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[GET] Chapter Test B Measurements And Calculations Answers | latest
Dividing the distance by the speed and then multiplying by the number of meters in a kilometer will result in units of a. In which of the following measurements are all the zeros considered to be nonsignificant figures? If some measurements agree...[FREE] Chapter Test B Measurements And Calculations Answers | updated!
A n is something that has magnitude, size, or amount. Derived units are combinations of. To change from one unit to another, you must first determine the appropriate. Convert the following measurements. Write your answer on the line to How does a...
- In a liquid, particles are close together but can flow around one another. In a gas, particles are at great distances from one another, compared to the particles of liquids and solids. The composition of a pure substance is the same throughout and does not vary from sample to sample. Pure substances include elements and compounds. A mixture contains more than one substance and can vary in composition from one sample to another and sometimes within different parts of the same sample. Although energy can be absorbed or released in a change, it is not destroyed or created. It simply takes a different form.
- Homogeneous mixtures are uniform in composition; heterogeneous mixtures are not. An element cannot be broken down, but water can be decomposed into hydrogen and oxygen by passing an electrical current through it electrolysis. SI base units A theory is a broad generalization that explains a body of facts or phenomena. Mass is a measure of the quantity of matter. Weight is a measure of the gravitational pull on matter. Mass does not depend on gravitational attraction.
- Models are visual, verbal, or mathematical representations. They are used to explain how phenomena occur or how data or events are related. The graph of two quantities that are directly proportional is a straight line through the origin. The graph of two quantities that are inversely proportional is a hyperbola. Percentage error experimental value accepted value accepted value 1. All atoms of the same element have the same mass; atoms cannot be subdivided. Modern Chemistry Answer Key.
- To use standard laboratory measurement devices to measure length, volume and mass amounts. To use these measurements to determine the areas of shapes and volumes To determine the density of water. To determine the density of a solid and use this to determine further quantities. To determine the density of aluminum applying the technique of water displacement and use that value to determine the thickness of a piece of aluminum foil. Chemistry is the study of matter. Our understanding of chemical processes thus depends on our ability to acquire accurate information about matter. Often, this information is quantitative, in the form of measurements. In this lab, you will be introduced to some common measuring devices, and learn how to use them to obtain correct measurements, each with correct precision. A metric ruler will be used to measure length in centimeters cm. All measuring devices are subject to error, making it impossible to obtain exact measurements.
- Students will record all the digits of the measurement using the markings that we know exactly and one further digit that we estimate and call uncertain. The uncertain digit is our best estimate using the smallest unit of measurement given and estimating between two of these values. These digits are collectively referred to as significant figures. Note, the electronic balance is designed to register these values and the student should only record the value displayed. When making measurements, it is important to be as accurate and precise as possible. Accuracy is a measure of how close an experimental measurement is to the true, accepted value. Precision refers to how close repeated measurements using the same device are to each other. The correct reading is 1. The first 2 digits 1. The last digit 1. You may have instead estimated it as 1.
- The measuring devices used in this lab may have different scale graduations than the ones shown Precision is basically how many significant figures you have in your measurement. To find the precision, you basically take the smallest unit on your measuring device, and add a decimal place the uncertain digit. Note In general, the more decimal places provided by a device, the more precise the measurement will be. Measurements obtained in lab will often be used in subsequent calculations to obtain other values of interest. Thus, it is important to consider the number of significant figures that should be recorded for such calculated values.
- If multiplying or dividing measured values, the result should be reported with the lowest number of significant figures used in the calculation. If adding or subtracting measured values, the result should be reported with the lowest number of decimal places used in the calculation. Calculate his velocity or speed. If Volume is the amount of space occupied by matter. An extensive property is one that is dependent on the amount of matter present. Volume is an extensive property. The volume of a liquid can be directly measured with specialized glassware, typically in units of milliliters mL or liters L.
Chapter 2 Measurements And Calculations Holt Mcdougal Modern Chemistry Answers Pdf
In this lab, a beaker, two graduated cylinders and a burette will be used to measure liquid volumes, and their precision will be compared. Note that when measuring liquid volumes, it is important to read the graduated scale from the lowest point of the curved surface of the liquid, known as the liquid meniscus. When read from the lowest point of the meniscus, the correct volume reading is The first 2 digits The last digit Even though it is a zero, it is significant and must be recorded. The volume of a solid must be measured indirectly based on its shape. For regularly shaped solids, such as a cube, sphere, cylinder, or cone, the volume can be calculated from its measured dimensions length, width, height, diameter by using an appropriate equation.- The units for solid volumes are typically cubic centimeters cm3 or cubic meters m3. Density is defined as the mass per unit volume of a substance. Density is a physical property of matter. Physical properties can be measured without changing the chemical identity of the substance. Since pure substances have unique density values, measuring the density of a substance can help identify that substance. Density is also an intensive property. An intensive property is one that is independent of the amount of matter present. For example, the density of a gold coin and a gold statue are the same, even though the gold statue consists of the greater quantity of gold. Procedure Materials and Equipment Metric ruler, shape sheet, electronic balance, triple-beam balance, mL Erlenmeyer flask, mL beaker, sugar, mL beaker, scoopula, burette, mL and mL graduated cylinders, mL beaker, wooden blocks, aluminum pellets, aluminum foil, electronic balance, distilled water.
