1 According to the law of conservation of mass, the total mass of the reacting substances is
A always more than the total mass of the products.
B always less than the total mass of the products.
C sometimes more and sometimes less than the total mass of the products.
D always equal to the total mass of the products.​

Answer:

Example problem

Explanation:

A 6.00 L sample at 25.0 °C and 2.00 atm contains 0.500 mol of gas. If we add 0.250 mol of gas at the same pressure and temperature, what is the final total volume of the gas?

Solution

The formula for Avogadro's law is:

V1/n1=V2/n2

V1=6.00 L

n1=0.500 mol

V2=?

;m

ml

n2=0.500 mol + 0.250 mol = 0.750 mol

V2=V1×n2/n1

V2=6.00 L×0.750mol

0.500

mol=9.00 L

The mass of nitrogen, N₂ that contains 1.81×10²³ molecules is 8.42 g

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of nitrogen, N₂

But

1 mole of nitrogen, N₂ = 28.02 g

Thus,

6.02×10²³ molecules = 28.02 g of nitrogen, N₂

With the above information, we can obtain the mass of nitrogen, N₂ that contains 1.81×10²³ molecules as follow:

6.02×10²³ molecules = 28.02 g of nitrogen, N₂

Therefore,

1.81×10²³ molecules = (1.81×10²³ × 28.02) / 6.02×10²³

1.81×10²³ molecules = 8.42 g of nitrogen, N₂

Thus, we can conclude that the mass of nitrogen, N₂ is 8.42 g

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If 6.92 mol of C₅H₁₂ reacts with excess O₂, number of moles of CO₂ will be produced by the following combustion reaction is 34.6 mol.

The balanced reaction is given as:

C₅H₁₂   +   8O₂   --->   5CO₂   +    6 H₂O

Moles of C₅H₁₂  = 6.92 mol

1 mole of C₅H₁₂  produces 5 moles of CO₂

therefore , 6.92 mol of C₅H₁₂ = 5 × 6.92 mol

                                                = 34.6 mol of CO₂

number of moles of CO₂  = 34.6 mol

Thus, If 6.92 mol of C₅H₁₂ reacts with excess O₂, number of moles of CO₂ will be produced by the following combustion reaction is 34.6 mol.

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To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. First image represent oxygen element and second picture represent fluorine element.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In first image the number of protons are 8 which is of oxygen element. In second image the number of protons are 9 which is of Fluorine element.

Therefore,  first image represent oxygen element and second picture represent fluorine element.

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The given reaction is a double displacement reaction where, Cl and NO₃ group displaces between and sodium and silver atoms. The complete reaction is written as follows:

[tex]\rm NaCl (aq) + AgNO_{3} (aq) \rightarrow AgCl (s) + NaNO_{3} (aq)[/tex].

There are various kinds of reactions classified based on the way of regrouping of atoms in the reactants.  In a double displacement reaction, two species from the reactant side are displaced of each other.

The reaction between sodium chloride and silver nitrate gives sodium nitrate in aqueous form and the precipitate of silver chloride. Here the groups nitrate and chlorine displaces between sodium and silver. Hence it is a double displacement reaction.

The net reaction represents the formation of the silver chloride precipitate.

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Answer:

depends on the type of insulin, but your normal low everyday kind strach is stronger then insulin is stronger than cellulose

The mass of the steel bar is 26.7 g.

the specific heat capacity expression is given as :

Q = m c ΔT

Q steel = Q water

where,

specific heat for water = 0.452 J/ g ° C

specific heat capacity for steel = 4.18 J/ g ° C

Q steel = -Q water

m c ΔT =  - m c ΔT

85 × 0.452 × (19.2) = m × 4.18 ×0.8

mass of steel = 26.7 g

Thus, A volume of 85.0 mL of H2O is initially at room temperature (22.00 ∘C ). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.20 ∘C , the mass of the steel bar is 26.7 g.

