Which of the following chemical equations are correctly balanced? Balance the equations that are not balanced.

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Answer: C7H6Br2

Explanation:

i got it right on acellus

The molar mass of methylammonium bromide is 111u.

The molar mass is defined as the mass per unit amount of substance of a given chemical entity.

Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.

Add it all together and put units of grams/mole after the number.

Atomic weight of H is 1u

Atomic weight of N is  14u

Atomic weight of C is  12u

Atomic weight of Br is  79u

Calculating molar mass of  [tex]2H_3NCH_3Br[/tex] =2(1 x3+ 14+12+ 1 x 3 +79) = 111u

Hence, the molar mass of methylammonium bromide is 111u.

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Answer:

The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters.

Answer:

Water is one of the most precious resources the earth provides to mankind. Its use in modern age is manifold. We drink water to satisfy our thirst. We use it for domestic needs, irrigation, industrial use, transportation, power production and waste disposal. Water is universal solvent.

Thanks to our nature; it is very rich in water. About three-fourth of the earth's surface is covered with water. But only a small portion of total water resources is actually available for human use. Majority, about 97.3% is present in oceans and is salty in nature.

The fresh water constitutes only 2.7%. Out of this, inland" surface waters i.e. lakes, rivers, and ponds account for hardly 0.02%. This relatively negligible portion of the earth's water is crucially important to all form of terrestrial and freshwater aquatic life. We get water mainly from three sources;

1 Rain water.

2 Surface water

3 Ground water

Answer:

The solubility mainly depends on the composition of solute and solvent (including their pH and the presence of other dissolved substances) as well as on temperature and pressure.

Explanation:

Answer:

it is removed In all types of chemical reactions, bonds are broken and reassembled to form new products. However, in exothermic, endothermic, and all chemical reactions, it takes energy to break the existing chemical bonds and energy is released when the new bonds form.

Explanation:

hope this helps if not let me know have a blessed day

Answer:

I don't now the answer but you can give branaillest to the other person how answered it

Explanation:

Answer:

All waves of the electromagnetic spectrum have a speed of 3 × 10⁸ ms⁻¹

The value of the critical angle for total internal reflection at the water-ice interface is 48.6 degrees.

The greatest angle at which a beam of light traveling through one transparent media can strike the border between that medium and a second of lower refractive index without being completely reflected within the first medium is called the critical angle in optics.

So the value of the critical angle for total internal reflection at the water-ice interface is 48.6 degrees.

Hence the resultant critical angel is 48.6 degrees.

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Answer:

[tex]\boxed{\small \sf \: Mass \: of \: H_2O =322.2 \: grams}[/tex]

Explanation:

Given:

Mass of ferous (Fe) produced = 750 gram.

To find:

Mass of water produced= ?

Solution:

Molar mass of Fe is 55.84 gram/mol

Let's find out the number of moles of ferous produced.

[tex] \small \sf Number \: of \: moles = \frac{Given \: mass \: of \: substance }{Molar \: mass \: of \: substance} [/tex]

Substituting the given data in above formula.

[tex] \small \sf Number \: of \: moles = \frac{750}{55.84} [/tex]

[tex] \boxed{\small \sf Number \: of \: moles \: of \: Fe= 13.43 \: moles}[/tex]

Now the given reaction is,

[tex]Fe_3O_4 + 4H_2 \rightarrow 3Fe + 4H_2O[/tex]

now calculate the number of moles of H2O

[tex] \sf \: \frac{3}{4} = \frac{13.43}{x} \\ \sf x = \frac{13.43 \times 4}{3} \\ \sf x = 17.90 \: moles[/tex]

[tex] \small \boxed{\sf number \: of \: moles \: of \: H_2O= 17.90 \: moles}[/tex]

mass of one mole of H2O is 18 gram, so we can calculate mass of 17.90 moles.

