Which of the following equations are balanced correctly?

A: Cu + H2O → CuO + H2

B: Zn + HCl → ZnCl2 + H2

C: 2C4H10 + 13O2 → 8CO2 + 10H2O

D: 2Ag2O → 4Ag + O2

Which sound wave-object interaction is used by animals in echolocation?

A cylindrical resistor element on a circuit board dissipates 0.15 W of power in an environment at 40°C. The resistor is 1.2 cm long, and has a diameter of 0.3 cm.

Explain whether the temperature of a substance must increase when thermal energy is added to the substance

Siven an element's atomic number and mass number, how can you tell the number of protons and neutrons in its nucleus?

Estimate the smallest possible period of a satellite in a circular orbit around earth. (mass and radius of earth is 5.98 x 1024 kg and 6.37 x 106 m. the universal gravitational constant g = 6.67 x 10-11 n. m2/kg2.)

Which describes a property shared by ultraviolet light and X-rays? A They are both transverse waves. B They share the same wavelength. C They contain less energy than visible light. D They both require a medium to travel through.

What is the potential energy called that is associated with objects that can be stretched

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a