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Questions and Answers
What is the correct electron configuration for the bromide ion?
What is the correct electron configuration for the bromide ion?
What is the average atomic mass for the element silicon based on its isotopes?
What is the average atomic mass for the element silicon based on its isotopes?
Which elements in the 2nd period of the periodic table are paramagnetic in their neutral state?
Which elements in the 2nd period of the periodic table are paramagnetic in their neutral state?
How many total atoms are in one molecule of sucrose with the formula (C6H11O5)2O?
How many total atoms are in one molecule of sucrose with the formula (C6H11O5)2O?
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What is the total number of atoms in one molecule of sucrose represented by (CH2OH)2?
What is the total number of atoms in one molecule of sucrose represented by (CH2OH)2?
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What is the correct chemical formula for aluminum sulfate?
What is the correct chemical formula for aluminum sulfate?
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Which of the following correctly names the transition metal ionic compound, non-transition metal ionic compound, and covalent compound?
Which of the following correctly names the transition metal ionic compound, non-transition metal ionic compound, and covalent compound?
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What is the correct name for the chemical formula Mg3(PO4)2?
What is the correct name for the chemical formula Mg3(PO4)2?
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What is the chemical formula for chromium (III) sulfate?
What is the chemical formula for chromium (III) sulfate?
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Which halogen substituent in bromochloroiodomethane (CHBrClI) has the lowest electronegativity?
Which halogen substituent in bromochloroiodomethane (CHBrClI) has the lowest electronegativity?
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Which of the following pairs is incorrectly named?
Which of the following pairs is incorrectly named?
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Which statement about the Lewis structure for ozone (O3) is correct?
Which statement about the Lewis structure for ozone (O3) is correct?
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How many total electrons should be included in the Lewis structure for the polyatomic ion sulfate (SO4^2-)?
How many total electrons should be included in the Lewis structure for the polyatomic ion sulfate (SO4^2-)?
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How many total valence electrons should be included in the Lewis structure for HCO3-?
How many total valence electrons should be included in the Lewis structure for HCO3-?
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Which bond is the most polar among the given options?
Which bond is the most polar among the given options?
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Which of the following statements about an unspecified Lewis structure is correct?
Which of the following statements about an unspecified Lewis structure is correct?
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Which nitrogen-nitrogen bond has the highest bond energy?
Which nitrogen-nitrogen bond has the highest bond energy?
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What is the best reasoning for choosing the correct Lewis structure for CH5N?
What is the best reasoning for choosing the correct Lewis structure for CH5N?
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What is the total sum of coefficients after balancing the equation Ca(s) + H2O(l) → Ca(OH)2(aq) + H2(g)?
What is the total sum of coefficients after balancing the equation Ca(s) + H2O(l) → Ca(OH)2(aq) + H2(g)?
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What is the coefficient of iron oxide (Fe3O4) in the balanced reaction Al(s) + Fe3O4(s) → Al2O3(s) + Fe(s)?
What is the coefficient of iron oxide (Fe3O4) in the balanced reaction Al(s) + Fe3O4(s) → Al2O3(s) + Fe(s)?
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How many dozen of aluminum will be produced from 25 dozen of aluminum oxide in the reaction Al2O3(s) → Al(s) + O2(g)?
How many dozen of aluminum will be produced from 25 dozen of aluminum oxide in the reaction Al2O3(s) → Al(s) + O2(g)?
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What is the coefficient for potassium sulfate in the reaction of iron(III) sulfate with potassium thiocyanate to produce potassium iron(III) thiocyanate and potassium sulfate?
What is the coefficient for potassium sulfate in the reaction of iron(III) sulfate with potassium thiocyanate to produce potassium iron(III) thiocyanate and potassium sulfate?
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Which of the following Lewis structures violates the octet rule?
Which of the following Lewis structures violates the octet rule?
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In the balanced reaction 2Al + Fe3O4 → Al2O3 + 3Fe, how many moles of iron are produced?
In the balanced reaction 2Al + Fe3O4 → Al2O3 + 3Fe, how many moles of iron are produced?
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Which states of matter are represented in a sample of boiling water?
Which states of matter are represented in a sample of boiling water?
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How many milligrams are in a nanogram?
How many milligrams are in a nanogram?
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There are 10^-9 megagram in 1 _____________.
There are 10^-9 megagram in 1 _____________.
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What is the speed of a Cheetah, running at 120.7 kilometer per hour, in feet per minute?
What is the speed of a Cheetah, running at 120.7 kilometer per hour, in feet per minute?
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Which statement about naturally occurring hydrogen isotopes is true?
Which statement about naturally occurring hydrogen isotopes is true?
