What is the equation for density?
O D= m
V
OD=V
m
OD=m
OD=mv²

Answer:The first model (full container) represented matter that has a definite shape. The particles were packed tightly and did not have the freedom to rearrange themselves.

Explanation:

we cant

Explanation:

you need to leave some water to stop dehydration of substance

When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample by evaporating it to dryness because ammonium chloride is a salt that decomposes upon heating.

When heated, ammonium chloride undergoes sublimation, which means it directly changes from a solid to a gas without passing through a liquid phase. This process would lead to the loss of the compound, and we would not be able to obtain a pure and dry sample.

Instead, other methods such as vacuum drying or desiccation are used to remove moisture from ammonium chloride without causing decomposition.

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The freezing point depression is 2.1 °c.

The freezing point is the point that a liquid is converted to solid. Now we know that the freezing point is a colligative property.

Number of moles of glucose =  10.0g /180 g/mol =0.056 moles

Mass of water =  50.0g or 0.05 Kg

Molality of the solute = 0.056 moles/ 0.05 Kg = 1.12 m

The freezing point depression is obtained from;

ΔT = K m i

ΔT = 1.86°c/m *  1.12 m * 1

ΔT = 2.1 °c

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The likely thing which happens when two atoms of this element move toward each other is covalent bonding.

This involves the atoms of element sharing electrons in order to achieve a stable octet configuration.

The element is oxygen which has an atomic number of 8 and needs two electrons to complete its outermost shell which results in the formation of two covalent bonds.

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Hello and Good Morning/Afternoon

Let's consider all the choices to determine the attributes of isotopes

        ⇒ isotopes are often found in nature as they are often the atoms

            that form the world around us

        ⇒ isotopes describe a certain type of atom with a certain

             characterist that exists, thus it isn't theoretical

        ⇒ as said before, isotopes are found in nature and form the world

        ⇒Isotopes are a type of atoms thus they are found in nature

Answer: (D)

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Answer:

D. found in nature.

Explanation:

Isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.  An isotope of an element is just a version of that element with a particular number of neutrons. Some numbers are stable, some are not; the ones that aren't shoot particles out at extremely high speeds ("radiation").

Since radioisotopes generally have the same chemistry as their stable counterparts (since neutrons play almost no role in chemistry), they'll get wherever other atoms of that element would get. Iodine, for example, accumulates in your thyroid gland - so do radioactive forms of iodine, which can then cause thyroid cancer by irradiating it from the inside.

Also because they're chemically almost indistinguishable, they're almost impossible to separate out by any normal means. It's like giving someone a giant bin of golf balls, some of which are 1% heavier than the other golf balls but are otherwise exactly the same, and saying "okay, sort these". Except the golf balls are atoms and the bin is the size of a small country.

Incomplete combustion does not form water and carbon dioxide when it burns.

A fuel receives enough oxygen to complete combustion when it burns in a lot of air.

Fuels like gasoline and natural gas contain hydrocarbons. These are only hydrogen and carbon compounds. When they totally burn:

The hydrogen oxidizes to water while the carbon turns into carbon dioxide (remember that water, H2O, is an oxide of hydrogen)

for full combustion:

hydrocarbon + oxygen→Carbon dioxide + water

The following equations describe how propane, which is used in bottled gas, completely burns.

oxygen + propane→carbon dioxide + water

C3H8 + 5O2 → 3CO2 + 4H2O

When there is insufficient air or oxygen present, incomplete combustion ensues. Carbon dioxide is still created, but it is replaced with carbon monoxide and carbon.

For incomplete combustion in general:

Hydrocarbon + Oxygen→ Carbon Monoxide + Carbon+ Water

incomplete propane combustion, which results in the production of carbon rather than carbon monoxide

oxygen + propane→carbon + water

C3H8 + 2O2 → 3C + 4H2O

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Answer:

Minerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock that are high enough to be economically extracted for use. All ores are minerals, but all minerals are not necessarily ores.

Hope its helpful!

