what is the best "determiner" for identifying if it is a metal?
I need the answer please

Answer:

Hydrogen

Explanation:

Hydrogen can never be central atom despite its low electronegativity

Let's see

[tex]\\ \rm\rightarrowtail H_2+S=H_2S+Heat[/tex]

So

Observe the equation

it releases heat means it's exothermic

So

Answer:

Mendeleev left some gaps in his periodic table because he believed that in future more elements will be discovered.

Explanation:

"Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements."

Answer:

208.8018 g/Mol you conver the answer by weight and moles

The thermochemical equation for the combustion of butane is:

C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g)   ΔH = -2877.5 kJ

It informs us of the entalphy of the reaction and it includes the states of aggregation.

A thermochemical equation is a balanced stoichiometric chemical equation that includes the enthalpy change, ΔH.

C₄H₁₀ + 6.5 O₂ ⇒ 4 CO₂ + 5 H₂O

To the previous equation, we will add the enthalpy change and the states of agregation.

C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g)   ΔH = -2877.5 kJ

The thermochemical equation for the combustion of butane is:

C₄H₁₀(g) + 6.5 O₂(g) ⇒ 4 CO₂(g) + 5 H₂O(g)   ΔH = -2877.5 kJ

It informs us of the entalphy of the reaction and it includes the states of aggregation.

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The mass of  potassium chlorate, KClO₃ needed to produce 30 grams of potassium chloride, KCl is 49.33 grams

2KClO₃ —> 2KCl + 3O₂

Molar mass of KClO₃ = 39 + 35.5 + (16×3) = 122.5 g/mol

Mass of KClO₃ from the balanced equation = 2 × 122.5 = 245 g

Molar mass of Kcl= 39 + 35.5 = 74.5 g/mol

Mass of KCl from the balanced equation = 2 × 74.5 = 149 g

SUMMARY

From the balanced equation above,

149 g of KCl were obtained from 245 g of KClO₃

From the balanced equation above,

149 g of KCl were obtained from 245 g of KClO₃

Therefore,

30 g of KCl will be obtained from = (30 × 245) / 149 = 49.33 g of KClO₃

Thus, 49.33 g of KClO₃ are needed for the reaction

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Based on the data provided, the mass of the object is inversely proportional to acceleration and directly proportional to the time taken to cover the distance.

Given that the force applied on an object is constant, the acceleration of the object is inversely proportional to the mass of the object.

According to the Newton's second law of motion, the acceleration of an object is inversely proportional to the mass of the object and directly proportional to the force and takes place in the direction of the applied force.

Based on the data provided, the more mass the car has, the more time it takes to complete the distance.

Therefore, it can be concluded that the mass of the object is inversely proportional to acceleration and directly proportional to the time taken to cover the distance.

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An electric motor works by converting electrical energy to mechanical energy in order to create motion.

For example,Force is generated within the motor through the interaction between a magnetic field and winding alternating (AC) or direct (DC) current.

This works because…

Answer : When an electric current flows through the wire in the electromagnet, a magnetic field is produced in the coil.

[tex]\:\mathsf{Hope\:this\:helps\:you!}[/tex]

Answer:

when an electric current flows through the wire in the electromagnet , a magnetic field is produced in the coil .

Explanation:

Hey there!

C. Candle

Explanation:

Answer. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. and not used for the production of candles. Commercially available candles are made with paraffin wax.

Answer:

Carbohydrates

Explanation:

first of all, I took a quiz and got it right but also Carbohydrates fuel the body and are broken down and made into glucose that can be absorbed into the bloodstream. so when absorbed into the bloodstream they travel in the blood to the body's cells where they are used for respiration.

Answer:

Phosphorus

Explanation:

Actually that's red Phosphorus

Answer:

Option B. ( Phosphorus)

Explanation:

Here, we want to select the option which is the main component present in the striking surface of a matchbox

The correct choice here is phosphorus

Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.

Hope this helps!

If you have any queries please ask.

The temperature change that indicates an increase in the average kinetic energy of the molecules in a sample is 255 K to 0°C.

Chemical reactions occur when particles of reactants react or collide with one another, hence, when particles collide faster, reaction also occurs faster.

One of the ways to make reactions occur faster i.e. increasing the average kinetic energy is by increasing the temperature.

The example that depicts an increase in temperature is 255K to 0°C, which is equivalent to 255K to 273K.

Therefore, the temperature change that indicates an increase in the average kinetic energy of the molecules in a sample is 255 K to 0°C.

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Answer:

yay well done good job keep going

Ca is the correct answer. Maybe

Answer:

[tex]\sf\large\underline\purple{Fractional\: Distillation:-}[/tex]

[tex]\rightarrow[/tex]The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.

[tex]\rightarrow[/tex]The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.

[tex]\sf\underline\green{Applications\: Of\:Fractional\: Distillation:-}[/tex]

________________________________

Hope it helps you:)

The genotypes are not found in the question, but p and q can be used to calculate genotypic frequencies by using the equation p2 + 2pq + q2 = 1.

The Hardy–Weinberg principle is a model used in population genetics to estimate allele and genotypic frequencies in a population.

According to the Hardy–Weinberg principle, the sum of p + q is equal to 1, where p and q represent the dominant and recessive alleles, respectively.

