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What is the chemical symbol of the halogen located in the second period that naturally occurs as a diatomic gas?
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X, X Ω·
viia I
of light?

A scientific theory is backed up by pieces of evidence hence it is not a mere guess.

A scientific theory is a well crafted explanation of an observed phenomenon. A scientific theory is different from a mere guess in the sense that the scientific theory must have some basis that support it.

A mere guess does not have any kind of data that supports it. Let us take the theory of evolution as an example. Countless discoveries of fossil evidences have shed some light on the probability of the theory. In this case, we can not consider it a mere guess since there is some kind of evidence that supports the claims of the theory.

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hi

1 mile is  1 609 meters.  (rounded).

As there is 100 centimeters in a meter, then

1 mile is  160 900 centimeter.  

Then 1.5 miles , is 1 mile + one half so :

160 900 + 160 900 /2 =  160 900 + 80 450

                                     =  241 350

1.5 mile is  241 350  centimeters.  

please note that the value of a mile was rounded.

Masses of water and carbon dioxide be 54 g and  66 g respectively.

Mass is a measure of the amount of matter that an object contains

Here given data is 1.00 x10⁵ grams of oxygen and  1.00 x10⁵ grams of methane and the reaction is

CH₄ +2O₂ → CO₂ + 2H₂O

Then (12+4)= CH₄ , 2×(16×2)=2O₂  , 12+(16×2)=CO₂  , 2×(16+2)=2H₂O

CH₄ = 16 g, 2O₂ = 64 g, CO₂ = 44 g, 2H₂O = 36 g

Then, we have to find masses of water and carbon dioxide = ?

24g of CH₄=24/16×44 = 66 g of CO₂

16 g of CH₄ will produce 36 g of water

Then, 24 g of CH₄ = 24/16×36 = 54 g of water

Mass of water is  54 g and mass of carbon dioxide is 66 g

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Answer:

physical

Explanation:

theres nothing really going on w the paper clip ur just bending it

Answer:

07 Question (2 points) See page 160 The concentration of phosphate ions in water samples can be determined by spectrophotometry. Samples are treated with tin(II) chloride and ammonium molybdate to react with the phosphate to make a blue complex. Before testing an unknown sample, a series of solutions with known concentrations is tested to create a calibration plot. Calibration data with concentration units of part per million (ppm) are shown in the graph below. Calibration Data for Phosphate Analysis D Absorbance 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 04 Rat B 0.0434 -0.0264 R = 0.9945 A A water sample of unknown phosphate concentration is found to have an absorbance of 0.460 after treatment with tin(II) chloride and ammonium molybdate. What is the concentration of phosphate ion in the sample? ppm

The mass of the silver that will raise the water by 1.5 mL is 15.75 g

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can obtain the mass of the silver. Details below

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of silver = 10.5 × 1.5

Mass of silver = 15.75 g

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The two things shown by a chemical formula are: it tells the number of atoms of each element in a compound and symbols of the atoms of the elements present in the compound.

A chemical formula is used by scientists to represent the information concerning the elements and the types of elements found in a chemical compound.

A chemical compound is a substance that is made up of two or more elements which are chemically combined together.

There are various type of chemical formula which include the following:

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The mass of ammonia gas produced by the given volume of hydrogen and nitrogen is 5.066 g.

The mass of ammonia in grams would be produced at temperature 288 K and a pressure of 0.87 bar is determined using the ideal gas equation.

The ideal gas equation is as follows;

PV = nRT

where;

P is pressure

V is volume

n is number of moles

R is molar gas constant = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹

T is temperature in kelvin.

number = mass/molar mass

Considering the data provided, the moles of each gas present in their containers are as follows;

n = PV/RT

moles of nitrogen gas:

P = 0.87 bar,  V = 11.67, R = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹, T = 288 K

n = 0.87 * 11.67/8.314 × 10⁻² * 288

n = 0.424 moles

moles of hydrogen gas:

P = 0.87 bar,  V = 12.3, R = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹, T = 288 K

n = 0.87 * 12.3/8.314 × 10⁻² * 288

n = 0.447 moles

The equation of the reaction is given below:

N₂ (g) + 3 H₂(g) → 2 NH₃ (g)

From the equation, mole ratio of nitrogen to hydrogen is 1 : 3, therefore, hydrogen is the limiting reactant.

