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When a solution of LiC2H3O2 reacts with a solution of MgSO4, what is the net ionic equation? No reaction Mg+2 (aq) + C2H3O2- (aq) → Mg(C2H3O2)2 (s) Mg+2 (aq) + 2C2H3O2- (aq) → Mg(C2H3O2)2 (s) 2Li+ (aq) + SO4-2 (aq) → Li2SO4 (s)

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Answered by answersmine AT 22/10/2019 – 02:56 AM

I think the correct answer would be the first option. When a solution of LiC2H3O2 is mixed  with a solution of MgSO4, no reaction would be observed from the mixture. This is because magnesium cannot replace lithium from the acetate compound. Lithium is the least reactive substance based from the activity series. So, it can only react with a few substances and it does involve the reaction with magnesium sulfate. It is the very least reactive of all the alkali metals. 

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The pictures below show a cave and a geyser. Which of these statements is correct about the cave and geyser shown in the pictures? a. Both are formed when groundwater gets heated. b. Both are formed when groundwater reacts with the limestone in rocks. c. The cave is formed when groundwater reacts with the limestone in rocks and the geyser is formed when groundwater gets heated. d. The cave is formed when groundwater gets heated and the geyser is formed when groundwater reacts with the limestone in rocks.

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I think the correct answer from the choices listed above is option C. The statement that is correct about  the cave and geyser would be that the cave is formed when groundwater reacts with the limestone in rocks and the geyser is formed when groundwater gets heated. Hope this answers the question.


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Which scientist formed his ideas about living things by performing observations with out using a microscope? A.Hooke B.malpighi C.van leeuwenhoek D.vesalius

The correct answer is D. Vesalius

Explanation:

Andreas Vesalius was a Flemish scientist and anatomist that lived during the 16th century, considered as the father of modern anatomy. During this life, Vesalius studied anatomy mainly using dissection and observing the tissues, organs, and structures in them, especially those in animals and humans. Also, he used his findings and ideas to create written works that were the base for later studies in anatomy. Besides this, as compound microscopes for studying living organisms had not been created during Vesalius time, he only used regular observations different to other scientists such as Hooke or Malpighi. Thus, it was Vesalius the one that formed his ideas by performing observations without using a microscope.

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In 1953, who developed the model that is shown below?

The right answer is Watson and Crick.

The famous science journal “Nature” published an article of two pages, accompanied by one figure, titled “A Structure for Deoxyribose Nucleic Acid”. Its authors are James Dewey Watson (24) and Francis Crick (36).

They synthesized the work of their scientific colleagues and were able to explain with a remarkable art of deduction how the DNA molecule contained in the cells of all living beings was duplicated.

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The diagram shows the stages of the eukaryotic cell cycle. Which stage is labeled E in the diagram? mitosis interphase S phase G0 phase

Answer:

The correct answer would be interphase.

The cell cycle is mainly divided into two phases: mitosis (M) and interphase.

Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.  

It can be sub-divided into three stages:

  • Gap 1 (G₁) phase which is represented by letter A in the given diagram.
  • Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram.
  • Gap 2 (G₂) phase which is represented by letter C in the given diagram.

Letter D represents mitosis (M) phase in which the actual division of the cell takes place.

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The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance lose energy during a change of state. Before the change, the atoms are close together but are able to slide past one another. Which arrow represents the change of state described above? M- gas to solid N-liquid to gas P-solid to liquid Q-liquid to solid

The correct option is this: Q – LIQUID TO SOLID.

Looking at the information given above, we are told that, before the change, the atoms are close together but are able to slide past one another. This is one of the characteristics of liquids, the particle in liquids are held together by inter molecular forces but they are still able to slide past one another. So, this tell us that, the substance was originally in the liquid state.

We are also told that, the atoms of the substance lose energy during the change of state. If there is a loss of energy, it means that, the little energy that the particles had before, which they were using to slide past one another is now removed and the particles becomes more compact. This implies that, the substance changes to solid. If the substance change to gas, there would have been gain of energy not loss. Therefore, the correction option is D. The substance change from liquid state to solid state.

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How do scientists think the earliest cells formed?

The earliest cells were formed by cells that don’t need oxygen to survive but they did produce oxygen to the water. The oxygen got sucked up by iron deposits in the waters at first. Then the oxygen started to oxygenate the water and air where as evolution interfered eucryotic cells formed and evolved creating life with a Biosphere.

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Which of the following statements is correct with respect to the photosynthetic pathway of grass or a cactus? In a cactus, carbon is fixed only during the day. In grass, carbon is fixed only during the night. In a cactus, carbon is fixed only during the night.

The answer is In a cactus, carbon is fixed only during the night.

There are three types of carbon fixation in plants – C3, C4, and CAM fixation. C3 and C4 plants open their stomata during the day while CAM plants open stomata during the night. Mostly, plants fix carbon during the day. However, plants in arid locations, such as cactuses, use CAM carbon fixation because of adaptation to water deficiency. Their stomata are closed during the day and water loss is reduced. In the night when is colder, stomata open and carbon dioxide enters through stomata.

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A student takes notes in class as shown below. A. Uses an objective process Is updated constantly B. Is not objective Does not use a process Resists new information Which are the best titles for A and B? A: “Science”; B: “Pseudoscience” A: “Pseudoscience”; B: “Science” A: “Characteristics of Science”; B: “Limitations of Science” A: “Limitations of Science”; B: “Characteristics of Science”

Answer;

A: “Science”; B: “Pseudoscience”

Explanation;

  • Science is a body of knowledge and the process of acquiring new knowledge, using scientific processes. Science uses objective processes and is updated constantly, when new ideas or information is discovered.
  • Pseudoscience on the other hand, does not follow scientific processes. It is a practice or a belief that claims to be science, but does not follow specific criteria, that is ,an objective processes.
  • Science is defined by criteria, which include, experimentation, replication of results, and peer review. Therefore, pseudoscience are beliefs and claims that do not meet such criteria.

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When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl? 2HCl + Na2S → H2S + 2NaCl A 10 liters B 0.1 liters C 40 liters D 20 liters

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When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl? 2HCl + Na2S → H2S + 2NaCl A 10 liters B 0.1 liters C 40 liters D 20 liters

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– How many moles of NaHCO3 can be produced from 125 mol of NaCl – How many moles Of H2O are produced when 6 mol of O2 is consumed in burning methyl alcohol, CH3OH, according to the following equation? – Solutions of iron(III) chloride, FeCl3, are used in photoengraving and to make ink. This compound can be made by the following reaction. a. How many moles of FeCl3 form from 31 mol of Cl2? b. How many moles of Fe are needed to combine with 5 mol of Cl2 by this reaction? c. If 0.62 mol of Fe is to be used by this reaction, how many moles of FeCl3 form? – Ammonia is produced synthetically by the reaction: a. Is this an exothermic or endothermic process? b. How many moles of NH3 are formed when 1 mol of N2 reacts with hydrogen? c. If 18 x 1023 molecules of H2 react with nitrogen, how many moles of NH3 are produced?

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A positive cahnge of enthalpy, ΔH rxn = + 55 kJ/mol, for the forward reaction means that the reaction is endothermic, i.e. the reactants absorb energy and the products are higher in energy.

Activation energy is the difference in the energy level of the reactants and the peak in the potential energy diagram (the energy of the transition state).

For an endothermic reaction, the products will be closer in energy to the transition state than what the reactans will be; so, the activation energy of the reversed reaction is lower than the activation energy of the forward reaction.

Activation energy of reverse and forward reactions is related by:

Activation energy of reverse rxn = Activation energy of forward rxn – ΔH rxn

=> Activiation energy of reverse rxn = 102 kJ/mol – 55 kJ/mol = 47 kJ/mol

Answer: 47 kJ/mol

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In order to observe a ______ property of a substance, the substance must interact with another substance , such as when gasoline burns or when sodium metal reacts with water

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This problem is to apply Roult’s Law.

Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv

p = Xsolv * Po sol

X solv = number of moles of solvent / number of moles of solution

The solvent is water and the solute (not volatile) is glycerin.

Number of moles = mass in grams / molar mass

mass of water = 132 ml * 1 g/ml = 132 g

molar mass of water = 18 g/mol

=> number of moles of water = 132 g / 18 g/mol = 7.33333 mol

mass of glycerin = 27.2 g

molar mass of glycerin:, C3H8O3: 3 * 12 g/mol + 8 * 1 g/mol + 3*16 g/mol = 92 g/mol

number of moles of glycerin = 27.2g / 92 g/mol = 0.29565

total number of moles = 7.33333 moles + 0.29565 moles = 7.62898 moles

=> X solv = 7.33333 / 7.62898 = 0.96125

=> p = 0.96125 * 31.8 torr ≈ 30.57 torr ≈ 30.6 torr.

Answer: 30.6 torr

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Silver tarnishes as silver metal reacts with hydrogen sulfide, H2S, in the air. In this reaction, dark silver sulfide, Au2S, covers the surface of silver. When silver is polished, this coating of silver sulfide can be removed from the surface. This makes the silver shiny again. Enter the coefficients that balance the tarnishing reaction equation. (Type 1 for no coefficient.)Ag(s) + H2S(g) → Ag2S(s) + H2(g)

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Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a) The given balanced ionic equation is,

Ni(NO_3)_2(aq)+Na_2S(aq)rightarrow NiS(s)+2NaNO_3(aq)

The ionic equation in separated aqueous solution will be,

Ni^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+S^{2-}(aq)rightarrow NiS(s)+2Na^+(aq)+2NO_3^-(aq)

In this equation, Na^+text{ and }NO_3^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

Ni^{2+}(aq)+S^{2-}(aq)rightarrow NiS(s)

(b) The given balanced ionic equation is,

NaNO_3(aq)+KBr(aq)rightarrow KNO_3(s)+NaBr(aq)

The ionic equation in separated aqueous solution will be,

Na^+(aq)+NO_3^-(aq)+K^+(aq)+Br^-(aq)rightarrow KNO_3(s)+Na^+(aq)+Br^-(aq)

In this equation, Na^+text{ and }Br^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

NO_3^-(aq)+K^+(aq)rightarrow KNO_3(s)

(c) The given balanced ionic equation is,

Li_2SO_4(aq)+BaCl_2(aq)rightarrow BaSO_4(s)+2LiCl(aq)

The ionic equation in separated aqueous solution will be,

2Li^+(aq)+SO_4^{2-}(aq)+Ba^{2+}(aq)+2Cl^-(aq)rightarrow BaSO_4(s)+2Li^+(aq)+2Cl^-(aq)

In this equation, Li^+text{ and }Cl^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

SO_4^{2-}(aq)+Ba^{2+}(aq)rightarrow BaSO_4(s)

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A 45.2 mg sample of phosphorus reacts with selenium to form 131.6 mg of the phosphorus selenide. determine the empirical formula of phosphorus selenide. what will be the simplest molecular formula of this compound

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A 45.2 mg sample of phosphorus reacts with selenium to form 131.6 mg of the phosphorus selenide. determine the empirical formula of phosphorus selenide. what will be the simplest molecular formula of this compound

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Zinc and magnesium metal each reacts with hydrochloric acid to make chloride salts of the respective metals, and hydrogen gas. a 11.20-g mixture of zinc and magnesium produces 0.6854 g of hydrogen gas upon being mixed with an excess of hydrochloric acid. determine the percent magnesium by mass in the original mixture.

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The balanced chemical reaction is as shown below,

                 N₂ + 3H₂  –> 2NH₃

The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve for the unknown in this item. 

Since we are restricted only of the number of hydrogen, it becomes our limiting reactant. 

          (6 moles H2) x (2 moles NH3/3 moles H2) = 4 moles NH3

Therefore, given enough amount of N2, the amount of NH3 that can be formed out of the 6 moles of H2 is equal to 4 moles. 

