Question

What is the term for the modification of a substance that does not alter its chemical composition?

  1. A) physical reaction
  2. B) chemical change
  3. C) molecular change
  4. D) atomic change
  5. E) physical change

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Science
Chemistry

General Chemistry

Related Chemistry Q&A

Find answers to questions asked by students like you.

Q: 1. You are going to do the boiling point experiment in the venting hood. Would you expect the observ...

A: Click to see the answer

Q: How many boron atoms are there in 2.00 g of boron?

A: Click to see the answer

Q: Draw the products of the attached Diels–Alder reactions. Indicate stereochemistry where appropriate.

A: Click to see the answer

Q: Define atomic numberand mass number.Which can varywithout changing the identity of the element?

A: Atomic number (Z) is defined as the number of protons present in the atom. Mass number is defined as...

Q: In recent years, the periodic table has been expanded through element 118, which has a filled 7p sub...

A: All elements are arranged in a well-organized manner in the periodic table. The periodic table displ...

Q: A chemist adds  230.0mL  of a  0.233 M potassium dichromate  K2Cr2O7  solution to a reaction f...

A: Given : Concentration of K2Cr2O7 = 0.233 M And volume of solution used = 230.0 mL = 0.230 L         ...

Q: Write the Lewis structure for molecule (octet rule not followed).ClO2

A: Lewis structures gives the bonding within atoms and also the lone pairs in molecule.  

Q: Write the balanced NET ionic equation for the reaction when copper(II) sulfate and ammonium hydroxid...

A: Click to see the answer

Q: Question 11 What is the density of N2 gas at STP? mass Density = Volume For gasses, the units are g/...

A: Click to see the answer

Q: When a solution of PtCl2 reacts with the ligand trimethylphosphine,P(CH 3) 3, two compounds are prod...

A: Click to see the answer

Q: Show your all calculation

A: The given solution is a buffer mixture of weak base dimethylamine, (CH3)2NH  and its conjugate acid ...

Q: Which are Lewis acids and which are Lewis bases?(a) BF₃(b) S²⁻(c) SO₃²⁻(d) SO₃

A: The molecules in which central atom is electron deficient and hence,can accept lone pair of electron...

Q: Reaction of p-cresol with two equivalents of 2-methylprop-1-ene affords BHT, a preservative with mol...

A: Given:

Q: An ideal gas is allowed to expand from 3.20 L3.20 L to 27.2 L27.2 L at constant temperature. By what...

A: Given : Initial volume of gas = 3.20 L Final volume of gas = 27.2 L  

Q: Show your all work

A: a) Rb-1 : The atomic number of element Rb is 37. The number of electrons in any ion of an element is...

Q: 22. Compare Structure A with Structures B, C, and D. Which structure B, C, or D is a resonance struc...

A: The concept of resonance says that whenever a single Lewis structure is unable to explain certain pr...

Q: 3- a particular body of the material or a alloy ch composition is (are ) recognized as - a. Alloy b....

A: A substance or substances of which things are made are called material . They can be of 2 types  Ho...

Q: Given the tables of standard free energy of formation, calculate AG°xn for the reaction 2SO2(g) + O2...

A: The Gibbs free energy of reaction tells about the spontaneity of a reaction. If the value is negativ...

Q: Name an indicator that would be sensitive to a pH of 1

A: In titration a solution of known concentration is made to react with solution of unknown concentrati...

Q: Which one of the following statements is not true about the control rods used in nuclear reactors: a...

A: Click to see the answer

Q: For each N-substituted benzene, predict whether the compound reacts faster than, slower than, or at ...

A: The electron donating groups or activating groups make benzene ring more electron rich, as a result ...

Q: a) Are these molecules chiral? In a few sentences, explain your reasoning for your classification of...

A: Chiral carbon is carbon containing 4 different groups.  Molecules with no stereocenters are almost a...

Q: Dichromate reacts with aqueous iron (II) ion in acidic solution according to the balanced equation: ...

A: During the titration, the moles of species K2Cr2O7 and FeSO4 is equivalent then this point will be t...

Q: 8. Explain why the reaction of indene and HBr provides only a singly addition product? Br HBr Indene

A: Click to see the answer

Q: Show that the [4 + 2] Diels–Alder reaction is photochemically forbidden.P

A: When ultraviolet light is used rather than heat for [4+2] Diels-Alder reaction, it is photochemicall...

