Chemical Reactions
Substances in a fire extinguisher help prevent air from reaching a burning material. Why would this be a good way to fight a fire?

Answer:

pH is a measure of how acidic/basic water is. The range goes from 0 to 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.

Explanation:

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From the calculations and the data provided in the question, the required temperature is 380 K.

The Clasius Clapeyron equation is used to obtain the vapor pressure of a substance at two different temperatures.

Hence;

lnP2/P1 = -ΔHvap/R(1/T2 - 1/T1)

ln(145/1) = -40.7 * 10^3/8.314(1/T2 - 1/273)

4.977 = -(4811)(1/T2 - 1/273)

4.977/-(4811) = (1/T2 - 1/273)

-0.00103 = 1/T2 - 1/273

-0.00103 +  1/273 =  1/T2

0.002633 =1/T2

T2 = 380 K

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Taking into account the reaction stoichiometry, 7 moles of water will be produced if 3.5 moles of sulfuric acid reacts.

In first place, the balanced reaction is:

H₂SO4 + 2 NH₂OH → 2 H₂O + (NH₄)₂SO₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied: If by stoichiometry of the reaction 1 mole of sulfuric acid produces 2 moles of water, 3.5 moles of sulfuric acid produces how many moles of water?

[tex]moles of water=\frac{3.5 moles of sulfuric acidx2 moles of water}{1 mole of sulfuric acid}[/tex]

moles of water= 7 moles

Then, 7 moles of water will be produced if 3.5 moles of sulfuric acid reacts.

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Answer:What type of compound is Magnesium bromide?

Magnesium bromide (MgBr2) is a chemical compound of magnesium and bromine that is white and deliquescent. It is often used as a mild sedative and as an anticonvulsant for treatment of nervous disorders. It is water-soluble and somewhat soluble in alcohol.

Explanation:

1) The statement "A fire burns down a house" best describes how energy can be harmful.  Option (A) is correct.

2) Among the four boxes, Box D has the highest mass of 700 grams. Option (D) is correct.

3) Among the given boxes, Box C is the one with a mass of 50 grams.

Option (B) is correct.

1) In this scenario, the energy in the form of heat from the fire is released uncontrollably, leading to the destruction of the house. Fire represents a potentially dangerous and destructive form of energy when it is not properly contained or controlled. It illustrates how energy, when harnessed inappropriately or unintentionally, can have harmful consequences, causing damage to property and posing a risk to human safety.

2) This means Box D is the heaviest compared to the other boxes labeled A, B, and C. The mass of each box is shown in the diagram, with Box A weighing 550 grams, Box B 5 grams, and Box C 50 grams. Box D, with 700 grams, has the most significant mass, making it the heaviest box in the set.

3) Since the question asks which box is "under" the box with a mass of 50 grams, we can refer to the diagram and see that Box C is positioned above Box D and Box B. Therefore, the only box that is under Box C is Box A. So, the answer is Box A, as it is positioned below Box C in the diagram.

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The complete question is:

1. Which statement best describes how energy can be harmful?

A A fire burns down a house.

B Electricity heats an oven.

C A lamp lights a house.

D An alarm clock wakes up a sleeping person.

2. The diagram below shows four boxes labeled A, B, C, and D. The mass of

each box is shown.

a) 550 grams

b) 5 grams

c) 50 grams

d) 700 grams

3. Which box is under the box with a mass of 50 grams?

a) box A

b) box B

c) box C

d) box D

Answer:

poisoning, breathing problems, skin rashes, allergic reactions, allergic sensitisation, cancer, and other health problems from exposure.

Explanation:

many hazardous chemicals are also classified as dangerous goods.

Answer:

D all

Explanation:

because law of conservation of mass describes A, B and C statement

Answer:

try youre best to succsess

Answer:

C

Explanation:

Answer: i don't know what you mean by control  but if you mean what will happen is the balloon if he rubs it on his head and not his clothes electrons move from the atoms and molecules in his hair onto the balloon and since electrons have a negative charge the balloon will become negatively charged and his hair will become positively charged.

Answer: the ballon that was not rubbed with cloth

Explanation:

Answer:

Form  covalent bond

Explanation:

If their electronegativity is same or very close they will likely form covalent bond (where they share electrons)

Answer:

The answer would be B, PC13

Explanation:

Answer:

B: PC13

Explanation:

Enthalpy change is the heat that evolved or got absorbed in a reaction mixture. The enthalpy change for the reaction is -137 kJ.

Hess's law states that the enthalpy for the whole reaction will be equal to the summation of all changes that are independent of the steps of the reaction.

First, arrange all the reactions and balance them, first the data of equation 1 is rearranged:

NO₂ must be on the reactant side and must be multiplied by 3/2 so that 3 moles of NO are balanced.

3 NO₂ (g) → 3 NO (g) + 3/2 O₂ (g),    ΔH = + 174 kJ

Now, for equation 2: the moles of HNO₃ required is 2 so the whole equation will be divided by 2 as,

N₂ (g) + 5/2 O₂ (g) + H₂O (l) → 2HNO₃ (aq),      Δ H = -128 kJ

Now, for equation 3: N₂ and O₂ should be eliminated and reversed as,

2NO (g) → N₂(g) + O₂(g)    ΔH = -183 kJ

Now, to determine the enthalpy the rearranged equation 1, 2, and 3 are added to get the final equation:

3NO₂ (g) + H₂O (l) → 2HNO₃ (aq) + NO (g)

Δ H = 174 - 128 - 183

= -137 kJ

Therefore, -137 kJ is the enthalpy change.

