Identify the combustion reaction.
a) Al 2S 3 — 2A1 + 35

b) 2H 2 + O2 – 2H 20
c) C12 + 2KBr — 2KCI + Br2
d) C4H 12 + 70 2 - 6H 20 + 4CO 2

Full gas bottles, when involved in a fire, can experience a dangerous rise in internal pressure leading to potential explosions. Bottled gas is heavier than air and collects on the floor, creating significant fire hazards if it leaks. Proper storage and safety measures including seismic shut-off valves can help mitigate these risks.

Gas bottles, such as those containing propane or butane, are stored at high pressure typically around 200 atmospheres. These bottles have a safety factor where they are designed not to fail until reaching pressures around 400 atmospheres. However, if a fire exposes the gas bottle to high temperatures, the pressure inside the bottle will increase significantly. If the heat from the fire causes the internal pressure to exceed the safety limit of the bottle, it might no longer be able to contain the gas leading to a potential explosion or rupture.

Furthermore, gas bottles such as those containing propane or butane are denser than air. In the event of a leak, the gas would collect near the ground creating a severe fire hazard as it might be ignited by any nearby source of flame or heat. This is why warnings such as those on hairspray cans caution against exposure to heat or open flames, to prevent the dangerous increase in pressure and the risk of explosion or fire.

Additionally, during natural disasters like earthquakes, improperly secured gas tanks might be disturbed, causing leaks that can lead to fires. Installing seismic shut-off valves and flexible connections can mitigate this risk significantly.

Answer:

If a gas has experienced a small increase in volume but has maintained the same pressure and number of moles, the temperature of the gas will DROP.

Explanation:

According to Boyle’s law of ideal gases, volume and temperature of a gas is inversely related, as long as the pressure is kept constant;

P₁V₁/T₁ = P₂V₂/T₂

Therefore, if the volume of the gas increases, the temperature will definitely decrease due to the inverse relationship. The gas will get cooler.  

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Answer:

Choices:

A. It has increased two times.

B. It has increased slightly.

C. It has decreased slightly.

D. It has stayed the same.

Explanation:

The correct answer is B. Edge2021

Answer:

Mass of CO₂ = 135.96 g

Mass of  TiCl₄ = 586.11 g

Mass of chlorine = 438.78 g

Explanation:

Given data:

Moles of TiO₂ = 3.09 mol

Mass of Chlorine = ?

Mass of all product from 3.09 mol of TiO₂ = ?

Solution:

Chemical equation:

TiO₂ +C + 2Cl₂  →  TiCl₄ + CO₂

Now we will compare the moles of chlorine with TiO₂.

                                TiO₂        :       Cl₂

                                   1            ;        2

                                   3.09     :        2×3.09 = 6.18 mol

Mass of chlorine:

Mass = number of moles × molar mass

Mass = 6.18 mol × 71 g/mol

Mass = 438.78 g

Now we will compare the moles of   TiCl₄ and CO₂ with TiO₂

                                  TiO₂           :          CO₂

                                      1              :            1

                                     3.09         :         3.09

                                     TiO₂         :          TiCl₄

                                         1            :              1

                                      3.09        :            3.09

Mass of CO₂:

Mass = number of moles × molar mass

Mass = 3.09 mol× 44 g/mol

Mass = 135.96 g

Mass of  TiCl₄:

Mass = number of moles × molar mass

Mass = 3.09 mol× 189.68 g/mol

Mass = 586.11 g

Answer:

the answer is, colliding hydrogen atoms to produce heavier helium atoms.

Answer:

10 electrons

Explanation:

Answer:

The answer is: 10 electrons

Explanation:

A clear prediction of the anticipated results in an experimental design is known as "Hypothesis".

Explanation:

A theory or hypothesis are often used clearly as a suggested event descriptive one. The scientific methods need that one can be able to examine for a hypothesis termed as scientific hypothesis.

A working in hypothesis is a proposed provisionally accepted hypothesis for on-going research that starts with an appropriate amount of conclusion and thoughts, also known as "Educated Guess".

According to researchers like Schick and Vaughn the weighing up an alternative hypotheses might be taken into understanding like Parsimony, testability, Fruitfulness, Scope and Conservatism.

Answer:

Because of its malleability.

Explanation:

Magnesium is alkaline earth metal.

It is present in second group.

It is shiny gray color metal.

It is lighter but strong.

Its density is 1.738 g/mL.

It is soft and can be malleable. Magnesium ribbons are also formed by stretching the magnesium metal and this is due to the malleability of magnesium.

Magnesium ribbon burns and produces heat.

It is used to make the many light weight products such as many parts of car,  phone, laptop, luggage etc.

It is also used to remove the sulfur such as from iron and steel.

It is also used in fireworks.

It is also used in medicine such as for constipation.

It is used as antiacid for heart burn.

