Machines are never 100 percent efficient because some work is used to overcome friction and inertia. True False

Which of these is an example of a physical change? sugar dissolving in warm water iron rusting in the presence of moist air wood burning in the presence of oxygen baking soda reacting with acid to form a gas

The average radius of a molecule of lysozyme, an enzyme in tears, is 1.430 * 10^-3 um. What is its radius in millimeter? Enter your answer in scientific notation.

28.5g of iron shot is added to a graduate cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL, From this information calculate the density of the iron?

The use of ultraviolet or fl uorescent dyes in an r-1234yf system is

What happens when an electron moves from a higher energy level to a lower one

The Hoover Dam in Nevada, supplied by Lake Mead, generates hydroelectric power for several western states, including the numerous lights in Las Vegas.

How can I calculate the percent concentration of solution? m solute = 15g m solution = 100g

What is the balanced equation of the decomposition reaction of hydrogen peroxide?

The plant food contains nh4) 3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion

How many atoms of each element does potassium nitrate, KNO3, contain? A. Potassium = 3 atom, Nitrogen = 3 atom, Oxygen = 3 atoms B. Potassium = 3 atom, Nitrogen = 1 atom, Oxygen = 3 atoms C. Potassium = 1 atom, Nitrogen = 3 atom, Oxygen = 3 atoms D.