Explain why the density of a metal object decreases when the object expands

Given the following chemical reaction: 2 O2 + CH4 CO2 + 2 H2O In the reaction of 6 moles of CH4 with excess oxygen, how many moles of water could be produced? 6 C 12.01 Carbon 1 H 1.01 Hydrogen 8 O 16.00 Oxygen A. 4 B. 6 C. 8 D. 12

Calculate the rate of emission of SO2 in g/s that results in a centerline (y = 0) concentration at ground level of 1.786 x 10-3 g/m3 one kilometer from the stack. The time of measurements was 1 P. M. on a clear summer afternoon. The wind speed was 2.

Which of the following represents a chemical change? A. Bending a wire B. Freezing of water C. Fireworks exploding D. Melting of a wax candle :D

Choose the thermochemical equation that best illustrates ΔH°f (enthalpy of formations) for Li2SO4. A) 2 Li + (aq) + SO42 - (aq) → Li2SO4 (aq) B) 2 Li (s) + 1/8 S8 (s, rhombic) + 2 O2 (g) → Li2SO4 (s) C) Li2SO4 (aq) → 2 Li + (aq) + SO4 2 - (aq) D) 8

Whenever a molecule is oxidized, another molecule must be reduced. a. True b. False?

Ionic bonds are strong; therefore, ionic compounds

A cells that carry information through tour nervous system

True or False: According to the present atomic theory, the location of an electron in an atom is best represented by a probability cloud.

How can we measure the density of different wooden objects

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic. True or False?