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CGA UUC are the strands of mRNA that would be produced from the strand of DNA shown. Therefore, the correct option is option C.

Deoxyribonucleic acid, or DNA, is an organic molecule with a complex molecular structure which is present in all cells, both prokaryotic and eukaryotic, as well as in a variety of viruses. For the transfer of inherited traits, DNA codes genetic information. The discovery significantly improved scientists' knowledge of DNA replication including the genetic regulation of biological processes.

Despite the fact that the molecule DNA was initially identified in 1869, its significance for the transmission of genes was not demonstrated till 1943. James Watson with Francis Crick discovered that the molecular makeup of DNA consists of a double-helix polymers, a spiral made up of two DNA strands twisted around one another, in 1953 with the help of biophysicists Rosa Lind Franklin with Maurice Wilkins. CGA UUC are the strands of mRNA that would be produced from the strand of DNA shown.

Therefore, the correct option is option C.

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Answer:

Running to catch the bus would be it

Explanation:

because you're running for the others you barly move

Answer:

For 1hour whole milk feed = (60,000 /6 )Kg=10,000Kg

So that the flow rate of whole milk feed = 10,000 kg/hr

Mass of whole milk=10,000 kg

Mass of cream = x kg Mass of skim milk=(1-x) Mass balance equation is Whole milk= skim milk + cream 10,000kg=skim milk + x kg So, skim milk = (10,000-x) kg Material balance on fat is 10,000kg×0.04 = (10,000-x)×0.004 + x On solving the above equation we get the value of x So, x=361.44 kg So that the flow rate of cream = x= 361.44kg/hr and mass of skim milk= (10,000-x)=(10,000-361.44)kg = 9,638.56 kg So that the flow rate of skim milk = 9,638.56 kg/hr. for checking

(Whole milk) flow rate = (skim milk + cream) flow rate

10,000 kg/hr = (9,638.56 + 361.44) kg/hr 10,000 kg/hr = 10,000 kg/hr Hence it is proved.

Answer:

1. 36.5g                 2. 103.3g

3. 140g                   4. 151g

5. 159g

Explanation:

1. HCl

atomic mass of H= 1g

atomic mass of Cl = 35.5g

solution:

       HCl

     = 1+ 35.5

      = 36.5g

2. ZnF2

atomic mass of Zn = 65.3g

atomic mass of F = 19g

solution:

                ZnF2

               = 65.3 + 2(19)

                =65.3 + 38

                = 103.3 g

3. K2CO3

 atomic mass of K= 40g

atomic mass of C = 12g

atomic mass of O = 16g

Solution:

               K2CO3

               = 2(40) + 12 + 3 (16)

                = 80 + 12 + 48

                 = 140g

4. FePO4

  atomic mass of Fe = 56g

  atomic mass of P= 31 g

  atomic mass of O = 16g

solution:

              FePO4

              = 56 + 31 + 4 (16)

              = 56 + 31 + 64

               = 151g

5. Cu2S

atomic mass of  Cu = 63.5g

atomic mass of S = 32 g

solution

       Cu2S

       = 2(63.5 )+ 32

        = 127 + 32

         =159g

Answer:

yes

Explanation:

sedimentary rocks are erosion, weathering, dissolution, precipitation, and lithification

Sedimentary Rocks are layers of deposited dust,smaller rocks & particles. This means that yes Sedimentary rocks are formed from weathering,erosion & deposition.

I HOPE THIS HELPS <3 and good luck!

Answer:

See below

Explanation:

PV = n RT        R = .082057  L - Atm / (K-Mole)

.97 V = .118 (.082057)(305)    

    V = 3.04 liters

Will not change for argon.....will be the same for all ideal gases

[OH⁻] = 0.158 x 10 ⁻⁷ M is the concentration of OH- of a solution with an H3O⁺ concentration equal to 6.31  x 10 ⁻⁷ M.

The letters pH stand for the power of the hydrogen ion. The pH of a solution is the negative logarithm of the hydrogen-ion concentration.

pH = - [log H⁺]

[tex]\rm [H^{+}] [OH^{-}] = 1 \times 10^{-14}[/tex]

[tex]\rm[OH^{-}] = \dfrac{1 \times 10^{-14} }{ [H^{+}] }[/tex]

[tex]\rm[OH^{-}] = \dfrac{1 \times 10^{-14} }{ 6.31 \times 10^{-7} }[/tex]

[OH⁻] = 0.158 x 10 ⁻⁷ M

Therefore [OH⁻] = 0.158 x 10 ⁻⁷ M is the concentration of OH- of a solution with an H3O+ concentration equal to 6.31  x 10 ⁻⁷ M.

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Answer:

The position of the moon during its orbit around Earth.

Explanation:

Answer:

youre gonna have to include the answers for me to help

Explanation:

Answer:

Anstree species was preserved as a fossil in the Arizona desert. The species is now extinct. its because we preserved it right so that mean even to it fell down its still alive for the simple reason that we dint ruin it

Answer: 2

Explanation: Calcium has a +2 charge and PO4 has a -1 charge. When writing this expression, the charges are flipped; instead of Ca2(PO4), it's Ca(PO4)2.

Answer:

Weather maps im sorry im not sure but i think its the answer

The required temperature of the sample of gas is 823K.

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

PV = nRT, where

Moles will be calculated as:
n = W/M, where

Moles of Neon gas = 1g / 20.1g/mol = 0.049 mole

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

T = (0.657)(5.01) / (0.049)(0.082) = 822.8 = 823 K

Hence required temperature of the sample is 823 K.

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Answer:

A stir bar consists of a magnetic bar used to agitate a liquid mixture or solution

Explanation: