What does the number next to the ions signify?

Students are comparing the physical properties of sugar water, salt water, and plain water, including the affects of thermal energy.

What would the molecular formula be if magnesium and nitrogen reacted to form a neutral compound? A. Mg2N3 B. Mg3N2 C. Mg6N6 D. Mg4N6

What volume of 0.500 M HNO3 (aq) must completely react to neutralize 100.0 milliliters of 0.100 M KOH (aq) ?

Calculate the mass percent of sr (no3) 2 in this solution, assuming the density of the solution is 1.000 kg/l.

A resting object exerts pressure equals to

How many atoms of Hydrogen are in 67.2 L of H2 at STP?

If a 45 mM phosphate solution (solution A) had an absorbance of 1.012. What would be the absorbance if 11 mL of solution A was used to prepare a 20.0 mL of a new phosphate solution. Write answer to three significant figures.

Which choice best describes the specific heat of water compared with that of metals? A) The specific heat of water is less than the specific heat of metals. B) The specific heat of water is about the same as the specific heat of metals.

Which of the following answer choices best describes J. J. Thomson's plum-pudding model? An atom is surrounded by a firm outer shell and contains positively charged particles in its core.

A series of enzymes catalyze the reactions in the metabolic pathway X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. What is substance X?