What is the correct formula for the ionic compound formed between calcium and chlorine?

A water sample contains 5 mg of dissolved chloride ions per liter of solution. This concentration is equivalent to:

Which type of radioactive emission has NO mass and NO charge, consisting of high-energy electromagnetic radiation?

The reaction 2 H₂(g) + O₂(g) → 2 H₂O(l) is best classified as which type of reaction?

How much heat (in joules) is required to warm 50.0 g of water from 20.0 °C to 80.0 °C? (Specific heat of water =...