Moles of ammonia gas produced = 0.447 * 2/3 moles

Moles of ammonia gas produced = 0.298 moles

molar mass of ammonia gas = 17.0 g/mol

Mass of ammonia gas produced = 0.298 moles * 17.0 g/mol

Mass of ammonia gas produced = 5.066 g

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The reactants are CH4 and O2 and the products are CO2 and H2O. The coefficients for both CH4 and CO2 are 1, meaning that for each mole of CH4 consumed, 1 mole of CO2 is produced.

Solution:

X₂ (03 (s) + 24U (ag) → 2x4(aq) + [tex]H_{2}ol[/tex] + [tex]o_{2}(g)[/tex]

Moles of [tex]o_{2}[/tex] = Mass of CO₂ produced 0.5938/Molar mass of co₂

= 0.593g/44.01gmol·

= [tex]n_{co2}[/tex] = 1.35*[tex]10^{-2} mol[/tex].

You can search for unclaimed property online through the Unclaimed Property Department database. Find out if the property matches your information. Once you've found a property you own, select the listing and click Start Claim. If you have lost a large amount of money, we recommend calling the police.

Do a thorough search first, but if you still can't find the money, call the police. Check your eligibility by visiting the FSCA website, which has a built-in search engine. Visit Liberty's website and add your or your relatives' details for quick and easy verification.

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The climate of a region is influenced by large bodies of water like oceans, seas, and major lakes. As a result, coastal regions will have different summer and winter temperatures.

The weather in Tahoe is dry and moderate. There is relatively little humidity even in the summer, and snowstorms in the winter are when most precipitation occurs. The lake lies 1,890 meters above sea level at an elevation of 6,200 feet, although the nearby mountain peaks are between 9,000 and 10,000 feet higher (2,743 to 3,048 meters.)

In Nevada, Lake Tahoe is used as a reservoir for municipal and irrigation water storage. About 75% of the water supply for the quickly expanding Reno-Sparks region comes from Lake Tahoe and a few smaller publicly and privately owned reservoirs in the Truckee River system.

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Answer: 9.946*10^-2 M

Explanation: if u multply

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number.  To go from molecules to moles, divide the number of molecules by 6.02 x 10²³.

Avogadro's number, which is equal to 6.022 × 10²³, is the number of units in one mole of any material (defined as its molecular weight in grams). Depending on the substance and the nature of the reaction, the units could be electrons, atoms, ions, or molecules.

Thus,

No. of molecules = No. of moles × Avogadro no.

from the question we know,

No. of molecules = 2.44 × 10 ²⁴

Avogadro no. = 6.02 × 10²³

i.e. 2.44 × 10²⁴ = No. of moles  × 6.02 × 10²³

No. of moles = 2.44 × 10 ²⁴

                         6.02 × 10²³

No. of moles = 4.05

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

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The forward reaction in the tetra-chloro cobalt(II) ion and hexa-aquo cobalt ion equilibrium is a exothermic process.

The reaction is exothermic in the forward reaction because Co(H₂O)₆[tex]^+2[/tex]  is more stable than CoCl₄[tex]^2-[/tex] as the bond are stronger in aquo complex of cobalt than in chlorate complex.

It is expected that if temperature is increased, reaction will occur in reverse direction to favoring endothermic reaction ,and if temperature is decreased exothermic reaction is favored.

In exothermic reaction,the color of complex is pink due to an increase in the number of water molecules while in endothermic reaction there is an increase in the concentration of chloride ions which leads to blue color solution.