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What charge does an atom with 19 protons and 18 electrons have?
What charge does an atom with 19 protons and 18 electrons have?
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Which element has a neutral atom with the electron configuration of [Xe]6S2?
Which element has a neutral atom with the electron configuration of [Xe]6S2?
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How many molecules of NH3 can be produced if you react 1.87 x 10 hydrogen atoms with an excess of N2?
How many molecules of NH3 can be produced if you react 1.87 x 10 hydrogen atoms with an excess of N2?
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Which of the following statements about the Lewis structure for CO2 is correct?
Which of the following statements about the Lewis structure for CO2 is correct?
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What are the correct names for Mg3(PO4)2, N2O5, and Cr(ClO4)6, respectively?
What are the correct names for Mg3(PO4)2, N2O5, and Cr(ClO4)6, respectively?
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How many molecules of nitric oxide (NO) are formed from 100 molecules of ammonia (NH3) in the reaction 4NH3 + 5O2 → 4NO + 6H2O?
How many molecules of nitric oxide (NO) are formed from 100 molecules of ammonia (NH3) in the reaction 4NH3 + 5O2 → 4NO + 6H2O?
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What is the coefficient for hydrogen in the reaction H2 (g) + F2 (g) → 2HF (g) when properly balanced?
What is the coefficient for hydrogen in the reaction H2 (g) + F2 (g) → 2HF (g) when properly balanced?
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What is the total coefficient for the chemical equation 2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O?
What is the total coefficient for the chemical equation 2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O?
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In the reaction Heat + O2(g) + N2(g) → 2NO(g), what can we say about the energy of the system?
In the reaction Heat + O2(g) + N2(g) → 2NO(g), what can we say about the energy of the system?
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What is the number of shared electrons in a correct Lewis structure of H2O?
What is the number of shared electrons in a correct Lewis structure of H2O?
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Study Notes
States of Matter and Conversions
- Boiling water illustrates the states of matter: liquid and gas.
- Milligrams in a nanogram: 10^-6 mg.
- In 1 megagram, there are 10^9 grams.
- A mixture of solid and gas is represented by specific particle diagrams.
Speed Conversion
- Cheetah runs at 120.7 km/h, converting to feet per minute yields approximately 6,601.37 ft/min in scientific notation.
Isotopes of Hydrogen
- Naturally occurring hydrogen has three isotopes: 1H (99.98%), 2H (0.0156%), and 3H (0.0044%).
- 1H has more protons than 2H, while 3H and 2H have the same number of protons.
Atomic Structure
- An atom with 19 protons and 18 electrons is positively charged and termed a cation.
- Neutral atom with electron configuration [Xe]6S2 is Barium (Ba).
- Zinc ion (Zn2+) has electron configuration [Ar]3d10 and is diamagnetic.
Chemical Compounds and Naming
- S-block metal, transition metals, and p-block metal examples include calcium, molybdenum, mercury, and chlorine.
- Neutrons in an atom can be calculated as (mass number - atomic number).
- Bromide ion has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶.
Average Atomic Mass of Silicon
- The average atomic mass of Silicon (Si) calculated considering its isotopes is approximately 28.0854.
Periodic Table and Molecules
- In the second period, only certain elements (Li, B, N, F) will be paramagnetic.
- A sucrose molecule (C6H11O5)2O contains 54 total atoms.
Chemical Formulas and Balancing
- Chemical formula for aluminum sulfate is Al2(SO4)3.
- Transition metal, non-transition metal, and covalent compound naming includes zinc chloride, strontium (II) sulfate, and dinitrogen pentoxide.
- Correct name for Mg3(PO4)2 is Magnesium (II) phosphate, while chromium (III) sulfate is Cr2(SO4)3.
Lewis Structures and Electrons
- Electrons in sulfate ion (SO4²-) total 32.
- Valence electrons for bicarbonate ion (HCO3-) add up to 24.
- O-H bond in Lewis structure is most polar due to the large electronegativity difference.
- Complete octet confirmation and shared bonds in a molecule can be evaluated through Lewis structures.
Reactions and Molecule Production
- Balanced reactions yield specific coefficients: example includes 100 molecules of NH3 producing a ratio of molecules of NO.
- Coefficient for hydrogen in the reaction with fluorine to form HF is 1.
- Total coefficient from the reaction between aluminum hydroxide and sulfuric acid is 12.
Energy of Chemical Systems
- Reactions involving heat can signify energy changes in the system, represented as ΔH indicating whether energy is absorbed or released.
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Description
Test your knowledge on states of matter and conversions in this chemistry quiz. Answer questions about boiling water, milligrams in a nanogram, and metric conversions. Perfect for students at Lehman College.
