Answer:
A
Explanation:
In a simple perspective, an ion of an element is an element +- [tex]n[/tex] amount of electrons.
We know that electrons have atomic mass, so we can mark off D
We know that with more or fewer electrons, the electron configuration would change
However, the number of protons won't change in the ion of an element, this is because an ion is only the change in electrons, not protons or neutrons (the particles that make up a nucleus of an atom)
The valence electrons found in metallic bonds are different from other bonds
because
A. their valence electrons are immobile
B. they allow for the conductivity of electricity
c. they're able to share electrons with other atoms
D. their valence electrons are free-roaming
SUBMIT
Answer:
D.) their valence electrons are free-roaming
Explanation:
Metals tend to arrange themselves in crystalline structures once they form metallic bonds. The electrons around the positive nuclei are delocalized, and thus freely float within the structure. This is unique to metallic bonding.
when a candle burns what changes are observed?
Answer:
it's state changes from solid to liquid
4 and 5 pls and thank uuu
Answer:
4. -ol
5. cyclic ketone
Explanation:
biology stuff
sorry it's hard to explain
A neutral atom has high electronegativity.
Describe what happens to this atom during ionic bond formation.
Please get it cleared and stored into your cerebrum that a cation is formed when a neutral atom loses one or more electrons from its valence electron shell.
However too, on other hand an anion is formed when a neutral atom gains one or more electrons in its outermost electron shell.
A cation means a positive ion
An anion means a negative ion
What is electronegativity?Electronegativity is one of physical periodicity and property of elements that describes the tendency of an atom to attract electrons toward itself.
Generally, electronegativity of an atoms of elements in a particular trend is affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei.
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C₃H₈ (g) + 5O₂ (g) --> 3CO₂ (g) + 4H₂O (l) would be best classified as which type of reaction?
precipitation
acid-base
combustion
single displacement
The pressure in car tires is often measured in pounds per square inch ( lb/in.2 ), with the recommended pressure being in the range of 25 to 45 lb/in.2 . Suppose a tire has a pressure of 32.5 lb/in.2 . Convert 32.5 lb/in.2 to its equivalent in atmospheres.
Express the pressure numerically in atmospheres.
when we convert 32.5 lb/in² to atmosphere, the result obtained is 2.21 atm
Conversion scale14.6959 lb/in² = 1 atm
Data obtained from the questionPressure (in lb/in²) = 32.5 lb/in²Pressure (in ATM) =?How to convert 32.5 lb/in² to atm14.6959 lb/in² = 1 atm
Therefore
32.5 lb/in² = 32.5 / 14.6959
32.5 lb/in² = 2.21 atm
Thus, 32.5 lb/in² is equivalent to 2.21 atm
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pls help question is above
a. The calories increase by 9:00 whenever the running speed goes up by two. so so if a dog were running at 10 km/h it would be 54 calories burnt
b. they are multiplied by 9
If 48.0 g of iodine are reacted with an excess of phosphorus according to the following chemical equation:
2 P(s) + 3 I2(s) → 2 PI3(s)
Calculate the theoretical yield of PI3.
If the actual yield of PI3 is 50.0 g, what is the percentage yield?
Answer:
Theoretical Yield = 51.9 grams PI₃
Percentage Yield = 96.3% PI₃
Explanation:
To find the theoretical and percent yield of PI₃, you need to (1) convert grams I₂ to moles I₂ (via molar mass), then (2) convert moles I₂ to moles PI₃ (via mole-to-mole ratio from reaction coefficients), then (3) convert moles PI₃ to grams PI₃ (via molar mass), and then (4) calculate the percent yield. It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answers should have 3 sig figs to match the sig figs of the given values.
Molar Mass (I₂): 2(126.90 g/mol)
Molar Mass (I₂): 253.8 g/mol
Molar Mass (PI₃): 30.974 g/mol + 3(126.90 g/mol)
Molar Mass (PI₃): 411.674 g/mol
2 P(s) + 3 I₂(s) -----> 2 PI₃(s)
48.0 g I₂ 1 mole 2 moles PI₃ 411.674 g
--------------- x ----------------- x ---------------------- x ------------------ =
253.8 g 3 moles I₂ 1 mole
= 51.9 g PI₃
Actual Yield
Percentage Yield = --------------------------------- x 100%
Theoretical Yield
50.0 g PI₃
Percentage Yield = -------------------- x 100%
51.9 g PI₃
Percentage Yield = 96.3% PI₃
convert ethene to propanamine
STEP 1: ON TREATING CHLOROETHANE WITH KCN WE GET PROPANE - NITRILE . STEP 2: ON TREATING PROPANE - NITRILE WITH LiAlH4 WE GET PROPANAMINE.
