When air is heated, its density
A. Increases
B. Decreases
C. stays the same

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

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)