Rafa then places some zinc in a solution of lead nitrate. A displacement
reaction takes place. Write the word equation for this reaction.

The magnetism is either created inside a given element by passing some number of charges,Q across it or it is due to the interaction with a permanent magnet.

A physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.

The magnet consists the characteristics of having an optimum amount of energy (P.E inside it) inside it.

As, the energy lines are either directed outwards from the north pole of the magnet, the south pole of the magnet consumes or absorbs the magnetic rays(energy lines) originated from the north pole of the magnet.

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Answer:

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100. Here, the quantity is measured in terms of grams of the elements present.

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Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] molecules.

This means that in 2.3 moles, there are [tex]2.3(6.022 \times 10^{23})=\boxed{1.4 \times 10^{24} \text{ (to 2 sf)}}[/tex]

Answer:

With too little air, the gas mixture will not burn completely and will form tiny carbon particles that are heated to glowing, making the flame luminous. With too much air, the flame may burn inside the burner tube; that is, it may strike back.

Answer: they have the same amount of particles

Explanation:

This statement is true by Avogadro's Law, which states that in a mole of any substance, there are [tex]6.022 \times 10^{23}[/tex] particles.

Answer:

Boyle's law states this.

If the bonds of the product store 27 KJ more energy than the bonds of the reactants, It means the surroundings absorb 27 kj of energy from the reaction system Hence, Option (D) is the correct answer

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.

The bonds of the product store 27 KJ more energy than the bonds of the reactants, It means that energy has been absorbed by the surrounding as the product formed is more stable due to more stronger bond

This can be inferred from more stored energy with in the bonds and Thus, It is a exothermic reaction.Hence, Option (D) is the correct answer

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6.023 ×[tex]10^{23}[/tex]  individual carbon atoms are there in one mole of carbon.

Mass of a 1 [tex]C_{12}[/tex] atom= 12 amu

1 amu = 1.66 ×[tex]10^{-27}[/tex] gm

∴ 12 amu =1.99 ×[tex]10^{-21}[/tex] gm

∴Mass of a 1 [tex]C_{12}[/tex] atom=1.99 ×[tex]10^{-21}[/tex] gm

Mass of C in 1 mole = 12 gm

∴Total number of atoms of carbons in 1 mole = 12 ÷ 1.99 ×[tex]10^{-21}[/tex]

∴Total number of atoms of carbons in 1 mole= 6.023 ×[tex]10^{23}[/tex]  atoms

6.023 ×[tex]10^{23}[/tex]  individual carbon atoms are there in one mole of carbon.

The number 6.023 ×[tex]10^{23}[/tex]  is known as Avogadro's number, which represents the number of individual atoms present in a one mole of substance with respect to [tex]C_{12}[/tex] atoms.

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Answer:

They have different temperatures.

Explanation:

Answer:

a. when we are rolling the dough it only changes the shape, its a physical change.

b. we cant change the shape once its cooked, its a chemical change

Explanation:

hope it helps

Answer:

12 seconds

Explanation:

Time taken by 50cm³ of oxygen to diffuse from pinhole

= 1 minute = 60 seconds

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[tex] \textsf{ Rate of oxygen} \sf (O_2) = \frac{50}{60} [/tex]

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Let time taken by 50cm³ of hydrogen to diffuse from pinhole = t seconds

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[tex] \textsf {Rate of hydrogen } \sf(H_2) = \frac{50}{t} [/tex]

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According to the formula

[tex] \sf \frac{Rate \: of \: hydrogen(H_2)}{Rate \: of \: oxygen(O_2) } = \sqrt{ \frac{Molar \: mass \: of \: O_2}{Molar \: mass \: of \: H_2} } [/tex]

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[tex] \large \sf \frac{50}{t} \div \frac{50}{60} = \sqrt{ \frac{\cancel{32}\small 16}{\cancel2} } \\ \\ \sf \large \frac{ \cancel{50}}{t} \times \frac{60}{ \cancel{50}} = \sqrt{16} \\ \\ \sf \large \frac{60}{t} = 4 \\ \\ \sf \large \frac{ \cancel{60} \: \small12}{ \cancel4} = t \\ \\ \large \underline{ \boxed{ \tt t = 12 \: seconds}}[/tex]

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Answer:

V = 25.7 L

Explanation:

To find the volume of Argon (Ar), you need to use the Ideal Gas Law equation. This looks like:

PV = nRT

In this formula,

        > P = pressure (atm)

        > V = volume (L)

        > n = number of moles

        > R = constant (0.0821 L*atm/K*mol)

        > T = temperature (K)

While there is a different constant that can be used if you want to keep the pressure in mmHg, there is a more common constant used when the pressure is in atm. So, to find the volume, you need to (1) convert mmHg to atm (by dividing by 760) and then (2) calculate the volume (using Ideal Gas Law).

(Step 1)

600 mm Hg              1 atm
-------------------  x  ---------------------  =  0.789 atm
                              760 mm Hg

(Step 2)

PV = nRT

(0.789 atm) x V = (0.825 mole)(0.0821 L*atm/K*mol)(300 K)

(0.789 atm) x V = 20.32

V = 25.7 L

Answer:

measure their densities

Answer:

seven on the ph scale is the neutral point

Explanation:

The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

Answer:

Answer:

Mass = 27.291 g

Explanation:

Given data:

Mass of sodium chloride = ?

Mass of water = 534 g

Molality = 0.875 m

Solution:

Molality:

It is the number of moles of solute into kilogram of solvent.

Formula:

Molality = number of moles of solute / kilogram solvent

Mathematical expression:

m = n/kg

Now we will convert the g into kg.

Mass of water = 534 g× 1kg/1000 g = 0.534 kg

Now we will put the values in formula.

0.875 m = n / 0.534 kg

n = 0.467 mol

Now we will calculate the mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 0.467 mol × 58.44 g/mol

Mass = 27.291 g

Considering the definition of molarity and molar mass, the mass of NaF required is 3.771 grams.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liters}[/tex].

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

In this case, you know:

Replacing in the definition of molarity:

[tex]0.15\frac{moles}{L} =\frac{number of moles}{0.6 L}[/tex]

Solving:

0.15 [tex]\frac{moles}{L}[/tex] × 0.6 L= number of moles

0.09 moles= number of moles

The molar mass of NaF is 41. 9 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 41.9 grams, 0.09 moles of the compound contains how much mass?

[tex]mass=\frac{0.09 molesx41.9 grams}{1 mole}[/tex]

mass= 3.771 grams

Finally, the mass of NaF required is 3.771 grams.

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The answer to this question is change in temperature will be 6.1 and specific specific heat capacity of metal will be 1698.36.

According to the formula of Calorimetry

Q = msΔT

where, Q = Quantity of heat absorbed (in joules)

M = Mass of water sample given (in kilogram)

S = specific heat capacity of metal

ΔT = Change in temperature

We have given,

Mass as 25 gram which is equal to 0.025 Kg.

Change in temperature as 6.1

Quantity of heat absorbed as 259 J

Applying to the formula of Calorimetry

Q = msΔT

259 = 0.025 × s × 6.1

s = 1698.36

So, specific heat capacity of metal came out to be 1698.36 and the change in temperature will be 6.1

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Answer: specific heat is 1.7

Explanation:

after you answer this question itll then tell you to find the specific heat

+3

Hence, the magnetic behaviour of the complex is paramagnetic. The oxidation number of the central metal atom: The oxidation number of the metal iron is +3.

Answer:

the oxidation number of iron in the complexion is +3 or x=+3

Answer:

1-bromo-6-chloro-5-methylheptane

Explanation:

There are 3 substituents, 1 chlorine, 1 bromine, and 1 methyl group.

The longest carbon chain consists of 7 carbons.

There are no double bonds, based on the saturation and substituents.

So you have a 1-bromo-6-chloro-5-methylheptane.

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MM Zn(NO₃)₂ = 189.36 g/mol

mass 1 mol Zn(NO₃)₂ = 189.36 g

mass hydrate = 100 / 63.67 x 189.36 = 297.409 g

mass 1 mol hydrate = 297.409 g

MM hydrate = 297.409 g/mol

MM hydrate = MM Zn(NO₃)₂ + MM xH₂O

297.409 = 189.36 + x(18)

x = 6

Answer:

a.  [tex]P_2=1.38*10^4[mmHg][/tex]

Explanation:

If the Temperature of a gas remains constant (and if the amount of gas molecules doesn't change), then compressing the gas from 12.11 L to 0.669L will increase its pressure through Boyle's Law:  [tex]P_1V_1=P_2V_2[/tex]

We'll also need to recall that atmospheric pressure with units of mmHg (since that is the unit requested in the answer) is 760 mmHg.

Letting the initial Pressure and Volume be the P1 and V1, and the final pressure be the P2 and V2, we can substitute and solve:

[tex]P_1V_1=P_2V_2[/tex]

[tex](760[mmHg])(12.11[L])=P_2(0.669[L])[/tex]

[tex]\dfrac{(760[mmHg])(12.11[L \!\!\!\!-])}{0.669[L \!\!\!\!-]}=\dfrac{P_2(0.669[L]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}{0.669[L]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}[/tex]

[tex]13757.2496[mmHg]=P_2[/tex]

Since the final pressure is only measured to 3 significant figures, we round the pressure accordingly

[tex]13800[mmHg]=P_2[/tex]

Note that in scientific notation, this is [tex]P_2=1.38*10^4[mmHg][/tex], occasionally written as [tex]1.38\text{E}4[mmHg][/tex]

266.63g of Fe2O3 would be required to make 187 g Fe in accordance with the following equation: Fe₂O3 + 3CO → 2Fe + 3CO₂.

The mass of a product or reactant can be calculated using stoichiometry as follows:

According to this question, iron oxide reacts with carbon monoxide as follows:

Fe₂O3 + 3CO → 2Fe + 3CO₂

1 mole of Fe2O3 produces 2 moles of Fe

Moles of Fe = 187/56 = 3.34mol

3.34/2 = 1.67 moles of Fe2O3 will be required to produce 3.34 moles of Fe.

mass of Fe2O3 = 1.67 mol × 159.69 g/mol = 266.63g

Therefore, 266.63g of Fe2O3 would be required to make 187 g Fe in accordance with the following equation: Fe₂O3 + 3CO → 2Fe + 3CO₂.

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Answer: The solubility of this gaseous solute will be,

Explanation :

First, we have to calculate the concentration of solute.

Now we have to calculate Henry's law constant.

Using Henry's law :

where,

C = concentration of solute =

p = partial pressure = 27.59 kPa

= Henry's law constant =?

Now put all the given values in the above formula, and we get:

Now we have to calculate the solubility of this gaseous solute when its pressure is 79.39 kPa.

Therefore, the solubility of this gaseous solute will be,

Answer:

Centimeters

Centimeter

⇒ metric unit of length equal to 0.01 (1/100) of a meter

Among the following options eating an energy bar by a hiker using a chemical potential energy.

Chemical potential energy is the energy stored in the chemical bonds of a substance.

The food we eat contains stored chemical energy.

As the bonds between the atoms in food loosen or break, a chemical reaction takes place, and new compounds are created.

The energy produced from this reaction keeps us warm, helps us move, and allows us to grow

Hence, eating an energy bar by a hiker using a chemical potential energy.

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Based on the calculations, the number of moles of fluorine atoms present is equal to 12.4 moles.

In order to determine the number of moles of fluorine atoms, we would calculate the number of atoms in 1 mole of an fluorine atoms in accordance with Avogadro's constant.

1 mole of fluorine atom = 6.02 × 10²³ molecules

X moles of fluorine atom = 7.45 × 10²⁴ molecules

Cross-multiplying, we have:

X = 7.45 × 10²⁴/6.02 × 10²³

X = 12.4 moles.

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Answer:

+1

Explanation:

The oxidation state of Hg in Hg2Cl2 is +1. It has +1 state. 0=2Hg +2 (-1) Hg=+1. Mercury chloride (HgCl2) is considered as the dominant form of mercury in coal combustion flue gas. The oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds. The oxidation number is synonymous with the oxidation state. Determining oxidation numbers from the Lewis structure (Figure 1a) is even easier than deducing it from the molecular formula (Figure 1b). The oxidation number of each atom can be calculated by subtracting the sum of lone pairs and electrons it gains from bonds from the number of valence electrons. Bonds between atoms of the same element (homonuclear bonds) are always divided equally. When dealing with organic compounds and formulas with multiple atoms of the same element, it's easier to work with molecular formulas and average oxidation numbers (Figure 1d). Organic compounds can be written in such a way that anything that doesn't change before the first C-C bond is replaced with the abbreviation R (Figure 1c). Unlike radicals in organic molecules, R cannot be hydrogen. Since the electrons between two carbon atoms are evenly spread, the R group does not change the oxidation number of the carbon atom it's attached to.  

source: www.chegg.com

Answer: O A. +1

Explanation: i took the test

[tex]KNO_3[/tex] at 70°C = 130 gram

NaCl at 100°C= 40 gram

NH₂Cl at 90°C= 70 gram

Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.

Amount of a substance (called the solute) that dissolves in a unit volume of a liquid substance (called the solvent) to form a saturated solution under specified conditions of temperature and pressure. Solubility is expressed usually as moles of solute per 100 grams of solvent.

Hence,

[tex]KNO_3[/tex] at 70°C = 130 gram

NaCl at 100°C= 40 gram

NH₂Cl at 90°C= 70 gram

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