Chemistry Final Exam

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In an equation, the symbol for a substance in water solution is followed by

(Aq)

Which of the following is the functional group in alcohols?

-OH

The measurement 0.035550 g rounded off to two sig figs would be

0.036

Which of the measurements has been expressed to three significant figures?

0.202 g

For the reaction by the equation Pb(NO3)2 + 2KI2 + 2KNO3 , how many moles of lead(II) iodide are produced from 300 g of potassium iodide and an excess of Pb(NO3)2?

0.904 mol

Which coefficients correctly balance the formula equation CaCo,(s)- Cao(s)+ CO(g)?

1,1,1

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

1,1,1

How many molecules are in 2.10 mol CO2?

1.26 x 10^24

How many moles of glucose, C6H12O6, can be "burned" biologically when 10.0 mol of oxygen is available?

1.67 mol

For the reaction represented by the equation 2H2 +O2 = 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108 g

For the reaction represented by the equation 2H2O + O2 = 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?

12 mol

For the reaction represented by the equation 2Na + 2H20 = 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?

120 g

What is the percentage composition of CF4?

13.6% C, 86.4% F

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. The density of gold is

19.3 g/cm

In the reaction represented by the equation N2 +3H 2NHs, what is the mole ratio of nutrogen to ammonia?

1:2

What is the electron configuration for nitrogen, atomic number 7?

1s2 2s2 2p3

The electron notation for aluminum (atomic number 13) is

1s2 2s2 2p6 3s2 3p

Which of the following electron configurations belongs to an element that is NOT chemically reactice?

1s2 2s2 2p6 3s2 3p6

Which coefficients correctly balance the formula NH4NO2 -> N2 + H2O?

2,2,2

How many atoms are in 3.5 moles of arsenic atoms?

2.1 x 10^24 atoms

What is the mass of silver in 3.4 g AgNO3?

2.2 grams

For 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

Methane (CH4) contains 75% carbon. What percentage of methane is hydrogen?

25%

What is the balanced equatiok when aluminum reacts with copper (II) sulfate?

2AL + 3CuSO4 = AL2(SO4)3 + 3Cu

Which equation is NOT balanced?

2h2 + O2 = H2O

The electron configuration of nitrigen js 1s^2 2s^2 2p^3. How mang more electrons does nitrogen need to satisfy the octet rule?

3

The number of significant figures in the meaurement 0.000 305 kg is

3

The Haber process for producing ammonia commercially is represented by the equation N68)+3H(g)> 2NH (2). To completely convert 9.0 mol hydrogen gas to ammonia gas, how moles of nitrogen gas required?

3.0 mol

How many moles of silver atoms are in 1.8 x 10^20 atoms of silver?

3.0 x 10^-4

You calculate that 319 000 000 m is the answer to a problem. You are asked to write your answer in scientific notation. Which answer is correct?

3.19 x 10^8

Which of these measurements has been expressed to four significant figures?

30.00 mm

What is the molar mass of AuCl3?

303.6 g

The mass of 2.0 mol of oxygen atoms (atomic mass 16.00 anu) is

32 g

In the reaction reperesented by the equation N2 + 3H2 = 2NH3, what s the mole ratio of hydrogen to ammonia?

3:2

How many atoms of flourine are present in a molecule of carbon tetrafluoride, CF4?

4

How many outermost electrons does a carbon have?

4

What is the number of moles of beryllium atoms in 36 g of Be?

4.0 mol

The density of aluminum is 2.70 g/e. What is the mass of a solid piece of aluminum with a volume of 1.50 cm^3?

4.05 g

In the equation 2KClO3 → 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely?

4.5 mol

How many atoms are in 0.075 mol of titanium?

4.5 x 10^22

One mole of silicon (Si) has a mass of 28.086 g, and one mole of carbon has a mass of 12.011 g. What is the mass of one mole of silicon carbide (SiC)?

40.097 g

What is the percentage composition of CuCl2?

