Practice Semester 2 Final

At n=1 the total number of electrons that could be found is

2

The electron notation for aluminum (atomic # 13) is

1s², 2s², 2p⁶, 3s², 3p¹

What is the oxidation number of a pure element

0

Which of these measurements has only non-significant zeros

0.0037 mL

Which of the following lists atomic orbitals in the correct order they are filled according to the Aufbau Principle?

1 s, 2 s, 2 p, 3 s, 3 p, 4 s, 3 d, 4 p, 5 s

Which coefficients correctly balance the formula equation CaO + H₂O → Ca(OH)₂

1,1,1

The pH of a solution is 10.00 what is its OH concentration

1.0 x 10 ⁻⁴ M

Which expression represents the concentration of H₂O⁺ ions in solution

10 ^⁻¹⁴ / [OH⁻]

What is the pH of a 0.027 M KOH solution

12.43

For the reaction represented by the equation 2Na + 2H₂O → 2NaOH + H₂, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?

120 g

Chlorine has an atomic number of 17 and mass number 35, it has

17 protons, 17 electrons, and 18 neutrons

For the reaction represented by the equation Cl₂ + 2KBr → 2KCl + Br₂, how many grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide?

188g

Which equation is not balanced?

2 H₂ + O₂ → H₂O

The molar mass of NO₂ is 46.01 g/mol. How many moles of NO₂ are present in 114.95 g?

2.498 mol

The reaction represented by the equation C + 2H₂ → CH₄, how many moles of hydrogen are required to produce 10 mol of methane, CH₄?

20 mol

Which of the following is the right side of the equation for dissolving K₂S(s)?

2K⁺(aq) + S²⁻(aq)

The number of significant figures in the measurement 0.000305 kg is

3

When 5.7 m is divided by 2 s, the quotient that is correctly reported is

3 m/s

How many atoms of fluorine are present in a molecule of carbon tetraclouride, CF₄

4

If [H₃O⁺]=8.26x10⁻⁵ M what is the pH of the solution?

4.083

What is the percentage composition of CuCl₂

47.27% Copper, 52.73% Chlorine

In the reaction represented by the equation 2Al₂O₃ → 4Al + 3O₂, what is the mole ratio of aluminum to oxygen

4:3

How many moles of ions are produced by the dissociation of 1 mol of Al₂(CO₃)₂?

5 mol

The number of grams equal to 0.5 kg is

500. g

A sample of oxygen occupies 560. mL when the pressure is 800.00 mm Hg. At constant temperature, what volume does the gas occupy when the pressure decrease to 700.00 mm Hg

640 mL

The volume of a gas is 93. mL, when the temperature is 91°C. If the temperature is reduced to 0°C without changing the pressure, what is the new volume of the gas?

70 mL

When a solid produced by a chemical reaction separates from the solution it is called

A precipiate

A compound is

A substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances

The elements in Group 1 are also known as the

Alkali metals

Name the compound Al₂S₃

Aluminum Sulfide

A spherical electron cloud surrounding an atomic nucleus would best represent

An s orbital

The most characteristic property of the noble gases is that they

Are largely unreactive

Evidence gathered since Mendeleev's time indicated that a better arrangement than atomic mass for elements in the periodic table is an arrangement by

Atomic gases

The total number of protons and neutrons in the nucleus of an atom is its

Atomic number

Dalton's atomic theory agrees with modern atomic theory except for the statement that

Atoms are not divided in chemical reactions

The number of atoms in a mole of any pure substance is called

Avogadro's number

Acids react with

Bases to produce salts and water

A positive ion is known as a(n)

Cation

Nuclear forces exist because the particles in the nucleus are

Close together

To balance a chemical equation, it may be necessary to adjust the

Coefficents

Which of the following pairs of solutions produces a precipitate when combined?

Cu(NO₃)₂ and K₂CO₃

A compound's empirical formula is CH. If the formula mass is 29 amu, what is the molecular formula?

C₂H₂

The molecular formula for vitamin C is C₆H₈O₆. What is the empirical formula

C₃H₄O₃

In what kind of reaction does a single compound produce two or more simpler substances?