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The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the concentration of [H3O+] in the solution is [tex]10^{11.4}[/tex]. pH is a unitless quantity

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

Mathematically,

pH=-log[H⁺]=11.4

Solving this

[H⁺]=[tex]10^{11.4}[/tex]

Therefore, the concentration of [H3O+] in the solution is [tex]10^{11.4}[/tex].

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The isotopes of bromine from the options would be Z = 35,  A = 79.

Isotopes are atoms of the same element with the same atomic number but different neutron numbers.

The atomic number of an atom is the number of protons present in the nucleus of the atom. Since elements are arranged according to their atomic number on the periodic table, isotopes of the same element will occupy the same position on the periodic table.

Now, considering the isotope of bromine (Br). The atomic number is 35. The atomic number is denoted as Z on the periodic table. The normal bromine atom has a mass number of 80. With 35 as the number of protons, the number of neutrons can be calculated as:

80 - 35 = 45.

Considering an atom with Z = 35, A = 79, means the atomic number is 35, which means it is a bromine atom. The mass number is 79 instead of 80.

79 - 35 = 44.

This means that the atom has 44 as the neutron number instead of 45. Thus, Z = 35, A = 79 is the only isotope of bromine.

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Answer:

0.714 m (app.)

Explanation:

use ∧ = c/f

here, ∧ = wavelength

c = velocity of light = 3 × 10^8 m/s

f = frequency = 4.2 × 10^8 Hz

The volume of the 0.240M sulfuric acid required to completely react with sodium hydroxide will be

Firstly we will write the correct balanced equation for the reaction:

2NaOH + H₂SO₄ ==> Na₂SO₄ + 2H₂O

Next, determine moles of NaOH present:

75.5 g NaOH x 1 mole NaOH/151 g = 0.5 moles NaOH

Next, determine number of moles H₂SO₄ needed to react with 0.5 moles NaOH,

0.5 moles NaOH x 1 mole H₂SO₄ /2 moles NaOH = 0.25 moles H₂SO₄ needed

Finally, calculate the volume of H₂SO₄ needed to provide 0.25 moles H₂SO₄:

(0.240 mole/L)(x L) = 0.25 moles

Molarity= 0.25/ volume

volume = 0.25/ molarity

= 0.25/ 0.24

=1.04 L

= 1040 mL

So, the volume of the given solute required to completely react with sodium hydroxide will be 1040 mL.

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If there are any actual values of x for which f(x) = zero then the curve isn't always absolutely above or beneath the axis.

Check the values of y. All values positive -> curve is above y-axis. All values negative -> curve is beneath y-axis. There also are different cases. The curve might (for example) intersect the x-axis.

Adding to the output of a feature actions the graph up. Subtracting from the output of a feature actions the graph down. Here are the graphs of y = f (x), y = f (x) + 2, and y = f (x) - 2.

If the slope of f(x) is negative, then the graph of f'(x) might be beneath the x-axis. If the slope of f(x) is positive, then the graph of f'(x) might be above the x-axis. All relative extrema of f(x) turns into x-intercepts of f'(x).

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Answer: it erases the blue oxidized copper and returns it to its pristine original look

Explanation:

The more cooper there is the better the ammonia will work

The container volume and the temperature do not change, the pressure of the gas mixture after the complete decomposition of N₂O is 3 atm.

The reaction is given as :

2N₂O ---->  2N₂   +   O₂

volume = 2.95 L

temperature = 734 + 273 = 1007 K

mass = 5.10 g

moles = mass / molar mass

          = 5.10 / 44

          =  0.11 mol

using ideal gas equation here:

P V = n RT

P = (0.11 × 0.082 × 1007) / 2.95

P   = 3 atm

Thus, The container volume and the temperature do not change, the pressure of the gas mixture after the complete decomposition of N₂O is 3 atm.

