18. Based on the molecular diagram, classify each change as physical or chemical. b. C.

Q: Polychlorinated biphenyl (PCBs) are environmental contaminants composed of carbon, hydrogen, and…

A:

Q: the temperature of the salt and water is 23.72 °C. After the salt has completely dissolved, the…

A: Given : Heat gained by the solution = 3116 J

Q: How can a decomposition reaction be easily distinguished from other types of chemical reactions?

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Q: e shows the number chemical Change C cal Reaction Read of the following state hemical reaction A, b…

A: Types of chemical reaction 1. Chemical combination reaction or synthesis reaction 2. Chemical…

Q: A person tells you that a reaction must have stopped because the amounts of products and reactants…

A: According to the person, reaction have stopped because the amounts of products and reactants have…

Q: Consider these reactions, where M represents a generic metal.…

A: The given equations are as follows. 2M(s)+6HCl(aq)⟶2MCl3(aq)+3H2(g)…

Q: When heated solid calcium chlorate decomposes into solid calcium chloride and releases oxygen gas

A: Equation for the reaction :

Q: 350 mL of a 2.0 M NaOH solution is added to a beaker.  How many moles of NaOH were added?  How many…

A: Molarity ( M ) :-  The number of moles of solute present in dissolved state in one litre of solution…

Q: Use the information and table to answer the question. A chemistry company is hired to produce sodium…

A:

Q: a decomposition reaction?

A:

Q: Write the dilution expression and define each term.

A: The dilution expression and the term has to be given,

Q: Consider these reactions, where M represents a generic metal.…

A: Given reactions: 2M(s)+6HCl(aq)→2MCl3(aq)+3H2(g)      ∆H1=-669.0 kJ----eqn(1)HCl(g)→HCl(aq)…

Q: what is a precipation reaction? provide an example

A: Precipitation reactions are usually double displacement reaction involving the production of a solid…

Q: Discuss how the water in a dam converted its energy. What happens to this energy after conversion?

A: Hydroelectric power is a renewable energy source which uses the power of moving water to produce…

Q: What happens to the kinetic energy of the particles in a sample of gas as the temperature of the…

A:

Q: Two aqueous solutions, Solution A and Solution B, are mixed together in a beaker, and the following…

A: When two or more substances combine to form new substances,a chemical reaction is said to occur.…

Q: oefficients will balance the reaction in the pictured: __Al + ___HCI ---> ___AlCl3 + ___

A: Balancing the equations occurs in such a way that there is an equal number of atoms on both sides.…

Q: When chemical reactions happen molecular ________________ break and _____________________.

A: Chemical reactions are those reactions in which substances are changed and transformed from one of…

Q: List examples of chemical reaction

A: Chemical Reactions are symbolic representation of different Reactants and Products. In chemistry,…

Q: If you mixed 8.0 tons of sand, 12 tons of rock, and 4.0 tons of cement to make concrete, what would…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Adding hydrochloric acid to sodium hydrogen carbonate will form sodium chloride, or table salt. If…

A: HCl + NaHCO3 → NaCl + H2CO3 If 1 mole of HCl is added, 1 mole of NaCl is formed. If 0.5 mole of HCl…

Q: Interpret the following equation for a chemical reaction using the coefficients given: H2(g) +…

A: Given equation :  H2(g) + F2(g) ==> 2HF (g)  Molecular level : We need to show how many molecules…

Q: a 10.000 g sample of hydrated nickel iodate Ni(IO3)2 * H20 is heated in order to driver off the…

A:

Q: Solid potassium iodide decomposes into iodine gas and solid potassium ?

A: Potassium = K Iodine = I2 potassium iodide = KI

Q: A blue crystal is placed in water. After stirring, the crystal disappears and the water becomes…

A: A chemical reaction is a process in which one or more substances known as reactants are converted to…

Q: ТСРВА

A: The compound in which two of the carbon atoms of a hydrocarbon chain are bonded to each other by a…

Q: Why are  combustion reaction important? Give an example.

A: Why are combustion reactions important? Give an example.

Q: As the reactant concentration increases, the average kinetic energy of molecules increases. TRUE OR…

A: The rate of the formation of the product or the rate of disappearance of the reactants is known as…

Q: what are the significant concepts in atoms in reaction?

A: Significant oncept of atom in reaction.

Q: Suppose that in the experiment the student failed to heat the crucible and hydate sample long enough…

A: Question : Suppose that in the experiment the student failed to heat the crucible and hydate…

Q: Choose the correct answers to complete the statement below. The formation of water from its…

A: Chemical Formula :  Water : H2O  Hydrogen : H2  Oxygen : O2

Q: y Joules were added?

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Crushing an automobile at an auto wrecking yard is an example of a chemical change because the car…

A: There are two types of changes in matter physical change and chemical change. When a substance…

Q: A geochemist in the field takes a small sample of the crystals of mineral compound X from a rock…

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Q: exothermic Is the reaction exothermic or endothermic? endothermic up Does the temperature of the…

A: Work is done by the system, sign will be negative.  Work is done on the system, sign will be…

Q: Be sure to answer all parts. Balance the equation. Remember to include states of matter. Ni(s) +…

A: Balance chemical equation: Balanced chemical equation can be define as the reaction in which number…

Q: If the solid NaCl is dried and weighed only once, what error will likely happen? How would this…

A: The number of times solid NaCl is dried and weighed whose impact on the result of percent yield is…

Q: What is the analysis and conclusion?  in the picture.

A: A question based on analysis of food, which is to be accomplished.

Q: DATE: PAGES: D if two molecules want to reactant together to form new Chemicals what is the first…

A:

Q: A chemical reaction is allowed to take place inside a beaker. When this beaker is placed in a dish…

A: A chemical reaction is a mechanism that converts one or more substances, known as reactants, into…

Q: What is the term for the substance in a chemical reaction that controls the maximum amount of…

A: The substance in a chemical reaction that controls the maximum amount of product is limiting…

Q: 16. Is the change in the illustration below a physical change or a chemical change? Explain your…

A: Physical change is the one which causes the change in physical state of the substance but its…

Q: Consider a hypothetical chemical reaction: A+B C+D (In thi

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Q: Define chemical change and list several indications that a chemical change has taken place.

A: When a substance undergoes a chemical change, its molecular composition is changed entirely. It…

Q: Name the reaction and the reactants

A: The first reaction demonstrates dehydration of alcohol. The alcohol which has been used as the…

Q: 139 kJ to Calories

A: Given: Energy  = 139 kJ convert into calories.

Q: What do you call the type of chemical reaction in which heat is absorbed?

A:

Q: exothermic reaction is one that in the chemical process:Immersive Reader

A: An exothermic reaction is one that in the chemical process:Immersive Reader A) absorbs energy. B)…