HBr + Mg(OH)2 —> MgBr2 + H2O
Please balance this equation

Answer:

A scientific law is a statement that can usually be expressed as a mathematical equation that describes an occurrence in nature. At the time a law is made there are no exceptions to the law. However, over time, conditions may be observed that make the law true only in certain conditions.

Explanation:

Answer:

Turn it into a equation

Explanation:

Simple

Answer:

2.26 g

Explanation:

Data given:

mass of Sulfuric acid = 3.24 g

mass of Aluminum hydroxide = 0.945 g

Theoretical yield of Aluminum sulfate = ?

Solution:

First we look for the balance reaction

Reaction

       3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

Now we look for the limiting reactant on which the amount of aluminum sulfate depends

So,

         3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

          3 mol         2 mol

from above reaction it is clear that 3 mole of H₂SO₄ combine with 2 mole of Al(OH)₃

Convert moles to mass

• molar mass of Al(OH)₃

molar mass of Al(OH)₃ = 27 + 3(16 + 1)

molar mass of Al(OH)₃ = 27 + 45

molar mass of Al(OH)₃ =72 g/mol

• molar mass of H₂SO₄

molar mass of H₂SO₄ = 2(1) + 32 + 4(16)

molar mass of H₂SO₄ = 2 + 32 + 64

molar mass of H₂SO₄ = 98 g/mol

So,

        3H₂SO₄         +         2Al(OH)₃   ----------> Al₂(SO₄)₃ + 6H₂O

    3 mol (98 g/mol)     2 mol (72 g/mol)

         294 g                        144 g

So its clear from the reaction that 294 g of H₂SO₄ react with 144 g of Al(OH)₃

now if we look at the given amounts the amount Al(OH)₃ is less then the amount of H₂SO₄

So, for Al(OH)₃ if we calculate the needed amount of H₂SO₄

So apply unity formula

          294 g H₂SO₄ ≅ 144 g of Al(OH)₃

          X g H₂SO₄ ≅ 0.945 of Al(OH)₃

Do cross multiplication

         X g H₂SO₄ = 294 g x 0.945 g / 144 g

         X g of H₂SO₄ ≅ 1.93 g

So, 1.93 g of H₂SO₄ will react out of 3.24 grams, the remaining amount of it will be in excess.

So,

Al(OH)₃ will be consumed completely an it will be limiting reactant.

-----------

Now to Calculate for the theoretical yield

First we look for the balance reaction

Reaction

          3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

Now we look for the mole mole ration of Al(OH)₃ to the amount of aluminum sulfate produced

So,

              3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

                                 2 mol                     1 mole

from above reaction it is clear that 1 mole of Al₂(SO₄)₃ produce by 2 mole of Al(OH)₃

As we know that

2 mole of Al(OH)₃ = 144 g

So,

if 144 g of Al(OH)₃ gives 1 mole Al₂(SO₄)₃ then how many moles of Al₂(SO₄)₃ will be produces by 0.945 g Al(OH)₃

So apply unity formula

               144 g of Al(OH)₃ ≅ 1 mole of Al₂(SO₄)₃

               0.945 g of Al(OH)₃ ≅ X mole of Al₂(SO₄)₃

Do cross multiplication

             X mole of Al₂(SO₄)₃ = 0.945 g x 1 mole / 144 g

             X mole of Al₂(SO₄)₃ = 0.0066 moles

So,

0.945 g of Al(OH)₃ produce 0.0066 mole of Al₂(SO₄)₃

Now convert moles of Al₂(SO₄)₃ to mass

Formula used:

           mass in grams = no. of moles x molar mass . . . . . . (1)

• molar mass of Al₂(SO₄)₃

molar mass of Al₂(SO₄)₃ = 2(27) + 3(32 +4(16))

molar mass of Al₂(SO₄)₃ = 54 + 3 (32 +64)

molar mass of Al₂(SO₄)₃ = 54 + 3 (96)

molar mass of Al₂(SO₄)₃ = 54 + 288

molar mass of Al₂(SO₄)₃ =342 g/mol

Put values in equation 1

         mass in grams = 0.0066 g x 342 g/mol

         mass in grams = 2.26 g

So the theoretical yield of Aluminum sulfate (Al₂(SO₄)₃ ) is 2.26 g

Answer: transverse wave is a progressive wave whose oscillations are perpendicular to the direction of the wave

Explanation:

Answer:

pattern

Explanation:

Answer:

The answer is a pattern, have a nice day!

Most of an atom's volume is in the nucleus

Answer:

electron

Explanation:

the outer volume of the atom (which means most of the atom) is occupied by electrons. It occupies the space of the atom by constantly whirling around in a kind of orbit around the nucleus.

hope that is ok I tried my best to remember.

