Erma built the simple motor shown below with a battery, a permanent magnet, a copper coil of wire, and an iron bar. when the motor is turned on, the iron bar and coil spin in a circle. the motor transforms energy into energy. a. thermal; electrical b. mechanical; electrical c. electrical; mechanical d. mechanical; chemical

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

Match the formula for the following compound:   magnesium sulfate heptahydratemgs·7h2omg2so4·7h2omg(so4)2·7h2omgso4·7h2o