Minerals are inorganic solids that develop in nature and have a crystalline structure as well as a specific spectrum of chemical formulas. Ores are areas of mineral concentration in rock that may be economically mined for use. Lodestone is one of the iron ores. The mineral known as ore is where metal is easily and affordably mined. The composition of ore is known. Minerals are naturally occurring metals that are found in the crust of the planet. Ores are minerals that can be utilized to profitably extract metal.

If the molecules of air are added continuously to the inflatable bag of the car then the pressure of the molecule will decrease as given by Boyle's law.

Boyle's law is a gas law that establishes the relation between the volume and the pressure of the gas. It states the inverse correlation between the two factors respective to the constant temperature.

Boyle's law is given as:

P₁V₁ = P₂V₂

Where an increase in the volume will decrease the pressure of the gas. So, if the air molecules are added to the bag then the pressure inside will reduce.

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The partial pressure of oxygen, P(O₂) is 198.83 mmHg.

The partial pressure of a gas is the pressure gas will exert in a mixture of gases which do not react chemically together.

The sum of partial pressure of gases at atmospheric pressure = 760 mmHg

P(N₂) +  P(H₂O) + P(CO₂) + P(O₂) + P(other) = 760 mmHg

P(N₂) = 0.72 atm = 547.2 mmHg

P(H₂O) = 7.7 torr = 7.7 mmHg

P(CO₂) = 0.37 mmHg

P(other) = 0.97 kPa = 5.9 mmHg

P(O₂) = 760 - (547.2 + 7.7 + 0.37 + 5.9) = 198.83 mmHg

Therefore, the partial pressure of oxygen, P(O₂) is 198.83 mmHg.

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The volume of the radiator solution formed with the 197 mL of antifreeze is 788 mL.

A percentage is given as the respective ratio of the quantity present with respect to others.

The solution of 25% v/v can be depicting the presence of a 25% volume of antifreeze in the radiator solution.

The volume of the radiator solution has 197 mL of antifreeze. The total volume of the solution suppose is x.

25% of x = 197 mL

25/100 * x = 197

x = 788 mL

The volume of the radiator solution formed with 25% v/v antifreeze is 788 mL.

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Xylene moles =\frac{17.12}{106.16×1000}=0.00016moles=

106.16×1000

17.12

=0.00016moles

Moles of CO_2 =\frac{56.77}{44.01×1000}=0.0013CO

2

=

44.01×1000

56.77

=0.0013

Moles of H_2O= =\frac{14.53}{18.02×1000}=0.0008H

2

O==

18.02×1000

14.53

=0.0008

Moles ratios

\frac{0.0013}{0.0008}=1.625

0.0008

0.0013

=1.625

\frac{0.0008}{0.0008}=1

0.0008

0.0008

=1

Hence molecular fomula

The empirical formula is C 4H 5.

The molecular formula C8H10

The balanced hydration equation for Silicon phosphate is as follows: Si3(PO4)4 + 6H2O → 3SiO2 + 4H3PO4.

Hydration is the incorporation of water molecules into a complex with those of another compound.

According to this question, silicon phosphate with a chemical formula of Si3(PO4)4 is hydrated to produce silicon oxide and phosphoric acid as follows:

Si3(PO4)4 + H2O → SiO2 + H3PO4.

However, this equation is not balanced as the number of moles of each element on both sides is not the same. The balanced equation is as follows:

Si3(PO4)4 + 6H2O → 3SiO2 + 4H3PO4

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The enthalpy change of the reaction, ΔH = -311 kJ

Enthalpy change involved in the reaction of 300 g of CO = -10972.5 kJ

The enthalpy change for the reaction is obtained from the summation of the enthalpies of the reactions of the intermediate steps according to Hess's law.

The equation of the reaction is given below:

The enthalpy of the reaction, ΔH = ΔH₁ + 2ΔH₂ + (-ΔH₃)

ΔH = {(-1299) + (2 * -286) + (1560)}Kj

ΔH = -311 kJ

The equation for the methanation reaction is given below:

3 H₂O + CO → CH₄ + H₂O

The enthalpy for the methanation reaction is as follows:

ΔH = 1.5ΔH₁ + 0.5*(-ΔH₂) + ΔH₃ + -ΔH₄

ΔH = (-483.6 * 1.5) + (0.5 * 221.0) + (-802.7) + (393.5)

ΔH = -1024.1 kJ/mol

Molar mass of CO = 28 /mol

Enthalpy change involved in the reaction of 300 g of CO = 300/28 * -1024.1 kJ/mol

Enthalpy change involved in the reaction of 300 g of CO = -10972.5 kJ

In conclusion, the enthalpy changes are calculated from the enthalpy values of the  intermediate reactions.