Answer:

Na+ e- - Na

Explanation:

Explanation:

mass of an object affect the density and object if the the volume is keep constant.

here we can explain by using the example.

if the mass of an object is 30kg. and volume is 2m3

then density pf given substance is become 15kg/m3

again,

if the mass of the is 40kg/m3 and volume is same

then density is become 20kg/m3 (formula=kg/m3)

here above density and below density is becime different by changing the mass of an object and affect the density and objecy although volume is kept constant or same

Answer: An increase in mass will increase the density

A decrease in mass will decrease the density

Explanation: So any changes in the mass of the object will affect its density even with constant volume. Mass is directly proportional to density. So when mass is increased density will increase as well and vice versa.

Answer:

B. To ask and answer scientific questions

To ask and answer scientific questions is the job of a scientist. Therefore, the correct option is option B.

The systematic examination of natural events through theoretical analysis and experimental is referred to as scientific research. Its main goal is to increase our knowledge of and comprehension of numerous scientific disciplines as well as our understanding of the world around us. A hypothesis is a put forth explanation for a phenomenon based on prior information or observation that serves as the starting point for scientific inquiry. Then, using a series of carefully planned tests or observations, this hypothesis is verified.

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Answer :the electrolytes conduct electricity due to movement of ions (cations and anions), while the conductors conduct electricity due to movement of electrons only.

Explanation:

Answer:

ivy growing around the pole of a fence

Explanation:

Explanation:

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  =  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 = 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 conver 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 =  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

The tail of a comet is on the opposite side of the comet from the sun, due to the influence of the sun's radiation pressure and solar wind.

The tail of the comet is on the opposite side of the comet from the sun. This happens because the sun's radiation pressure and solar wind push material away from the comet's nucleus, forming a tail that points away from the sun, regardless of the direction the comet is moving. Therefore, the tail of the comet always lies opposite to the direction of the sun.

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Answer:

A proton has positive charge of 1, that is, equal but opposite to the charge of an electron. A neutron, like the name implies, is neutral with no net charge. The charge is believed to be from the charge of the quarks that make up the nucleons (protons and neutrons). need a pictur of the question

Explanation:

Answer:

Both are endothermic reactions.

Explanation:

Chemical equation:

1/2H₂(g) + 1/2I₂(g)  →  HI(g)  + 6.2 kcal/mol

Chemical equation:

21.0 kcal/mol + C(s) + 2S(s)  → CS₂

Both reaction are endothermic because heat is added in both of reactions.

Endothermic reactions:

The type of reactions in which energy is absorbed are called endothermic reactions.

In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.

For example:

C + H₂O   →  CO  + H₂

ΔH = +131 kj/mol

it can be written as,

C +  H₂O  + 131 kj/mol  →  CO  + H₂

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

Answer:  

I had to do some research, because I not familiar with Hess's Law.

Hope this helps :)

Stating Hess's Law

Hess's Law is the most important law in this part of chemistry. Most calculations follow from it. It says "The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs."

Explaining Hess's Law

Hess's Law is saying that if you convert reactants A into products B, the overall enthalpy change will be exactly the same whether you do it in one step or two steps or however many steps.

Answer:

Hess's Law of Constant Heat Summation (Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

Explanation:This law is a manifestation that enthalpy is a state function.

Answer:

Two physical systems are in thermal equilibrium if there is no net flow of heat between them.

Explanation:

Two Physical systems are said to be in thermal equilibrium if there is no net flow of heat energy between them when they are connected and both of the system is at the same temperature.

Thermal equilibrium is of two varieties i.e Two thermally connected bodies and Internal thermal equilibrium.

If two bodies are thermally connected to each other then there will only transfer of the heat to maintain equilibrium but no transfer of the matter and mass.

Also, a internal thermal equilibrium is maintained in a isolated body where there is no transfer of the heat from the body outside or inside of it.

Thermal equilibrium follows zeroth law of thermodynamics which says that Two bodies are in thermal equilibrium with each other if they individually are in thermal equilibrium with a third body.

Explanation:

given

mass =85*1000=85000kg

volume=850/100*100*100m3

now,

density=mass / volume

=85000kg/850000000m3

=1/10000kg/m3

=0.0001kg/m3

the density of the rock is 0.0001kg/m3.

Answer:

                    0.412 Kg of Solution

Explanation:

                    To solve this problem we will first find the number of grams of solute contained by the given amount of solution as,

                      w/w%  =  weight of solute / weight of solution × 100

Solving for weight of solute,

                      Weight of solute = w/w% × weight of solution / 100

Putting values,

                      Weight of solute = 10.9 × 500 g / 100

                       Weight of solute = 54.5 g

Hence,

                  54.5 g of solute was contained by  =  500 g of solution

So,

               45.0 g of solute will be contained by  =  X g of solution

Solving for X,

                     X =  45.0 g × 500 g / 54.5 g

                      X =  412.84 g

Or,

                     X  =  0.412 Kg of Solution

Final answer:

To obtain 45.00g of 4-methyl-2-pentanone from a 10.9% w/w solution, the student should measure out 412.84g of the solution.

