chem EOC review

Which element has the electron configuration 1s2 2s2 2p6 3s2 3p4

Sulfur

An important result of the Rutherfords experiment with gold foil was to find that

The atom is mostly empty Space.

A measurement of 23,456 mg converted to grams equals

23.456 g

The atomic mass or mass number of an element is the same as the number of

Protons+neutrons

Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. What are the reactants?

Magnesium and hydrochloric acid

Wait, which is the true of the quantum theory model of the atom (the cloud model)?

Orbitals represent areas where the electron is likely to be

Which element has the noble gas notation?[Kr]5s2 4d2

Zr

A metal sample has a mass of 45.65 g. The volume of the sample is 16.9 cm³. The density of the sample is.

2.7 g/cm³

The atomic number of an element is the same number of

Protons

Three of the following must contain two or more kinds of atoms. Which does not contain two or more kinds of atoms?

Homogeneous mixture, element, compound, heterogeneous

The noble gases are not reactive and are always found isolated (unbounded) in nature. This is because…

They have eight valence electrons and a full outer shell

When numbers are multiplied or divided the answers can have no more…

Sig figs that are in the measurement that has the least number of sig figs

Which of the following symbols does not match the element name given?

Co, Cobalt

How many moles of carbon are in a 28.0 g sample

2.33 mol

How many total electrons are in an atom of N³-

-10

What is the maximum number of electrons that can occupy a 3S orbital?

2

Murder can be defined as anything that

Has mass and volume

Which of the following measurements contains three significant figure figures

20.2 mL

We know that error is a mixture, not a compound

It’s composition can vary

How many neutrons are present in an atom of tin that has an atomic number of 50 in the mass number of 119

69

What happens to the atoms in a chemical reaction?

The same number and type of atoms that go in must come out

Which subatomic particle has the least mass

Electron

Elements that are found in the lanthanides in actinides correspond to which of the following orbitals

F

Group 17 the halogens are the most reactive nonmetal elements because they

Require only one electron to fill their outer energy level

which isotope of uranium will have the greater number of neutrons

U-238

When balancing a chemical equation you are allowed to change

Coefficient only

When metals form binds, they tend to

Give us electrons forming cations

The accuracy of a measurement

Is how close it is to the true value

Which two elements are more likely to have the same charge on their eye

Ca and Rb, Sn and Si, Se and As, and I and Xe

The molecular formula for acetylene is C2 H2. The molecular formula for benzene is C6H6. The empirical formula for both is.

CH

As you move, left to right across . Three from Mg to Cl, the energy needed to remove an electron

Generally increase increases

Which best describes energy in a chemical reaction

Breaking bonds absorbs energy; forming bonds releases energy

A precipitation reaction

Two aqueous ions form an insoluble solid

Which of the following compounds is predicted to have the highest building point

CaF2

An endothermic reaction is

Absorbs heat from the surroundings

The lowest structure for CH4 contain

Four single bonds

Which of the following compounds does not contain a polyatomic ion?

Sodium sulfide

A double displacement reaction generally has the form

AB+CD→AD+CB

It compound is an excellent electrical conductor in the solid state and is malleable. What type of font does it exhibit

Metallic

A chemical bond results from the mutual attraction of the nuclei for

Electrons

A substance that dissolves in water to produce ions and conduct electricity is called

An electrolyte

The lowest structure for HCN contains

One triple bond, and one single bond

Which of the following has the highest electrical negativity?

Fluorine

In an exothermic reaction, the temperature of the surroundings

Increases

When an ionic compound dissolves in water, it

Disassociates into ions

A balanced chemical equation must have

The same number of each type of atom on both sides

A polar covalent bond is likely to form between two atoms that

Differ in electronegativity

How many electrons are shared between atoms in a triple bond between atoms and a covalent bond

Six

Which type of bond is formed when atoms transfer electrons from one atom to another, creating a cation and an anion

Ionic bonds

Which of the following shows a percentage of the composition H2SO4?

2.1% H, 32.7% S, 65.2%O

The empirical formula for 1.2% H, 42.0% CL, and 56.8% O is

HClO3

According to VSEPR theory the molecular geometry of CH4 is

Tetrahedral

Which combination will form a precipitate

AgNO3+NACL(aq)

The correct formula for iron (lll) oxide is

Fe2O3

The correct name for NH4C22H3O2 is

Ammonium acetate