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3 years ago

Chose all of the correct statements pure vs mixture

Chemistry

1 answer:

GarryVolchara [31]3 years ago

6 0

Answer:

I think that a pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.

Explanation:

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What's CO2 please explain in detail

Leokris [45]

Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. It is often referred to by its formula CO2. It is present in the Earth's atmosphere at a low concentration and acts as a greenhouse gas. In its solid state, it is called dry ice. It is a major component of the carbon cycle.

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3 years ago

How many grams of Ca(OH)2 are needed to produce 500 mL of 2.99 M Ca(OH)2 solution? 1L=1000mL

Alex_Xolod [135]

Answer:

74 g/mol

Explanation:

Using a periodic table, we can determine the molar mass by adding together 1 Ca, 2 O, and 2 H. This turns out to be approximately (40+32+2) = 74 g/mol

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3 years ago

How much 6.0M HNO(small 3) is needed to neutralize 39mL of 2 M KOH

Digiron [165]

Equation of reaction
KOH+HNO3--->KNO3+H2O 
CA=6.0M, CB=2.0M, VA=?, VB=39ml, na=1, nb=1 
CAVA/CBVB=na/nb 
6*VA/2*39=1/1 
6VA/78=1 
6VA=78 
VA=78/6. VA=13ml. 
VA=13ml.
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3 years ago

There are two stereoisomers of 1-tert-butyl-4-chloro-cyclohexane. One of these isomers reacts with sodium ethoxide in an E2 reac

Naily [24]

Answer:

Explanation:

Answer:

cis-isomer reacts faster

Explanation:

The missing diagrams in the question are attached in the first image below and the isomers that react faster are shown in the second image attached.

The cis-isomer quickly follows E2 reaction due to the fact that it is locked in a chair conformation whereby chlorine dominates an axial position, as displayed in drawing C as well as the leaving group Cl which is antiperiplanar to a beta proton.

Due to the bulkiness of tert-butyl, the trans-isomer is Basically trapped in a chair configuration, with chlorine occupying an equatorial position as displayed in drawing A below, thus leaving the group isn't antiperiplanar to a beta proton.

Tert butyl favors an equatorial position due to its bulkiness. This makes the Cl to assume an axial position in an isomer

The difference:

From the second image attached below, in the first diagram(1):

Suppose H is antiperiplanar, C-H bond electrons reach antibonding orbitals of C-Cl, assisting in the breakdown of the C-Cl bond and therefore speeding up the process.

From the second diagram(2) in the second image:

Unless Cl is in the axial position would it have β-hydrogen in the antiperiplanar position. Because tert-butyl prefers equatorial location, the Cl occupies equatorial position in the trans isomer.

As a result, the reaction is slower and there is no β-hydrogen antiperiplanar to Cl.

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3 years ago

How does knowing the reactants and products help you classify a chemical reaction? Write a short paragraph explaining.

Helen [10]

A common clasiffication of the chemical reactions is as combination (or synthesis), decomposiion, single replacement and double replacement. Knowing the reactants and products you can tell to which one of those four classifications a reaction pertains. When two reactants combine into a single product, it is a combination (syntheisis) reaction. When a single reactant yields two or more products, it is a decomposition reaction. When the cation of a single element, replaces the cation in a compound, it is a single replacement. When the cations of two different reactants exchange and end combined with the anions of the others compounds, it is a double replacement reaction.

6 0

3 years ago

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