CHEM 135 - Exam 1 Review Questions

<p>Iron (C)</p> Signup and view all the answers

<p>Fe2+ (A)</p> Signup and view all the answers

<p>6 pages (C)</p> Signup and view all the answers

<p>The exam will be voided (A)</p> Signup and view all the answers

<p>Only in the space provided (A)</p> Signup and view all the answers

<p>Put their pencil down and remain in their desk (D)</p> Signup and view all the answers

<p>10 points (C)</p> Signup and view all the answers

<p>The Periodic Table of the Elements (B)</p> Signup and view all the answers

<p>Scratch paper must be blank pages in the exam (A)</p> Signup and view all the answers

<p>Write their name and sign (B)</p> Signup and view all the answers

<p>Sodium hypochlorite (B)</p> Signup and view all the answers

<p>3s (C)</p> Signup and view all the answers

<p>845 nm (A)</p> Signup and view all the answers

<p>2p (A)</p> Signup and view all the answers

<p>Aluminum bisulfate (A)</p> Signup and view all the answers

<p>3d (D)</p> Signup and view all the answers

<p>2 (D)</p> Signup and view all the answers

<p>[Ar]4s2 3d10 4p0 (B)</p> Signup and view all the answers

<p>Ne, Al, Ca (C)</p> Signup and view all the answers

<p>I- (A)</p> Signup and view all the answers

<p>F, H, Ne (D)</p> Signup and view all the answers

<p>Li (A)</p> Signup and view all the answers

<p>C14H8O4 (A)</p> Signup and view all the answers

<p>E = hν (B)</p> Signup and view all the answers

<p>Atomic mass = ∑(isotope abundance × atomic mass) / 100% (A)</p> Signup and view all the answers

<p>From n=4 to n=1 (A)</p> Signup and view all the answers

<p>Calcium (Ca) (B)</p> Signup and view all the answers

<p>kJ/mol (C)</p> Signup and view all the answers

<p>Decreases across a period (D)</p> Signup and view all the answers

<p>Increase across a period (A)</p> Signup and view all the answers

<p>Covalent bond (B)</p> Signup and view all the answers

<p>n=1 (D)</p> Signup and view all the answers

<p>Electron (B)</p> Signup and view all the answers

Bismuth (Bi) is a metal.

Helium (He) is a non-metal.

Silicon dioxide (SiO2) is a covalent substance.

Ozone (O3) is a covalent substance.

Beryllium fluoride (BeF2) is a compound and a covalent substance.

Graphene is a covalent substance.

A substance formed from two or more elements chemically bonded.

A substance whose atoms are held together by sharing electron pairs.

Fluorine-18 has 9 protons, 9 electrons, and 9 neutrons.

Given protons=23, electrons=21, and neutrons=30, determine the formula AXn, where A is the element symbol which corresponds to the number of protons, and n is the charge(which is the difference between the number of protons and electrons)

Calculate the moles of hydrogen atoms present in 1.00 g of NH3BH3 given a molar mass of 30.87 amu for NH3BH3.

Convert 1 atomic mass unit (amu) to grams using the definition of the mole and the atomic mass unit (amu), and physical constants.

Determine the element in a 10.0g sample containing 4.39 x 10^22 atoms, using the relationship between mass and number of atoms.

Barium peroxide is an inorganic compound with the chemical formula BaO2. It is a white or pale yellow solid, and a powerful oxidizing agent.

Sodium hypochlorite (NaClO) is the active ingredient in many household bleach products.

Copper(II) fluoride is a white solid with the chemical formula CuF2.

Germanium tetrachloride is a colorless, fuming liquid with the chemical formula GeCl4.

Aluminum hydrogen sulfate is a chemical compound with the formula AlH(SO4)2. It is a white solid that is soluble in water.

The maximum wavelength of light that can ionize an atom is determined by its first ionization energy (IE). The energy of the light (E = hc/λ) should be equal to the ionization energy.

The quantum numbers for a 4dxy orbital are n=4, l=2, ml=0, and ms=±1/2. The value of ml=0 indicates that the orbital is oriented along the x and y axes.

An atomic orbital with 2 nodal planes corresponds to a d orbital (l = 2). The designation for this orbital depends on the specific nodal plane orientations.

Atomic radius increases down a group and decreases across a period.

Moving down a group, electrons are added to higher energy levels, further from the nucleus.

Moving across a period, the number of protons increases, pulling electrons closer to the nucleus.

Ionic radius of an anion is larger than its corresponding atom.

Ionic radius of a cation is smaller than its corresponding atom.

Electron affinity generally increases across a period and decreases down a group (with exceptions).

Moving across a period, the nuclear charge increases, making it easier to attract electrons.

Moving down a group, electrons are added to higher energy levels further from the nucleus.

Ionization energy generally increases across a period and decreases down a group.

Moving across a period, the nuclear charge increases, making it harder to remove electrons.

Moving down a group, electrons are added to higher energy levels, further from the nucleus.

The simplest whole-number ratio of atoms in a compound.

1. Convert mass percentages to grams. 2. Convert grams to moles. 3. Divide each mole value by the smallest mole value. 4. Round to the nearest whole number.

Assume a 100 g sample, so the mass percentage directly translates to grams.

Use the molar mass of each element to convert grams to moles.