3) Let's say you are a forensic chemist and need to determine the identity of an...

3) Let's say you are a forensic chemist and need to determine the identity of an unknown metal with some certainty, not just estimate it. Name at least one source of experimental uncertainty, and discuss how it can be reduced.

Solutions

Expert Solution

The identity of an unknown metal can be established by estimating its density.

1) weigh the unknown metal = 'm' g

2) measure a certain volume of water = V_water ml

3) Put the metal in the water and measure the total volume = V_total

V_total = V_water + V_metal

therefore, V_metal = V_total - V_water

4) Now, we known the mass of metal and the volume of metal from which the density can be calculated.

Density (metal) = m / V_metal

The likely source of error could be an incorrect value of the volume. This could arise if the cylinder or beaker into which the water or metal was added already had some some traces of water. If this was the case, the volume would higher than what it should be. However, one can overcome this by ensuring that the labware is competely dry.

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

Let's say that you are an athletic trainer, and you are interested in the impact of...

Let's say that you are an athletic trainer, and you are interested in the impact of different types of exercise upon resting heart beats. You run a study comparing people who do yoga, pilates, and runners. You have collected the data and you are ready to analyze it via ANOVA. Using JASP, conduct your ANOVA. Then complete the fill-in-the-blank sentence below. HBM Sport 59 Yoga 60 Yoga 60 Yoga 55 Yoga 61 Yoga 59 Yoga 58 Yoga 60 Yoga 60...

1. Let's say that you are looking at a table with output and cost data for...

1. Let's say that you are looking at a table with output and cost data for a firm and you observe the following: At a quantity of 10 units, the firm's marginal cost and marginal revenue both equal $.75. At a quantity of 18 units, the firm's marginal cost reaches its lowest point at $.35. At a quantity of 26 units, the firm's average total cost reaches a minimum of $.50. At a quantity of 28 units, the firm's marginal...

Let's say that you are looking to invest in two stocks A and B. Stock A...

Let's say that you are looking to invest in two stocks A and B. Stock A has a beta of 1.19 and based on your best estimates is expected to have a return of 13%. Stock B has a beta of 1.61 and is expected to earn 7%. If the risk-free rate is currently 2% and the expected return on the market is 12%, which stock(s) should you invest in, if any? Work by hand no financial calculator

So let's say you have a beaker that contains 6.02g ammonium chloride and to this you...

So let's say you have a beaker that contains 6.02g ammonium chloride and to this you add 300.0mL of 0.450 M calcium hydroxide according to the following chemical equation: Ca(OH)2 (aq)+2NH4Cl(s) ---> CaCl2(aq)+2H2O(l)+2NH3 A) Draw the beaker at the end of the reaction - what would e in the beaker and/or around it. What would the products look like on a molecular/atom/ion level? B) How many moles of each reactant does the reaction start with? C)At STP, how many...

Thinking of a pandemic and how it changes everything, let's say that you have the money...

Thinking of a pandemic and how it changes everything, let's say that you have the money to invest, which type of companies do you invest on and which do you avoid? What are the characteristics of a company that may thrive during a pandemic?

[5] Let's say you want to evaluate an investment with an initial investment of $ 724,000,...

[5] Let's say you want to evaluate an investment with an initial investment of $ 724,000, a lifetime of 8 years, and a zero-residual value. Investment costs are depreciated by the straight-line depreciation method over the life of the investment. The annual sales volume is estimated at 90,000 units, with a price of $ 43 per unit, a variable cost of $ 29 per unit, and an annual fixed cost of $ 780,000. The tax rate is 35% and the...

For a gain on sale of land, how would you book the transaction? Let's say the...

For a gain on sale of land, how would you book the transaction? Let's say the property was purchased for 100,000 (no depreciation because it's land) and sold 3 years later for $175,000. Please show the journal entries upon acquisition and disposition. Would this be a capital gain or ordinary gain? Do you have enough facts to answer if it would be capital or ordinary?

Let's say you have a bag of 100 marbles. There are an equal number of five...

Let's say you have a bag of 100 marbles. There are an equal number of five different colors. You are curious to know what the probability would be if you dipped your hand in and grabbed out 5 of the same color marble. In this scenario, the underlying success rate = _______. **Please show work!

Let's say you are going to titrate a 200 ml solution of 0.5M KOH with a...

Let's say you are going to titrate a 200 ml solution of 0.5M KOH with a 0.1M solution of HNO3. a) What is the initial pH? b) Determine the pH when 300ml, 500ml, 975ml, 1000ml, 1005 ml, and 2000ml of the acid are added to the initial solution. c) Sketch a rough titration curve.

Determine whether or not you believe the forensic processes taken by an investigator on a Macintosh...

Determine whether or not you believe the forensic processes taken by an investigator on a Macintosh system is different from that on a Windows or Linux system. Determine which type of system you would prefer to utilize if you were leading an investigation. Additionally, decide whether or not the specifics of the investigation would have a determination on your choice and why or why not.

Subjects