When designing an experiment it is best to avoid using a result that is the small difference between two large measured quantities. In terms of uncertainties in measurement why is this good advice?

Q: One important observation that supporters of the phlogiston theory had trouble explaining was that…

A: Lavoisier, a French chemist, conducted an experiment in which he decomposed the mercury calx into…

Q: 3. Define the following symbols used for this experiment. a) VR,start b) WB c) k'red d) R

A: 3. The given terms in this question are related to the chromatographic separation of molecules in a…

Q: What is one example of systematic error that can occur in an experiment and one example of random…

A: The difference between true value and an measured value of an experiment is known as errors. If any…

Q: What was an example of a case where you used the scientific method to solve a real-life issue?

A: Problem: Do plants need food to grow? Hypothesis: If the plant is given more food it will grow…

Q: In a laboratory, a student calibrates a 25 mL pipette to use throughout a semester. She accidentally…

A: Generally this breakage happens. So if this happened she should pay the fine according to…

Q: What are the typical three components of paint? * binders,liquids, and pigments. A student needs…

A: Three typical components of paint: Paints generally have four main components. They are: Pigments,…

Q: Why is it important to always include units when recording measurements?

A: It is important to always include units when recording measurements.

Q: (b) A sampling plan is necessary to ensure that a laboratory sample is truly a representative of the…

A: Sampling plan is a term widely used in research studies that provide an outline on the basis of…

Q: Can a set of data be accurate but not precise?

A: Yes, to some extent. This direction is more involved. Let’s use the example of direction (1) but…

Q: When astronomers observe distant galaxies, they can tell that most of them are moving away from one…

A:

Q: What are significant numbers and why are they important in analytical chemistry?

A: Significant numbers are the digit which denotes the count of non- zero digit in a particular number…

Q: What is the numerical value of a conversion factor ?why must this be true ?

A: Numerical value of a conversion factor is answered in the next step.

Q: An empty sample bottle that weighs 27.32 g has a capacity of 19.58 mL. A piece of metal is placed…

A: Given: Mass of empty bottle = 27.32 g Volume of empty bottle = 19.58 mL Mass of empty bottle and…

Q: What is a conversion factor? Give an example of a conversion factor

A: Mathematical tools are used for the measurement of various values.

Q: Why should weighing or any other measurement data, be recorded immediately in your laboratory manual…

A: A question based on quantitative analysis, which is to be accomplished.

Q: The average adult heart pumps about 84. mL/s of blood at 72 beats per minute. Suppose you need to…

A: The pumping efficiency of heart is 84 mL/s means it takes 1 second to circulate or pump 84 mL of…

Q: Why are repeated trials of the same measurement desirable

A: Repeated trials means measurement of same  data repeatedly.

Q: 0.356=44.032.0x+88.046.0(0.220−x) This question is for chemistry. I'm not sure how to…

A: In this question, we have to solve the given equation to find the value of x.…

Q: measurements of mass and volume so important in chemistry

A: Concept Introduction :   Chemistry : the branch of science which deals with the substances of which…

Q: How does the uncertainty in measurements affects the outcome of an experiment?

A: Error has to do with uncertainty in measurements that nothing can be done about. If a measurement is…

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: Statement a is correct as it includes general steps in quantitative analysis.  Statement b is…

Q: What is the meaning of the number of digits reported in a measured quantity?

A:

Q: Based on your experience in this experiment, briefly discuss the relative precision permitted by a…

A:

Q: coffee (with milk) a. suspension b. solution c. an element d. heterogeneous mixture

A: Coffee on dissolving in milk forms a homogeneous mixture because the particles of coffee…

Q: Is the ink inside of a pen a pure substance or a mixture? Explain your answer using scientific…

A: a pure substance is made up of only one type of molecule. But mixture is made up of more then one…

Q: 8) The vessel to be weighed should be placed of the pan. (off to the side, or in the center) 9)…

A: 8. The vessel to be weighed should be placed in the center of the pan.  For proper weighing, vessel…

Q: A chemistry student is investigating how particle sizeaffects the rate of dissolving. In her…

A: Like dissolves like .Sugar made of sucrose is a polar molecule  and so is water. Sugar dissolves in…

Q: 1. Complete the following statement: Data that have a large systematic error can still be  a.…

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: In order to find the density of a solution of unknown density, 10 mL of solution was drawn into a…

A: Density = mass / volume.

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: Statement a is correct because it include correct general steps in quantitative analysis.

Q: What were the main results found in this experiment? Include both quantitative results (i.e.…

A:

Q: 1. In mL what is the volume of liquid in the burette pictured on the right (to the correct number of…

A: Three questions based on quantitative analysis, which are to be accomplished.

Q: Which of the following is a good practice in weighing solid samples? A Do not return the mass…

A: For accurate and pure weighing of solid samples Use weighing paper, a watch glass, a beaker, or some…

Q: A chemistry instructor provides each student with 8 test tubes at the beginning of the school year.…

A:

Q: Discuss an example of a case where you used the scientific method to solve a real-life issue.

A: The scientific method is a systematic way of studying a problem. The use of this method is not…

Q: 6. What is the difference between ACCURACY and PRECISION?

A: Accuracy:The measurement of how close the calculated value to the standard value is said to be…

Q: Why do we use quotation marks around the word true in the statement that accuracy refers to how…

A:

Q: A graduated cylinder is filled to the 40.00−mL mark with a mineral oil. The masses of the cylinder…

A: Density of oil can be determined from experiment 1 as follows,

Q: A blood sample of 2.81 milliliters is collected from a patient to be anaylzed for a platelet count.…

A: We know that,1 Kg = 1000g1 L = 103 milli L⇒ 1ml = 11000LGiven,Platelet Density of human blood = 1.04…

Q: c) A metal sample has a mass of 7.56 g. The sample is placed into a graduated cylinder previously…

A: Given :  Mass of metal=7.56 g Initial volume=20.00 mL The final volume of water= 21.68 mL Volume of…

Q: Which of the following is NOT true about constant weighing in the experiment? It involves a cycle of…

A:

Q: Which of the following is a best practice in weighing solid samples? (A Do not return the mass…

A: To identify: The best practice in weighing solid samples.

Q: 1. Why are the calibration marks on laboratory beakers taken only to be an approximate guide to…

A: Calibration marks on the laboratory beakers and the volumetric flasks are present to accurately…

Q: "Systematic errors typically affect accuracy whilst random errors generally affect precision”. Do…

A: Accuracy means if we are performing any experiment and if we get a true value(expected value) than…

Q: Which of the following is a best practice in weighing solid samples? A Place chemicals directly on…

A: For the majority of everyday objects, a balance is used to determine an object's mass. The balance…

Q: What is the importance of measurements in experimental science?

A: Measurement is perhaps one of the most fundamental concepts in science.

Q: precise. You work in a chemistry lab. The chemical test you do is based on a color change when two…

A: The color of the reference standard is yellow The color of the first 5 samples is also yellow. The…

Q: The density of lead is 11.34 g/mL and the approximate density of water is 1 g/mL. If given 1 Kg of…

A: Given: Density of lead: 11.34 g/mL, mass of lead: 1 kg Density of water: 1 g/mL, mass of water: 1 kg…

Q: Why should repetitive measurements always be made, if possible, when performing an experiment.…

A: Repetitive measurements are nothing taking more than trial for single measurement. We have to…

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: Statement a is correct as general steps is quantitative analysis includes all given steps.

Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.