Chem 104

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced? 4Fe+3O2 --> 2Fe2O3

2 moles of Fe2O3/ 3 moles of O2

What are the coefficients that are required to balance the following equation Al(s)+H2SO4(aq) --> Al2(SO4)3(aq)+H2(g)

2,3,1,3

What is the molarity of a solution that contains 17g of NH3 in 0.50 L of solution

2.0 M

How many moles of H2O are found in 40.0g of H2O

2.22 moles of H2O you use the atomic mass number H2: 1.008x2=2.016 O: 16.00 add together=18.016..... you then take the 40.0 and divide by 18.016 this equals 2.22 moles of H2O

0.400 mole of sucrose, C12H22O11, contains ________ C atoms.

2.89 x 10^24

What is the concentration, in mass percent (m/m), of a solution prepared from 50.0g NaCl and 150.0g of water

25.0%

Which of the following gives the balanced equation for this reaction: K3PO4+Ca(NO3)2 --> Ca3(PO4)2+KNO3

2K3PO4+3Ca(NO3)2 --> Ca2(PO4)2+6KNO3

For the following reaction, what is the correct coefficient for H2 when the equation is balanced Fe+HCl --> FeCl3+H2

3

How many moles of water H2O, are present in 75.0 g H2O

4.17

At STP, what is the volume of 2.00 mole of carbon dioxide

44.8 L

A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from 25 C to 35 C. What is its new volume

5.17 L

How do you write the number .000571 in scientific notation?

5.71×10^-4

In the reaction of nitrogen gas, N2 with hydrogen gas H2 to form ammonia gas NH3 . How many moles of hydrogen are needed to react with 2 moles of nitrogen: N2+3H2 --> 2NH3

6 moles

One mole of particles of any substance contains how many particles?

6.02 x 10^23

What mass of KCl is in 350 mL of 0.24 M KCl?

6.3 g

A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 °C. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 °C?

630 mL

Find the mass of AlCl3 that is produced when 25.0 g of Al2O3 reacts with HCl according to the following equation: Al2O3+6HCl --> 2AlCl3+3H2O

65.4 g

How many protons and electrons does the O^2- ion have

8 protons and 10 electrons

what is the correct full atomic symbol for an atom that has 35 protons and 46 neutrons?

81/35 Br

In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100g of silver nitrate when it is mixed with an excess of sodium chloride? AgNO3+NaCl --> AgCl+NaNO3

84.4 g

The correct formula for a compound formed from the elements Al and O is

Al2O3

What is the correct formula for the ionic compound formed between the following ions Al^3+ and S^2-

Al2S3

place the following elements in order of decreasing atomic radius

P, Cl, N

which is the correct formula for the phosphite ion

PO3^3-

Arrange the following atoms in order of increasing electronegativity

S Cl F

Which of the following are correct formulas of the ion of each element listed

Flourine=F^1- Sodium=Na^1+

What is the formula for the nitride ion

N^3-

Water is a polar solvent and hexane is a nonpolar solvent. Which of the following correctly describes the solubility of the solute in the given solvent

NaHCO3, soluble in water

Oxidation-Reduction mnemonic

OIL RIG Oxidation is Loss Reduction is Gain

What is the correct formula for the oxide ion

O^2-

Which of the following identifies the correct number of significant figures?

0.00103 m has 3 significant figures

What is the answer to the following problem with the correct number of sig figs? 2.5x0.621/8.42×20.0

0.0092

A 10.0 mL of 0.121 M H2SO4 is neutralized by 17.1 mL of KOH solution. The molarity of the KOH solution is

0.142 M

What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100 mL

0.150 M

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation: 2H2+O2 --> 2H2O

0.202g

Complete the following equality: 1s=___ ¿s

1,000,000 ¿s

How many CO2 molecules are in 0.0180 moles of CO2

1.08x10^22 molecules of CO2

How many moles of C atoms are found in 0.185 moles of C6H14O

1.11 moles of carbon you take the 6 C and multiply by 0.185

What is the pH of a solution with [OH-]=1×10^-4 M

10.0

A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 mmHg and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr?

1100 torr

A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mmHg?

