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3 years ago

Choose the three chemical properties of a penny

Chemistry

1 answer:

lukranit [14]3 years ago

3 0

The three chemical properties of a penny

Penny ( Pennies: plural; refer to a number of individual coins)

A chemical property of a substance is a characteristic of a particular substance that can be observed in a chemical reaction. Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.

<h3>What is chemical property?</h3>

The chemical properties of a substance can be determined by performing experiments that use specific materials or processes with known characteristics.

The following are three chemical properties to consider when choosing an element to make coins:

Reactivity to water.

Reactivity to oxygen.

malleability.

It should malleable, ductile, and an extremely good conductor of both heat and electricity.

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What is the name of the functional group that is attached to this hydrocarbon? The first and last of a chain of three carbons ar

vova2212 [387]

Answer:

Ketone

Explanation:

According to the description of the functional group attached to the hydrocarbon - the first and last of a chain of three carbons are each single bonded to 3 hydrogen (H)atoms; the center carbon is double bonded to an oxygen atom, O - it can be deduced that the functional group is a ketone group.

A ketone is a functional group with the structure R₂-C=O, where the two R are alkyl or phenyl groups which may be the same or different. The carbon in a double covalent bond with oxygen is called the carbonyl carbon. The two R groups are bonded to the carbonyl carbon in single covalent bonds.

In the hydrocarbon in this question, the two R groups are methyl groups, CH₃ bonded to the carbonyl carbon. The name of the hydrocarbon is propanone and it is a ketone molecule.

4 0

3 years ago

Read 2 more answers

Why are pure liquids and solids not included in the reaction quotient or the equilibrium constant expression for a given heterog

AfilCa [17]

Pure liquids and solids at the equilibrium stage:

Pure solids and pure liquids are not included in expressions for the equilibrium constant of heterogeneous equilibria since their concentrations are constant across time. Therefore, including it in our equilibrium expression is not significant.

Equilibrium expression:

When a certain chemical reaction is in equilibrium, the rates of the forward and backward reactions are equal, which means that there is no net change in the concentrations of the reactants and products and that the reaction mixture's composition does not change.

The concentration of solid and liquid:

Solid or liquid concentration,

= No. of Moles/ Volume in L

= Mass/(Volume × molar mass)

= Density/ Molar mass

Pure solids and liquids have constant densities and molar masses at a constant temperature.

Because of this, they have constant molar concentrations, which means that they are not considered in the equilibrium constant for a heterogeneous reaction.

Learn more about the pure solids, liquids, and heterogenous mixture here,

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3 0

2 years ago

A liquid used to dissolve a solid is referred to as:

ale4655 [162]

A solvent and an example would be water because it is polar and has the ability to dissolve many solutes, hence it is referred to as the universal solvent.

4 0

3 years ago

The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is -5,074 kJ/mol. This value is the Delta. Hrxn f

Inessa [10]

Combustion can be defined as the reaction of a compound with oxygen. The enthalpy of combustion of octane is $\Delta H_{\rm rxn}$ for $\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$ .

<h3>What is the enthalpy of reaction?</h3>

The enthalpy of reaction is the amount of heat energy absorbed or lost by the molecules in the chemical reaction.

The enthalpy of combustion is the amount of heat energy released by the compound in the reaction with oxygen.

The reaction in which heat is liberated with the reaction of a compound with oxygen has an enthalpy of combustion, equivalent to the enthalpy of reaction.

The combustion of octane can be given as:

$\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$

Thus, the reaction has combustion energy equivalent to the enthalpy of the reaction is $\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$ . Thus, option B is correct.

Learn more about enthalpy of reaction, here:

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6 0

3 years ago

Sodium symbol and charge, and use this to determine the compounds formula?

Leni [432]

Symbol          Name                    Symbol          Name

H+              hydrogen ion            H-              hydride

Li+             lithium ion             F-             fluoride

Na+             sodium ion              Cl-             chloride

K+              potassium ion           Br-             bromide

Rb+             rubidium ion            I-              iodide

Cs+             cesiumion              O2-              oxide

Be2+             beryllium ion           S2-              sulfide

Mg2+             magnesium ion           Se2-             selenide

Ca2+             calcium ion             Te2-             telluride

Sr2+             strontium ion           N3-              nitride

Ba2+             barium ion              P3-              phosphide

Ra2+             radium ion              As3-             arsenide

Ag+             silver ion

Zn2+             zinc ion                Al3+             aluminum ion

Note that the letters in an ion's name before the -ideending is the stem.

For example, the stem for bromide is brom-. Also, just in case, the P for

phosphide is a capital P.

