DIRECTIONS: FILL THE BLANKS WITH THE CORRECT ANSWER.  The critical age under which sunscreens should not be used on babies is: ___ The critical wavelength used in the broad-spectrum test of sunscreens is: ___ Sunscreens that are broad-spectrum and have an SPF value of at least ___ can claim that they can prevent aging and skin cancer. A sunscreen claimed to be “very water resistant” still provides protection after____ minutes of water immersion.  A particle is usually called nanoparticle if its size is smaller than ___ nm.

Q: Use a Fischer projection to describe the stereochemistry of (R)-2-dhkorobutane by dragging the funct...

A:

Q: ionic

A: We know that, solubility of an ionic compound in water is mainly dependent on lattice enthalpy. Solu...

Q: CH3 CH3 CH3 -Br Br- -H- Br- -H Br- H -CH3 CH3 -CH,CH3 CH;CH, H Br CH,CH3 ČH3

A:

Q: Why does a [2+2] cycloaddition reaction require a thermal condition to be met for initiation?

A: The reason is as follows:  

Q: Decytospolides A and Bare fungal natural products that are toxic to some cancer cells, In a synthesi...

A: Concept : 1) NaH is used as base for deprotonation.  2) Grignard reagent is used as nucleophile here...

Q: Calculate the degree of unsaturation. Assign the relevant peaks in the IR spectrum. Assign the peaks...

A: The structure is as follows:  

Q: Consider this reaction: CICH,CH,CI (g) → CH,CHCI (g) +HCl (g) At a certain temperature it obeys this...

A: Given, ClCH2CH2Cl (g) ➝ CH2CHCl (g) + HCl (g) Rate law expression at certain temperature: rate = (1....

Q: Write the electron configuration for barium.

A: Electronic configuration....

Q: Write the word “reducing” if the statement is correct, otherwise write “non-reducing”. 10. Galactos...

A: Reducing

Q: A 7.46 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 25....

A:

Q: Which of the following expressions is the correct equilibrium-constant expression for the reaction b...

A: The equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical eq...

Q: Give the IUPAC name for the compounds shown below

A: g) 5-methyl-2-oxacyclohexanone   

Q: The reaction 2NO (g) + Cl2 (2) A 2NOCI (g) has K = 100 at 300K. A particular equilibrium mixture at ...

A: The equilibrium constant of a reaction is the ratio of the product's concentration to the concentrat...

Q: 1. In a nonpolar covalent bond, A. electrons are shared equally between the two atoms. B. electrons...

A: In non polar compound electron is shared equally to both species /atoms through Internuclear axis.  ...

Q: Given the chemical equation: 2H₂ + O₂ → 2H₂O, how many moles of H₂O is produced to balance the equat...

A: When hydrogen (H2) gas burns in oxygen (O2)  water(H2O) is produced. 

Q: A 2.05 g sample of an unknown compound contains H, S, and O. If the compound contains 0.050 g H and ...

A:

Q: A chemist prepares a solution of sodium carbonate (Na, CO,) by measuring out 62.5 g of sodium carbon...

A: Given :-  Mass of Na2CO3 = 62.5 g  Volume of solution = 350. mL  To determine :-  Concentration of s...

Q: At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.0927 s...

A:

Q: Current Attempt in Progress A 2.05 g sample of an unknown compound contains H, S, and O. If the comp...

A:

Q: True or False. Write the word “reducing” if the statement is correct, otherwise write “non-reducing”...

A: The answer is as follows:  

Q: Propose a set of reactions to convert the starting material to the given product. NO2 OMe

A: The given transformation can be carried out in different ways.  But, I will show the most effective ...

Q: WHAT IS THE UNCATALYZED NEUTRAL REACTION IN WATER (need to have substrate, product, and qualitative ...

A:

Q: MW 74 cail lar ibeteen salt plate se EERS Com 3H 3H IH IH 2H 1.0 PPM TR TTE SCET

A:

Q: Thermite welding is an exothermic reaction, which produces molten iron that permanently binds metals...

