What is the electron configuration of an element with atomic number 20?

Calculate the volume of 2.5*10-4 moles of h2

Which of the following will affect the rate of a chemical reaction? 1) solvent concentration 2) solution volume 3) solute mass 4) solute concentration

To what volume will a sample of gas expand if it is heated from 50.0∘c and 2.33 l to 500.0°c?

Which particle is a neutron most equal to in mass? A. a molecule B. an atom C. a proton D. an electron

Which is the least likely result of selective breeding A) Different breeds of cats B) Different breeds of dogs C) Different varieties of weeds D) Different varieties of vegetables

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