At 20o c, the density of a 20% by mass ethanol-water solution is 968.7 kg m-3. given that the partial molar volume of ethanol in the solution is 52.2 cm3 mol-1, calculate the partial molar volume of the water
A 50.88 g sample of a substance is initially at 26.1 °c. after absorbing 2159 j of heat, the temperature of the substance is 114.9 °c. what is the specific heat (sh) of the substance?
Why is it important to have the correct bond angles of the different atoms and the shape of the molecule?
In a cathode ray experiment, electron is emitted from the surface of a negatively charged electrode, which is called ?
Please view the video at — https://www.youtube.com/watch?v=B7NPtCOPAZ4 — Submit a short paper (500 words) reflecting on the presentation. Digital technology is quickly becoming a central part of our lives. But in our digital world, we cannot lose sight of the importance of tactile experiences in a science classroom. Dr. Carol O’Donnell argues that it’s not about resisting the […]
What makes this excerpt from Oliver Twist by Charles Dickens an example of direct characterization? The elderly female was a woman of wisdom and experience; she knew what was good for children; and she had a very accurate perception of what was good for herself. So, she appropriated the greater part of the weekly stipend […]
A sample of vinaigrette salad dressing has a total mass of 188 g, a total volume of 196 cm3, and consists only of oil (density = 0.891 g/cm3) and vinegar (density = 1.056 g/cm3). What is the volume of each component in this mixture? Assume that the volumes are additive.
Recall Planck’s constant equals 6.63 a 10^-34 j.s and the speed of light is 3.00 x 10^8 m/s. Calculate the wavelength in nm of a photon emitted by a hydrogen atome when its electron drops from the n=4 state to the n=3 state.
When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties Mendeleev’s Law the Pauli Exclusion Principle Hund’s Rule Periodic Law
3 Br2 + 6 OH1- → 5 Br1- + BrO31- + 3 H2OIf 0.452 moles of OH1- are reacted with an unlimited supply of Br2, how many moles of H2O can be formed?
