How many moles of calcium (Ca) atoms are there in 77.4 g of Ca?

What element has the strongest pull on its electrons?

A reaction was conducted between barium nitrate and sodium phosphate. 3 Ba (NO3) 2 + 2 Na3PO4 → 6 NaNO3 + Ba3 (PO4) 2 What is the percent yield if 0.3 mol Ba (NO3) 2 and 0.25 mol Na3PO4 react to produce 0.095 mol Ba3 (PO4) 2?

A 250.0 mL sample of aqueous solution contains an unknown amount of dissolved NaBr. Excess aqueous Pb (NO3) 2is then added to this solution and a precipitate forms. A. If the mass of precipitate recovered was 3.

How do ions, anions, and cations bond to create electronic neutrality?

Which of the following is true about neutrons? A) Neutrons provide a positive charge to the atomic nucleus. B) Neutrons neutralize electrons. C) Neutrons provide a negative charge to the atomic nucleus.

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?