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[tex] \huge \mathbb{\pink{\fbox{\blue{\underline{\green{ANSWER}}}}}} \\ \\ \tt (a) \: 1.37 \times 10 {}^{ 0} [/tex]

Answer:

radioactive decay or solar radiation

Explanation:

Answer:

the areas which are flat in the heating curve is when matter is condensing

A substance containing only one type of atom is called a chemical element. This differs slightly from an element, which is a category of atoms based on their number of protons. A chemical element is a substance that exists in the real world and is formed from only one type of atom.

This substance can be a set of atoms present on their very own or the atoms can be bonded together to shape molecules of the simplest type of atom, together with oxygen. while a substance incorporates only one form of an atom, it is known as a detail. each detail has a unique name and specific houses which are one of a kind from all of the relaxation of the elements.

An atom is a particle of count that uniquely defines a chemical detail. An atom consists of a principal nucleus which is surrounded by using one or extra negatively charged electrons. The nucleus is definitely charged and consists of one or more fairly heavy particles known as protons and neutrons. isotopes are members of a family of detail that all have the same wide variety of protons but unique numbers of neutrons.

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Craters are produced when asteroids, meteoroids, or comets hit the moon's surface.

This refers to a type of depression which is formed on the surface of the planet, moon etc which are present in the solar system due to hyper velocity impact of a smaller body such as asteroids, meteoroids etc.

Craters can also be formed as a result of the explosion which results from the impact of the smaller bodies mentioned above. The moon has a lot of craters which was formed billions of years ago and is therefore the most appropriate choice in this scenario.

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The velocity vs. time graph that corresponds to the info shown by the position vs. time graph is that the graph that has continuous acceleration (straight line).

The above statement of continuous acceleration means a relentless acceleration. A straight lines is just known to be a continuing acceleration that's said to be unchanging. Note that when there's a curved lines in a very graph, it implies that there's a non-constant acceleration. Therefore an object that's undergoing constant acceleration is one that may be seen in an exceedingly line. So therefore, the speed vs. time graph is one that matches with the information represented by the continual acceleration (straight line) on the graph.

Constant acceleration means that velocity changes at a constant rate with respect to time. If acceleration is made zero, velocity does not change. If acceleration is positive, the magnitude of velocity increases correspondingly.

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Answer:

your answer is c your welcome

Explanation:

The correct answer is 3.68 × 10^23 atoms.

The Avogadro's number is the number of constituent particles—typically molecules, atoms, or ions—that make up a mole of a substance. The relationship between the molar mass of a substance and the mass of a sample is determined by its proportionality. In the International System of Units, it has the symbol NA or L and a value of 6.022140857 × 10^23 mol^-1 (SI).

Weight of C6H6 = 8 gram

C6H6 Molar mass is = 78 gram/mole

Mole of C6H6 = 8 / 78 mole

= 0.102 mole C6H6

Mole of C6H6 = No. of C6H6 molecule / Avagadro number

0.102 × 6.03 × 10^23 = No of  C6H6 molecule

Here 6 atoms in  C6H6 molecule so

No. of H atoms in  C6H6 = 0.102 × 6.03 × 10^23

= 3.68 × 10^23 atoms

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Heavy metals such lead and arsenic does cause damage to human DNA.

Industries which release heavy metals into land and water ecosystems should be penalized.

However, the exposure of these heavy metals damage the body due to the by inhibiting proteins in DNA pathways during repairs.

The side or adverse effects of exposure of heavy metals have great risk to the well being of humans. Among these effects are as follows:

So therefore, heavy metals such lead and arsenic does cause damage to human DNA.

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Answer:

The kinetic energy is,

Explanation :

The formula for kinetic energy is:

where,

R = gas constant = 8.314 J/mol.K

T = temperature =

Now put all the given values in the above kinetic energy formula, we get:

Therefore, the kinetic energy is,

Explanation:

The kind of chemical reaction that results in the formation of sodium chloride is a neutralization reaction.

