How many balloons, each containing 6.02*10^23 particles of helium gas, can be filled from a tank that contains 1.204 * 10^25 helium particles?

Arsenate, AsO43-, a structural analog of phosphate, can act as a substrate for any reaction in which phosphate is a substrate. Arsenate esters hydrolyze instantaneously, so for example, the arsenate analog of ATP becomes ADP instantly.

When a tire is inflated with air is it a chemical or physical change?

Which pair of elements would form an ionic bond? carbon (C) and oxygen (O) strontium (Sr) and chlorine (Cl) cesium (Cs) and germanium (Ge) magnesium (Mg) and aluminum (Al)

The strongest light left over from the big bang is called background radiation and was given off as which type of wave? A. Radio waves B. Visible light C. Microwaves D. Gamma rays

Which of the following statements provides the BEST explanation for the many chemical similarities between two elements in a Main Group? (Note: only ONE answer here.!) (a) They have similar atomic mass values.

A scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. Does this result support the theory of plate tectonics? Why or why not?

Why is it incorrect to balance a chemical equation by changing the subscripts?

A solution of CuSO4 is labelled 0.01 M. How much CuSO4 in grams, must be used to make 1 liter of solution? A) 1.120 g B) 1.595 g C) 1.6 g D) 15.0 g

Rank the following elements according to their ionization energy: tin krypton antimony arsenic

Water (3030 g) is heated until it just begins to boil. If the water absorbs 5.49*105 J of heat in the process, what was the initial temperature of the water?