The Hardy–Weinberg principle considers the absence of different evolutionary forces acting on the population.

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The formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.

The number of people with a particular genotype divided by the total number of people in a population is known as genotype frequency.

p2 + 2pq + q2 = 1 is the Hardy Weinberg equation.

Thus, the formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.

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2Na + 2H2O → 2NaOH + H2

The balanced equation

Answer:

Single atoms of elements are not molecules.

Explanation:

A single oxygen, O, is not a molecule. When oxygen bonds to itself (e.g., O2, O3) or to another element (e.g., carbon dioxide or CO2), molecules are formed

Answer:

3.0 atm

Explanation:

got it right on edge after guessing 2 times

The resulting pressure of the gas after decreasing the initial volume is 3 atm.

According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:

P ∝ 1/V

For the given question required equation is:

P₁V₁ = P₂V₂, where

P₁ = initial pressure = 1.5 atm

V₁ = initial volume = 2 L

P₂ = final pressure = ?

V₂ = final volume = 1 L

On putting all these values on the above equation, we get

P₂ = (1.5)(2) / (1) = 3atm

Hence required pressure is 3 atm.

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Since iron is more reactive than copper, when steel wopl is placed in a solution of copper (II) sulfate solution into a small beaker, it dissolves and copper metal is produced.

A displacement reaction is one in which a more reactive element displaces another from its compound.

Reactive metals displace less reactive metals from their solutions.

Iron is a more reactive metal than copper and will displace copper from a solution of its salt.

Therefore, when steel wool is placed in a solution of copper (II) sulfate solution into a small beaker, the iron dissolves and copper metal is produced.

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Answer:

The sum of the kinetic energies and potential energies of all of the molecules in a substance is called the thermal energy of the substance.

There are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.

The number of moles of a substance can be calculated by using the following formula:

molarity = no. of moles / volume

According to this question, a volume of 2300 mL solution is contained in 0.68 M MgSO4. The number of moles is calculated as follows:

no of moles = 0.68M × 2.3

no. of moles = 1.56

Therefore, there are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.

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Germanium (Ge) has properties that are similar to silicon.

Thermohaline circulation that occur in the ocean part that flows across sea surface help to supply heat to polar regions.

The thermohaline circulation refer to a section and region of the ocean circulation which is majorly driven by heat gradient and freshwater that flows across the sea surface and also from the mixture of heat and salt that occur at the inside part of the ocean.

Therefore, Thermohaline circulation help to supply heat to polar regions.

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Species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.

The term resonace has to do with the movement of electron pairs in a molecule. Inductive effects has to do with the drawing of electron density towards an atom or bond.

The two effects depends on the nature of a substituent. For instance, species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.

The question is incomplete hence the exact nature of the substituents can not be determined.

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In resonance, the species with lone pairs donate electrons while the substituent takes electrons away from another species when deficient by resonance.

When the electron donor or the withdrawal groups creates the electron density on the molecule then it is called the inductive effect. This results in the creation of permanent dipoles in the bonds of the molecules.

Atom attached to a benzene molecule with higher electronegativity than hydrogen atom then, it will be an acceptor while with lower electronegativity will be a donor.

The movement of the electron pair like lone pair and pi bond in a molecule by the delocalization is called the resonance effect. The electron donation and acceptance depend on the nature of the substituent molecule.

If the atom attached to the benzene molecule is electron-rich, it will be a donor, while the electron-deficient will accept the electron by the method of resonance effect.

Therefore, the nature of the substituent determines the resonance and the inductive effect.

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The percent yield of H₂O, if 87.0 g of H₂O is produced by combining 95.0 g of O₂ and 11.0 g of H₂ is 87.87%.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = given or required mass

M = molar mass

Moles of 95g of Oxygen (O₂) = 95g / 32g/mol = 2.96 moles

Moles of 11g of hydrogen (H₂) = 11g / 2g/mol = 5.5 moles

Given chemical reaction is:
2H₂ + O₂ → 2H₂O

From the stoichiometry of the reaction, it is clear that:

1 moles of O₂ = reacts with 2 moles of H₂

2.96 moles of O₂ = reacts with 2×2.96=5.92 moles of H₂

Here hydrogen is the limiting reagent as it has lower moles and formation of water depends on this only.

2 moles of H₂ = produces 2 moles of water

5.5 moles of H₂ = produces 5.5 moles of water

Mass of 5.5 moles of water will be calculated as:

W = (5.5mol)(18g/mol) = 99g

Given theoretical yield of water = 87g

% yield of water will be calculated as:
% yield = (87 / 99)×100 = 87.87%

Hence required value is 87.87%.

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Answer:

D

Explanation:

Answer:

sulphuric acid and nitric acid

Explanation:

The acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.

Acids are those solutions that are sour in taste and have lower pH to 7.

Hydrofluoric acid is highly corrosive, made up of hydrogen and fluorine.

Phosphoric acid is an important oxygen of phosphorus.

Thus, the acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.

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Answer:

that's because

Explanation:

as far as my knowledge is concerned

HCl(g) + H2O ⇄ H3O+ (aq) + Cl– (aq)

or, more simply (and truer to the original theory):

HCl(g) ⇄ H+ (aq) + Cl– (aq) or HCl(aq)