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To research some substances pH 0 to less than 7 is acidic, 7 is neutral and more than 7 is neutral.

baking soda - base

Vinegar - acid

Distilled water - neutral

Pure rain - neutral

Ammonia -  nasic

Lemon juice -  acid

Hair and skin - acidic

An acid is a molecule or ion capable of both donating a proton, referred to as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. the first class of acids are the proton donors, or Brønsted–Lowry acids.

An acid is any substance that in water answer tastes sour, adjusts blue litmus paper to red, reacts with a few metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis). An acid is a substance that produces hydrogen (H+) ions when it's far delivered to water. A hydrogen ion is simply the proton and no electron

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The ppm concentration of the sodium chloride solution, given that 7.0×10⁻³ g is dissolved with a volume of 2 L is 60 ppm

To obatin the concentration in ppm, we'll begin by obtaining the mole of the sodium chloride in the solution. This can be obtained as follow:

Mole = mass / molar mass

Mole of sodium chloride = 7.0×10⁻³ / 58.5

Mole of sodium chloride = 0.00012 mole

Finally, we shall determine the concentration in ppm. This can be obtained as follow:

Concentration (in ppm) = (mole of solute / volume) × 10⁶

Concentration (in ppm) = (0.00012 / 2) × 10⁶

Concentration (in ppm) = 60 ppm

Thus, we can conclude that the ppm concentration is 60 ppm

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The whole number mole ratio of LiCIO₄ to H₂O in the sample of the compound is 1 : 3.

The mole ratio of the reaction is the ratio in which moles of reactants combine to form moles of product.

The mole ratio of the given reaction is calculated below as follows:

Moles of LiCIO₄ present in the sample of the compound = 0.0449 mole LiCIO₄

Moles of H₂O present in the sample of the compound = 0.135 mol H₂O

To get the whole number mole ratio, we divide each mole of substance present in the sample by the smallest number of moles.

Mole ratio of  LiCIO₄ = 0.0449 mole / 0.0449 mole

Mole ratio of  LiCIO₄ = 1

Mole ratio of  H₂O = 0.135 / 0.0449

Mole ratio of  H₂O = 3

Hence mole ratio of  LiCIO₄ to H₂O in the sample = 1 : 3

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The change in internal energy for the system is 5.656 kJ/ mole.

Internal energy is defined as the quality or state function that describes a substance's energy in the absence of capillary effects and the impacts of external magnetic, electric, and other fields. Geothermal heat from the earth's core and high-temperature mantle is the main source of internal energy for the planet.

Given,

Δq = 7.070 kJ

P∆V = 1.414 kJ

As we know that

Δq = ΔU + P∆V

So, ΔU = Δq - P∆V

ΔU = 7.070 kJ - 1.414 kJ

ΔU  = 5.656 kJ / mole

Thus, the change in internal energy for the system is 5.656 kJ/ mole.

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Considering the ideal gas law, the correct answer is the second option: 0.0594 moles of a gas are in a 4.2L container at 310K at 0.36atm

An ideal gas is called a hypothetical or theoretical gas, which would be composed of particles that move randomly and without interacting with each other.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

where:

In this case, you know:

Replacing in the ideal gas law:

0.36 atm× 4.2 L = n× 0.082 (atm×L)/(mol×K)× 310 K

Solving:

(0.36 atm× 4.2 L)÷ (0.082 (atm×L)/(mol×K)× 310 K)= n

0.0594 moles= n

Finally, the number of moles of gas is 0.0594 moles.

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Energy is needed to break bonds, is the best exemplifies the interaction of energy with chemical bonds.

What is chemical bond?
An enduring attraction between ions or atoms known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds. Covalent, ionic, and metallic bonds are examples of "strong bonds" or "primary bonds," whereas dipole-dipole interactions, the London dispersion force, and hydrogen bonding are examples of "weak bonds" or "secondary bonds." The sharing or exchange of electrons between the involved atoms results in strong chemical bonds. The negatively charged electrons that surround the nucleus as well as the positively charged protons that make up a nucleus are attracted to one another because opposite electric charges are attracted to one another.