[tex]\small \sf \: Mass \: of \: H_2O = 17.90 \times 18 \\ \boxed{\small \sf \: Mass \: of \: H_2O =322.2 \: grams}[/tex]

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The temperature that water boils on the fahrenheit scale is c. 212°f.

Temperature conversation is a way of converting a temperature from a unit to another using conversation scale.

Therefore, on fahrenheit scale water boils at  212°f which is equivalent to 100°C on the Celcius scale.

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If the density of a gas is 1.2g/l at 745 torr and 20 degree C, then the molar mass of gas is 30 g/mole.

Ideal gas equation gives idea about the behavior of gas at different condition & represented as:

PV = nRT, where

On putting all these value in the above equation, we get moles

n = (745)(1) / (62.36)(293) =  0.04 mole

Molar mass will be calculate by using the below equation:

M = W/n, where

M = 1.2 / 0.04 = 30g/mol

Hence required molar mass of gas is 30g/mol.

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The initial movement of groundwater into the atmosphere to form clouds is due to evaporation caused by solar radiation.

Evaporation is the process by which a liquid spontaneously turns to vapor as a result of temperature increase.

Ground water moves from the ground to the atmosphere when the radiant heat from the Sun turns liquid water to vapor.

Therefore, the initial movement of groundwater into the atmosphere to form clouds is due to evaporation caused by solar radiation.

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The volume of a sample of a gas at 0°c is 100 liters, if the volume of the gas is increased to 200 L at constant pressure, then new temperature is 546K.

Relation between the volume and temperature of any gas will be explained by using the ideal gas equation:

PV = nRT

Means volume and temperature is directly proportional to each other & for this question equation becomes:
V₁/T₁ = V₂/T₂, where

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

T₂ = (200)(273) / (100) = 546 K

Hence resultant temperature of the gas is 546 K.

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Answer:

.59 g

Explanation:

5.6 d / 3.9 d /half life = 1.436 half lives

(1/2)^1.436 = .3696 of original left

.3696 * 1.6 = .59 gm

Explanation:

b. salt water is the correct answer

Which of the following is a solution?

A) milk

B) salt water

C) chlorine

D) muddy water

What is a solvent ?

A liquid that can dissolved in a solution.

What is a solute ?

A substance that is dissolved in a solution.

What is a solution ?

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.

Opition a)

Milk is not a solution. Milk is a mixture because milk has more than one phase suspended in it. Milk is a mixture of water, lipids, fats, proteins, and carbohydrates, as well as other substances.

Opition a is not the correct answer

Opition b)

Salt water is a solution. It is a solution because salt particles completely dissolve in water.

Opition b is the correct answer

Opition c)

Chlorine gas is an element. An element is a pure substance that consists of only one type of particle.

Opition d)

Muddy water is not a solution.It is a mixture. Solid dust and liquid have been mixed but the two but the two are not mixed on a molecular scale to form one state.

Opition d is not the correct answer

The value of Avogadro's number is:

[tex]N = 6.02214076*10^{23}[/tex]

So the correct option is the second one.

Avogadro's number represents the number of molecules in a mole.

The value of the Avogadro's number is such that the mass of one mole of a compound is numerically equal to the mass of that compound in daltons.

And, by definition, Avogadro's number is:

[tex]N = 6.02214076*10^{23}[/tex]

With this in mind, we conclude that the correct option is the second one.

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Answer:

Explanation:

6.02x10^23

The balloon will burst if the volume of the balloon is less than 1.68 L since 8 g of sodium bicarbonate produces 1.68 L of carbon dioxide gas.

The volume of carbon dioxide produced is obtained from the equation below:

[tex]CH_3COOH + NaCO_3 \rightarrow CH_3COONa + H_2O + CO_2 \\ [/tex]

1 mole of sodium bicarbonate reacts with one mole of acetic acid in vinegar to produce 1 mole of carbon dioxide.