47.267% Cu, 52.733% Cl

In the reaction represented by the equation 2A120-4Al+302, what is the aluminum to oxygen?

4:3

The number of orbitals for the d sublevel is

5

What is the density of 37.72 g of material whose volume is 6.80 cm3?

5.55 g/cm

The percentage of sulfur in SO2 is about 50%. What is the percentage of oxygen in this compound?

50%

For the reaction represented by the equation 2Fe = O2 = 2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen?

575 g

The atomic sublevel with the next highest energy after 4p is

5s

How many carbons are in a molecule of hexane?

6

The electron configuration for the carbon atom (C) is 1s^2 2s^2 2p^2. The atomic number of carbon is

6

The number of atoms in 1 mol of carbon is

6.022 x 10^23

For the reaction by the equation CH4 + 2O2 = CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100 g of methane?

6.23 mol

Using a periodic table, what is the average atomic mass of zinc?

65.39 amu

The mass of 5.000 mol of cesium (atomic mass 132.9 amu) is

664.5 g

What is the mass in grams of 5.90 mol C8H18?

673 g

kg is . For the reaction represented equation AgNO, + NacI- NaNO, + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO?

7.0 mol

When the equation FE3O4 + AL = Al2O3 is correctly balanced, what is the coefficient of Fe?

9

If 1 inch equals 2.54 cm, how many centimeters equal 1 yard?

91.4 cm

What is the molar mass of (NH4)2 CO3?

96 g

A chemical change occurs when

A leaf changes color in the fall

A compound is

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

A measurement that closely agrees with an accepted value is the best described as

Accurate

What is the formula for aluminum sulfate?

Al2(SO4)3

d. ions In the equation 2Al(s) +3Fe(NOa)3Fe(s)+2AINO,)(aq), iron has been replaced by

Aluminum

A solution in which the solvent is water

Aqueous solution

All atoms of the same element have the same

Atomic number

What is the formula for barium hydroxide?

Ba(OH)2

Which instrument measures atompipheric pressure?

Barometer

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

C3H4O3

What is the formula of calcium phosphate, which is made up of ions Ca2+ and PO 4-3?

Ca3(PO4)2

What is the formula for the compound formed by calcium ions and chloride ions?

CaCl2

What do all organic compounds contain?

Carbon

A statement that uses chemical formulas to show the identities and amounts of the substances chemical reaction

Chemical equation

The process by which the atoms of one or more substances are rearranged to form different substances

Chemical reaction

A number written in front of a chemical formula

Coefficient

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

Coefficients

A reaction in which oxygen combines with a substance and releases heat and light energy

Combustion reaction

An equation that shows all of the particles solution as they actually exist

Complete ionic equation

What is the metallic ion in the compound CuCl2?

Cu2+

A reaction in which a compound breaks down into two or more elements or new compounds

Decomposition reaction

The reaction represented by the equation 2HgO = 2Hg + O2 is an

Decomposition reaction

In what kind of reaction does one element replace a similar element in a compund?

Displaement reaction

The density of an object is calculated by

Dividing its mass by volume

The reaction represented by the equation Pb(NOs)h(aą) + 2KI(aą)- Pblz(s)+2KNO,(aq) is

Double-displacemy reaction

A reaction involving the exchange of positive ions between two compounds dissolved in water

Double-replacement reaction

Percent yield of a product is a measure of a reaction's

Efficiency

What are shaped in a covalent bond?

Electrons

A mole of potassium chloride (KCL) contains 6.02 x 10^23

Formula units KCL

A physical change occurs when a

Glue gun melts a glue stick

The indium(II) ion and indium (III) ion

Have charges of 2+ and 3+

Name the compund Fe(NO3)2

Iron(II) nitrate

. You calculate that 213 000 m/s is the answer to problem. What can you conclude about your answer?

It has three significant figures

Matter includes all of the following except

Light

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

Limiting Reaction

Which of the following is NOT a chemical change?

