40245 What's the proper way to report (write) the reading shown in the analytical balance shown in t...
23.40245 What's the proper way to report (write) the reading shown in the analytical balance shown in the figure A) 23.402 B) 23.40245 C) 23.4025 D) 23.4 E) Any of the answers A-D are valid answers. How would you notate (write) the amount of fluid delivered from the "fill line" of the volumetric pipette shown in the figure, if the following markings are on the pipette: 25 mL +/- .02 mL TD at 25 C A) 25.00 mL B) 25.0...
please help with no 3,4,5 and 6
Thanks
1. What is standard error? Measure of statistical accuracy of an estimate, equal to the standard deviation of the theorental distribution of a large populanon of such estimates 2. What calculation is used to describe the variation in measurements. 3. In experiment 3.2. You will be measuring out 40ml of volume. How many times will you measure 40 ml? 4. What is the difference for each time you measure out 40ml? In...
1. A student makes several measurements of the density of an unknown mineral sample. She then reports the average value of these measurements. The number of significant figures she uses in her result should be a measure of its A) accuracy. B precision C) systematic error. D) determinate error. E) human error. The temperature of a gas sample isproperty. 2. A) intensive B) extensive 3. Which one of the following is a "substance" in the chemical sense as used in...
4. (5 points) Three students make measurements of the length of a 1.50 meter rod. Each student reports an uncertainty estimate representing an independent random error applicable to the measurement Alice A single measurement using a 2.0 meter long tape measure, to within +2 mm. Bob: Two measurements using a wooden meter stick, each to within t2 mm, which he adds together Christina: Two measurements using a machinist's meter ruler, each to within + mm, which she adds together. The...
Name: Date: CVEN207-Sures2019 In today's laboratory we will learn measurement technigues that will be used in laboratory over the routine calculations. Lastly we will look at how uncertainty relates to measurement, precision and Laboratory # 2 : Measurement and UncertaintyY Introduction semester. We will also examine the use of dimensional analysis and significant figures in performing accuracy. Precision Scientific measurements should be as precise as possible: this means that every measurement will include one uncertain or estimated digit. The number...
1. What is a measurement? Give your own definition of what constitutes a measurement based on your previous courses with lab components (biology, chemistry, physics) 2. Two engineers must measure the distance between the McGill metro station to the athletic centre to build an underground tunnel. One engineer finds that the distance is 9134 ± 5m while the other finds that the distance is 9150 ± 20m. In what ways can they compare their measurements? Do their measurements agree? Explain....
Student name: Student ID#: Give the best answer for each of the following questions, Choose only ONE answer for each question and write clearly 1), the identities of the substances involved are the same as their identities before the change a-Physical change b-Chemical change - State of matter d-Mixture 2) This kind of separation is based on the state of matter and it is used to separate a heterogeneous mixture like coffee a- Filtration b-distillation C-cooking d-extraction 3) Which of...
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yBLEMS FOR TOPIC 3 ASSIGNMENT QUESTIONS AND PROBLEMS FOR TOPIC 3.1 A student was supplied with a stop watch, two metre rules and a simole pendulum suspended from a ceiling and was asked to measure the heihple the ceiling indirectly. He set the pendulum swinging through a small angle and measured the period of oscillation for different lengths of the Since he was unable to measure the length of the pendulum direer measured the height of the centre of the...
23.40245 What's the proper way to report (write) the reading shown in the analytical balance shown in the figure A) 23.402 B) 23.40245 C) 23.4025 D) 23.4 E) Any of the answers A-D are valid answers. How would you notate (write) the amount of fluid delivered from the "fill line" of the volumetric pipette shown in the figure, if the following markings are on the pipette: 25 mL +/- .02 mL TD at 25 C A) 25.00 mL B) 25.0...
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