Chemistry Homework Assistance
QuestionAI's chemistry problem solver is a middle school chemistry tutoring tool that summarises key chemical reactions and equations in real-time, featuring a robust learning system to empower even those with a weak foundation in chemistry.
You needn't fret over the elemental properties of the periodic table anymore. Here, you can effortlessly access chemical reactions and reaction principles corresponding to each element. Deductive reasoning from microscopic phenomena to discern the original structure of molecules and atoms is a research technique we staunchly champion.
- How did Mendeleev improve upon Newland's arrangement of the CHEMICAL ELEMENTS? He arranged elements in order of the number of electrons in their outer shell so that elements of SIMILAR MASS appeared in columns He kept elements in order of atomic mass but added "made-up' elements in the pattern so that those with SIMILAR PROPERTIES appeared in the same groups He swapped COLUMNS for ROWS and hoped for the best He kept elements in order of atomic mass but, where necessary, inserted spaces in the pattern so that those with SIMILAR PROPERTIES appeared in the same groups
- METALS tend to appear In which part of the PERIODIC TABLE? At the TOP of the table only The RIGHT side (actually taking up most of the table) In the separate section at the BOTTOM only The LEFT side (actually taking up most of the table)
- 20. Which element has a 4s^2 a. Vanadium b. Titanium c. Scandium d. Chromium
- . Which of the following is not a nonpolar amino acid? A . isoleucine B . valine C . methionine D . arginine 2.Which of the following amino acids lacks an asymmetric carbon atom? A . serine B . glycine C . histidine D . glutamine 3 . The type of bond holding the amino acid units together in a dipeptide molecule is called: A. a glycosidic bond B. an ester bond C. a peptide bond D. a protein bond 4 . Peptide bonds , which covalently link two amino acids , result from A. the oxidation of amino acids. B. the condensation of amino acids. C. the hydrolysis of amino acids. D . hydrogen bonds between amino acids.
- 1. Diketahui campuran 100 mL larutan NH_(4)OH 0,5 M dengan 50 mL larutan NH_(4)Cl 0,2 M (K_(b)NH_(4)OH=1,8times 10^-5) a. Hitunglah nilai pH campuran tersebut. b. Jika campuran tersebut ditambahkan 1 mL larutan HCI 1 M tentukan pH campurannya. c. Jika campuran tersebut ditambahkan 1 mL larutan NaOH 1 M tentukan pH campurannya.