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Natalia began to draw a diagram to compare bases and acids. Which label should be written in the area marked X? conducts electric current produces OH– ions tastes sour reacts with carbonates

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Answer:

1) Water has very high specific heat.

2) It expands when it freezes

3) ability to dissolve in ionic substances

4) Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid.

Explanation:

1) Water molecules due to their high specific heat , undergo relatively less increase in temperature after absorbing heat. So they prevent their adjoining area to experience sharp increase in temperature.

2) Water is an example which expands on freezing. In it , large spaces are left between molecules when it cools. It happens because hydrogen bonds prevent any two molecules to come very close thereby  creating gaps. This gap is filled up when ice melts , which results in overall reduction in volume of water.

3) Uneven distribution of charge results in water molecules becoming polar in nature . A polar substance  can be dissolved in polar solvents only.

4) It is due to property of surface tension. Property  of surface tension results due to molecules of water near the surface experiencing a  net downward  force due to hydrogen bonds . It is due to fewer hydrogen bonds made by them.

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Aqueous magnesium chloride and hydrogen gas are produced when solid magnesium reacts with aqueous hydrochloric acid (HCl). What is the equation for this reaction? Do not worry about balancing this equation.

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Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a) The given balanced ionic equation is,

Ni(NO_3)_2(aq)+Na_2S(aq)rightarrow NiS(s)+2NaNO_3(aq)

The ionic equation in separated aqueous solution will be,

Ni^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+S^{2-}(aq)rightarrow NiS(s)+2Na^+(aq)+2NO_3^-(aq)

In this equation, Na^+text{ and }NO_3^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

Ni^{2+}(aq)+S^{2-}(aq)rightarrow NiS(s)

(b) The given balanced ionic equation is,

NaNO_3(aq)+KBr(aq)rightarrow KNO_3(s)+NaBr(aq)

The ionic equation in separated aqueous solution will be,

Na^+(aq)+NO_3^-(aq)+K^+(aq)+Br^-(aq)rightarrow KNO_3(s)+Na^+(aq)+Br^-(aq)

In this equation, Na^+text{ and }Br^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

NO_3^-(aq)+K^+(aq)rightarrow KNO_3(s)

(c) The given balanced ionic equation is,

Li_2SO_4(aq)+BaCl_2(aq)rightarrow BaSO_4(s)+2LiCl(aq)

The ionic equation in separated aqueous solution will be,

2Li^+(aq)+SO_4^{2-}(aq)+Ba^{2+}(aq)+2Cl^-(aq)rightarrow BaSO_4(s)+2Li^+(aq)+2Cl^-(aq)

In this equation, Li^+text{ and }Cl^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

SO_4^{2-}(aq)+Ba^{2+}(aq)rightarrow BaSO_4(s)

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Identify the precipitate in this reaction: calcium nitrate reacts with sodium phosphate.

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Identify the precipitate in this reaction: calcium nitrate reacts with sodium phosphate.

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Aluminum metal reacts with iron(ii) sulfide to form aluminum sulfide and iron metal. what is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?

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Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a) The given balanced ionic equation is,

Ni(NO_3)_2(aq)+Na_2S(aq)rightarrow NiS(s)+2NaNO_3(aq)

The ionic equation in separated aqueous solution will be,

Ni^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+S^{2-}(aq)rightarrow NiS(s)+2Na^+(aq)+2NO_3^-(aq)

In this equation, Na^+text{ and }NO_3^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

Ni^{2+}(aq)+S^{2-}(aq)rightarrow NiS(s)

(b) The given balanced ionic equation is,

NaNO_3(aq)+KBr(aq)rightarrow KNO_3(s)+NaBr(aq)

The ionic equation in separated aqueous solution will be,

Na^+(aq)+NO_3^-(aq)+K^+(aq)+Br^-(aq)rightarrow KNO_3(s)+Na^+(aq)+Br^-(aq)

In this equation, Na^+text{ and }Br^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

NO_3^-(aq)+K^+(aq)rightarrow KNO_3(s)