Explanation:

To calculate the mass of the solution the student should use to get 45.00g of 4-methyl-2-pentanone from a 10.9% w/w solution, we first need to understand what a w/w solution means. It indicates that for every 100g of solution, there is 10.9g of the solute (4-methyl-2-pentanone). To find the mass of the solution needed for 45.00g of the solute, the following calculation should be performed:

Mass of solute (desired) = % w/w × mass of solution
Therefore, mass of solution = Mass of solute (desired) / % w/w

So:

Mass of solution = 45.00g / 0.109 = 412.84g

The student should therefore measure out 412.84g of the 10.9% solution to obtain 45.00g of 4-methyl-2-pentanone.

Answer:

the temperature difference between the water and the ice cubes causes heat to be transferred from the water to the ice cubes,.

Explanation:

Heat always travels to where it is colder. Think about how ice cubes melt. They are very cold so the heat is transferred to them from he warmer water and they melt.

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Answer:

temperature hear

Explanation:

Answer:

0.1 mol

Explanation:

Number of mole= mass/molar mass

lithium have a mass number of 7 and oxygen have a mass number of 16.

so, (7x2) + 16

= 30

therefore, number of moles = 2.93/30

= 0.10

Answer:

Mass of Li2O = 2.93g

Molecular mass of Li2O = 29.88g/mol

No of mole of Li2O = Mass/Molar mass

No of mole of Li2O = 2.93/29.88

No of mole of Li2O = 0.0981mol

Answer:

It increased the avaiability of food for humans

Explanation:

Answer:

The sodium atom becomes a positive ion and the chlorine atom becomes neg.

Explanation:

Think about this answer

Answer:

2.95 [tex]\times 10^{-9}[/tex] is the fraction of the nucleus is present in atom.

Explanation:

Given:

The diameter of the nucleus - 10A

The diameter of atom - 1.5 A

From this, we can find the radius of nucleus and atom i.e.

For nucleus [tex]=\frac{10}{2}[/tex]

For atom [tex]= \frac{1.5}{2}[/tex]

Now, the fraction of nucleus [tex]= \frac{volume of nucleus}{volume of atom}[/tex]

                                               = [tex]\frac{4}{3}\pi (\frac{10}{2})\frac{3.14}{2}\pi (\frac{10}{2})^3[/tex]

  or,                                         = [tex](\frac{10}{1.5})^3[/tex]

                                               = 2.95 [tex]\times 10^{-9}[/tex]

Therefore, 2.95 [tex]\times 10^{-9}[/tex] is the fraction of nucleus in the atom.

The volume of a nucleus is found by the formula for the volume of a sphere. Given the diameters specified, the nucleus occupies a very small fraction, specifically one trillionth, of the total atomic volume. Hence, atoms are mostly comprised of empty space.

Both an atom and its nucleus are approximately spherical in shape. To calculate the volume of each, we can use the formula for the volume of a sphere, which is 4/3π*r3.

Hence, the volume fraction of the atom taken up by the nucleus would be the ratio of the volume of the nucleus to the volume of the atom.

The volume of the nucleus (Vn) is 4/3π*(101 A)3 = 4,188.79 cubic A.

The volume of the atom (Va) is 4/3π*(105 A)3 = 4.18*1015 cubic A.

Finally, the volume fraction of the atom taken up by the nucleus is

Vn/ Va = 4,188.79 / 4.18*1015 = 1*10-12 or one trillionth.

So, the nucleus occupies a very small proportion of the total atomic volume. This explains why atoms are mostly empty space.

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Answer:

Sodium hydroxide has the formula NaOH and it contains three atoms, one each of Sodium, Hydrogen and Oxygen.

Explanation:

Answer: 1.806 x 10^24 atoms

Explanation:Please see attachment for explanation

Answer:

Net ionic equation:

Ba²⁺(aq) + SO₄²⁻(aq)  →   BaSO₄(s)

Explanation:

Chemical equation:

BaCl₂ +  Na₂SO₄   →   BaSO₄ + NaCl

Balanced Chemical equation:

BaCl₂(aq) +  Na₂SO₄(aq)   →   BaSO₄(s) + 2NaCl(aq)

Ionic equation:

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq)  →  BaSO₄(s)+ 2Na⁺(aq) + 2Cl⁻ (aq)

Net ionic equation:

Ba²⁺(aq) + SO₄²⁻(aq)  →   BaSO₄(s)

The Cl⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The BaSO₄ can not be splitted into ions because it is present in solid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Answer

The mole ratio is 1:1

The molar mass of potassium hydrogen phthalate (C8H5KO4) is 204.22g/mol

The mass of C8H5KO4 is 0.43g

The no of moles of C8H5KO4 = mass/molar mass

No of Moles of C8H5KO4 = 0.000210557242mol

From Mole ratio the no of mole of NaOH that reacted with C8H5KO4 0.000210557242

Therefore, molaroty of NaOH is mole of NaOH/the Volume in L

Molaroty if NaOH = 0.000210557242/0.02411 = 0.08733M