Stoichiometry Calculations Using Enthalpy – Introductory Chemistry – 1st Canadian Edition
Safety Be careful when adding the aluminum to your graduated cylinder, as the glass could break. Record the ID code on your report form. Measure the dimensions of the two geometric shapes: length and width of the rectangle, and the diameter of the circle. Record these values on your lab report. When finished, return the ruler and sheet to the front bench. Use the triple-beam balance to determine the mass of this flask. Use the electronic balance in the weigh room to determine the mass of the same Erlenmeyer flask. Be sure to record your measured masses on your lab report. Weighing by Difference Obtain a mL beaker from your locker. Use the electronic balance in the weigh room to determine the mass of this beaker.Chapter Test B. Chapter: Measurements And Calculations - PDF Free Download
Add two spoonfuls of sugar to this beaker, using your scoopula. Do not do this over the balance! Determine the new combined mass of both the beaker and the sugar. Be sure to use the same electronic balance as before. When finished, dispose the used sugar in the sink. Use your two measurements to calculate the mass of sugar only by difference. Part C: Volumes of Liquids and Solids Volumes of Liquids At the front bench, you will find a burette, mL graduated cylinder, mL graduated cylinder and mL beaker, each filled with a certain quantity of water. Measure the volume of water in each. Remember to read the volume at the bottom of the meniscus. Volume of a Regularly Shaped Solid Borrow a wooden block or cylinder and ruler from the front bench.Big Ideas Math Geometry Answers Chapter 5 Congruent Triangles
Measure the dimensions of the block. If it is a cube or a rectangular box, measure its length, width and height. If it is a cylinder or cone, measure its height and the diameter of its circular base. Return the block or cylinder and ruler to the front bench when finished. Part D: The Density of Water Using the electronic balance in the weigh room, determine the mass of a clean, dry, mL graduated cylinder.- Pour mL of distilled water into the graduated cylinder and weigh. Make sure that the outside of the graduated cylinder is dry before placing it on the electronic balance. Measure the liquid volume in the cylinder Use the mass and volume to calculate the density of water. Part E: The Density of Aluminum and the Thickness of Foil Density of Aluminum Using the electronic balance in the weigh room to determine the mass of a clean, dry, small beaker. Obtain aluminum pellets from the front bench. Transfer pellets to the beaker weighed in the previous step, and measure the mass of the beaker and pellets together. Pour mL of water into your mL graduated cylinder. Precisely measure this volume. Carefully add all the aluminum pellets to the water, making sure not to lose any water to splashing.
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Also make sure that the pellets are all completely immersed in the water. Measure the new volume of the water plus the pellets. When finished, retrieve and dry the aluminum pellets and return them to the front bench. Analysis: Use your measured mass and volume obtained via water displacement of the aluminum pellets to calculate the density of aluminum. The Thickness of Aluminum Foil Borrow a rectangular piece of aluminum foil and ruler from the front bench. Use the ruler to measure the length and width of the piece of foil. Fold the foil up into a small square and measure its mass using the electronic balance in the weigh room. When finished, return the foil and ruler to the front bench. Analysis: Use these measurements along with the density of aluminum to calculate the thickness of the foil.Measurement And Calculation Test And Key | Teaching Resources
Which sample is better for making an estimate? Sample B -A random sample of pencils from 1 machines is better than Sample A — A random sample of pencils from 20 machines because its gives us the accurate and sufficient data of pencils produced and how many are defective among them. Its a biased sample with correct data. Question You want to know the average height of seventh graders in the United States. Answer: Survey on sample of the seventh graders should be taken. Explanation: Survey on sample of the seventh graders should be taken because the total population in United States is very large and its very difficult to survey on the population. Sample survey will be easy and we can get the information regarding the average height of seventh graders in the United States accurately. You want to know the favorite types of music of students in your homeroom. Answer: Survey on Population should be taken. Explanation: Survey on the population in your homeroom should be taken because its a very small area of some limited people and its better to take than sample survey to know the favorite types of music of students.- Give an example to support your explanation. Answer: Yes, increasing the size of the sample necessarily makes the sample more representative of a population. A representative sample is a group or set chosen from a larger statistical population according to specified characteristics. A random sample is a group or set chosen in a random manner from a larger population. For Example: You want to know the average height of students in the UK. LOGIC A person surveys residents of a town to determine whether a skateboarding ban should be overturned. Describe how the person can conduct the survey so that the sample is biased toward overturning the ban.
- Answer: Yes, the sample is biased toward overturning the ban. Explanation: If the person takes the survey on a skateboarding ban should be overturned from every tenth person living in a town then the person surveys is going to be a biased sample toward overturning the ban because every tenth person wishes to overturning on the ban. There are environmental scientists in your state. Estimate the number of environmental scientists in your state whose favorite way to eliminate waste is recycling. The diagram shows the results. Describe whether the sample can be used to predict the outcome of the election.
- If so, what is your prediction for the number of votes received by the winner assuming that people vote? Answer: Yes, the sample can be used to predict the outcome of the election because it lets us know how voters are going to vote and whose going to be the winner. According to survey candidate A gets 33 out of You ask randomly chosen dog owners in your town how many dogs they own. The results are shown in the table.
- There are dog owners in your town. Estimate the median number of dogs per dog owner in your town. Justify your answer. Estimate the mean number of dogs per dog owner in your town. Explanation: a The median is the middle number in a sorted, ascending or descending, list of numbers and can be more descriptive of that data set than the average. Sixty percent of all seventh graders have visited a planetarium. Design a simulation using packing peanuts. What does choosing a marked peanut represent? Simulate a sample of 25 students by choosing peanuts from the bag, replacing the peanut each time.
Significant Figures – Introductory Chemistry – 1st Canadian Edition
Record the results. Find the percent of students in the sample who have visited a planetarium. Compare this value to the actual percent of all seventh graders who have visited a planetarium. Record the percent in part c from each pair in the class. Use a dot plot to display the data. Describe the variation in the data. Try It Question 1. Use each sample to make an estimate for the number of students in your school who prefer rap music.
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