Rank the elements b, be, n, c, and o in order of increasing first ionization energy. (use the appropriate symbol to separate substances in the list.)

Convert 829 cm into km

Which of the following statements about the atom is false? a. Each atom has a tiny nucleus at its center. b. All the protons and neutrons are located in the nucleus. c. Electrons travel in definite circular pathways around the nucleus. d.

What is one example of a response? the angle of the sun changing during the day outside temperature dropping at night ivy growing around the pole of a fence water lost from the lungs during breathing

1. A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - > CaSO4 + 2HF The chemist uses 11 g of CaFz and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Solve 2v^2-90=0, where v is a real number

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams

What would you use if you needed to determine the density of an object? balance and graduated cylinder balance and scale scale and spectroscope

What are two forms of friction that oppose the motion of a moving car

How are models related to theories and hypotheses