Symbols and Charges for Monoatomic Ions

Variable Charge

        Systematic nameCommon                  Systematic name Common

Symbol  (Stock system)  name            Symbol  (Stock system)  name

Cu+     copper(I)       cuprous         Hg22+    mercury(I)      mercurous

Cu2+     copper(II)      cupric          Hg2+     mercury(II)     mercuric

Fe2+     iron(II)        ferrous         Pb2+     lead(II)        plumbous

Fe3+     iron(III)       ferric          Pb4+     lead(IV)        plumbic

Sn2+     tin(II)         stannous        Co2+     cobalt(II)      cobaltous

Sn4+     tin(IV)         stannic         Co3+     cobalt(III)     cobaltic

Cr2+     chromium(II)    chromous        Ni2+     nickel(II)      nickelous

Cr3+     chromium(III)   chromic         Ni4+     nickel(IV)      nickelic

Mn2+     manganese(II)   manganous       Au+     gold(I)         aurous

Mn3+     manganese(III)  manganic        Au3+     gold(III)       auric

Symbols and Charges for Polyatomic Ions

Formula         Name                    Formula         Name

NO3-             nitrate                 ClO4-            perchlorate

NO2-             nitrite                 ClO3-            chlorate

CrO42-           chromate                ClO2-            chlorite

Cr2O72-           dichromate              ClO-            hypochlorite

CN-             cyanide                 IO4-             periodate

MnO4-            permanganate            IO3-             iodate

OH-             hydroxide               IO-            hypoiodite

O22-             peroxide                BrO3-            bromate

NH2-             amide                   BrO-            hypobromite

CO32-            carbonate               HCO3-            hydrogen carbonate (bicarbonate)

SO42-            sulfate                 HSO4-            hydrogen sulfate (bisulfate)

SO32-            sulfite                 HSO3-            hydrogen sulfite (bisulfite)

C2O42-            oxalate                 HC2O4-           hydrogenoxalate (binoxalate)

PO43-            phosphate               HPO42-           hydrogen phosphate

PO33-            phosphite               H2PO4-           dihydrogen phosphate

S2O32-            thiosulfate             HS-             hydrogen sulfide

AsO43-           arsenate                BO33-            borate

SeO42-           selenate                B4O72-            tetraborate

SiO32-           silicate                SiF62-           hexafluorosilicate

C4H4O62-  tartrate

C2H3O2-           acetate  (an alternate way to write acetate is CH3COO-)

There is one positive polyatomic ion. It is NH4+and is called the ammonium ion.

Note: Writing just the plus sign or minus sign for ions with +1 or -1 charges is

acceptable.

Binary Compounds of Metals with Fixed Charges

Given Formula, Write the Name

A binary compound is one made of two different elements. There can be one of each element such as in NaCl or KF. There can also be several of each element such as Na2O or AlBr3.

Please remember that all elements involved in this lesson have ONLY ONE charge. That includes BOTHthe cation AND the anion involved in the formula.

Points to remember about naming a compound from its formula

1.        The order for names in a binary compound is first the cation, then the anion.

2.        Use the name of cation with a fixed oxidation state directly from the periodic table.

3.        The name of the anion will be made from the root of the element's name plus the suffix "-ide."

Example 1: Write the name of the following formula: H2S

Step #1 - Look at first element and name it. Result of this step = hydrogen.

Step #2 - Look at second element. Use root of its full name ( which is sulf-) plus the ending "-ide." Result of this step = sulfide.

These two steps give the full name of H2S. Notice that the presence of the subscript is ignored. There are other types of binary compounds where you must pay attention to the subscript. Those compounds involve cations with variable charges. Your teacher will tell you which ones you will be held responsible for.

Example 2: Write the name of the following formula: NaCl

Step #1 - Look at first element and name it. Result of this step = sodium.

Step #2 - Look at second element. Use root of its full name ( which is chlor-) plus the ending "-ide." Result of this step = chloride.

Example 3: Write the name of the following formula: MgBr2

Step #1 - Look at first element and name it. Result of this step = magnesium.

Step #2 - Look at second element. Use root of its full name ( which is brom-) plus the ending "-ide." Result of this step = bromide.

Note the presence of the subscript does not play a role in this name.

Example 4: Write the name of the following formula: KCl

The first part of the name comes from the first element symbol: potassium. The second part of the name comes from the root of the second symbol plus '-ide,' therefore chlor + ide = chloride.

This compound is named potassium chloride

Example 5: Write the name of the following formula: Na2S

First symbol is Na, so the first part of the name is sodium. (Note the presence of the subscript does not play a role in this name.) Second element is sulfur (from the symbol S), so the name is sulf + ide = sulfide.

6 0

4 years ago