Looking at the periodic table, which element is a non-metal?

A. argon (Ar)

B. silicon (Si)

C. potassium (K)

D. magnesium (Mg)

What is the difference between Ionization energy and Electron Affinity?

If 250.0 g of water at 30.0 °C cool to 5.0 °C, how many kilojoules of energy did the water lose?

I have 0.92 moles of water (H20). What is the mass of the water?

You find a ring with a mass of 107g. You fill a graduated cylinder up with 10ml of water and put the ring into the cylinder. The water rises up to the 15ml mark. How much water was displaced?

If 3.5 g of element X reacts with 10.5 g of element Y to form the compound XY. what is the percent by mass of element X in the compound? The percent by mass of element Y?

Hydrogen Sulfide decomposes according to the following reaction, for which Kc=9.3 x 10^-8 at 400 degrees Celsius. 2 H2S (g) ⇄ 2 H2 (g) + S2 (g) If 0.47 moles of H2S are placed in a 3.0 L container, and the system is allowed to reach equilibrium.

Q5.6. if calcium ions, each of which has a charge of + 2 (ca2+), moved out of a neuron, and no other ions were moving, what would be true?

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.

What is the intermolecular Force that causes water molecules to be attracted to each other? Ionic Bond Polar covalent bond Nonpolar covalent bond Hydrogen Bond What is the molecular geometry of a water molecule?

Justin Bleeber is a lazy young man and decides to burn a pile of leaves instead of bagging it. The pile of leaves weighed three pounds before being burned. After the leaves are burned the leftover ash weighs half a pound.