question archive 1) Determine density of sample
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1) Determine density of sample. (show your work WITH units)
Assume 1.5 grams of a metal and an 8 mL change in volume when the metal is placed in water.
2.Identify your sample by comparing the density of your sample with known
densities. This can be searched in your textbook or online.
3. Using the procedure in this experiment explain how the measured density of a substance is affected for each of the following:
4. Describe 3 or 4 other potential sources of error that may affect your results and explain why that will change the calculated answer.
**Write each source and explanation in a separate paragraph, using complete sentences.**
5.Explain the process that allowed you to take measurements of mass and volume and determine the identity of the unknown metal.
1. Density = 0.1875 g/mL or g/cm3
2. Titanium
3.1 Volume can affect the density
3.2 Air bubbles can lower down actual density
4. Temperature, Pressure, Materials used in liquid measurement
5. Mass and volume can be measured by using intruments such as analytical balance and graduated cylinders while the density is computed using a formula
Step-by-step explanation
1. Density = Mass/Volume
= 1.5 g/8 mL
= 0.1875 g/mL
2. The density given may be of a styrofoam or titanium but since it is a metal we consider titanium as it has a density of 0.2 g/mL
3.1 The volume of water directly affects the density of an element. If an instance where the water splashes out of the cylinder once the sample is introduced, it may show inaccuracy in density which nay result in a lower value.
3.2 Air bubbles adhered to a solid sample take up space which makes the density of the sample decrease and also affect the volume measurement.
These instances propose that a sample that sinks in water is preferred rather than a floating one.
4. a. Temperature - Density varies with temperature in a way that the higher the temperature decreases the density of the sample given that heat expands the molecules of the sample. In contrast, lower temperatures increase density as the sample becomes condensed. This is a potential source of error because density may vary from one temperature to another.
4.b. Pressure - Density has a directly proportional relationship with pressure. Hence, the higher the pressure, the higher the density. This can be a potential source of error when pressure is not maintained at 1 atm because 1 atm pressure leads us to an accuracy in the determination of the density of a material.
4.c. Measuring materials - The measurement of the mass of the sample and the volume of the liquid may be affected depending on the instrument used. In measuring a sample, kitchen scales do not provide accurate measurements whereas analytical balancers provide those that is why it is preferred. Kitchen scales are used for rough estimation on the mass of the material. In addition, beakers and graduated cylinders are often used in measuring the volume of a liquid. Graduation marks of beakers are often distant with each other which gives us an estimated volume of a liquid whereas the marks in a graduated cylinder is more accurate in measuring the actual volume of a liquid.
5. As mentioned, the mass of the sample can be determined by using an analytical balancer which provides us an accurate mass of the sample whereas a graduated cylinder is used in measuring the volume of a liquid. Lastly, the density was calculated by using the formula discovered by Archimedes, D= M/V or Density = Mass over Volume.