The volume of 1 mole of carbon dioxide is 22.4 L

Moles of sodium bicarbonate in 8 g = mass/molar mass

molar mass of sodium bicarbonate = 106 g

moles of sodium bicarbonate = 8/106 = 0.075 moles

Moles of carbon dioxide produced = 0.075 moles

Volume of carbon dioxide = 0.075 × 22.4 = 1.68 L

Therefore, the balloon will burst if the volume of the balloon is less than 1.68 L.

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Answer:

answer is 60

Explanation:

Answer:

equation

Explanation:

Answer:

The process or effect of simplifying a single chemical entity into two or more fragments.

Explanation:

Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.

Answer:

What are some examples of decomposition reactions?

Production of calcium oxide or quicklime.

Production of lithium oxide.

Preparation of oxygen and carbon dioxide.

In metallurgy, for the extraction of metals from their oxides and chlorides through electrolytic decomposition.

Answer:

Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom. Their movement generates an electric current and causes each electron to act like a microscopic magnet

Explanation:

trust me

Answer: c, and my yt is ChezBeed

Explanation:

Boyle's Law

P₁V₁=P₂V₂

0.9 x 35 = 0.75 x V₂

V₂ = 42 L

The rate of the reaction is the speed at which the reactants are used to produce the products. An increase in temperature and concentration of the reactant increases the rate of reaction.

The rate of the reaction is the speed at which the products are used to produce products. The rate increases when the concentration of the reactants in a reaction is increased. Also, the smaller grounded pieces of reactants increase the reaction rate as the surface area gets increases.

The rise in temperature and the addition of the catalyst also increases the rate of reaction as temperature and the catalysts increase the chemical reaction by increasing the speed.

When an inhibitor is added to a reaction then the rate of the reaction decreases as they inhibit the formation of the products and block the reaction pathways.

Therefore, the inhibitors decrease the rate of the reaction.

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By applying Boyle's law, the new volume of this ideal gas is equal to 551.58 cm³.

Given the following data:

In order to determine the new volume of this ideal gas, we would apply Boyle's law.

Mathematically, Boyle's law is given by this formula:

PV = k

P₁V₁ = P₂V₂

Where:

Making V₂ the subject of formula, we have:

V₂ = (P₁V₁)/P₂

Substituting the given parameters into the formula, we have;

V₂ = (110.0 × 524)/104.5

V₂ = 57,640/104.5

V₂ = 551.58 cm³

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Answer:

A. Water changes from a solid to a liquid to a gas.

Explanation:

A decomposition reaction is the breakdown of reactants into two or more products. The concentration of dinitrogen pentoxide after 4 minutes will be 1.63 moles.

The first-order rate constant (k) is the order of the reaction that is the initial rate and is given as 1/s.

The first order is shown as:

[tex]\rm [ln] A = \rm ln [A]_{o} - kt[/tex]

Given,

Initial concentration = 0.013 M

k =  [tex]6.82 \times 10^{-3}\;\rm s^{-1}[/tex]

t = 240 seconds

Substituting values above:

[tex]\begin{aligned} \rm [ln] A &= \rm ln[0.013] - 9 6.82\times 10^{-3} \times 240)\\\\[A] &= \rm e^{ln[0.013]} - (6.82 \times 10^{-3} s^{-1} \times 240 s)\\\\& = 1.6238\end{aligned}[/tex]

Therefore, 1.63 moles will remain after 4 minutes.

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Answer:

it's A

Explanation:

The given element is, fluorine is a non-metal with symbol (F). It is a gas and belongs to the group 17 and period 2.

The atomic number of fluorine = 9

The number of electrons = 9

Answer:

its the first one... sorry for the wait was doing my homework :)

Answer:

J/gm-C

Explanation:

J/gm-C   is one set of units for specific heat

Answer:

John Dalton

Explanation:

John Dalton developed the concept tittle: Dalton Law of Partial Pressure.

The formula is: Pt = Pa + Pb + Pc...... Pn