The is the
variable that
gets measured

A fireplace poker glowing red when you heat it in the fire is referred to as a physical change.

This change is a reversible one in the physical properties of a substance such as the size, color etc. Physical change doesn't alter or change the chemical composition of a substance and no new products are formed in this process.

A fireplace poker glowing red when you heat it in the fire doesn't change the composition and is reversible when allowed to cool down which is why physical change was chosen as the most appropriate choice.

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If a 5.68-g sample of ZnS contains 3.80 g of Zn then the mass of Zn that can be obtained from 7.53 kg of Zns. is 5.04kg so correct option is

(b) 5.04kg.

With the provided data, we can first determine the mass percent content of zinc in ZnS:

(Mass of Zn / Mass of ZnS) times 100% Equals mass percent of Zn

3.80 g / 5.68 g x 100%, where mass percent of Zn

Zn mass percentage is 66.9%.

This indicates that zinc accounts for 66.9% of the mass of ZnS. This number can be used to determine how much Zn can be extracted from 7.53 kg of ZnS:

mass of Zn from 7.53 kg of ZnS is equal to (66.9 / 100) × 7.53 kg, or 5.04 kg.

As a result, 5.04 kg of Zn can be extracted from 7.53 kg of ZnS. 5.04 kg is the correct answer (b).

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1. The IUPAC name of N is nitrogen.

2. Nitrogen dioxide

3.The IUPAC name of O is oxygen

4.The IUPAC name of OH is hydroxyl.

The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.

IUPAC names for the given compounds are:1.1. N: Nitrogen

The IUPAC name of N is nitrogen.

It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide

Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.

The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen

Explanation: The IUPAC name of O is oxygen.

It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.

X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.

Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.

It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.

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Note: The complete question is given below

Provide the IUPAC names for the following compounds:

\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)

C6H5CH(CH3)2

H2NCH2CH2CH2CH2CH2NH2

CH3CH2CH2CH2CH2OH

CH3CH2CH2CHOHCH3

Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.

One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:

2 H2O → 2 H2 + O2

Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:

2 H2 + O2 → 2 H2O

I hope this helps you understand how H2 can be broken down and what methods are used to do so.

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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Answer:

784 gm

Explanation:

Liquid water appears inside the bottom of a beaker with ice cubes in it when the beaker is held over a candle flame. This indicates that one

product of the combustion of a candle is  water vapor.

The beaker with ice cube in it shows the vaporization of water in heating when we held it over candle then it appears that water vapor is the one product of the combustion.

Thus, Liquid water appears inside the bottom of a beaker with ice cubes in it when the beaker is held over a candle flame. This indicates that one

product of the combustion of a candle is water vapor.

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The percent yield of the reaction is 45.44%

Percentage yield is basically,

 \(\rm Percent\ yield\ = \frac{actual\ yield}{theoretical\ yield} \times 100\)

2 NaOH + H₂SO₄ → Na₂SO₄ + 2 H₂O

To calculate the theoretical yield, consider the stoichiometry of the reaction.

2 moles of NaOH reacts with 1 mole of H₂SO₄ to give 1 mole of Na₂SO₄ and 2 moles of H₂O. The mole ratio of H₂SO₄ and Na₂SO₄ is 1:1

For this mole ratio to be useful, convert the given concentration of H₂SO₄ into moles.  

     \(\rm Molarity\ =\ \frac{No.\ of\ moles}{Volume\ of\ solution (L)}\)

            \(\rm 3.10\ =\ \frac{No.\ of\ moles}{0.125}\)

\(\rm No.\ of\ moles\ =\ 3.10 \times 0.125\\)

                     \(=\ 0.38\)

Since, mole ratio of H₂SO₄ and Na₂SO₄ is 1:1

Amount of Na₂SO₄ formed would be also 0.38 mol

Convert this amount in moles to amount in grams

\(\rm No.\ of\ moles\ =\ \frac{Mass\ formed\ }{Molecular\ mass}\)

