According to periodic table which elements has seven valence electrons

How much energy is released when 5.28g of acetone freezes?

The [H3O+] in a solution is increased to twice the original concentration which change could occur in the pH

Which is a feature of a single replacement reaction? a. Substance XYZ breaks down into X and YZ. b. Substance G reacts with compound XY to form GY and X. c. Substance X burns rapidly in the presence of oxygen. d.

Cells can manipulate the free energy of reactions by: (Select all that apply) Changing the concentrations of products and reactants Changing the concentration of the enzyme involved in the reaction Using enzymes A.

Consider the reaction. 2 upper C (s, graphite) plus upper H subscript 2 right arrow upper C subscript 2 upper H subscript 2 (g). Standard Enthalpies of Formation Substance DHf (kJ/mol) C2 H2 (g) 226.73 CaCO3 (s) -1206.92 CaO (s) -635.09 CO (g) -110.

Which is a non renewable resource that is used to generate electrical energy

How many grams of sulfur (S8S8) must be dissolved in 100.0 g naphthalene (C10H8C10H8) to make a 0.11 mm solution

Mason compare the properties of two compounds magnesium oxide is an ionic compound and hydrogen peroxide is not an ionic compound there for both compounds most likely

Cisplatin is synthesized as follows: K2PtCl4 (aq) + 2NH3 (aq)  Pt (NH3) 2Cl2 (s) + 2KCl (aq) What mass of cisplatin can be made from 100. g of K2PtCl4 and sufficient NH3? What mass of KCl is also produced?

What is the total number of protons in the nucleus of an atom of potassium-42? (1) 15 (3) 39 (2) 19 (4) 42