1140 mm Hg

At 570. mm Hg and 25°C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temperature of 175°C?

1560 mm Hg

How do you round the number 1570 to 2 sig figs?

1600

What is the molar mass of sodium phosphate

164.0 g/mol

The [H3O+] of a solution with pH=2.0 is. ________

1x10^-2 M

What is the [OH-] in a solution that has a [H3O+]=1×10^-6 M

1x10^-8 M

The daily dose of ampicillin for the treatment of an ear infection is 140mg/kg of body weight. What is the daily dose for a 47.5 lb child? give answer with correct sig figs.

2

What is the molar mass of Fe(ClO4)3

354.2 g/mol

The molar mass of potassium is _________

39.1 g/mol

A temperature of 125 C is the same as ______?

398 K you take the C temp and add 273 to get Kelvin

The name of the Cu+ ion is ________

Copper(I)

list the elements in order of increasing ionization energy

Cs, K, Na

what is the correct formula for the ionic compound for copper(I) oxide

Cu2O

Which of the following molecules can undergo hydrogen bonding force between 2 molecules

H2O

The correct formula for sulfuric acid is _____

H2SO4

The conjugate acid of H2O is ______

H3O+

Which of the following compounds contains a polar covalent bond

HCl

What is the symbol for the ion with 19 protons and 18 electrons?

K+

Which of the following elements has 2 valence electrons

Magnesium

The compound MgCl2 is named ________

Magnesium Chloride

In this reaction, what is the substance oxidized? Zn+2HCl --> ZnCl2+H2

Zinc

What are combustion reactions?

a carbon containing compound, usually a fuel, burns in oxygen from the air to produce carbon dioxide (CO2), water (H2O), and energy in the form of heat or a flame

The carbon tetrachloride molecule, CCl4, is _______

a nonpolar molecule with polar bonds.

The solubility of Kl is 50g in 100g of H2O at 20 C. If 110g of Kl are added to 200g of H2O ________

a saturated solution will form

Electrons can move to a higher energy level when they ______ light

absorb

which of the following elements are metals

aluminum and zinc

According to the Arrhenius concept, if HNO3 were dissolved in water, it would act as ________

an acid

In a neutralization reaction ________

an acid and a base react to form salt and water

Which of the following atoms has the largest atomic radius

calcium

In a solution, the solvent _______

can be a solid, liquid, or gas

The correct name for the compound N2O3 is ________

dinitrogen trioxide

which of the following statements are true

electrons repel each other, a proton and an electron have opposite charges, the nucleus contains most of the mass of an atom

What are replacement reactions

elements in a compound are replaced by other elements

What is the base unit for the measurement of mass in the metric system?

gram

An ionic compound

has a net charge of zero

The name given to an aqueous solution of HCl is _______

hydrochloric acid

The main type of interaction between molecules of ammonia (NH3) are _____

hydrogen bonds

Fe2(SO4)3 is called

iron (III) sulfate

Which of the following elemental symbol pairs is wrong

iron, Ir

How many electrons will aluminium gain or lose when it forms an ion

lose 3

In ionic compounds, _________ lose their valence electrons to form positively charged _______________

metals cations

The force of gas particles against the walls of a container is called

pressure

Which one of the following is a characteristic of an acid

produces H3O+ in water

In an oxidation-reduction reaction, the substance reduced always ______

shows a gain of electrons

What is the classification for this unbalanced reaction? Fe+HCl --> FeCl3+H2

single replacement

In replacement reactions: single replacement vs double replacement

single: one element replaces another element. double: 2 elements replace each other

A mixture is prepared by dissolving 2 g of KCl in 100 g of H2O. In this mixture, H2O is the ________.

solvent

what is the correct name of the following covalent compound: P4S3

tetraphosphorus trisulfide

which of the following names and formula pairs are correct

tin oxide, magnesium chloride, lithium nitride, strontium bromide

The molecular shape of the ammonia molecule NH3 is __________

trigonal pyramidal

Using VSEPR, what is the molecular shape of nitrogen trichloride

trigonal pyramidal

What is a combination reaction

when 2 or more elements or compounds bond to form one product

What is a decomposition reaction?

when a reactant is splits into 2 or more simpler products