Chemistryacademic

"Calculate the molar mass of SiO₂. Show your work by entering the atomic mass in the proper boxes. Molar mass of SiO₂ = ... g/mol Si + 2 * ... g/mol O = ... g/mol SiO₂ (total)"

Water is often called the universal solvent because many different substances dissolve well in water. What causes water to dissolve so many substances? A. Water is a nonpolar molecule with no charged ends. B. Water is a covalent compound with no charged ends. C. Water is a polar molecule with positive and negative ends. D. Water is an ionic compound with positive and negative ends.

What is the Lewis structure for PCl5?

"For the HCl molecule: Draw the correct Lewis structure. Select all polar covalent bonds."

"What charge is most commonly observed for a nickel ion? A. +1 B. +2 C. -1 D. -2"

"Draw the Lewis structure for CH2 O2?

How many electrons, protons, and neutrons does gold have? How many protons, electrons, and neutrons are in an atom of gold?

"What is the Lewis structure of NH2+?"

What does Fe stand for in the Periodic Table of Elements?

What is the ionic charge for C, Si, Ge, Sn, and Pb?

Explain what a byproduct is and give an example of one not discussed in the unit.

"Which best defines concentration? A. Ratio that describes the amount of solute divided by the amount of solvent or solution B. Ratio that describes the amount of solvent or solution divided by the amount of solute C. Ratio that describes the mass of solute divided by the mass of solvent D. Ratio that describes the amount of solvent in a solution"

What is the correct Lewis structure for the sulfur atom?

Is milk a strong or weak acid or base?

"Which is the correct Lewis structure for hydrogen peroxide, H 2 ​ O 2 ​ ? Molecule structure option A has: An H atom with two electron dots on the left side with a single bond to O An O atom with an electron dot on top and bottom, with a single bond to another O atom with an electron dot on top and bottom A. a B. b C. c D. d E. e"

"Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3 . A) eg = trigonal pyramidal, mg = bent, nonpolar B) eg = tetrahedral, mg = tetrahedral, nonpolar C) eg = trigonal bipyramidal, mg = trigonal pyramidal, nonpolar D) eg = tetrahedral, mg = trigonal pyramidal, polar E) eg = trigonal planar, mg = trigonal planar, nonpolar"

"How many protons, electrons, and neutrons, respectively, does 31 P have?"

"What is the molar mass of PbCO 3 ​ ?"

"Select the electron domain geometry and the molecular geometry for an ammonia molecule, NH₃. Check all of the boxes that apply. trigonal-planar electron domain geometry trigonal-planar molecular geometry trigonal-pyramidal electron domain geometry trigonal-pyramidal molecular geometry tetrahedral electron domain geometry tetrahedral molecular geometry"

"What is the molecular shape of water (H2O)? A) Linear B) Tetrahedral C) Trigonal Pyramidal D) Bent E) Trigonal Planar"

"How do you find the pounds per gallon of a chemical? A) Divide the molecular weight of the chemical by its specific gravity B) Multiply the specific gravity of the chemical by its density C) Divide the density of the chemical by its molecular weight D) Multiply the molecular weight of the chemical by its specific gravity"

Is boiling water a physical change or a chemical change?

What is the correct Lewis dot structure for chlorine (Cl)?

How much is 2.4 micrograms of vitamin B12 in mg?

"The electron geometry and molecular geometry of a water (H2O) molecule are, respectively: Select one: tetrahedral, tetrahedral trigonal planar, trigonal planar tetrahedral, bent trigonal planar, bent"

"An atom with 6 protons, 7 neutrons, and 6 electrons shares four pairs of electrons with four other atoms. This atom is now considered to be: a) A cation b) An anion c) An isotope d) A covalent compound"

What is the molar mass of bromine?

"Of these molecules, the bond in ____ is most polar: A. HBr B. HI C. HCl D. HF E. H₂"

"The anion O3− does not obey the octet rule. Draw its Lewis structure. State the type of octet-rule exception. Indicate the values of nonzero formal charges. Include lone pair electrons."

"Determine the electron geometry, molecular geometry, and idealized bond angles for each of the following molecules: a. CF4 ​b. NF3 ​c. OF2 ​d. H2S"

"Determine the electron geometry (eg) and molecular geometry (mg) of XeF₂. A. eg = trigonal bipyramidal, mg = bent B. eg = linear, mg = linear C. eg = tetrahedral, mg = linear D. eg = trigonal bipyramidal, mg = linear E. eg = tetrahedral, mg = bent "

How many protons, neutrons, and electrons are present in an atom of argon (Ar) with a mass number of 40? A. 18 protons, 22 neutrons, 18 electrons B. 18 protons, 40 neutrons, 22 electrons C. 22 protons, 18 neutrons, 22 electrons D. 40 protons, 58 neutrons, 18 electrons

What is the formula for water vapor?

How many protons, neutrons, and electrons does a potassium-39 atom contain?

Which elements listed below are most likely to form anions? Select all that apply. A. Lithium (Li) B. Calcium (Ca) C. Sulfur (S) D. Fluorine (F)

What is the charge of a chlorine ion that has gained 1 electron?

"Looking at the periodic table, determine the number of valence electrons present in potassium (K). 3 valence electrons 4 valence electrons 2 valence electrons 1 valence electron"

"What visible signs indicate a precipitation reaction when two solutions are mixed? Select one or more: A. A hazy or cloudy appearance B. Solid settling out in the test tube C. A color change D. Bubbling in the test tube"

Does hydrogen have 1 or 2 valence electrons?

"An electronegativity difference ≥ 1.7 indicates an ________ (sometimes you see 2.0 instead of 1.7). An electronegativity difference ≤ 0.5 is generally considered ___________. If it is somewhere in the middle, it is considered ________. ionic bond, covalent bond, polar covalent bond ionic bond, polar covalent bond, covalent bond covalent bond, ionic bond, polar covalent bond covalent bond, polar covalent bond, ionic bond"