Activity
In this activity, you will examine the difference between opinions, facts, theories, and laws. To do so, examine the table
below. Carefully read each example in the table before answering the questions thatfollow.
Opinions are differ from facts as that we cannot change the facts but opinions can be changed as in first example it is given anthracite is better than bituminous coal may be there is another coal which is more better than anthracite. So here opinion is changed.
What is Coal ?It is a black or brownish black sedimentary rock. It contains Sulphur, hydrogen, oxygen, carbon etc. It is always preferred as fuel. Coal was formed millions years ago when plant decay in the soil. It is obtained from dead vegetation. It is obtained from dead plants matter decay into peat and then it is converted into the coal by the process of heat.
What is Solar System ?Solar System is made up of all the planets that revolve around our Sun. Solar System contains eight planets. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Thus from the above conclusion we can say that Opinions are differ from facts as that we cannot change the facts but opinions can be changed as in first example it is given anthracite is better than bituminous coal may be there is another coal which is more better than anthracite. So here opinion is changed.
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Write the balanced molecular equation for the aqueous reaction of hydroiodic acid (HI) and zinc metal.
The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now write the balanced chemical equation
Zn + 2HI → ZnI₂ + H₂
Here Zn is a reducing agent, HI is an oxidizing agent.
Thus from the above conclusion we can say that The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.
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A liquid has q voulume of 34.6 mL and a mass of 46.0g ehat is the density of the liquid
Answer:
1.33 g/mL
Explanation:
The density of a substance can be calculated using the following formula:
Density = mass (g) / volume (mL)
Since you have been given both the mass and volume, you can easily calculate the density of the liquid.
Density = mass / volume
Density = 46.0 g / 34.6 mL
Density = 1.33 g/mL
4NH3+5O2=4NO+6H20 if 32.5 grams of NH3 react with enough oxygen, how many grams of water should form?
51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.
How to find the Number of moles ?To calculate the number of moles use the formula
Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]
= [tex]\frac{32.5}{17}[/tex]
= 1.9 mol
4NH₃ + 5O₂ → 4NO + 6H₂O
4 mol of NH₃ react with oxygen to given 6 mole of water.
So 1.9 mol of NH₃ produces = [tex]\frac{1.9}{4}\times 6[/tex]
= 2.85 mol of water
Mass of water = Molar Mass of water × Number of moles of water
= 18 × 2.85
= 51.3 gram
Thus from the above conclusion we can say that 51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.
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The protons of a __________ acid would be completely transferred to the solvent when dissolved.
Group of answer choices
inert
neutral
strong
weak
The protons of a strong acid would be completely transferred to the solvent when dissolved.
What is an acid?An acid is defined as a substance that contains hydrogen that it can donate when reacting with another substance.
There are two main types of an acid which include:
weak acids andstrong acids.A strong acid is a type of acid that has the ability to donate it's hydrogen/ protons completely in a chemical reaction.
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Determine the molecular shape of each of the following species.
Answer:
See-saw
Explanation:
To determine the molecular shape of BrF₄⁺, you need to
1.) Calculate the valence electrons of BrF₄⁺
----> Add the valence electrons of each individual atom
----> Take the positive charge into account (subtract 1 electron)
2.) Draw the Lewis Dot diagram of BrF₄⁺
----> Each bond has 2 electrons
----> Bromine can have an expanded octet
3.) Determine the molecular shape of BrF₄⁺
How to convert butanoic acid to propanamide?
Butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.
How are carboxylic acids converted to amides?Carboxylic acids are converted to amides by converting them into into an ammonium salt which then produces an amide on heating.
The ammonium salt is prepared by adding ammonium carbonate to an excess of the acid. The ammonium salt is then heated to give the amide
Therefore, butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.
In conclusion, carboxylic acids are converted to amides in two steps.
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18. What is assigned a rating of 3 in the yellow diamond of the NFPA 704 symbol.
OA. Helium
OB. Sodium
OC. Ammonium nitrate
OD. Chlorine dioxide
Why is scientific notation used?
to round numbers to the nearest whole number
to promote reproducibility of data
to increase the validity of data
to express very large or very small numbers
The correct option is (d) To express very large or very small number.
What is the Scientific Notation?
Scientific notation is a way to present numbers that are too large or too small to be easily written in decimal form. The three components of scientific notation are coefficient, base and exponent. The proper format to write a scientific notation is a x 10^b, where a is a number or decimal number and b is the power of 10 to make scientific notation equivalent to original number. When a number between 1 and 10 is multiplied by a power of 10 then the number is expressed in scientific notation. For example, 10000000 can be written as 10⁷, which is the scientific notation and the exponent is positive here. Similarly, for the negative exponent 0.000001 can be can be represented as 10-⁷. Hence, the scientific notation is used to express very large or very small numbers.
