What is true when two reactants combine in an exothermic reaction?

Answers

Answer 1

Answer: Rxn releases energy in the form of heat or light.
Which is the opposite of an endothermic rxn because endo. rxn requires energy to form the product.

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Consider the following reaction: 2Mg(s)+O2(g)-->2MgO(s) delta H=-1204kJa) Is this reaction exothermic or endothermic? exothermic endothermicb) Calculate the amount of heat transferred when 3.55 g of Mg(s) reacts at constant pressure. delta H = -87.9 kJc) How many grams of MgO are produced during an enthalpy change of -238 kJ ? m = ?gd) How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure? delta H =? kJ

Where was Freon used prior to the ban on CFCs?

Answers

Answer:

The majority of automobiles manufactured prior to 1994

Explanation:

their A/C systems. Since that time, several non-CFC refrigerants such as hydrofluorocarbons (HFCs) have been developed; and many more are in the development process

What type of mixture scatters light and cannot be filtered? a colloid, a heterogeneous mixture a solution, a heterogeneous mixture a colloid, a homogeneous mixture a solution, a homogeneous mixture

Answers

the type of mixture that scatters light and cannot be filtered is : A colloid

Colloids include gels, sols, and emulsions and it consist of non-crystalline substance that has large molecules

hope this helps

Colloids. The particles are usually clumpy.

Questions about Ozone

Answers

The exothermic step in ozone reactions is O₃ → O₂ + O. The most endothermic step is 3O₂ → 2O₃ because it needs energy to break the double bond in O₂. Ozone can be decomposed by light with a longer wavelength because the O-O bond in ozone is weaker than the O=O double bond in oxygen.

The reactions mentioned are involved in the ozone production and destruction in the atmosphere. The first reaction : 3O₂ → 2O₃ is an endothermic process as it needs energy (in the form of UV light) to break the double bond in O₂ and form O₃. However, the reaction : O₃ → O₂ + O is exothermic. It involves the breaking of the weaker bond in O3 and formation of a stronger O₂ molecule and oxygen atom. Thus, the answer to part (a) would be the step O₃ → O₂ + O.

For part (b), the most endothermic step would again be 3O₂ → 2O₃. Lastly, the explanation of why ozone can be decomposed by light with a longer wavelength than that required to decompose oxygen is because the O-O bond in ozone is weaker than the O=O double bond in oxygen. Hence, it requires less energy (or light of longer wavelength) to break the O-O bond in ozone, leading to its decomposition.

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The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in the reactants? 2 H2O 2H2 + O2

Answers

Answer : The number of oxygen atoms present on reactant side are, 4

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

Decomposition reaction : It is defined as the reaction in which the larger molecule decomposes to give two or more smaller molecules as a product.

The given balanced chemical reaction is,

$2H_2O\rightarrow 2H_2+O_2$

From the balanced chemical reaction we conclude that, there 4 atoms of hydrogen and 2 atoms of oxygen present on both reactant side and product side.

Hence, the number of oxygen atoms present on reactant side are, 4

2 atoms of oxygen are reactants.

If atoms are made of smaller parts such as electrons, why are atoms considered the basic unit of matter?

Answers

Atoms are considered the basic unit of matter because it is atoms that make up the elements which in turn combine to form compounds that exist in all states. It is true that atoms are made up of electrons and neutrons and protons, but they are not useful on their own individual level. Like, you don't hear anyone say that "the particles that make up atoms are the basic unit of matter".

Explanation:

Atoms are considered as the basic unit of matter because atoms combine to form matter. Atoms combine to form elements and compounds which further make up the atom.

Atoms contain electron, proton and neutrons. Electrons are negatively charged particles. They do not combine to form matter. A stable atom is a combination of fixed number of electrons, protons and neutrons.

Distillation is used to separate _____.a. heterogeneous mixtures
b. suspensions
c. colloids
d. solutions

Answers

Distillation is the process of separating homogeneous mixtures -and a solution is a homogenous mixture, so this is the correct answer!

A homoogeneous mixture is a mixture in which the elements are mixed so well, that the mixture has a similar composition in all its parts. A heat can be applied to this mixture then to separate the parts - this is destination!

The answer is A) heterogeneous mixtures, look up how a heterogeneous mixture is separated and it will tell you distillation. Have a nice day and good luck on the rest of your work

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