\(\rm Mass\ formed\ =\ No.\ of\ moles\times molecular\ mass\)

                     \(\rm =\ 0.38\times 142.04\)

                     \(\rm =\ 53.97\ grams\)

Theorical yield of Na₂SO₄ is 53.97 grams

Therefore,   \(\rm Percent\ yield\ = \frac{actual\ yield}{theoretical\ yield} \times 100\)

                                          \(\rm =\ \frac{24.5}{53.97}\times 100\)

                                          =  45.44%

The percent yield of the reaction is 45.44%

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Answer:

Translucent

Explanation:

Transparent vs Translucent

Transparent: When light comes in contact with transparent materials, nearly all of it goes straight through it

Translucent: When light comes in contact with translucent materials, only some of it will go through it such as plastics or frosted glass.

Answer:

d) is an activator and an ortho/para- director

Explanation:

We options for this question are:

a) is a deactivator and an ortho/para- director

b) is a deactivator and a meta-director

c) is an activator and a meta-director

d) is an activator and an ortho/para- director

e) is an activator and an ortho/meta/para director

f) none of the above

We have to remember that Cl is a halogen, therefore a lone pair of electrons will be involved in the resonance (see figure 1). So, we will have activation in the ortho and para positions.  We have to take into account that the halogens have a high electronegativity. This means that inductively they are electron-withdrawing. So, we will have opposite phenomenons that will result in very weak activation

The dissociation of cadmium chloride is as follows: CdCl₂(s) → Cd⁺²(aq) + 2Cl⁻(aq)

Dissociation is the process by which a compound body breaks up into simpler constituents; said particularly of the action of heat on gaseous or volatile substances.

It is a chemical reaction in which a compound breaks apart into two or more components. The general formula for a dissociation reaction follows the form:

AB → A + B

According to this question, cadmium chloride undergoes dissociation into cadmium and chlorine ions as follows:

CdCl₂(s) → Cd⁺²(aq) + 2Cl⁻(aq)

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Answer:

yes

Explanation:

Answer:

climate change

Explanation:

climate change is driving force of evolution because when the climate is changed the animal and human need to adapt to it's natural change.

A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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Given:

mass of organic compound --- 0.246 g

mass of CO2 formed ----- 0.198 g

percentage of Carbon = 12 x mass of CO2 formed x 100

44 mass of organic compound

percentage of carbon = 12 /44 x 0.198/0.246 x 100

percentage of carbon = 2.376/10.824 x 100

% carbon = 0.2195 x 100

%carbon = 21.95

----------------------------------------------------------

Percentage of hydrogen =2/18× mass of H2O/mass of compound×100 = 2×0.1014×100/18×0.246 = 4.58

Hence,the composition of compounds are

CARBON : 21.95%

HYDROGEN : 4.58%.

All the best if u guys get more doubts ask me i will help u out of it.

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

Chlorine tetrachloromethane

Explanation:

Answer:The name of this compound is carbonic acid.

Explanation:

Answer: To be separated using GC, analytes must be volatile.

An air peak is commonly used to determine the dead time when using a TCD detector.

An FID is insensitive to non-combustible gases such as water and carbon dioxide.

A column temperature equal to or slightly above the average boiling point of the sample components results in a reasonable elution time.

Explanation:

The gas chromatography works on the principle of separation of gaseous substances based on the differences of vapor pressure. The thermal conductivity detector works on the principle of detection of effluents from the has chamber and the air peak gives indication of the retention time of the effluents. Flame ionization detector can be used for the detection of organic compounds but insensitive for the detection of halogens, non-combustible substances like carbon dioxide and water. The temperature of the column is kept higher than the average boiling point of the substance so as to attain separation of substances by the differences in the elution time.

The balanced reaction equation of the reaction is; 2H2O + O2 → 2H2O2

This is a chemical equation that represents the reaction between water (H2O) and oxygen (O2) to form hydrogen peroxide (H2O2). The coefficients in front of each substance indicate the relative number of molecules involved in the reaction.

