Please help me I need help with this question

Answer:

2Fe + Cl₂ → 2FeCl

Explanation:

Answer:

2Fe + Cl(sub2) ---> 2FeCl

Explanation:

Before balancing, there is 1 Fe and 2 Cl on the left side of the equation. In order to get 2 Cl on the right side, we have to multiply (FeCl) by 2. This causes there to be 2 Fe on the right side also, so now you go back and multiply 2 by the Fe on the left. Leaving you with 2 Fe and 2 Cl on the left, and 2 Fe and 2 Cl on the right.

Answer:

B

Explanation:

I took the test

Answer:

the breaking of rock into smaller pieces from nonchemical processes

Explanation:

Basically, the process that breaks rocks apart without changing their chemical composition.

Answer:

im pretty sure its B

Explanation:

Answer:

D.

Explanation:

Answer:

Hydrogen Electronegativity Level: 2.20 is the correct answer

The amount of the salts left undissolved at 40 °C is Lead II nitrate = 300 g and Potassium chloride = 100 g and Potassium dichromate = 0 g.

We are aware that the mass of a solute that may dissolve at a specific temperature is related to the solubility. The absorption is temperature dependant, it must be said.

Let's consider how much of each salt would absorb at 40 °C;

Pb(NO3)₂ : 0.0g

KCl : 100.0g

K₂Cr₂O₇ : 300.0g

For any salt, we may calculate the amount that can be dissolved at 40 °C by dissolving 500 g and subtracting its solubility at that temperature.

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The complete question is-

For each salt, determine how much will remain undissolved if 500 g is mixed into a liter of pure water at 40 °C. One significant figure is sufficient in each answer.

Pb(NO3)₂:

KCI:

K₂Cr₂O7:

Yes, because green eye alleles are more common than blue eye alleles; therefore, a parent with blue eyes can only have two blue eye alleles.

The term "allele" is used to refer to a gene's alternate form or variants. For each autosomal gene, one allele is inherited from each parent, and we often group the alleles into categories. Usually, we refer to them as normal, wild-type, aberrant, or mutant alleles.

A gene's changeable form is called an allele. There are some genes that come in different forms yet all have the same genomic location on a chromosome. Humans are considered diploid organisms because each genetic locus in them has two alleles, one from each parent..

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Given that we have a mass percentage. Since it is convenient to start with 100g of the chemical, there are 60g of sulfur and 40g of oxygen in a 100g sample of the above compound.

The reactants consist of four hydrogen atoms, four oxygen atoms, and one carbon atom. The end products contain four hydrogen atoms, four oxygen atoms, and one carbon atom. This calculation is correct. The two elements carbon and hydrogen make up the simplest organic molecules. These substances are known as hydrocarbons. A gas mixture with two parts oxygen and four parts hydrogen was the most explosive. There was nothing left over after burning this gas mixture. It was the most explosive response because it was the most effective.

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Answer:

D

Explanation:

I'm not 100% sure on this but I am pretty confident that it's D or C I'm 98% sure it's D

Explanation:

Carbon-14 has a half life of 5730 years, meaning that 5730 years after an organism dies, half of its carbon-14 atoms have decayed to nitrogen atoms. Similarly, 11460 years after an organism dies, only one quarter of its original carbon-14 atoms are still around.

Single- replacement reaction is described by the chemical equation Mg(s)+Cu(NO₃)₂(l)→Mg(NO₃)₂(s)+Cu(s) as more reactive magnesium displaces copper from it's salt as it is less reactive.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Pressure of the gas inside the container is 662.59 torr.

The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume).

The general law of ideal gas can be applied here: PV is equal to nRT, where P is the gas pressure in atm.

V is the number of moles of the gas in a mole, and n is the volume of the gas in L. R is the universal gas constant. T is the temperature(Kelvin) of the gas.

If P and T are different values and n and V are constants, then

(P₁T₂) = (P₂T₁).

P₁ = 735 torr, T₁ = 29°C + 273 = 302 K,

P₂ = ??? torr, ​T₂ = 62°C + 273 = 335 K.

∴ P₂ = (P₁T₂)/(P₁) = (735 torr)(302 K)/(335 K) = 662.59 torr.

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Answer:

Cells

Explanation:

Everything in living things is made from cells. Cells come together to make tissues, which make organs, which make organ system.

Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... The empirical formula is CH[tex]_2[/tex]O.

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

Number of gram atoms in compound and divide by smallest Number of gram atoms in compound

C=(38.7%)÷12=3.2

H=(9.6%)÷1=9.6

O=( 51.6%)÷16=3.2

The atomic ratio is 3.2:9.6:3.2

Whole number C:H:O is1:2:1

Empirical formula corresponding to this whole number is CH[tex]_2[/tex]O.

