Earth is surrounded by an envelope of gases called the

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

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