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Identify the chirality center (sometimes called chiral atom) in each molecule. If the molecule does not contain a chirality center, select none.
The only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.
What is a chiral center?The term chiral center refers to a carbon atom that is attached to four different atoms or groups. This kind of carbon atom is able to rotate the direction of plane polarized light.
We can see from the structure of the molecule that the only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.
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Lactic acid has a pKa of 3.08. What is the approximate degree of dissociation of a 0.35 M solution of lactic acid?
The approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%
What is degree of dissociation?The degree of dissociation is the quantity used to express the strength of a base, that is, its ability to conduct electric current, which depends on the amount of ions released in the dissociation.
The degree of dissociation (α) is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.
With that being said, C stands for concentration and α is the the degree of dissociation.
Latic Acid can be written as C3H6O3
[tex]CH3Ch(OH)CO2H < -- > H^{+} + CH3CH(OH)CO2^{-}[/tex]
[tex]Ka = \frac{[H^{+}] [CH3CH(OH)CO2^{-}] }{CH#CH(OH)CO2H} = \frac{C^{2} \alpha^{2} }{C(1-\alpha )} = \frac{C\alpha ^{2} }{(1-\alpha )}[/tex]
As α is too small (1-α) can be neglected.
[tex]Ka = C\alpha ^{2} \\\\\\alpha = \sqrt[]{\frac{Ka}{C} }[/tex]
[tex]Ka = 10^{-3,08} = 8,32 .10^{-4} .10^{-4} = 0,35[/tex]
[tex]\alpha = \sqrt{\frac{ka}{C} } \\\\\alpha = \sqrt{\frac{8,32.10^{-4} }{0,35} } = 0,0487[/tex]
In this case, is possible to see that approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%
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For the balanced equation: 2H2S + 3O2 → 2SO2 + 2H2O
How many moles of sulfur dioxide will be produced from the reaction of 12 moles of oxygen?
Answer:
8 moles SO₂
Explanation:
To find the moles SO₂, you need to multiply the given value by the mole-to-mole ratio. This ratio, between O₂ and SO₂, is made up of the coefficients from the balanced equation.
2 H₂S + 3 O₂ -----> 2 SO₂ + 2 H₂O
12 moles O₂ 2 moles SO₂
-------------------- x ---------------------- = 8 moles SO₂
3 moles O₂
What would the pH of a solution that had a hydroxide ion concentration of 1 x 10-2 M be?
Taking into account the definition of pH and pOH, the pH of the solution is 12.
Definition of pHpH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Definition of pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
pH in this caseA solution had a hydroxide ion concentration of 1×10⁻² M. In other words [OH⁻]= 1×10⁻² M.
Replacing in the definition of pOH, it is calculated as:
pOH= - log (1×10⁻² M)
Solving;
pOH= 2
Replacing in the relationship established between pH and pOH, the pH can be calculated as:
pH + 2= 14
Solving:
pH= 14 - 2
pH= 12
In summary, the pH of the solution is 12.
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Which scenario would be classified as a conceptual model?
A. A student thinks of bouncing balls as representing gas molecules.
B. Marshmallows and toothpicks are used to show the composition
of a water molecule.
C. A map and a map scale are used to represent a larger area of land.
D. A weather map shows different temperatures over most of the
United States.
The correct answer is A. A student thinks of bouncing balls as representing gas molecules.
What is molecules?When one effectiveness liquefies into another, a resolution is formed. A solution is a homogenous mixture consisting of a solute liquefied into a solvent. The solute is the substance that is being dissolved, while the solvent is the dissolving medium.
Solutions can be formed with numerous different varieties and forms of solutes and solvents. In this department, we will focus on a solution where the solvent is water. An aqueous solution is moisture that contains one or more additional dissolved essence. The dissolved importance in an aqueous resolution may be solids, gases, or different liquids.In directive to be a true explanation, a variety must be stable. When sugar is fully dissolved into water, it can stand for an indefinite quantity of time, and the sugar will not recompense out of the solution. Further, if the sugar-water solution is passed through a filter, it will remain with the water. This is because the liquefied particles in a solution are very small, usually smaller than 1nm in diameter. Solute particles can be particles, ions, or molecules, counting on the classification of nature that has been dissolved.To learn more about molecules, refer to:
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A student measures the length of an object to be 152 cm. What is the measurement in km?