(c) The given balanced ionic equation is,

Li_2SO_4(aq)+BaCl_2(aq)rightarrow BaSO_4(s)+2LiCl(aq)

The ionic equation in separated aqueous solution will be,

2Li^+(aq)+SO_4^{2-}(aq)+Ba^{2+}(aq)+2Cl^-(aq)rightarrow BaSO_4(s)+2Li^+(aq)+2Cl^-(aq)

In this equation, Li^+text{ and }Cl^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

SO_4^{2-}(aq)+Ba^{2+}(aq)rightarrow BaSO_4(s)

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Dante wants a cupcake, so he shoves tom aside. tom reacts by bopping dante over the head. tom is showing _____ aggression. reactive proactive indifferent relational

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Dante wants a cupcake, so he shoves tom aside. tom reacts by bopping dante over the head. tom is showing _____ aggression. reactive proactive indifferent relational

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Zinc reacts with aqueous sulfuric acid to form hydrogen gas: zn(s) h2so4(aq) ? znso4(aq) h2(g) in an experiment, 201 ml of wet h2 is collected over water at 27 °c and a barometric pressure of 764 torr. the vapor pressure of water at 27 °c is 26.74 torr. the partial pressure of hydrogen in this experiment is ________ atm

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Answer :  The partial pressure of He is, 270 Kpa

Solution :

According to the Dalton’s law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

P_T=p_{Ne}+p_{Ar}+p_{He}

where,

P_T = total partial pressure = 750 Kpa

P_{He} = partial pressure of helium = ?

P_{Ne} = partial pressure of neon = 230 Kpa

P_{Ar} = partial pressure of argon = 250 Kpa

Now put all the given values is expression, we get the partial pressure of the helium gas.

750Kpa=230Kpa+250Kpa+p_{He}

p_{He}=270Kpa

Therefore, the partial pressure of He is, 270 Kpa

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Carbon monoxide (CO) gas reacts with oxygen (O2) gas to produce carbon dioxide (CO2) gas. If 1.00 L of carbon monoxide reacts with excess oxygen at standard temperature and pressure, what volume of carbon dioxide is produced?

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Answer: Option (d) is the correct answer.

Explanation:

A hydrogen bond is defined as the bond formed between an electropositive atom that is, hydrogen and a strongly electronegative atom like oxygen, nitrogen, chlorine etc.

If a compound contains hydrogen atom and when it is put into water then it is able to combine with the hydrogen of water. Hence, then there will be disruption of bond.

On the other hand, a covalent bond is defined as the bond formed due to sharing of electrons between the combining atoms.

For example, C_{2} is a covalent compound and when it is dissolved in water then it will not dissociate into ions. Hence, it is difficult to disrupt its bond.

Whereas ionic bond is formed due to transfer of electrons from one atom to another. As water is also a polar compound so, ionic compounds are able to easily dissociate into ions when dissolved in water.

As a result, ionic compounds will also lead to disruption of bond.

Thus, we can conclude that covalent bonds between carbon atoms would be difficult to disrupt when compounds are put into water.

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An iron fence is left on painted and it reacts with the oxygen in the air form forming rust. the formation of the rest is an oxidation-reduction reaction but it is also an example of a _____ reaction (1 point)8. cooking requires continuous addition of energy to the chemical reactions the are taking place the chemical reaction involved in cooking can be described as______? (1 point)9. measuring how quickly a reactanat disappears in one way to measure the ______of the reaction

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Answer: The correct answer is option(A).

Explanation:

An iron atom emits particles when it is struck by light.This phenomena is called as Photoelectric effect.

Photoelectric effect is defined as when photons (particles of light) falls on the metallic surface, electrons from the surface are ejected out and these ejected out electrons are called photo electrons.

This phenomena was not explained by John Dalton’s model of the atom.

Where as John Dalton’s model of atom explains that matter is made up smallest indivisible particle that is atom, elements combines in fixed proportion with another elements to give compounds, chemical reaction is an arrangement of an atoms.

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