A. Which statement accurately describes part of the dissolving process of a polar solute in water? B. Solute molecules repel water molecules. C. Water molecules surround solute molecules. D. Water molecules are strongly attracted to nonpolar substances. Solute molecules remain concentrated in one part of the solvent.
Explain how the understanding of atomic emission spectrum led to development of the atomic theory? ( 4 points)
Find the separation of the 14n and 15n isotopes at the detector. express your answer with the appropriate units.
Magnesium nitrate contains chemical bonds that are A) covalent, only B) ionic, only C) both covalent and ionic D) neither covalent nor ionic
As gravity makes an object fall down toward the ground, ____ energy becomes kinetic energy. A. Chemical B. Electromagnetic C. Potential D. Thermal
Determine the molar solubility of pbso4 in pure water. ksp (pbso4) = 1.82 x 10-8. a. 1.82 x 10-8 m b. 1.35 x 10-4 m
Which energy position do electrons generally want to be in? the ground state the excited state the highest possible energy level the medium energy level
What is the wavelength of the line corresponding to n=4 in the balmer series? express your answer in nanometers to three significant figures?
A 1170 gram sample of nacl completely reacts, producing 460 grams Na what is the total mass of cl2 produced
Mixtures can be separated by filtration and distillation. Both methods take advantage of_______. A. differences in the chemical properties of the mixtures's components. B. differences in the physical properties of the mixture's components. C. similarities in the chemical properties of the mixture's components. D. similarities in the physical properties of the mixture's components
Calculate the concentration of so42− ions in a 0.010 m aqueous solution of sulfuric acid. express your answer to four decimal places and include the appropriate units.
Which of the following atoms would lose three electrons to empty its valence energy level? . A] Al B] S C] N, D] Sc.
Complete the lewis structures of the atoms and ions by adding electrons, as needed. a) Li B) Na C) Na+ D) F-
What happens to colors in sunlight when droplets of water in the atmosphere act like prisms? A. dispersion B. polarization C. absorption D. interference
Why is a chemical equilibrium described as dynamic? Because maximum randomness has been achieved. Because the pressure and temperature do not change. Because both reactants and products continue to form. Because the concentrations of chemical species remain constant. Because the reactant and product molecules are in constant motion.
A. draw the structure of the tetrahedral intermediate initially-formed in the reaction shown. reactions of esters with
Which of the following factors can lead to desertification in the presence of natural drought? a. deforestation b. sustainable grazing c. underground mining d. all of the above
Oxygen, sulfur, and tungsten are all examples of what type of matter? compound element heterogeneous mixture solution
In Klinefelter syndrome males have chromosomes XXY. This is an example of: a. Non-disjunction of sex chromosomes b. Crossing over c. Chromosomal rearrangement