Thus the empirical formula is CH[tex]_2[/tex]O.

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The IUPAC names of the given organic compounds are as follows:

The IUPAC names of the given organic compounds are derived from three parts to their name:

The given compounds have a principal functional group of -OH which is the alkanol functional group.

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How to identify covalent and ionic compounds?

11 dinitrogen trioxide - N2O3 - covalent , both oxygen and nitrogen are nonmetals.

13 barium phosphate - Ba₃ (PO4)₂ - ionic , bond is created by giving or taking electrons.

14 lithium acetate - Li⁺ CH3COO⁻ - ionic

15 phosphorus trifluoride - PF₃ - covalent, formed by the sharing of electrons between phosphorus and fluorine atoms.

16 vanadium (V) oxide - V2O5 - ionic

17 aluminum hydroxide - Al(OH)3 - covalent, according to fajan rule

18 zinc sulfide - ZnS - ionic , its composed of Zn²⁺ and S²⁻ ions

19 silicon tetrafluoride - SiF4 - covalent, their bonds are arranged in tetrahedral shape

20 nickel(11) phosphate - Ni₃(PO4)₂ - ionic, as nickel is metal and phosphate is polyatomic ion

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The specificity of the transcriptional repressor for its target site over non-target sites in the absence of its ligand is very low. The specificity in the presence of the ligand is very high.

Transcriptional repressor is defined as a sequence-specific DNA binding proteins work by enticing corepressor complexes, which are made up of a variety of proteins, including histone modifying enzymes.  It binds the DNA and repel RNA polymerase.

In the absence of its ligand, the specificity of the transcriptional repressor for its target site over non-target sites is relatively low. In the presence of the ligand, the specificity is quite high because ligand is used as a binding agent and if binding agent is not present the molecule does not bind easily.

Thus, the specificity of the transcriptional repressor for its target site over non-target sites in the absence of its ligand is very low. The specificity in the presence of the ligand is very high.

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The molar mass of a compound of 0.0401 moles weighing 21.6 grams is 538.65 g.

The molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole.

∴M = m / n

M = molar mass

m = mass of a substance (in grams) = 21.6 grams

n = number of moles of a substance = 0.0401 moles

∴ 0.0401 moles of a compound have a mass of 21.6 g

∴  1 mole of the compound will have a mass of  21.6 / 0.0401

                                                         = 538.65 g (molar mass of compound)

So,  the molar mass of a compound of 0.0401 moles weighing 21.6 grams

is 538.65 g.

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1. The solution of the problem is volume =  9.14 mL.

Use this formula, P1V1/T1 = P2V2/T2

Here,

P1 = initial pressure, given = 746 mm Hg

V1 = initial volume, given = 10.1 mL

T1 = initial temperature, given = 23° C = 296 K

P2 = final pressure, given = 760 mm Hg

V2 = final volume

T2 = final temperature, given = 0° C = 273 K

Put these values in formula, P1V1/T1 = P2V2/T2

V2 = P1V1T2/P2T1

V2 = 9.14 mL

Hence,

2. The solution of the problem, put the values in formula,

P1V1/T1 = P2V2/T2

V2 = P1V1T2/P2T1

3.The solution of the problem, put the values in formula,

P1V1/T1 = P2V2/T2

V2 = P1V1T2/P2T1

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The value of q (kJ) in the exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure is 14.40kJ.

What is an exothermic reaction?

Exothermic reaction is the reaction in which the standard enthalpy change of the reaction is negative that is there is release of heat energy.

The q (kJ) in the exothermic reaction can be calculated as,

2 H2O2(l) ------> 2 H2O(l) + O2(g)         ΔH = -196 kJ

So, 196kJ of heat (q) will be released for every 2 moles of hydrogen peroxide. To calculate the heat released for 5.00 g of hydrogen peroxide,

Number of moles of hydrogen peroxide = 5.00g / 34.016 g/mol

n = 0.147

q = -196 x 0.147 / 2 = 14.40kJ.

Therefore, 14.40kJ of heat is released by 5.00 g of hydroxide peroxide when it decomposes in the exothermic reaction.

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Answer:

The uranium fluoresces under UV light

Explanation:

The uranium fluoresces under UV light because the UV excites the electrons above the ground state and gives off photons as the electrons transition back to the ground state,” Naomi Marks, a research scientist at the Lawrence Livermore National Laboratory in California, tells Collectors Weekly.

Answer:

Uranium oxide.

