One mole of carbon-12 has a mass of 12.00 grams. What is the mass of a ¹2C atom? Multiple Choice O 1.244 x 10-26 kg
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- Week 1 Assignment Part 2 - PHSO V01 1. Match the parts of an atom in the left column with all the phrases in the right column that describes it. A phrase may be used more than once. On the line in the left column next to the parts of the atom, please just label the letter of the phrase that matches the parts of the atom. 1. electron 2. neutron This assignment is due on 8/23 at 11:59pm PST. Please submit as a scanned PDF on Canvas. 3. proton A) one has atomic mass B) found in the nucleus C) negatively charged D) changing the number of these in an atom creates a new element E) adding or losing these makes an atom into an ion F) gain or loss of these makes an isotope of the same element G) determine(s) an element's atomic number H) contribute(s) to an element's atomic mass10. What prevents gravity from pulling you through the ground to the center of Earth? Choose the best answer. A. The positive nuclei of your body's atoms repel the positive nuclei of the atoms of the ground. B. The density of the ground is greater than the density of your body. C. Atoms are bound together by chemical bonds. D. Electrons on the ground's surface and the surface of your feet repel one another.7. A body of unknown temperature is placed in a refrigerator at a constant temperature of 0 °F. If after 20 minutes the temperature of the body is 40 °F and after 40 minutes the temperature of the body is 20 ° F, find the initial temperature of the body. (use Newton's Law of Cooling/Warming) 8. A radioactive substance is known to decay at a rate proportional to the amount present. If initially there is 50 milligrams of the substance present and after two hours it is observed that the substance has lost 10% of its original mass, Find the time at which the material has decayed to one half of its initial mass.
- The normal boiling point of radon is -95.8 F.What is this temperature in kelvins?QUESTION 10 Which of these expressions would yield the wavelength of light in meters emitted when an electron drops from orbit n = 3 to n = 2 in a Bohr hydrogen atom? Given h = 4.14 x 10-15 eVs and c = 3.00 x 108 m/s. a. hc/1.89 b. 1.89 x h x c c. 1.89/hxc d. (1.51 + 3.4)/hc e. hc/3.4Which of these expressions would yield the wavelength of light in meters emitted when an electron drops from orbit n = 3 to n = 2 in a Bohr hydrogen atom? Given h = 4.14 x 10-15 eVs and c = 3.00 x 108 m/s. a. 1.89/hxc b. hc/1.89 c. 1.89 x h x c d. (1.51 + 3.4)/hc e. hc/3.4
- 9Which of these expressions would yield the wavelength of light in meters emitted when an electron drops from orbit n = 3 to n = 2 in a Bohr hydrogen atom? Given h = 4.14 x 10-15 eVs and c = 3.00 x 108m/s. a. 1.89 x h x c b. hc/3.4 c. (1.51 + 3.4)/hc d. hc/1.89 e. 1.89/hxcPart 1: Carbon dating An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 387 g (HINT: Assume all the carbon is 12C and determine the number of atoms, 12C has a molar mass of 12 g/mol) and careful measurements show that the remaining 14C has a current decay rate of 20 decays/s. Determine the age of the bone (and presumably the jewelry). The ratio of 14C to 12C when the animal died was 1.25x10-12 & the half-life of 14C is 5730 y. Additionally, 1 mol = 6.022×1023 particles, 1 y = 365.25 days, & 1 day = 24 h. age of bone = Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This is possible because 87Rb, which has a half-life of 4.75×1010 y, undergoes - decay and becomes 87Sr. The geologist determines that the ratio of 87 Sr to 87Rb is 0.033. Assuming there was no 87Sr in the rock when it was formed, determine the age of the rock. age of rock =