Answer:

Explanation:

For the reaction: 2X + 3Y = 3Z, the combination of 2.00 moles of X with 2.00

moles of Y produces 1.75 moles of Z

      2 mol       2 mol   1.75 mol

       2X     +    3Y       =    3Z

need 2 mol  3 mol     to give 3 mol

3 mol Z/3 mol Y=  1 to 1

should get 2 mol Z

1.75/2 =87.5 % yield

87.5 % per cent yield of this reaction when the combination of 2.00 moles of X with 2.0 moles of Y produces 1.75 moles of Z

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

For the reaction: 2X + 3Y = 3Z, the combination of 2.00 moles of X with 2.00 moles of Y produce 1.75 moles of Z.

2 mol    +    2 mol   =  1.75 mol

2X     +    3Y       =    3Z

Need 2 mol  3 mol  to give 3 mol

3 mol Z ÷3 mol Y=  1 ÷ 1

should get 2 mol Z

The per cent yield of this reaction:

1.75 ÷ 2 = 87.5 % yield

Hence, 87.5 % per cent yield of this reaction.

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Answer:

Density = 6.17 * 10^14 g/cm³

Explanation:

Given Parameters

Mass of the proton = 1.0073 amu

Diameter of the proton = 1.75 * 10^-15 m

Required:

Calculate the density of the proton.

Density is calculated using the following formula;

Density = mass / volume

Where mass should be in grams and volume should be in cm ³

Calculating mass of a proton in grams.

Mass = 1.0073 amu

First, we convert to kilogram

Mass = 1.0073 * 1.66054 * 10^-27 kg

Then we convert to grams

Mass = 1.0073 * 1.66054 * 10^-27 * 10³ g

Mass = 1.0073 * 1.66054 * 10^-24 g

Mass = 1.673 * 10^-24 g

Then we calculate the volume of the proton

Volume = 4/3πR³ where R = Radius

And R = ½d.

First calculate the radius in centimetres

R = ½ * 1.73 * 10^-15 m

R = 0.865 * 10^-15

Convert to centimetres

R = 0.865 * 10^-15 * 10² m

R = 0.865 * 10^-13 cm

So, Volume = 4/3 * 3.14 * (0.865 * 10^-13)³

Volume = 4.187 * (0.865 * 10^-13)³

V = 4.187 * 0.865³ * 10^-39

V = 2.71 * 10^-39cm³

So, density = Mass / Volume becomes

Density = 1.673 * 10^-24 g / 2.71 * 10^-39cm³

Density = 0.617 * 10^15 g/cm³

Density = 6.17 * 10^14 g/cm³

Answer:

T(final) = 40.4 °C

Explanation:

Given data:

Density of water = 1.00 g/mL

Volume of water at 25°C = 390.0 mL

Volume of water at 95°C = 110.0 mL

Final temperature of mixture = ?

Solution:

Heat absorbed by warm water = heat lost by hot water

q lost = -q lost ....... (1)

Formula:

q = m.c.ΔT

ΔT(warm) =  T(final) - 25°C

ΔT(hot) =  T(final) - 95°C

Mass of water:

d = m/v

1 g/mL = m/ 390 mL

390 g = m

For hot water:

d = m/v

1 g/mL = m/ 110.0 mL

110.0 g = m

Now we will put the values in equation 1.

390 g. c.   (T(final) - 25°C) =  - 110.0 g .c. (T(final) - 95°C)

390 T(final) - 9750 °C = -110 T(final) + 10450 °C

390 T(final) +110 T(final) = 10450 °C +9750 °C

500 T(final) = 20200

T(final) = 20200/500

T(final) = 40.4 °C

Explanation:

Oxygen

Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O

Explanation:

The equation is now balanced.

2 atoms H in both reactant and product side.

Cl have 2 atoms on both sides.

Ca have 1 atom in both sides.

C have 1 atom on both sides and

O have 3 atoms on both reactant and product side

Answer: When carbon dioxide breaks down into carbon and oxygen, the number of atoms always remains the same.

Explanation: I know this is late but for other people that are trying to find the answer their it is, I hope this helps

The observation which demonstrates the mass conservation is option C. When water breaks down into hydrogen and oxygen, the number of atoms always remains the same.

Conservation of mass is alike the conservation of energy. That is mass can neither be created nor be destroyed. Therefore, the total mass of a system remains constant always.

In a chemical reaction, the total mass in the reactant side is always equal to the total mass in the product side. Hence, no new atoms are created or already existing atoms do not destroy.

In the decomposition of water, the number of atoms in the product side is equal to that in the reactant side. Hence, the total mass of water broken is equal to the total mass of hydrogen and oxygen.

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Your question is incomplete. But your complete question is as follows;

According to the law of conservation of mass, mass is neither created nor destroyed in any ordinary chemical reaction. Which of the following is a demonstration of this law?

