The magnitude of a star is a number that is a measure of its brightness as seen on Earth. The brighter the star, the lower its magnitude. The data below show the magnitudes of five stars in our galaxy. Between what two consecutive integers is the magnitude of each star located? In most applications, the magnitude of a number is its size or amount. However, when talking about the magnitude of a star, magnitude includes negative numbers. Polaris (The North Star): 1.97 Sirius (The Dog Star): -1.45 Hadar (Beta Centauri): 0.61 Arcturus: -0.04 Canopus: -0.72

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

The biosphere of the earth is made up of what compound? organic or inorganic?