Which of the following is a polyatomic ion?

A. Calcium, Ca2+

B. Carbide, C4-

C. Sulfate, SO4

D. Selenide, Se2-

What is the ph of a solution with [oh-] = 2.6 * 10^-3 m?

what is a type of science that studies Earth and space

Bacteria multiply by what?

4. How many moles of baking soda (NaHCO3) is this? A. 66,200,000 moles B. 500,000 moles C. 6550 moles D. 5950 moles

Which reaction is an example of heterogeneous catalysis? Ethene gas reacts with hydrogen gas by using a nickel catalyst. Hydrogen peroxide decomposes by using an aqueous iodide ion catalyst. Formic acid decomposes by using an acidic catalyst.

Why was Bohr's model considered more accurate than Dalton's model?

Select the statements that correctly describe a buffer. 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) A buffer is generally made up of a weak acid and its conjugate base.

What chemical molecules are required for cellular respiration?

A 2-column table with 3 rows. Column 1 is labeled Substance with entries upper O subscript 2, upper N subscript 2, upper C upper O subscript 2. Column 2 is labeled Molar mass with entries 32.00 grams per mole, 28.02 grams per mole, and, 44.

How do you know if the reaction is exothermic or endothermic if both phase are same?