Mass What is the percent composition by mass of
nitrogen in the compound N, H, (gram-formula
32 g/mol)?
(1) 13%
(3) 88%
(2) 44%
(4) 93%

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

Which metals are called noble metals

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.