Which of these equations is balanced? (neither and both are an option)
a. 3 h2so4 + 2al → al2(so4)3 + 3h2
b. 2kcl + pb(no3)2 → 2kno3 + pbcl2

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood