Is burning a lot a physical or chemical change?

Answer:

There are no units with electro negativity. Linus Pauling designed a scale of electro negativity that ranks elements with respect to each other. So, for example, fluorine is a 4.0 in comparison to 0.7 for francium.

Explanation:

Answer:

The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.

Explanation:

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Answer:

a different number of neutrons in their nuclei.

Explanation:

Explanation:

Rats and mice are both rodents, so look similar - the biggest difference is their size. Rats are larger and heavier while mice have smaller slender bodies. Mice also have long slender tails (for their body size) covered in hair compared to rat tails which are shorter, thicker and hairless

Answer:

पेरिोदिछ ताबले माछकिनौय

Answer:

on the right side of the periodic table

To do this, just take the given miles and multiply it with the ratio of molecules in the chemical equation to get your answer.

Explanation:

For Mg, (1.2 g Mg/24 g Mg) = 0.05 mol Mg.

For Cl, (3.55 g Cl/35.5 g Cl) = 0.1 mol Cl

So the ratio now is

Mg:Cl = 0.05 : 0.1 = 1:2

I got the 1:2 ratio by dividing both by the smallest number, which is 0.05 mol. Therefore, the empirical for formula of the substance is [tex]MgCl_2[/tex]

The empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.

To determine the empirical formula of the compound formed when magnesium (Mg) reacts with chlorine (Cl), we need to find the ratio of the elements in terms of moles.

First, we calculate the number of moles of each element:

Moles of Mg = Mass of Mg / Molar mass of Mg

Moles of Mg = 1.2 g / 24 g/mol

Moles of Mg = 0.05 mol

Moles of Cl = Mass of Cl / Molar mass of Cl

Moles of Cl = 3.55 g / 35.5 g/mol

Moles of Cl = 0.1 mol

Next, we determine the simplest whole-number ratio between the moles of Mg and Cl:

Mg:Cl = 0.05 mol : 0.1 mol

To simplify the ratio, we divide both values by the smaller value (0.05 mol in this case):

Mg:Cl = 0.05 mol / 0.05 mol : 0.1 mol / 0.05 mol

Mg:Cl = 1 : 2

Therefore, the empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.

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Answer:

because it has the same number of protons as electrons.

Answer:

787.401575 inches

Answer:

[tex]\boxed {\boxed {\sf 2.001 \ mol \ Al_2O_3}}[/tex]

Explanation:

We are asked to convert grams of aluminum oxide to moles. We will do this using the molar mass or mass of 1 mole of a substance. The values are found on the Periodic Table. They are equal to the atomic masses, but the units are grams per mole instead of atomic mass units.

We have the compound aluminum oxide or Al₂O₃. We must look up the molar masses of the individual elements: aluminum and oxygen.

The formula of the compound has subscripts (a subscript of 2 after Al and subscript of 3 after O). There are 2 moles of aluminum and 3 moles of oxygen in 1 mole of aluminum oxide. We must multiply the molar mass by its subscript.

We convert using dimensional analysis, so we set up a ratio using the molar mass.

[tex]\frac {101.960076 \ g \ Al_2O_3}{ 1 \ mol \ Al_2O_3}[/tex]

We are converting 204.0 grams to moles, so we multiply by this value.

[tex]204.0 \ g \ Al_2O_3 *\frac {101.960076 \ g \ Al_2O_3}{ 1 \ mol \ Al_2O_3}[/tex]

Flip the ratio so the units of grams of aluminum oxide cancel.

[tex]204.0 \ g \ Al_2O_3 *\frac { 1 \ mol \ Al_2O_3}{101.960076 \ g \ Al_2O_3}[/tex]

[tex]204.0 *\frac { 1 \ mol \ Al_2O_3}{101.960076}[/tex]

[tex]\frac {204.0}{101.960076} \ mol \ Al_2O_3[/tex]

[tex]2.00078313 \ mol \ Al_2O_3[/tex]

The original measurement of grams has 4 significant figures, so our answer must have the same. For the number we found, that is the thousandth place. The 7 in ten-thousandth place tells us to round the 0 up to a 1.

[tex]2.001 \ mol \ Al_2O_3[/tex]

204.04 grams of aluminum oxide is equal to approximately 2.01 moles of aluminum oxide.

Answer:

B

You are only trained as a Fry man kitchen helper in your restaurant. One day, one of the trained kitchen helpers assigned to the sauté station was absent. The Executive chef immediately assigned you to the sauté station by force.

What will you do considering that you have no training in that station?

Lanthanoids and actinoids are transition elements of the periodic table. These elements are lustrous and malleable and can conduct thermal energy and electricity. Thus, option A is correct.

Lanthanoids and actinoids are the terms used to refer to the elements of the f-block of the periodic table that are placed separately due to the difference in their electronic structures.

These elements show the property somewhat similar to that of the metals and hence are lustrous and malleable. Due to the transition electron phase, they are used in optical devices and cardiac pacemakers.

The lanthanoids and actinoids are good conductors of heat and electricity as their electrons can be transferred and carry charges like metals.

Therefore, option A. the lanthanoids and actinoids are conductors and are malleable.

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Answer:

5) C

6) D

7) D

8) C

Explanation:

Answer:

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Answer:

The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy

Explanation:

a ball held in the air is the example of a change from gravitational potential energy to kinetic energy.

hi <3

the cloudiness is caused by the production of carbon dioxide

hope this helps :)

Answer:

Lime water is calcium hydroxide with formula

[tex]{ \sf{Ca(OH)_2}}[/tex]

when calcium hydroxide reacts with the gas [ carbon dioxide ]

[tex]{ \sf{Ca(OH)_{2(aq)} + CO_{2(g)} → CaCO_{3(s)} + H_2O_{(l)}}}[/tex]

Calcium carbonate is white cloudy precipitate

To solve such this we must know the concept of redox reaction. Therefore, Zn is the reducing agent represented by the given cell notation

Zn(s) ∣ Zn2+(aq) ∣∣ Ag+(aq) ∣ Ag(s)

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Zn is the reducing agent in the given reaction. The component that undergoes oxidation is known as a reducing agent.

Therefore, Zn is the reducing agent in the given reaction.

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Answer:

[tex]\boxed {\boxed {\sf A. \ 12.5 \ grams}}[/tex]

Explanation:

We are asked to find the mass of 2.34 × 10²³ atoms of sulfur (S)

First, we convert atoms to moles using Avogadro's Number of 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. For this question, the particles are atoms of sulfur. There are 6.022 × 10²³ atoms of sulfur in 1 mole of sulfur.

We will convert using dimensional analysis, so we must set up a ratio.

[tex]\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}[/tex]

We are converting 2.34 × 10²³ atoms of sulfur to moles, so we multiply the ratio by this value.

[tex]2.34 \times 10^{23} \ atoms \ S* \frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}[/tex]

Flip the ratio so the units of atoms of sulfur cancel.

[tex]2.34 \times 10^{23} \ atoms \ S* \frac{1 \ mol \ S} {6.022 \times 10^{23} \ atoms \ S}[/tex]

[tex]2.34 \times 10^{23}* \frac{1 \ mol \ S} {6.022 \times 10^{23}}[/tex]

[tex]\frac{2.34 \times 10^{23}} {6.022 \times 10^{23}} \ mol \ S[/tex]

[tex]0.3885752242 \ mol \ S[/tex]

Next, we convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. The value is found on the Periodic Table as the atomic mass, but the units are grams per mole instead of atomic mass units. Look up sulfur's molar mass.

Set up another ratio.

[tex]\frac {32.07 \ g \ S}{ 1\ mol \ S}[/tex]

Multiply by the number of moles we calculated.

[tex]0.3885752242 \ mol \ S *\frac {32.07 \ g \ S}{ 1\ mol \ S}[/tex]

The units of moles of sulfur cancel.

[tex]0.3885752242 *\frac {32.07 \ g \ S}{ 1}[/tex]

[tex]0.3885752242 * {32.07 \ g \ S}[/tex]

[tex]12.46160744 \ g \ S[/tex]

The original value of atoms (2.34 × 10²³) has 3 significant figures (2,3, 4), so our answer must have the same. For the number we calculated, that is the tenths place. The 6 in the hundredth place tells us to round the 4 up to a 5.

[tex]12.5 \ g \ S[/tex]

There are 12.5 grams of sulfur in 2.34 × 10²³ atoms of sulfur.

Thermometers are used to measure temperatures. The temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

Given that:

[tex]EMF = 15mv[/tex]

[tex]T_1 =20^oC[/tex] --- Temperature at cold junction

[tex]s = 0.03mv/^oC[/tex] ---- Sensitivity

The temperature [tex]T_2[/tex] at the hot junction is calculated as follows:

[tex]T_2 = \frac{EMF}{s} + T_1[/tex]

So, we have:

[tex]T_2 = \frac{15mv}{0.03mv/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03}^oC + 20^oC[/tex]

[tex]T_2 = 500^oC + 20^oC[/tex]

[tex]T_2 = 520^oC[/tex]

Hence, the temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

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Answer:

2.98 g CO2

Explanation:

1. Balance the chemical equation

1 Fe2O3 + 3CO ->  2Fe + 3CO2

2. Use periodic table to find mass from each CO2 and Fe2O3  

3. Calculate

3.60 g Fe2O3 x [tex]\frac{1 mol Fe2O3}{159.69 g Fe2O3}x\frac{3 mol CO2}{1 mol Fe2O3}[/tex] x[tex]\frac{44.01 g CO2}{1 mol CO2}[/tex] =  2.98 g CO2

The grams of CO, produced when 3.60 g of Fe 0 reacts with excess CO is 2.98 grams Co2.

Mass is the quantity of matter of a physical body.

The balanced equation is

[tex]\rm Fe_2O_3 + CO - > Fe + CO_2[/tex]

The calculation is

[tex]3.60 g \;Fe_2O_3 \times \dfrac{ 1 mol\;Fe_2O_3}{159.69} \times \dfrac{3 mol CO_2}{1 mol \;Fe_2O_3 } \times \dfrac{44.01\;CO_2}{1 mol\; CO_2} = 2.98 g\;CO_2[/tex]

Thus, the grams of CO, produced when 3.60 g of Fe 0 reacts with excess CO is 2.98 grams Co2.

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Answer:

dew is wet and clouds are not

Explanation:

Answer:

CH3OH

Explanation:

has hydroxide ions

Solubility has been the property of the substance to get dissolved to form the solution. Methanol (CH₃OH) is more soluble in water than Diiodomethane (CH₂I₂).

Solubility is best defined as the capability of the substance to get dissolved or dissociated into a solvent for the formation of the solution at a given temperature. The solubility of the various substances varies and is an important part of the mixture and solution.

Solubility in water has been the measure of the solute to get dissolved in water. The pressure and the temperature of the system directly affect the solubility of any substance in a solvent. Water is a polar molecule with hydrogen bonds in a great solvent that dissolves almost all the molecules like salt, sugar, etc.

Methanol is soluble in water as it contains hydrogen bonds as the intermolecular forces that interact with the polar water molecule by the virtue of the hydroxide and the hydrogen ions that show the molecular attraction and allows the molecule to get dissolved.

Therefore, methanol is soluble in water.

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Answer:

I think that:

The tendency of an object to resist changes in motion: inertia

Attractive force:gravity

And everything else is right

Explanation:

I am not a physicist

But I passed physics with an A

Answer:

Not sure but I think it is C!

Explanation:

Explanation:

We can measure the weight or mass of something by using beam balance.

The final product of the reaction is 4-amino-3-hydroxy-1-acetylbenzene, also known as N-acetylanthranilic acid.

A catalyst is a substance that accelerates or reduces the temperature or pressure required to initiate a chemical reaction without being consumed in the process.

The Friedel-Crafts acylation reaction occurs when benzene reacts with acetic anhydride in the presence of an acid catalyst.

The acid catalyst activates the acetic anhydride to form an acylium ion intermediate in this reaction. This intermediate reacts with the benzene ring, giving it an acetyl group.

On carbon 1, there is a hydroxy group, and on carbon 4, there is an NH2 group.

Both of these functional groups are activating groups, which means they donate electrons to the benzene ring and increase its reactivity to electrophilic aromatic substitution reactions like Friedel-Crafts acylation.

Acetic anhydride adds an acetyl group to the benzene ring in a regioselective manner, which means it only adds to one position on the ring.

Thus, in this case, it adds to carbon 1, which is more reactive than carbon 4 due to the presence of the hydroxy group.

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Answer:

The atomic number of an atom [ number of protons ] is the number of electrons of an atom.

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