Why are noontime shadows longer in winter than in summer?

Same as my last question this is astronomy not chemistry.

At 37 °C the concentration of Fe3 + inside a cell is 0.053 M and outside is 0.044 M. The cell membrane is permeable to Fe3+.

Which of there statments are not true about chemical rates? a. the reaction rates are always constant b. the reaction rates decrease c. the reaction rates can increase d. the reaction rates change

Enter the correct answer for each unit conversion. mm = 5 cm 48 in = ft ft = 12 yd 2.5 m = cm 1,000 mL =

Which of the following represents a compound? H2O O-16 H-3 H

The sodium atom loses an electron to form a sodium ion (Na+). Which statement is correct with respect to its atomic radius? The sodium ion has a larger radius than the atom. The sodium ion has a smaller radius than the atom.

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents

For which purpose do biochemists insert human genes into bacteria? to find a cure for the common cold to produce insulin for diabetics to kill resistant strains of bacteria to evolve certain species of bacteria

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec