4. This is the idea that energy can be transformed from one form to another, but it

cannot be created or destroved

What is the percent composition of carbon in caffeine (C₈H₁₀N₄O₂) ?

A particular air sample at 1 atm pressure has a density of ~ 1.3 g/L and contains SO2 at a concentration of 25 ug/m3. What is the concentration in terms of the following units: a. Parts per million (mass SO2 per 106 units mass of air) ? b.

The element oxygen would be expected to form covalent bond (s) in order to obey the octet rule. use the octet rule to predict the formula of the compound that would form between oxygen and hydrogen, if the molecule contains only one oxygen atom and

What is the ph of pure water at 40.0°c if the kw at this temperature is 2.92 * 10-14?

A jogger runs with a velocity of 3.109 m/s NW over a period of 53.10 minutes. If the jogger initially ran SE for 911.9 m before changing direction and heading NW, what total distance did he run?

A flask is charged with 3.00 atm of dinitrogen tetroxide gas and 2.00 atm of nitrogen dioxide gas at 25ºC and allowed to reach equilibrium. N2O4 (g) - ->2 NO2 (g) Kp = 0.

Which of the following represents gamma emission? O A. 164Gd 188TB + ge O B. prc = $TC+7 O C. 1962 1945m + 2 He O D. 199 Eu + 4e - 154 Sm SUBI

Which is more metallic a) Silicon b) Aluminum

Round the following number to three significant figures: 156.5021 L

Select two options from the following list that qualify as types of pure substances. a substance an atom an element a particle matter a compound