When hydrogen and oxygen combine to make water, oxygen atoms are converted to hydrogen atoms.

When sodium and chlorine combine to make salt, some of the sodium is always lost.

When water breaks down into hydrogen and oxygen, the number of atoms always remains the same.

When iron reacts with oxygen to form rust, the mass of the iron atoms increases.

Answer:

              The answer is 167.29 °C

Explanation:

According to Gay-Lussac's Law: The temperature and Pressure of a given gas are directly proportional to each other at given volume and amount.

The formula is as:

                                                 P₁ / T₁  =  P₂ / T₂   -----(1)

In given case:

                       T₁  =  25 °C  =  298.15 K

                       T₂  =  Unknown

                       P₁  =  440 kPa

                       P₂  =  650 kPa

Solving equation 1 for T₂,

                                       T₂  =   P₂ × T₁ / P₁

Putting Values,

                                       T₂  =   650 kPa × 298.15 K / 440 kPa

                                       T₂  =   440.448 K

Or,

                                      T₂  =   167.29 °C                 ∴ °C = K - 273.15

Answer: Number of protons inside the nucleus.

Explanation: The atomic number is indicated by the amount of positively charged particles in the nucleus of an atom and these positively charged subatomic particles are protons.

Bacterial contamination can occur within seconds to minutes, depending on various factors such as the type of bacteria and the environment. The most accurate option among the given choices is 5-10 minutes.

Bacterial contamination can occur very quickly, often within a matter of seconds or minutes. The actual speed of contamination depends on various factors such as the type of bacteria, the environment, and the presence of favorable conditions for bacterial growth. For example, if a person touches a contaminated surface and then touches their mouth or eyes, the bacteria can be introduced to their body almost immediately. Similarly, food left at room temperature for a few minutes can provide enough time for bacteria to multiply and contaminate the food.

Therefore, among the given options, the most accurate answer would be 5-10 minutes as a broad estimate of how quickly bacterial contamination can occur in certain situations.

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The correct answer is c. 10-20 seconds. bacterial contamination can occur in 10-20 seconds.

Bacterial contamination can occur very quickly, especially when proper food handling and hygiene practices are not followed. Cross-contamination between raw and cooked foods, or foods that will not be cooked, such as salads, can happen in a matter of seconds if they come into contact with contaminated surfaces, utensils, or hands. The time frame of 10-20 seconds is consistent with the rapid nature of bacterial transfer.  

To prevent such contamination, it is crucial to maintain cleanliness in food preparation areas, wash hands thoroughly before handling food, and keep raw and cooked foods separate. The other options, 5-10 seconds, 5-10 minutes, and 10-20 minutes, do not accurately represent the speed at which bacterial contamination can occur, with the fastest being within seconds under the right conditions.

Answer:

Energy can transfer (convert) from one form to other.

Explanation:

Law of Conservation of Energy : It states that energy can neither be created nor destroyed in a chemical reaction but can be converted from one from to another.

Potential Energy(P.E) : Energy possessed by the object due to its position and size.Near the ground it attains zero value or close to it.

Kinetic Energy(K.E) : The energy possessed by the object due to its speed .When the object is in motion it has kinetic energy

For example :

When a stone is placed (rest) at some height on the top of the building . It has only potential energy .The potential energy at this point is calculated by

P = mgh

Now , when the the stone is released. It falls to the ground . During its motion towards the ground , its speed increases but the distance of stone from the ground decreases .

Hence the Object in between the ground and building has both K.E and P.E

K.E + P.E = mgh + 1/2 mv^2

If the object reaches just near the ground. Its kinetic energy is maximum but potential energy is almost zero . So at this point ,

K.E = 1/2 mv^2

Hence the Same potential energy is converted into kinetic energy while reaching the ground .

The object itself has not created the energy in between the motion.Neither its energy goes to zero.

Answer:

Mg + AgNO₃ → Ag + Mg(NO₃)₂

Explanation:

A single replacement reaction is one in which an element gets replaced by another in a compound.

In the reaction

Mg + AgC→ Ag + Mg(NO₃)₂

Ag in AgNO₃ is replaced by Mg to give Mg(NO₃)₂.Only one element is getting replaced and hence it is a single replacement reaction.

Answer:

Group 0 the noble gases

Answer: group zero (noble or rare)

Explanation:

Answer:

an increase in the number of protons

Explanation:

As one moves from left to right in the periodic table, the protons steadily increase by one across each period. This increase in number of protons implies an increase in the size of the nuclear charge and a consequent increase in electrostatic attraction between the nucleus and the outermost electron. This increased nuclear attraction leads to an increase in ionization energy across the period.

The increased number of proton increase in ionization energy from left to right across a period.

Ionization Energy:

It is the energy that required to take out one electron from the outer shell of an isolated atom.

