Porquê que o potássio é mais reativo que o cálcio? urgente!

How are independent and dependent variables related?

Why do solids have a fixed shape? A. The particles vibrate B. The particles are free flowing C. The particles do not move D. The particles are tightly packed together

Calculate the percent ionization of 0.140 m lactic acid in a solution containing 8.5*10-3 m sodium lactate.

The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect of a cobalt-60 nucleus? (The mass of a 60Co nucleus is 59.9338 amu.) 4.6136 x 10-23 g 8.9754 x 10-25 g 9.1747 x 10-25 g 1.0993 x 10-25 g 8.

What salt is produced in each of the following neutralization reactions? HNO3 (aq) + KOH (aq) →H2O (l) + ? HNO3 (aq) + Ca (OH) 2 (aq) →H2O (l) + ? HCl (aq) + Ca (OH) 2 (aq) →H2O (l) + ? HCl (aq) + KOH (aq) →H2O (l) + ?

A sample of C3H8 has 4.64 * 1024 H atoms. How many carbon atoms does the sample contain?

What is the value of 200c on a Kelvin scale

Calculate the moles of new H₂ O₂ using the balanced formula below and the average moles of KMnO₄ from calculation #2. The average moles of KMnO₄ is 0.90mol. 2KMnO₄ + 5H₂O₂ + 3H₂SO₄ → K₂SO₄ + 2MnSO₄ + 8H₂O + 5O₂ Edit: I got 2.

How many grams of CaC2 would make 23.6g C2H2?

Shane performed the following trials in an experiment. Trial 1: Heat 30.0 grams of water at 0 °C to a final temperature of 40.0 °C. Trial 2: Heat 40.0 grams of water at 10.0 °C to a final temperature of 40.0 °C.