A glass rod was heated in a burner flame and gave off a bright yellow flame....
When a compound containing sodium ions is heated in a Bunsen burner flame, photons with an energy of 3.38 x 10^-19 J are emitted. What is the wavelength and color of the sodium flame? 589 nm yellow light light that is not visible to the naked eye 463 nm 542 nm 689 nm red light No answer text provided. Green light blue light 338 nm.
A solution was heated in a Bunsen burner flame before heating, it was a clear colorless liquid. After heating no liquid remains, but a gray white residue remains in the heating vessel. Is this more likely to be a chemical or physical change? А chemical change B. Physical charge c. more information is needed o this cannot be described as purely a chemical or physical change
3. What tests would you use to identify a solution of FeCl3? 4. A flame test of a colorless solution gives a bright yellow color. When reacted with AgNO, a white precipitate forms that dissolves when HNO, is added. When HCl is added to the unknown solution, bubbles form. What is the compound in the colorless solution?
A metal rod 25.0000 cm long at 25.0 °C is heated to 125 °C. The length of the rod is then measured to be 25.0025 cm. What is the coefficient of linear expansion of the metal? 0.0001 1/C O 0.000001 1/C 0.0000001 1/C 0.00001 1/C
1. A mass of 3.462 g of a metal carbonate, MCO3, is heated to drive off carbon dioxide. The remaining metal oxide has a mass of 2.229 g. MCO3(s) → MO(s) + CO2(g) What is the identity of the metal?
Questions(Answer on an attached sheet of paper and turn in with the report) 1. Why do metals give off different colors in a flame test? 2. You spray paint the letters SPECTROSCOPY in yellow paint on snow. After a while the sun comes out and the snow under the yellow paint melts, leaving the letters in the word SPECTROSCOPY intact. Why did the snow under (rather than around) the yellow paint melt? 3. The graph below shows the absorption spectra...
Solids also resist being pulled apart. you can break a metal or glass rod by pulling the ends in opposite directions, but it takes a large force to do so. what can you infer from this observation about the properties of atoms?
1. Part 2 white complete structures for the major product(s) resulting from the following reactions. Ao Propanal + 2,4-dinitrophenylhydrazine --- 2-hexanol + ZnCl2 + HCI ----.. . . isopropyl alcohol + CrO3/H2S04 --- 1-butene + Br2/CH2Cl2 → In the space below, draw structures for the following: a. Bromobenzene b. Butanal Acetophenone Benzaldehyde e. Aniline 3. The following observations are frequently made in the laboratory. In each case below state in The following cheer brief terms, the deduction or deductions which...
Determination of Specific Heat of Metals: (8 points) Ametal rod with a mass of 50.0 g was heated to 100°C in boiling water for 10 minutes and then placed into a cup of water containing 40 mL of water at 22.5 C. The temperature increased to a maximum of 34.4'C. The specific heat of water (Cp) is 4.184 J/g K and q = mx CP X AT a). How much heat (in Joules) was gained by the water? b). How...
When a metal rod is heated, not only its resistance but also its length and cross‐sectional area change. The relation R = ρL / A suggests that all three factors should be taken into account in measuring ρ at various temperatures. If the temperature changes by 1.10oC, what percentage changes in (a) L, (b) A, and (c) R occur for a copper conductor? The coefficient of linear expansion is 1.70 × 10-5 K-1. Coefficient of resistivity for copper is 4.30...