Melting

Which of the following is a characteristic common to the transition metals?

Most are conductors of electricity and heat.

What is the formula for dinitrogen trioxide?

N2O3

An equation that includes only the particles that participate in the reaction

Net ionic equation

The branch of chemistry that focuses on carbon-containing chemicals is called

Organic chemistry

What is the formula for diphosphorus pentoxide?

P2O5

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

PbCrO4

A solid produced during a chemical reaction in a solution

Precipitate

A substance formed during a chemical reaction

Product

When the limiting reactant in a chemical completely used, the

Reaction stops

A numerical result is said to have good precision if

Repeated measurments agree closely

Which of the following observations is qualitative?

Salt crystals formed as a liquid evaporated.

In the formation of a covalent bond, electrons are

Shared

The element with electron configuration 1s2 2s2 2p6 3s2 3p2 is

Si (Z=14)

The equation A + BX = AX+B is the general equation for a

Single-displacement

The reaction represented by the equation Mg + 2HCL = H2 + MgCl2 is a

Single-displacement reacyion

A reaction in which the atoms of one element replace the atoms of another element in a compound

Single-replacemt reaction

Substance dissolved in a soulution

Solute

The most plentiful substance in a solution

Solvent

A reaction in which two or more substances react to produce a single product

Synthesis reaction

The equation A + X = AX is the general equation for a

Synthesis reaction

The reaction represented by the equation 2Mg ( s ) + O2 ( g ) - > 2Mg0 ( s ) is a

Synthesis reaction

In a chemical reaction

The mass of the reactants equals the mass of the products

The mole ratio of the elements in a compound's molecular formula is

The same as the mole ratio of the elements in its empirical formula

An atom is

The smallest unit of matter that maintains its chemical identity

Which of the following is NOT matter?

Ultraviolet radiation

The unit m^3 measures

Volume

A molecular compound has the empirical formula XY3. Which of the following is a possible molecular formula?

X2Y6

Name the compound Zn3(PO4)2

Zinc phosphate

What is the small whole number that appears in front of a formula in a chemical equation?

a coefficient

What is the measured amount of a product obtained from a chemical reaction?

actual yield

Mole ratios for a reaction are obtained from the

balanced chemical equations

According to VSEPR theory, the molecular shape of H2O is classified as

bent

According to VSPER theory,which of the following shapes is possible for a molecule with the molecular formula of AB2?

bent and linear

Which of the following is NOT a physical change?

burning

Name the compound CF4.

carbon tetrflouride

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

decomposition reaction

The reaction represented by the equation 2KCLO3 =2KCL +3O2 is a

decomposition reaction

Name the compound N2O3

dinitrogen trioxide

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

double-displacement reaction.

Most of the volume of an atom is occupied from the

electrons

Which of the following number of atoms can form a tetrahedral molecule?

five

Which of the metric units are used to measure mass?

g

As the atomic number increases, the number of electrons in a neutral atom

increase

An anion

is an ion with a negative charge

What determines that an element is a metal?

its position in the periodic table

According to VSEPR theory, the molecular shape of CO2 is classified as

linear

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

longer

Name the compound Ni(ClO3)2

nickel(II) chlorate

Which of the following elements normally exists in the form of diatomic molecules?

nitrogen

If tow convalently bonded atoms are identical, the bond is

nonpolar covalent

What is the name of the alkane having five carbons?

pentane

Name the compound KClO3

potassium chlorate

starting substance in a chemical reaction

reactant

Name the compound SiO2

silicon dioxide

Limiting a reactant is often accomplished by

slowing down a chemical reaction

Name the compound SO3

sulfur trioxide

Pressure is the force per unit

surface area

An atom is electrically neutral because

the numbers of protons and neutrons are equal

Elements in the same group have similar chemical properties because

they have the same number of valence electrons

Where does a subscript that indicates the number of atoms appear, relative to a chemical symbol in a formula?

to the lower right


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