Q: . Predict how the bond, shown in each of the following compounds will break with the aidof the appro...

A: (a) The bonds formed in the compound between the elements are the covalent bond. The covalent bond i...

Q: How many milliliters of 3.0 M H2SO4 are needed to make 450 mL of 0.10 M H2SO4?

A: Click to see the answer

Q: A metal with molar mass of 46.15g/mol crystallizes in a face-centered cube with edge length of 392 p...

A: In a face centered cube unit cell one atom exist in the center and eight 1/2 atom lies in each face ...

Q: What do you mean by Carbonyl Compounds and Their Reactions?

A: There are many functional groups that can be added to a hydrocarbon chain. The hydrocarbon chain is ...

Q: What is meant by coagulation of a colloidal solution? Describe briefly any three methods by which co...

A: Click to see the answer

Q: Show how you would synthesize each compound, beginning with acetylene and anynecessary additional re...

A: Acetylene has a molecular formula of C2H2 and has a triple bond between the two carbon atoms. In ord...

Q: A tank with 43.2 kg of water is leaking at a rate of 0.0135 kg/s. How many hours will it take ...

A: Given: Tank capacity = 4.32 kg Leaking rate = 0.0135 kg/s

Q: Explain the Synthesizing an Ether by a Two-Step Reaction Sequence ?

A: The two-step reaction sequence for the synthesis of ether is known as the Williamson synthesis of et...

Q: The hydrogen atom can absorb light of wavelength 1094 nm.(a) In what region of the electromagnetic s...

A: The wavelength of the light is 1094 nm = 1.094 × 10-6 m. This wavelength of the light radiation fall...

Q: The number of electrons excited to the conduction band per cubic centimeter in a semiconductor can b...

A: Click to see the answer

Q: Chemistry Question

A: When organic compounds undergo combustion, they produce carbon dioxide and water. Chemical reactions...

Q: Before a chemist runs an experiment, they fill out a data table with all of the reactants informatio...

A: The considered reaction is,

Q: Show your all work

A: Given : The compound with name dichlorine hexaoxide. And number of molecules of dichlorine hexaoxide...

Q: A buffer is prepared from acetic acid and acetate ions, so that [CH3COOH] = [CH3COO-]. Ka of acetic ...

A: Buffer solutions are those solutions that have the capabilities to resist pH when a small amount of ...

Q: Given pKa values for ionizable groups from Table 27.2, sketch curves for the titration of Q.) glutam...

A:  

Q: Evaluate the following expressions. Impose the rules for significant figures different ways for the ...

A: Significant figures of value determine the precision and accuracy of a calculation. When expressing ...

Q: A sample bottle that weighs 27.32 g is filled with an unknown liquid to its capacity of 19.58 mL.  T...

A: Given : Mass of bottle with liquid = 41.27 g Mass of empty bottle = 27.32 g And volume of liquid fil...

Q: If the heat of solution of a salt is highly endothermic and 100 g of that salt are dissolved in 1 L ...

A: When heat of solution of a salt is highly endothermic it means that during dissolution of that salt ...

Q: The heat of vaporation of water is 40.7 kJ/mol. How much heat is required, in J, to convert 259mg of...

A: Given : Mass of water = 259 mg And heat of vaporisation of water = 40.7 KJ/mol Since 1 g = 1000 mg H...

Q: 35.0 grams of H2S were reacted with 115.0 g of O2 to produce S02 and H20. The theoretical yield of S...

A: Chemical equation is the equation in which the chemical reaction is represented. All the reactant mo...

Q: From the water sample analysis: 40 mg/L Ca+2, 5 mg/L Mg+2, 10 mg/L K+, 10 mg/L SO4-2, and alkalinity...

A: Hardness is the term often used to characterize a water that doesn't form a foam or lather well and ...

Q: Which of compounds A and B is the stronger base? Why? A NH N.

A:  Compounds that has a strong tendency to donate a pair of electron is called a base. The class of co...

Q: At pH 7.4, the pH of blood plasma, do the majority of protein-derived amino acids bear a net negativ...

A: Concept introduction: Isoelectric point (pI) is defined as pH at which the protein has no net charge...

Q: Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to p...

A: Click to see the answer

Q: How do I solve 25.ab? :)

A: The Henderson Hasselbalch equation for acidic buffer is given as :