Bases react to produce water and salt, which requires the interaction of H+ and OH- ions. A pH of 7 results from the neutralization of a potent acid and a potent base. A strong base neutralizing a weak acid will provide a pH result that is more than 7, while the neutralization of a strong acid and weak base will produce a pH result that is less than 7.

A solution is neutralized when equal amounts of acid and base combine to create salts. One mole of protons (H+) is equivalent to one mole of the base, and one mole of acid is equivalent to one mole of protons (H+) (OH-). N parts of acid will always neutralize N parts of the base because salts are created by neutralization reactions with comparable weight concentrations of acids and bases.

Therefore, the kind of chemical reaction that results in the formation of sodium chloride is a neutralization reaction.

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Answer:

yes

Explanation:

it is a mixture of gases.

there are some other main gases like,

nitrogen with approximately 78%

and oxygen with 21%

and many other gases.

Answer:

Explanation:

55647 for b

The amount of volume in millilitres a 6.1 M HCI solution needed to obtain 0.150 mol HCI is 24.6mL.

The volume of a solution can be calculated by dividing the number of moles by the molarity of the solution as follows:

Volume = no of moles ÷ molarity

The molarity of a solution is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

According to this question, 6.1 M HCI solutions are needed to obtain 0.150 mol HCI, the volume required can be calculated as follows:

Volume = 0.150moles ÷ 6.1 M

Volume = 0.0246 L

To convert this volume to millilitres, we multiply by 1000 to derive 24.6mL.

Therefore, the amount of volume in millilitres a 6.1 M HCI solution needed to obtain 0.150 mol HCI is 24.6mL.

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[tex]\implies[/tex] The correct answer is (B) 0.00037

[tex]\bf{ \underline{Step \: 1)} :3.7 × 10^{-4 }we \: can \: write \: as \:37 × 10^{-5}}[/tex]

[tex]\bf{ \underline{Step \: 2)} :37 × 10^{-5 } \: we \: can \: write \: as \: 37 × \frac{1}{10^5}}[/tex]

[tex]\bf{ \underline{Step \: 3)} :37 × \frac{1}{10^5}\: we \: can \: write \: as \: (37 × \frac{1}{(10)(10)(10)(10)(10)}})[/tex]

[tex]\bf{ \underline{Step \: 4)} :37 × \frac{1}{(10)(10)(10)(10)(10)} we \: can \: write \: as \: ( 37 × \frac{1}{100000}})[/tex]

[tex]\bf{ \underline{Step \: 5)} :37 × \frac{1}{100000} \: we \: can \: write \: as \: \frac{37}{100000}}[/tex]

[tex]\bf{ \underline{Step \: 6)} :\frac{37}{100000} \: we \: can \: write \: as \: 0.000037}[/tex]

The pressure within Earth's atmosphere is referred to as atmospheric pressure or barometric pressure. The definition of the standard atmosphere is 101,325 Pa, or the same as 1013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.

If the air pressure at sea level is 1,014 mbar, what would you expect would happen to the air pressure in a hole that is dug 1,000 feet below ground?

"451.5415 psi"

14.7 psi + 1000*(0.445 psi) = 451.5415 psi

As we descend in the atmosphere, there is a greater mass of atmosphere above us, hence it is predicted that the pressure will rise.

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Answer:

i think paint

Explanation:

The density of the solid block is 3.79 * 10⁻³ g/cm³.

The density of a substance is defined as the ratio of mass and volume of a substance.

Density measure how close together the particles of a given mass of a substance is. Substances with high density have greater masses compared to the volume of those substances whereas substances with low densities have greater volume compared to their masses.

The volume of the solid block = 78 * 55 * 35 = 150150 cm³

mass of solid block = 569 g

Density of the solid block = 569 g/150150 cm³

Density of the solid block = 3.79 * 10⁻³ g/cm³

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