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Answer:

2.) C₆H₆O₂

Explanation:

(Step 1)

To find the molecular formula of hydroquinone, you need to first determine the molar mass of the empirical formula. The molar mass is a sum of the individual atomic weights of each element multiplied by their quantities (denoted by the subscripts).

Atomic Weights:

Carbon (C): 12.011 g/mol

Hydrogen (H): 1.008 g/mol

Oxygen (O): 15.998 g/mol

Molar Mass (C₃H₃O): 3(12.011 g/mol) + 3(1.008 g/mol) + 15.998 g/mol

Molar Mass (C₃H₃O): 55.055 g/mol

(Step 2)

As you can see, the molar mass of the empirical formula is not the same as the molar mass of the molecular formula. Rather, the empirical molar mass is approximately half of the molecular molar mass. Therefore, to make these masses equal, we need to double the empirical formula. This can be done by multiplying all of the subscripts by 2.

55.055 g/mol x 2 = 110.11 g/mol

110.11 g/mol = 110.108 g/mol

C₃ x 2 = C₆

H₃ x 2 = H₆

O x 2 = O₂

Therefore, the correct molecular formula of hydroquinone is C₆H₆O₂.

The correct statement is Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

In a simple way to explain, Isotopes are species that have the same atomic number and mass number.

In this case, we can say that the correct statement is proton number of isotopes of an element is same.

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Answer:

the compound is bromine trifluoride

Explanation:

it contains 58.37 as there is no compound with 58.4 bromine formula brf3

The products that can be formed are hydrogen iodide and phosphoric acid.

They are substances formed from chemical reactions.

The equation of the illustrated reaction together with the products is as follows:

[tex]P + H_2O + I_2 --- > H_3PO_4 + HI[/tex]

The products formed are phosphoric acid ([tex]H_3PO_4[/tex]) and hydrogen iodide ([tex]HI[/tex].

Alternatively, the equation of the reaction can be written as:

[tex]18P + 5I_2 + 32H_2O -- > 10PH_4I + 8H_3PO_4[/tex]

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Bromine has larger ionic radius and atomic radius than fluorine.

Fluorine has larger ionisation energy and electronegativity than bromine.

Halogen are those elements that are found in group 7 of the periodic table.

Fluorine is in period two of the periodic table, meaning that it contains electrons in only the first two energy levels at ground state. It has a higher ionization energy and electronegativity than bromine.

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Indicate whether fluorine or bromine has a larger value for each of the following properties. a. electronegativity b. ionic radius c. atomic radius d. ionization energy

Answer:

2 molecules of oxygen are necessary

The change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.

The change in temperature of a substance can be calculated using the following formula:

Q = mc∆T

Where;

500 = 23 × 0.24 × ∆T

500 = 5.52∆T

∆T = 500 ÷ 5.52

∆T = 90.5°C

Therefore, the change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.

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Answer:

They have been found to cause cancer in humans meaning any release of carcinogens will increase, not decrease, CANCER RISK.

Explanation:

Certain chemicals, including benzene, beryllium, asbestos, vinyl chloride, and arsenic are known human carcinogens, meaning “they have been found to cause cancer in humans.” A persons risk of developing cancer depends on how much, how long, how often, and when they are exposed to these chemicals.

Answer:

1.45 x 10⁻² g CO₂

Explanation:

To find the mass of carbon dioxide, you need to (1) convert grams CH₄ to moles CH₄ (via molar mass), then (2) convert moles CH₄ to moles CO₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass). The final answer should have 3 sig figs to reflect the given value (5.30 x 10⁻³ g).

Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)

Molar Mass (CH₄): 16.043 g/mol

Combustion of Methane:

1 CH₄ + 2 O₂ ---> 2 H₂O + 1 CO₂

Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)

Molar Mass (CO₂): 44.007 g/mol

5.30 x 10⁻³ g CH₄          1 mole              1 mole CO₂          44.007 g
---------------------------  x  ----------------  x  ---------------------  x  -----------------  =
                                      16.043 g            1 mole CH₄            1 mole

=  0.0145 g CO₂

=  1.45 x 10⁻² g CO₂

Taking into account the change of units, 100 meters are 109.361 yards and 328.084 feets.

The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

That is, what is intended with it is to find the fourth term of a proportion knowing the other three.  

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.

To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: [tex]x=\frac{cxb}{a}[/tex]

The direct rule of three is the rule applied in this case where there is a change of units.

To perform in this case the conversion of units, you must first know that:

Then, you can apply the following rules of three:

1 meter ⇒ 1.09361 yards

100 meters ⇒ x

So: [tex]x=\frac{100 metersx1.09361 yards}{1 meter}[/tex]

Solving:

x= 109.361 yards

1 meter ⇒ 3.28084 feets

100 meters ⇒ x

So: [tex]x=\frac{100 metersx3.28084 feets}{1 meter}[/tex]

Solving:

x= 328.084 feets

In summary, 100 meters are 109.361 yards and 328.084 feets.

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Tools which are specifically used for earth science are Temperature Scales which are Celsius, Fahrenheit, and Kelvin.

So we can conclude that the temperature scales which is specifically Celsius, Fahrenheit, and Kelvin are specifically used for earth science.

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50.97 g AgNO₃ is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq)

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Molar mass of AgNO₃ = (107.9 + 14.0 + 16.0×3) g/mol = 169.9 g/mol

Molarity = Moles of solute ÷ Volume of solution in litre

0.600 mol/L = Moles of solute ÷ 0.5 mL

Moles of solute =0.3 mol

Moles =[tex]\frac{mass}{molar \;mass}[/tex]

0.3 mol =  [tex]\frac{mass}{169.9 g/mol}[/tex]

Mass =50.97 g AgNO₃

Hence, 50.97 g AgNO₃ is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq).

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Taking into account the definition of density, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

[tex]0.785 \frac{g}{cm^{3} }=\frac{32,200,000 g}{volume}[/tex]

Solving:

volume×0.785[tex]\frac{g}{cm^{3} }[/tex]= 32,200,000 g

volume=[tex]\frac{32,200,000 g}{0.785 \frac{g}{cm^{3} }}[/tex]

volume= 41,019,108.28 cm³=  41.01910828 m³≅ 41.02 m³ (being 1 m³ = 1000000 cm³)

In summary, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.

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The element X from the calculation is Cs.

We have in the question the percentage by mass of water as  45.34% thus we can write;

45.34% = 12(H20)/2(X) + Fe + 6(CN)

Hence;

45.34/100 = 12(18)/2X + 56 + 6(26)

0.45 = 216/2X + 56 + 156

0.45 = 216/2X + 212

0.45(2X + 212) = 216

0.9X + 95.4 = 216

X = 216 -  95.4/0.9

X = 134

The element X from the calculation is Cs.

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The nuclear fission reaction with the formation of the deuterium has the missing part as ⁴₂He.

Nuclear radiation is given as the reaction in which the emission is formed in the form of the nuclear particles that made the change in the nucleus of the atom.

The nuclear radiation that made the release of ₁¹H can be given to fuse the electron with the He and form:

²₁H + ³₂He →⁴₂He + ₁¹H

Thus, the missing part in the nuclear fission reaction is ⁴₂He.

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O Hemoglobin

Explanation:

Hemoglobin (Heme + Globin) The protein hemoglobin is a molecule which is responsible for carrying almost all of the oxygen in the blood.

Answer:

False

Explanation:

There are two types of covalent bonding: polar covalent boding and nonpolar covalent bonding. During polar covalent bonding, the electrons are not shared evenly. This is due to the electronegativity differences between the two atoms. During nonpolar covalent bonding, the electrons are shared evenly.