When we move from left to right in the periodic table, the number of proton increase but the number of shell remain constant.

This increase the strength of attraction between outer most shell's electron and nucleus.

Therefore, the increased number of proton increase in ionization energy from left to right across a period.

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Explanation:

Number of molecules can be calculated as ratio of given mass to molecular mass x Avogadro's number .

That is ;

Number of molecules = Given mass /molecular mass x Avogadro's number .

Number of molecules = given mass / molecular mass x 6.023 x 10²³

In the above asked question :

The moles of CH₂O = 0.0124 moles

The molecular mass = CH₂O

(atomic mass of C + +atomic mass of hydrogen + atomic mass of O

that is :

12 +1x 2+16=30

Now, substituting in formula, we get

number of molecules = 0.0124mole x Av. number '

Number of molecules = 0.0124 x 6.022 x 10²³

= 0.0746 x 10²³ molecules

Answer:

g silicon = 0.0243 g

Explanation:

∴ atoms silicon = 5.2 E20 atoms

⇒ n Silicon = (5.2 E20 atoms)×(mol/6.022 E23 atoms) = 8.635 E-4 mol silicon

∴ mm silicon = 28.086 g/mol

⇒ g silicon = (8.635 E-4 mol)×(28.086 g/mol) = 0.0243 g

Answer:

2 9/13

Explanation:

First cancel the minus

then convert the Mixed fractions to improper fractions, you have

35/6 divided by 13/6

it becomes 35/6 x 13/6

when you cancel out, you’ll be left with 35/13 which Is 2 9/13

Answer:

63 mL

Explanation:

Data given:

density of CCl₄ = 1.59 g/mL

mass of CCl₄ = 100.0 g

Volume = ?

Solution:

To calculate density formula will be used

        d = m/v

rearrange the above equation

         v = m/d . . . . . . (1)

where

d = density

m = mass

v = volume

put values in above formula 1

            v = 100.0 g / 1.59 g/mL

            v = 63 mL

so. the volume of CCl₄ = 63 mL

The given values:

As we know,

→ [tex]Volume = \frac{Mass}{Density}[/tex]

By substituting the given values, we get

                [tex]= \frac{100.0}{1.59}[/tex]

                [tex]= 63 \ mL[/tex]

Thus the above response is appropriate.

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Answer: 8.28g Na

Explanation: use ideal gas law

PV= nRT

Solve for moles of Cl2

n= PV/ RT

Substitute:

= 1 atm x 4.0 L / 0.08205 L.atm/ mol. K x 273 K

= 0.18 moles Cl2

Do stoichiometry to solve for m of Na

2 Na + Cl2 => 2 NaCl2

=0.18 moles Cl2 x 2 mol Na/ 1 mol Cl2 x 23g Na / 1 mol Na

= 8.28 g Na.

To react with 14.0 grams of octane, 48.9 grams of oxygen are required in the combustion of octane in gasoline.

To balance the chemical equation C8H18(g) + O2(g) → CO2(g) + H2O(g), you need to ensure that the number of atoms of each element is equal on both sides of the equation. The balanced equation is:

C8H18(g) + 12.5O2(g) → 8CO2(g) + 9H2O(g)

To determine the mass of oxygen required to react with 14.0 grams of octane, you need to use stoichiometry. From the balanced equation, you can see that the mole ratio between octane and oxygen is 1:12.5. First, convert the mass of octane to moles by dividing it by its molar mass. Then, use the mole ratio to find the moles of oxygen. Finally, multiply the moles of oxygen by its molar mass to find the mass of oxygen:

14.0g C8H18 ÷ 114.22g/mol C8H18 = 0.1223 mol C8H18

0.1223 mol C8H18 × 12.5 mol O2 ÷ 1 mol C8H18 = 1.5288 mol O2

1.5288 mol O2 × 31.998 g/mol O2 = 48.9 grams of oxygen

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Answer:2kg

Explanation:

Mass =?

Acceleration = 3.0 m/s2

Force = 6.0N

Force = Mass x Acceleration

6 = Mass x 3

Mass =6/3 = 2Kg

Answer:

temperature

Explanation:

because of different temperature point.

Answer:1. Energy 2. Medium 3. Original position 4. Waves 5. Matter

Explanation:

8.3mL

Explanation:

Given parameters:

Mass of acetone = 6.54g

Density of acetone = 0.7857 g/mL

Unknown:

Volume of acetone = ?

Solution:

Density is defined as the mass per unit volume of a substance. It is expressed mathematically as shown below:

  Density = [tex]\frac{Mass}{Volume}[/tex]

Since the unknown is volume, we make it the subject of the formula

Volume =  [tex]\frac{mass}{density}[/tex]

Input the values;

  Volume = [tex]\frac{6.54}{0.7857}[/tex] = 8.3mL

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