What is a device that changes electrical energy into mechanical energy?

Which of the following statements is true? a. Nonpolar solvents are useful for dissolving polar solutes. b. Polar solvents are useful for dissolving nonpolar solutes. c. Nonpolar solvents are not useful because they do not form solutions with water.

Calculate the energy in joules and calories required to heat 25.0 g of water from 12.5C to 25.7C

The more particles an object has at a given temperature the more thermal energy is has true or false

Which can not be decomposed by a chemical change? 1) a compound 2) a heterogeneous mixture 3) a homogeneous mixture 4) an element

Does the chemical symbol for iron come from its English name? Explain

Which types of orbitals are found in the principal energy level n = 4? A. S, d B. S, p, d, f C. S, p D. S, p, f E. S, d, f

Transport means to move something from one place to another. True False

What are two reasons that ocean water sinks in the Arctic Ocean? A. The surface water is warmer and less salty than normal. B. The surface water is warmer and more salty than normal. C. The surface water is colder and less salty than normal. D.

Which statement best describes the conductivity of weak electrolytes, such as weak acids and bases? A) Weak electrolytes do not dissolve in water and can not conduct electricity.

Two speakers are placed side by side and are described as having constructive interference. How do you know when constructive interference of sound waves has occurred?