which of the following steps of the scientific method involves stating a relationship but not proposing an explanation for the relationship? a) hypothesis b) scientific law c) theory d) observation

What practical use does adding salt to water have A. unfreezing glaciers B. freezing the ocean C. keeping ponds liquid D. melting ice on roads and sidewalks

Sodium chloride is produced from its elements through a synthesis reaction. What mass of each reactant would be required to produce 25.0 mol of sodium chloride?

A balloon has a volume of 253.2 ml at 356k. the volume of the balloon is decreased to 165.4ml. determine the new temperature

How does the digestion of food involve both physical and chemical change

Which of the following statements is not true about the decomposition of a simple binary compound? a) The products are the constituent elements. b) The reactant is a single substance. c) The reactant could be an ionic or a molecular compound.

What is the ratio of effusion rates of krypton and neon at the same temperature and pressure?

Balance the following equation _NaOH (aq) + _HNO3 (aq) > _NaNO3 (aq) + _H2O (1)

Researchers discovered a subatomic partial while working with the cathode ray tube the particle is known as

An electrochemical cell is constructed such that on one side a pure nickel electrode is in contact with a solution containing Ni2 + ions at a concentration of 2 * 10-3 M.

The lines in an element's atomic spectrum result from electron spins going in opposite directions. energy that is spread out among an atom's electrons. electrons moving from a lower to a higher energy level.