Which statement is true about elements?

Select one:

a. They are finite in number.

b. They are infinite in number.

c. They combine to form atoms.

d. They combine to form electrons.

Calculate the mass of the precipitate formed when 2.27 L of 0.0820 M Ba (OH) 2 are mixed with 3.06 L of 0.0664 M Na2SO4.

Consider conjugation. A long molecule contains a conjugated network of double bonds. Two of these double bonds begin at carbon 2 and carbon 8. At which carbon must a double bond also begin? 3 4 5 6 more than one of the above choices is correct

Why do hurricanes form over warm oceans rather than cold oceans?

Which represents an empirical formula? A. C2H4 B. B2H6 C. Al2O3 D. C6H6

If 3.0 moles of A and 4.0 moles of B react according to the hypothetical reaction below, how many moles of the excess reactant will be left over at the end of the reaction? A + 2B → AB2

How many valence electrons in Al3+?

What can be done to make an solid solute dissolve faster in a liquid solvent

Why does the water cycle happen fast in some places and slowly in other places?

Why does the mood have phases

According to Arhennius, which of the following is a base? * A. HCl B. HNO3 C. NaCl D. NaOH