Calcium (Ca) has an atomic number of 20. What is calcium's ground-state electron configuration? 1s21p61d101f2 1s21p62s22p63s23p2 1s22s22p63s23p64s2 1s22s22p63s23p63d2

What kind of materials can become electrically charged when they are rubbed together?

How is homogeneous and heterogeneous alike?

Which is caused by gravity? A. aeolian bands B. frost wedging C. glaciation D. mass wasting

What is meant by solvation? nonpolar solute surrounded by polar solvent polar solute surrounded by nonpolar solvent ionic solute surrounded by nonpolar solvent ionic solute surrounded by polar solvent

Elements in the halogen group are a. very reactive b. have seven electrons in the outer shell c. react to form salts d. all of the above

Which of the following equilibria would be impacted by a change in pressure? Select the correct answer below: H2 (g) + I2 (g) →2HI (g) NO (g) + O3 (g) →NO2 (g) + O2 (g) 2SO3 (g) →2SO2 (g) + O2 (g) CO (g) + H2O (g) →CO2 (g) + H2

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed? 15.0 mL 66.

A chemical reaction that takes in heat is called: exothermic endothermic a phase change

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line

63Ni decays by a first-order process via the emission of a beta particle. The 63Ni isotope has a half-life of 100. years. How long will it take for 65% of the nickel to undergo decay?