What is the percent by mass of sodium in Na2SO4? total mass of element in compound molar mass of compound Use %Element x 100

What is a sun spot? in the sun on the surface

What happens to the energy release of an exothermic reaction

When vinegar and baking soda are combined, bubbles begin to form. Bubbles are evidence of a chemical reaction because they - A. pop when they are touched. B. show that a gas is forming. C. form at a fast rate. D. are generally transparent.

Is it true that Two or more different substances combine physically to form a mixture.

Convert 44 centimeters to meters. A. 4 m B. 4.4 m C. 0.44 m D. 0.044 m

How many daughter cells are produced in meiosis?

Sodium chlorite - > sodium chloride + oxygen what type of chemical reaction is represented by this equation

The mixing of which pair of reactants will result in a precipitation reaction? the mixing of which pair of reactants will result in a precipitation reaction?

A balloon has 18.9 moles of hydrogen gas at a volume of 428 L. What would the volume of the gas be if the balloon had 14.0 moles of hydrogen gas left after 1 day?

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pKa of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 1006.