Explanation:

Uranium glass does indeed glow under a blacklight. This is because of the uranium oxide that is used to produce the glass. When exposed to ultraviolet light, the uranium oxide will emit a greenish-yellow light.

If 9.8 g of sulfuric acid is dissolved in an excess quantity of water, it will yield 0.2-mole moles of hydrogen ions ( H+) and 0.1 moles mole of sulfate ions (SO4 -2).

Sulfuric acid or sulphuric acid, known in antiquity as oil of vitriol, is a mineral acid composed of the factors sulfur, oxygen, and hydrogen, with the molecular system H₂SO₄. it's miles a drab, odorless and viscous liquid that is miscible with water.

Calculation:-

The molar mass of sulphuric acid = 98

mass = 9.8 gram

moles = mass/ molar mass

           = 9.8/98

            = 0.1 moles

moles of H+ = 2 × 0.2 = 0.2 mole

moles of sulfate ions (SO4 -2). = 0.1 moles.

Sulfuric acid is used in many industries. it's used to supply other chemical compounds, explosives, and glue; to refine petroleum; to remedy metal, and in lead-primarily based vehicle batteries.

Sulfuric acid reacts violently with alcohol and water to launch warmth. It reacts with most metals, mainly while diluted with water, to shape flammable hydrogen gasoline, which may additionally create an explosion danger.

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The final temperature (in °C) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 °C is 28 °C.

The reaction is given as :

HCl  +  NaOH  ----->    H₂O   +   NaCl

moles of HCl = 5.42 × 0.025

                      = 0.135 mol

moles of NaOH = 4.32 × 0.025

                          = 0.108 mol

moles of reaction = 0.108 mol

specific heat capacity is given as:

Q = mc ΔT

Q = 0.108 × (- 55.8) = - 6.026 kJ = 602.6 J

total volume = 25 ml + 25 ml = 50 ml

mass = density × volume

         = 1.04 × 50 = 52 g

now, Q = mc ΔT

          602.6  = 52 × 3.93 × ( T - 25)

The final temperature T = 28 °C

Thus, The final temperature (in °C) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 °C is 28 °C.

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The energy that is released by 1Kg of octane is 47872 kJ while the heat that is enthalpy of formation of the mercury oxide is -181.6 kJ mol–1.

We know that the enthalpy of combustion has to do with the heat that is evolved when we burn one mole of a substances in oxygen. We need to first obtain the number of moles of the octane as follows;

Number of moles = mass/molar mass = 1 * 10^3 g/114 g/mol = 8.8 moles

If 1 mole of octane produces 5440 kJ of heat

8.8 moles of octane would produce 8.8 moles *  5440 kJ/1 mole

= 47872 kJ

b) Given that the heat that the energy that is required to decompose the compound is 181.6 kJ mol–1 then the enthalpy that is required to form the compound is -181.6 kJ mol–1.

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In a covalent bond, one line represents one pair of electrons being shared.

Covalent compounds are compounds formed as a result of sharing of electrons between the atoms that make up the compound.

In other words, electrons are shared among atoms that make up covalent compounds unlike in ionic compounds where some atoms donate electrons while some atoms accept electrons.

Thus, a line in the structure of covalent compounds represents a bond formed as a result of sharing a pair of electrons between two atoms.

For example, the line between C and H in C-H represents a bond formed between the two atoms as a result of sharing a pair of electrons between them.  Whereas, the line between Na and Cl atoms in Na-Cl represents a bond formed as a result of Na donating an electron to Cl.

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Sunscreen look like if it absorbed all of the visible light that hits it look like skin bright

A substances that help protect the skin from the sun harmful rays and sunscreen reflect and absorbed and scatter both ultraviolet radiation and provide protection against both type of radiation and sunscreen contain ingredient that help absorbed UV light and they sit on the surfaces of the skin and reflect away from the skin and sunscreen ingredient form a thin protective film that penetrate from the skin

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Hypochlorous acid is a weak acid. Its equation is following:-

HClO ⇄ H⁺ + ClO⁻

K = [H⁺]  [ClO⁻] / [HClO]

Weak Acids are the acids that do not completely dissociate into their constituent ions when dissolved in solutions.

When dissolved in water, an equilibrium is established between the concentration of the weak acid and its constituent ions.

The awareness of a substance is the quantity of solute present in a given amount of answer. Concentrations are typically expressed in phrases of molarity, defined as the wide variety of moles of solute in 1 L of answer.

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Answer:

A. 40.0%

Explanation: Divide 8/20=0.4 Move the decimal twice to the right BAM! you got 40%.