Why are noontime shadows longer in winter than in summer?

Same as my last question this is astronomy not chemistry.

The value of h for the reaction below is - 73 kj how many kj of heat are released

5.80 gg of NaCl in 350. mL of a NaClsolution Express your answer with the appropriate units.

Give the ion symbol for the the ion that has 15 protons and 18 electrons

Need it fast! Given the balanced equation below, calculate the moles of aluminum that are needed to react completely with 13.2 moles of FeO? You must show all of your work. 2Al+3FeO--> 3Fe+Al2O3

Is table salt (pure) an element compound or mixture

In 1901, Thomas Edison invented the nickel-iron battery. The following reaction takes place in the battery. Fe (s) + 2 NiO (OH) (s) + 2 H2O (l) Fe (OH) 2 (s) + 2 Ni (OH) 2 (aq) How many mole of Fe (OH) 2, is produced when 5.35 mol Fe and 7.

As you move from left to right across the periodic table, the atomic numbers increase decrease stay the same are random

Use the octet rule to predict the formula of the compound that would form between fluorine and iodine, if the molecule contains only one fluorine atom and only single bonds are formed.

64.0 grams of Sulfur Dioxide absorbed 5.00 kJ of heat and immediately evaporated. With this information, calculate its molar enthalpy of vaporization in units kJ/mol.

Which of these is not a biomass source? A) Sun B) Manure C) Wood chips D) Paper