A: The process is called as aluminothermic process.  In this process the aluminium metal acts as a redu...

Q: A chemist makes 570.mL of zinc nitrate ZnNO32 working solution by adding distilled water to 260.m...

A:

Q: 1-pentanol  (NaBr/H2SO4) --> 1-bromopentane Propose plausible side-products (also called by-product...

A:

Q: Single Bonds Multiple Bonds H-H 432 N-H 391 149 c=C 614 H-F 565 N-N 160 |-CI 208 C=C 839 H-CI 175 49...

A:

Q: What is the concentration of each ion in a 0.20 Molarity sodium phosphate solution?

A: Given :- concentration of sodium phosphate solution = 0.20 M  To calculate :- concentration of each ...

Q: A clinical lab technician determines that a minimum of 70 mL of working reagent is needed for a proc...

A: Amount of Reagent needed = 70 mL Dilution ratio = 1/8 or 1:8 Volume of reagent taken = 70 mL Volume ...

Q: O CHEMICAL REACTIONS Calculating molarity using solute moles A chemist prepares a solution of iron(I...

A: Given, Note: 1 µmol = 10-6 mol Moles of FeBr3 = 85 µmol = 85 × 10-6 mol Note: 1 mL = 10-3 L Volume o...

Q: COOH CI NO2 Br

A:

Q: What do you call the type of analytical method that relies on the absolute stoichiometric equivalenc...

A: Oxidative Methods Explanation :   Step-1   The chemical nature of the species present in the unknown...

Q: Q2. Determine the following for the cobaltocene a. Total number of microstates possible. b. All the ...

A: Cobalt is in +2 oxidation state. Due to that two rings present around it. 

Q: F ONLY- ( STRUCTURAL ANSWER ONLY)

A:

Q: 2. Consider the cell reaction: MnO4 + Fe* → Mn²* + Fe³* SRP: E° Fe*/Fe2* = +0.77 V; E° MnO,/Mn²* = +...

A:

Q: G. perbromic acid type: formula: H. tetraphosphorus hexasulfide type: formula: I. tin (IV) sulfide t...

A:

Q: For each formula, fill in the eight items listed in the instructions. The Lewis models (at least) sh...

A: Answer is attached below

Q: solution

A: We know that, accuracy reflects how close a measurement is to a known or accepted value, while preci...

Q: reagents are

A:

Q: -OH Age O Ci

A: The product is as follows:  

Q: Benzoic acid is a crystalline powder used as a food preservative. It contains 68.8% C, 5.00 % H, and...

A: We have to predict the empirical formula.  

Q: The standard enthalpy change for the following reaction is -851 kJ at 298 K. 2 Na(s) + O2(g) + H2(g...

A:

Q: 2. In MO theory, combining two s atomic orbitals produces _____ and combining two p atomic orbitals ...

A: According to the molecular orbital theory the atomic orbitals combine to form molecular orbital. The...

Q: A. Conjugation in Dienes A1. Determine if the alkenes in the following molecules are conjugated or i...

A: Since you have asked multiple question, we will solve the first question for you as per our guidelin...

Q: 4. Show the steps necessary, in order, to make each of the following compounds. Start with benzene, ...

A:

Q: at percentage of the c

A:

Q: 1. How many MOLECULES of nitrogen monoxide are present in 3.82 moles of this compound ? molecules. 2...

A:  no of molecules = mole× No

Q: 1) 2N2O5 4NO + 302 K = 5.25 x 10-6 3.73М 3.75M 3.75M are the starting concentrations. Calculate the ...

A: Equilibrium constant is the ratio of concentration of products and concentration of reactants raised...

Q: Consider the following equilibrium: H2 (e) + 12 (s) 2HI (g) Which of the following is the proper exp...

A: We have to predict the equilibrium constant expression.  

Q: certain temperature this reaction follows first-order kinetics with a rate constant of 0.0188 s NH,O...

A: Given reaction followed first order kinetics

Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.