Answer:
0.00152 km
Explanation:
The easiest way to complete the conversion is by (1) converting cm to m and then (2) converting m to km. It is important to arrange the conversions in a way that allows for the cancellation of units.
1,000 m = 1 km
100 cm = 1 m
152 cm 1 m 1 km
------------- x -------------- x ---------------- = 0.00152 km
100 cm 1,000 m
[tex]\large\displaystyle\text{$\begin{gathered}\sf So \to \ \ 152\not{cm}*\frac{1 \ km}{100,000\not{cm}}=0.00152 \ km \end{gathered}$}[/tex]
Answer:Therefore, the measurement of the object in km is: 0.00152 Kilometers.
I hope my answer is useful to you
Hi I need help with the Lab report for the 'Flame Lab' in edge
Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.
What is Flame Test ?A Flame test is used to identify the metal and metalloid ion in the sample. Flame test is a qualitative test. Not every metal ion emit color when it is heated in the gas burner.
What is the Purpose of Flame test ?The purpose of flame test is used to find the identities of ions in two solutions of unknown composition by comparing the colors they produce.
What are the material used ?Bunsen Burner MatchesGlovesWeighing dishes BeakersThus from the above conclusion we can say that Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.
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Because of a scarcity of workers in the New World, persons were transported against their will to work on large farms without pay and under difficult conditions. Which of the following best describes this?
British indentured servant
Enslaved African
Spanish conquistador
French fur trapper
Enslaved African is best described as the condition which involved transporting people against their will to work on large farms without pay.
What is Slavery?This is referred to a situation in which an individual is owned by another. Slaves were moved from Africa against their will to work on large farms.
They weren't given any pay and worked under hard conditions thereby making option B the correct choice.
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How many molecules of zinc oxide are there in a 2 kg sample?
There are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample. Details about number of molecules can be found below.
How to calculate number of molecules?The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.
According to this question, there are 2000g of ZnO in a sample. Zinc oxide has a molar mass of 81.38 g/mol.
no of moles = 2000g ÷ 81.38g/mol
no of moles = 24.57mol
number of molecules = 24.57 × 6.02 × 10²³
number of molecules = 147.95 × 10²³
Therefore, there are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample.
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In this reaction, how many grams of CH4 would be formed from 25 g C?
C + 2H2 → CH4
33.33 grams of CH4 would be formed from 25 g C.
C + 2H2 → CH4
from given reaction we can say that ,
2 moles of hydrogen is required for 1 mole of carbon and these will react to form 1 mole of methane.
atomic mass of Carbon = 12 gm
Molecular mass of H2 = 2(H)
= 2(1)
=2gm
moles = molecular mass / given mass
for C,
if 12 gm = 1 mole
then 25 gm = ? mole
=2.083 moles
1 mole of C will produce 1 moles of CH4
so, 2.083 moles of C also will produce 2.083 moles moles of CH4
molecular weight of methane= C+4(H)
= 12+4(1)
= 16 gm
amount of methane produced= moles × molecular mass
=2.083× 16
= 33.33 gm
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A gas company in Massachusetts charges $1.30 for 17.0ft³ of natural gas. Convert this rate to dollars
per liter of gas.
Answer:
See below
Explanation:
Conversion factor : 1 ft^3 = 28 .317 liters
$ 1.30 /( 17 ft^3 * 28.317 liters/ft^3) = $.0027 per liter
1. Based on the observed performance of the air bag models and the amounts of sodium bicarbonate and acetic acid (vinegar) needed for an automotive air bag of 80 or 160 L, are these reactants a good substitute for sodium azide? One additional note regarding sodium azide: the rate of inflation after a triggering impact is 40 milliseconds (0.04 s).
Sodium bicarbonate and acetic acid are not good substitute for sodium azide in airbags since the require more mass and produce less gas.
Which is the better chemical for an airbag?The chemical equation for the production of nitrogen gas from sodium azide is given below:
NaN₃ → 2 Na + 3 N₂1 mole or 66 go of sodium azide produces 3 moles or 67.2 L of nitrogen gas.
The equation for the production of carbon dioxide from sodium bicarbonate and acetic acid is given below:
Na₂CO₃ + CH₃COOH → CH₃COONa + CO₂ + H₂O1 mole, 106 g of Na₂CO₃ and 1 mole, 82 g of CH₃COOH are required to produce 1 mole or 22.4 L of CO₂.
The mass of sodium azide required is less than that of sodium bicarbonate and acetic acid required. Also, sodium azide produces a greater volume of gas. Therefore, sodium bicarbonate and acetic acid are not good substitute for sodium azide in airbags.
In conclusion, sodium azide is a better choice in airbags.
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