Which two periods have the same number of elements

Toolkit How many energy levels does sulfur have? A. 2 B. 3 C. 4 D. 14

Carbon and oxygen combine to form carbon dioxide. What are the products, or what is the product, in this chemical reaction?

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400. mL of a solution that has a concentration of Na + ions of 1.

Which of the following statements is TRUE about cells? A Cells are made up of smaller living things, called organelles. B For something to be alive, it must be made of many cells. C Cells are the smallest unit that can be considered alive.

What happens during a neutralization reaction?

What is the mole fraction, x, of solute and the molality for an aqueous solution that is 16.0 % NaOH by mass

What is the square root of 54554? What is the square root of 35654?

Halogens have ... Electron affinity

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.