Chemistryacademic

K is the abbreviation for calcium. A. True B. False

How can you tell if a chemical equation represents hydrolysis?

What would the charge be on an ion of selenium (Se)?

Which of the following atoms is diamagnetic in the ground electronic state? A. S B. Mn C. I D. Sr

What is the formula for nitrogen trihydride?

An atom of titanium has an atomic number of 22 and a mass number of 49. Calculate the number of protons and neutrons in this atom. If the atom of titanium is neutral, how many electrons are in the atom?

What type of bond exists between hydrogen and chlorine in HCl (hydrochloric acid)? How do you know this?

What is the molar mass of KClO₃?

What is the electron configuration for bismuth (Bi)?

Is buttermilk an example of a homogeneous or heterogeneous mixture?

Is fluorine a metal or a nonmetal? How many valence electrons does a fluorine atom have?

Which of the following is the Lewis dot structure for Silicon (Si)? A. Si B. Si:

How many valence electrons are there in the valence shell of sodium, Na (atomic number 11)? A. three B. one C. two D. four

Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have? A. 19 B. 58 C. 20 D. 39

What is the process to convert moles into grams?

Which type of bond has an electronegativity difference greater than 1.7? A. ionic B. metallic C. nonpolar covalent D. polar covalent

The radius of an atom of gold (Au) is about 1.35 Å (angstrom). a. Express this distance in nanometers (nm) and in picometers (pm). b. How many gold atoms would have to be lined up to span 1.0 mm? c. If the atom is assumed to be a sphere, what is the volume in cm3 of a single Au atom?

Write the formula for the following covalent compound: phosphorus triiodide.

We recognize acids when we see a(n) ______ with an anion. The name of the acid is derived from the name of its ______. An ate anion, like nitrate, forms an acid named ______. Sulfurous acid (H2SO3) is formed from a ______ ion. a. Positive ion b. Negative ion c. Neutral ion d. Not mentioned

Which properties are most common in nonmetals?

What are the electron and molecular geometries, respectively, for hydrogen sulfide (H₂S)? A. Electron geometry is linear; molecular geometry is bent. B. Electron geometry is tetrahedral; molecular geometry is linear. C. Electron geometry is tetrahedral; molecular geometry is bent. D. Electron geometry is bent; molecular geometry is tetrahedral.

What is the pOH equation? How can pOH be determined from pH?

What is the electron group geometry and molecular geometry, respectively, for the molecule XeF2? A. trigonal bipyramidal, linear B. trigonal bipyramidal, bent C. tetrahedral, bent D. octahedral, bent E. octahedral, linear

What is the molecular geometry around nitrogen in CH3NH2?

What do the horizontal rows on the periodic table represent?

Calculate the mass of forsterite (Mg2SiO4) that contains a billion (1.000×109) oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

Calculate the molar mass of magnesium sulfate heptahydrate, MgSO4 ⋅7H2O.

How would you calculate the formal charge of NH3 ?

When a potassium atom loses one electron to form a K+ ion, the electron is lost from what orbital?

What are some properties that all combustion reactions have in common?

What are the two ways to write the formula for a proton?

1. Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Mg2+,V5+,Br−,S2− 1. MgBr2 2. MgS 3. VBr5 4. VS2

Which is the correct Lewis structure for the K+ ion?

Which of these compounds contain elements that do not follow the octet rule? A. NF3 B. PCl2F3 C. SF4 D. SCl2

How many valence electrons does krypton have? A) 6 B) 8 C) 10 D) 18

A pH change can be evidence that A. a substance has changed physically. B. a substance's state of matter has changed. C. no change has taken place. D. a substance has changed chemically.

How many valence electrons does magnesium have? Type in the correct values to represent the valence electron configuration. A. __________ B. __________ What is the charge of a magnesium ion? A. __________

How many double bonds are in the Lewis structure for hydrogen fluoride, HF?

What is the pOH of a solution with a pH of 8?

"Which of the following molecules would violate the octet rule due to having odd numbers of electrons? A. OH B. NO₂⁺ C. NO D. SO₂ E. ClO₂⁻ F. ClO"