Answers
Alkali metals are more reactive metal . Potassium is more reactive than other elements, so option D is correct.
What are alkali metals ?The alkali metals in group 1 are so-called because when their oxides and hydroxides are treated with water, the resulting solutions are alkaline. As a result of the creation of the hyroxide ion, the solution becomes basic or alkaline.
Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Ru), Cesium (Cs), and Francium are alkali elements.
Potassium is more electropositive element and its enthalpy is increases, so potassium is more reactive than other elements.
Thus, option D is correct.
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Related Questions
*30 Points* What is the electronegativity difference of the compound HNO?
Hydrogen Electronegativity Level: 2.20
Nitrogen Electronegativity Level: 3.04
Oxygen Electronegativity Level: 3.44
Answers
Answer:
Hydrogen Electronegativity Level: 2.20 is the correct answer
What is the medium of the wave being detected by the seismograph
A. paper
B. Air
C. ink
D. rock
Answers
Answer:
D.
Explanation:
A transcriptional repressor, which is at a concentration in the bacterial cell of 10 nM, binds to
its target DNA sequence with a KD of 0.1 nM in the absence of its ligand, and with a KD of 1 μM in
the presence of its ligand. It also binds to non-target DNA sequences with a KD of 10 μM
regardless of the presence or absence of its ligand. The transcriptional repressor’s target DNA
sequence occurs once in the genome and there are 20,000 non-target DNA sites in the genome.
What is the specificity of the transcriptional repressor for its target site over non-target sites in
the absence of its ligand?
What is the specificity of the transcriptional repressor for its target site over non-target sites in
the presence of its ligand?
Answers
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.
What is transcriptional repressor?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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1.) A Compound has 38.7% carbon 9.6% hydrogen 51.6% oxygen
What is its empirical formula ?
The molar mass of the compound is 62g/mol what is its molecular formula?
2.) a compound has 94.1% oxygen and 5.9% hydrogen
what is its empirical formula ?
its molar mass is 34 g/mol
Answers
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.
What is Empirical formula?
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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What is the molar mass of a compound if 0.0401 moles weigh 21.6 grams ?
Answers
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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How does the weight of an object affect the amount of force it would need to move
Answers
Consider the reaction below.
HCl (aq) + NaOH (aq) --> H2O (l) + NaCl (aq) Δ = -55.8 kJ
Calculate the final temperature (in oC) 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 oC.
Ignore the heat absorbed by the calorimeter, and assume the solution has the same specific heat capacity and density as pure water.
Answers
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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list three ways in which the properties of metallic solids and ionic solids are different.
Answers
1-ionic solids essentially contain cations and anions.
2-whereas metallic solids contain metal atoms.
3-free electrons.
Is it possible to get a homozygous dominant offspring with brown eyes if you
cross and Heterozygous Dad with brown eyes, and a Homozygous recessive
with blue eyed Mom?
Use the empty Punnett square to determine if this is possible. Explain your
answer and copy and paste your completed Punnett square into the
discussion along with your answer.
Answers
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.
What is a brief definition of 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.
An allele or a gene?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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What would the sunscreen look like if it absorbed all of the visible light that hits it
Answers
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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Which of the following has the lowest entropy?
A. H₂O(g)
B. H₂O(s)
C. O₂(g)
D. H₂O(/)
Answers
Answer:
im pretty sure its B
Explanation:
Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction:
2 H2O2(l) → 2 H2O(l) + O2(g) ΔH = -196 kJ
Calculate the value of q (kJ) in this exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure.
Answers
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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Which equation describes a single-replacement reaction?
Responses
H2 (g) + Br2 (g)→2HBr (g)
Mg(s)+Cu(NO3)2(l)→Mg(NO3)2(s)+Cu(s)
2N2O5 (g)→O2 (g) + 4NO2 (g)
2Na(s) +Cl2(g) → 2NaCl(s)
Answers
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.
What is chemical equation?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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Part A
A sample of ideal gas is in a sealed container. The pressure of the gas is 735 torr, and
the temperature is 29 °C. If the temperature changes to 62 °C with no change in
volume or amount of gas, what is the new pressure, P2, of the gas inside the container?
Express your answer with the appropriate units.
View Available Hint(s)
HÅ
P₂ = Value
Submit
O
Units
?
Answers
Pressure of the gas inside the container is 662.59 torr.
What is ideal gas law?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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A compound that contains only carbon, hydrogen, and oxygen is 68. 5% c and 8. 63% h by mass. What is the empirical formula of this substance?.
Answers
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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Hypochlorous acid is a weak acid. Write an equation showing how HCIO acts in solution; then
write the K, expression for HCIO.
Answers
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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Please SHOW WORK/steps for all problems, answers already there
Answers
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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Balance the chemical equation: Fe + Cl₂ → FeCla.
Answers
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.
Why does a uranium glass glows under UV light ?
Answers
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.
In a _____, one line represents one pair of electrons being shared.
Answers
In a covalent bond, one line represents one pair of electrons being shared.
What are covalent compounds?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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What would the approximate age of an
igneous rock that contains only 1/4 of its
original carbon-14 (half-life of carbon is
5700 years)
Answers
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.
Help me please!!
Means a lot
Answers
How to identify covalent and ionic compounds?
Ionic compounds are (usually) formed when a metal reacts with nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other11 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 nature of a volcanic eruption (i.e. how explosive) is determined largely by the _____ of the magma.
A) pressure
B) color
C) density
D) chemistry
E) temperature
Answers
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
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.
Answers
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.
What is the undissolved salt mass?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.
Briefing: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:
A) The enthalpy of combustion of Octane (C8H18) is –5440 kJ mol–1. How much heat will be released by combustion of 1 kg of Octane?
B) Given the enthalpy change for the reaction:
2 HgO (s) Δ2Hg(l) + O2(g) ΔHo = 181.6 kJ mol–1
what is the enthalpy of formation of HgO?
Answers
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.
What is energy released?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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How do I go about solving this?
Answers
Answer:
A. 40.0%
Explanation: Divide 8/20=0.4 Move the decimal twice to the right BAM! you got 40%.
3. Write the names for each of the following structures.
Answers
The IUPAC names of the given organic compounds are as follows:
methanolpropan-2-ol or 2-propanolbutan-2-ol or 2-butanolhexanolheptanolWhat are the IUPAC names of the given organic compounds?The IUPAC names of the given organic compounds are derived from three parts to their name:
the root hydrocarbon - this is the longest continuous straight carbon-to-carbon chain whose name is derived from the parent alkanethe suffix - which is the main substituent ground serving as the functional group in the compoundthe prefix - other substituents in the compound that are not the functional group.The given compounds have a principal functional group of -OH which is the alkanol functional group.
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If 9.8 g of sulfuric acid is dissolved in an excess quantity of water, it will yield _______ moles of hydrogen ion ( H+) and _______ mole of sulphate ions (SO4 -2).
Answers
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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What is physical weathering?
the transformation of rocks into some other type of materials
the breaking of rock into smaller pieces from nonchemical processes
the building up of rock that has been brought from other places
the movement of rock from one place to another
Answers
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.
What is the basic unit of all living things?
O organ system
O cell
O tissue Oorgan
(PLEASE HURRY)
Answers
Answer:
Cells
Explanation:
Everything in living things is made from cells. Cells come together to make tissues, which make organs, which make organ system.