Recall that we can balance the reaction equation  by ensuring that the atoms of the elements on both sides of the reaction equation are the same as we have above.

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Based on the given reaction, the acid-base pairs in this reaction are:

An acid-base pair refers to a set of two chemical species that are related through the transfer of a proton (H+ ion) during a chemical reaction.

One species acts as an acid by donating a proton, while the other acts as a base by accepting that proton.

In the given reaction:

HCO₃⁻ (aq) + NH₃ (aq) → NH₄⁺ + CO₃²⁻

An acid-base pair can be identified as follows:

HCO₃⁻ (bicarbonate ion) can act as an acid by donating a proton (H⁺), becoming CO₃⁻.

NH₃ (ammonia) can act as a base by accepting a proton (H⁺), becoming NH₄⁺ (ammonium ion).

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The statement that our energy supply is running out is false in accordance with the law of conservation of energy.

The law of conservation of energy states that the energy possessed by an object or physical body can neither be created nor destroyed, but it can only be transformed from one form of energy to another.

This ultimately implies that, we cannot run out of energy supply because the energy we generate from any source can't be destroyed in accordance with the law of conservation of energy.

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Answer:

M= ml - 45301 - 11.59M.

Explanation:

Answer:

I ratio is

47 : 43 ratio

The structure of  the alkyne 4 - decyne is shown in the image attached.

Alkyne functional group compounds with a triple bond made of carbon and carbon contain 4-decyne (C). The triple bond is found at the fourth carbon position in the ten-carbon chain (decyne) of 4-decyne.

Nine hydrogen atoms (H) are joined to the first nine carbon atoms (C), starting from the left side.

In conclusion, 4-decyne is made up of a chain of ten carbon atoms, with the fourth carbon atom serving as the center of a carbon-carbon triple bond (C). Except for the carbon involved in the triple bond, all carbon atoms are connected to hydrogen atoms.

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Multiply the number of moles of glucose by the molar mass of water (18.015 g/mol) to find the mass of water vapor produced.

To determine the mass of water vapor produced in the reaction, we need to analyze the data provided in the data table. The reaction mentioned is the process of cellular respiration, where glucose (C6H12O6) combines with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). We can use the principle of conservation of mass to calculate the mass of water vapor produced.The data table should provide the initial masses of glucose and oxygen, as well as the final mass of carbon dioxide. From these measurements, we can calculate the mass of water vapor.First, determine the number of moles of glucose and oxygen by dividing their respective masses by their molar masses. Then, use the balanced equation for cellular respiration to determine the mole ratios between glucose, oxygen, carbon dioxide, and water.

The balanced equation for cellular respiration is:

C6H12O6 + 6O2 -> 6CO2 + 6H2O

Based on this equation, we know that for every mole of glucose, 6 moles of water are produced.In conclusion, by using the principles of conservation of mass and stoichiometry, you can calculate the mass of water vapor produced in the reaction based on the given measurements.

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Jordan is immediately happier when he sees a child walking around with a bunch of balloons, it is a cultural attitude. These attitudes shape our social behaviors.

An individual's attitude refers to the way of thinking and/or feeling about something in particular.

Cultural attitudes refer to the personal system of cultural beliefs that affect and shape specific social behaviors.

Cultural attitudes indicate and trace determined social standards of socio-cultural beauty in order to shape our behavior.

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Answer:

V=mass/Density

Explanation:

Since density is measured as grams/mL or grams/cm^3 and we are interested in converting mass to volume, we need to rewrite the equation.
Therefore, in order to convert the gram to mL, you just need to multiply the mass of the substance in grams with its density to get the volume in liters.

Answer:

Volume equals mass divided by density.

and

Mass equals density times volume.

Hope this helps :)

Pls brainliest...

Answer:

Invalid

Explanation:

Answer:

Accurate

Explanation:

29 is not the best answer depends on the context and the rules for significant figures.

What is best answer?

The best answer depends on the context and the rules for significant figures. If we assume that we need to round to three significant figures:

Therefore, 29 is not the best answer.

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