A 25.0 g sample of pure iron at 85.0°C is dropped into 75 g of water at 40.0°C. What is the final temperature of water-iron mixture?
If 3.17 moles of ethane, C2H6 undergo combustion,according to the unbalanced equation C2H6+O2–> CO2+H2O, how many moles of oxygen are required?
A small immersion heater is rated at 400W. Estimate how long it will take to heat a cup of soup (assume this is 200 ml of water) from 23oC to 87oC. A milliliter is a cubic centimeter.
To identify a diatomic gas (rm X_2), a researcher carried out the following experiment: She weighed an empty 1.00-rm L bulb, then filled it with the gas at 1.10 rm atm and 23.0 ^circrm C and weighed it again. The difference in mass was 1.27 rm g. Identify the gas.Express your answer as a chemical […]
Ensure all solar system objects are visible by checking all options under Solar System in the View menu and under the Labels menu check Planets-Moons. Beginning at sunset and looking toward the east, advance time forward (I recommend using 30x). Which dwarf planet was first to rise over the horizon? Makemake Ceres Pluto Eris What is the azimuth of the object in the […]
Neurotransmitters are chemical substances that neurons use to communicate with other neurons, muscles and glands. Describe at least one of the classes of neurotransmitters and its (their) functions.
What is the molecular structure and bond angle of PCl2-
The strategies and recommendations to address the use of lectronic health records problems.
how fast must a 144.1g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with = 73 pm?m/s
a sample of 20.0ml of .10M CH3NH2 is titrated with .15M HCl. the Kb for CH3NH2 = 4.2 X 10^4