Decomposition reaction

In a row in the periodic table, as the atomic number increases, the atomic radius generally

Decreases

The equation AX + BY → AY + BX is the general equation for a

Double- Displacement reaction

When an electron is acquired by a neutral atom, the energy change is called

Electron affinity

A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound is called

Electron configuration

In metallic bonds, the mobile electrons surrounding the positive ions are called a(n)

Electron sea

An electron for which n=4 more _____ than an electron for which n=2

Energy

For an electron in an atom to change from the ground state to an excited state?

Energy must be absorbed

Which reactant controls the amount of product formed in a chemical reaction?

Excess reactant

A physical change occurs when a

Glue gun melts a glue stick

If electrons in an atom have the lowest possible energies, the atom is in the

Ground state

The vertical columns of the periodic table are called

Groups

The reason the boiling point of water is higher than the boiling point of hydrogen sulfide is partially explained by

Hydrogen bonding

In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is

H₂

Which of the following is not an oxyacid?

H₂O₂

Which of the following is a diprotic acid?

H₂SO₄

The formula for the hydronium ion (not the hydrogen ion) is

H₃O⁺

Dissolving HCl in water produces

H₃O⁺ and Cl⁻

The greater the electronegativity between two bonded atoms the greater the percentage of ____ in the bond.

Ionic character

A water solution whose pH is 4

Is always acidic

The symbols for units of length in order from largest to smallest are

Km, m, cm, mm

In drawing a Lewis structure, the central atom is generally the

Least electronegative atom

Matter includes all of the following except

Light

Use VESPR theory to predict the shape of the hydrogen chloride molecule, HCl

Linear

If electromagnetic radiation A has a lower frequency that electromagnetic radiation B then compared to B, the wavelength of A is...

Longer

Isotopes are atoms of the same element that have different

Masses

The average atomic mass of an element is the average of the atomic masses of its

Naturally occurring isotopes

Argon, Krypton, and Xenon are

Noble gases

Experiments with cathode rays led to the discovery of the

Nucleus

Most of the volume of an atom is occupied by the

Nucleus

A three dimensional region around a nucleus where an electron may be found

Orbital

The set of orbitals that are dumbbell shaped and directed along the x,y,z axes are called

P orbitals

What is the formula for the compound formed by lead (II) ions and chromate ions?

PbCrO₄

According to Bohr, electrons cannot reside at ____ in the figure below

Point C (Between two orbitals)

If repeated measurements agree closely but differ widely from the accepted value, these measurements are

Precise, but not accurate

What does the constant bombardment of gas molecules against the inside walls of a container produce

Pressure

The reaction represented by the equation Cl₂(g) + 2KBr(aq) + Br₂(l) is a(n)

Single-displacement reaction

Visible light, X-rays, infrared radiation, and radio waves all have the same

Speed

A substance that ionizes nearly completely in aqueous solutions and produces H₃O⁺ is a

Strong acid

The reaction represented by the equation 2Mg(s) + O₂(g) → 2MgO(s) is a

Synthesis reaction

The statement that no two electrons in the same atom can have the same four quantum numbers is

The Pauli Exclusion Principle

If the percentage yield is equal to 100% then

The actual yield is equal to the theoretical yield

Which of the following observations is quantitative?

The liquid boils at 100°C

An atom is

The smallest unit of matter that maintains its chemical identity

Mendeleev predicted that the spaces in his periodic table represented

Undiscovered elements

The electrons available to be lost, gained, or shared when atoms form compounds are called

Valence electrons

Under ordinary conditions of temperature and pressure, the particles in a gas are,

Very far away from one another

Pure water contains?

Water molecules, hydronium ions, and hydroxide ions

Name the compound Zn₃(PO₄)₂

Zinc Phosphate

What is the formula for Zinc Fluoride

ZnF₂

If a mixture in composition, it is said to be

homogeneous

The units of molar mass are

g/mol

If two covalently bonded atoms are identical, the bond is

nonploar covalent

The letter designations for the first four sublevels with the maximum number of electrons that can be accommodated in each sublevel are

s:2, p:6, d:10, and f:14

The two most important properties of all matter are

taking up space and having mass