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Answer:

jar 1 = barium chloride

jar 2 = potassium bromide

jar 3 = calcium iodide

Explanation:

Electronegativity (EN): A measure of an atom's ability to attract electrons (or electron density) toward itself. On the Pauling scale, fluorine is the most electronegative element (EN = 4.0) and cesium and francium are the least electronegative elements (EN = 0.7).

Answer:

(e) 148.2. However, it should be expressed only to 3 significant figures since 2.00 only has 3.

Trace evidence in the above case refers to the piece of the suspect’s hair that was found on the victim’s body.

Trace Evidence Analysis is the field  of forensic science that deals with the minute transfers of materials that cannot be seen with the human eye. The handling and analysis of trace evidence requires care and specialized techniques. Trace evidence may provide a link between the victim and a suspect, a victim and a scene, or the suspect and a scene.

Thus with the help of trace trace evidence we can identity the suspect.

It is not uncommon for people to shed hair throughout the day.  The ease of transfer of this type of evidence makes it very useful in criminal investigation.  Forensic testing of hairs involves identification of human versus animal hair and also the comparison of microscopic features to differentiate between hairs from different individuals.  Once comparison is completed, hair with follicular tags can be sent to the Nuclear DNA Unit for analysis.

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¿What is a sulphurous gas?

Sulfur dioxide (SO) is a colorless gas with a pungent odor particular. Also called sulfite, it was used from centuries ago and its purpose is to preserve the aromas of the wine and the elimination of bacteria. It is also used in preservatives and antioxidants, and the food industries

They use it in dried fruit juices, jams and juices.

Answer:

Boron trifluoride |

Explanation:

Boron trifluoride is a colorless gas

The RMS speed of Cl₂ and He molecules at 411 K is 379.97m/s and 1600 m/s

In a gas, the root-mean-square speed is used to calculate particle speed, which is defined as the square root of the common velocity squared of the molecules in the gas. It is represented mathematically as vrms=3RT/M.

The average kinetic energy of gas molecules is proportional to temperature and inversely proportional to molecular weight.

The root mean square(RMS) speed of the molecule in a gas can be calculated using the following formula

Rms speed = √(3RT/M)

Here R is the gas constant, T is the absolute temperature and M is the molar mass of the gas molecule in kg/mol

Now we have to calculate the RMS speed of Cl₂ molecules at 411 K? and the RMS speed of He atoms at 411 K.

At 411 K, the RMS speed of Cl2 molecules is

RMS speed = √(3RT/M)

=√((3 x 8.314 x 411)/(71 x 10-3 ))

=√(10251.162/0.071)

= √144382.563

= 379.97m/s

RMS speed of He molecules at 411 K

RMS speed = √(3RT/M)

=√((3 x 8.314 x 411)/(4 x 10-3 ))

=√(10251.162/0.004)

= √2562790.5

= 1600 m/s

Therefore the RMS speed of Cl₂ and He molecules at 411 K is 379.97m/s and 1600 m/s

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If a single grain of rice weighs 0.000064 lb and assuming 1 grain of rice is counted per second, the number of days to count 10 lb of rice would be 1.8084 days.

According to the analysis:

1 grain = 0.000064 lb

This means that 0.000064 lb is counted per second according to the rate given.

There is a total of 10 lb of rice, how many 0.000064 lb can be deducted from 10 lb?

10/0.000064  = 156250

In other words, there are 156250 grains of rice in total.

1 grain = 1 sec

How many seconds will it take to count 156250 grains?

156250 x 1 = 156250 seconds

60 seconds = 1 minute

60 minutes = 1 hour

124 hours = 1 day

Total number of seconds in a day (24 hours) = 60 x 60 x 24

                                                                           = 86400 seconds

So, how many 86400 seconds can be deducted from 156250 seconds?

156250/86400 = 1.8084

Thus, it will take a total of 1.8084 days to count 10 lb of rice grains.

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Here's some examples

CH, OH, FH, etc