Lab Report Experiment 1 & 2 CHM-101 Amele Takpara Partner: Jessamyn Dupree ------------------------------------------------- Experiment 1 ------------------------------------------------- (Pre-Lab Questions) 1. In the design of a Bunsen burner, explain the purpose of a. the gas control valve The gas control valve regulates the rate at which methane enters the burner. b. and the air vents. The air vents control the rate at which air enters the burner 2. Why is a luminous yellow flame often ‘‘smoky’’? The luminous yellow flame is smoky because no air is entering the burner and hydrocarbon is converted into carbon dioxide 3. A student wanted 20.000 g of a salt. Which balance should the student use in order to …show more content…
The difference between an intensive property and an extensive property is that the extensive property of a substance whereas an intensive property does not. Density is an example of intensive property of a substance Extensive property example: mass 2. In order to calculate the density of a solid or liquid sample, what measurements are needed? Mass and volume 3. The volume of a fixed mass of a liquid sample increases as the temperature rises from 20 to 408C. Does the density increase, decrease, or stay the same? Explain your answer. The density decreases. Density of the liquid sample is the mass divide by the volume. If the mass stays constant and the volume increases then the density of the liquid sample will decrease. 4. A solid block of exactly 100.0 cm3 has a mass of 153.6 g. Determine its density. Will the block sink or float on water? Density (d)=m/v = 153.6g / 100cm3 = 1.536 g/cm3 Since this solid block is more dense than water (1.536 g/cm3 > 1 g/cm3) it will sink. 5. A salvage operator recovered coins believed to be gold. A sample weighed 129.6 g and had a volume of 15.3 cm3. Were the coins gold (d = 19.3 g/cm3) or just yellow brass (d = 8.47 g/cm3)? Show your work. Density (d)=m/v = 129.6g / 15.3cm3 = 8.47 g/cm3 The density of the coins is 8.47 g/cm3 which matches the density of yellow brass the coins recovered are yellow brass The purpose of the
1. What do you think would happen if you threw a block of Styrofoam™ into the water? The Styrofoam will float
Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.
The purpose of the lab was to determine the ratio of air to acetylene results in complete combustion of acetylene gas. The balanced chemical equation for this experiment was C2H2(g) + O2(g) --> CO2(g)+ H2O(l). Complete combustion is the reaction of an element or compound with oxygen to produce the most common oxides and energy. Complete combustion occurs when the fuel and oxygen combine in exact proportions to completely burn the fuel, which leaves a clean test tube. Incomplete combustion is the reaction of an element or compound with oxygen to produce some oxides with less oxygen than the most common oxides. Incomplete combustion occurs when there is not enough oxygen to react
Density is the amount of matter per unit of measurement (Merriam-Webster. Merriam-Webster, n.d. Web. 26 Aug. 2016.). If water has a density of 1.0 g/mL and you place a substance with a density of 1.8 g/mL the substance will sink because it is denser than water. Density is often measured in g/cm^3 or g/mL because the formula for density is D=m/v.
This experiment was performed to determine the difference in density between pre-1982 pennies and post-1982 pennies. In addition, we were given an unknown substance and our task was to configure what it was through calculating its volume,mass, and density. Furthermore, we were being introduced to the procedures of displacement in this experiment as well. All together, we were given the task of finding out why there was a difference in density between the two pennies. My partner, Michael Sapawa, and I first had to measure the mass of both pennies using a scale. Then we calculated the volume of the samples with graduated cylinders through the method known as displacement. We then applied our schema and drew out the formula for density, which
Procedure: Using distilled water, premeasured containers and objects determine displacement of fluids and density of objects. Use ice and heat measure temperatures in Celsius, Fahrenheit and Kelvin.
If I fill up two different containers with different amounts of water, then I will be able to understand the density of the two different mass/volumes of two different containers.
11. Tare the scale by pressing the Φ/T button so that the scale reads 0.0 g.
This experiment was performed to observe differences in density based on the chemical makeup of an object. Pennies minted before 1982, pennies minted after 1982, and an unknown metal sample was tested to see if there were any differences in their densities. Ten pennies from each category and the metal sample were weighed using a scale to find mass and the displacement method was used to find their volumes. The masses and volumes were then used to calculate the densities of the pennies (D=m/v). The density of the pre-1982 pennies were 8.6 g/mL while the post-1982 pennies were 6.9 g/mL. The metal sample’s density was 1.7 g/mL. Following the experiment we were given the real densities of each item to calculate the percent error with the formula
Weight 30 dry pre-82 pennies which get 89.77g, using 30ml initial volume measuring the volume of 30 pennies, record the data 10.0ml. Using equation Density= Mass/Volume, get the density of the pre-82 pennies is 8.98g/ml. Then calculate the error%=0.10%, and the deviation%=1.29%.
5. A local grocery store was holding a contest to see who could most closely guess the number of pennies that they had inside a large jar. The first six people guessed the numbers 735, 209, 390, 300, 1005 and 689. The grocery clerk said the jar actually contains 568 pennies.
CHM130 Lab 6 Exploring Density Name A. Data Tables Place your completed Data Tables here Part IIIa (3 points) Volume of water in graduated cylinder (mL)10 mlMass of rubber stopper (g)11.15Volume of water and rubber stopper (mL)16.5 Part IIIb (6 points) Volume of water in graduated cylinder (mL)20Mass of iron nail (g)3.66Volume of water and iron nail (mL)20.5 Part IV (20 points) Type of Aluminum FoilMass (g)Length (cm)Width (cm)Volume (cm3)Thickness (cm)Regular.63g15 cm 10.02 cm.21 cm3.0014 cm Heavy Duty.97g15 cm10.01 cm .36 cm3.0024 cm B. Follow Up Questions Show all work for questions involving calculations. Part I Use the concepts/vocabulary of density to explain why the liquids formed layers in Part I of the procedure. (8 pts)
Write a balanced chemical equation for each reaction #1-8. Classify each reaction using the information provided in the
D. A sample of gold (Au) has a mass of 26.15 g. Given that the theoretical density is 19.30 g/mL,
During this time, there were a number of different gold extraction techniques that involved mercury [3]. The common rocker, which looks similar to a child’s crib, was