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Class 7​

The pressure of hydrogen gas formed  is 720.8 mmHg.

The pressure exerted by a (specified) component in a mixture of gases.

We have to understand one thing that the Hydrogen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components.

The vapor pressure of water at that temperature is approximately

19.231 mmHg.

This means that

[tex]\rm P_{total} = P_{hydrogen} + \; P_{water vapor}[/tex]

740 = [tex]\rm P_{hydrogen}[/tex] + 19.231

[tex]\rm P_{hydrogen}[/tex] = 740-19.231

[tex]\rm P_{hydrogen}[/tex] = 720.8 mmHg

Therefore the pressure of hydrogen gas formed  is 720.8 mmHg.

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Fire is a risk in all commercial kitchens. Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires.

What is an accidental fire?

Accidental fires are those in which the proven cause does not involve any deliberate human act to ignite or spread the fire.

Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires. Employers must implement effective administrative controls to protect employees and the business from the dangers of fire.

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The lowest temperature that would cause a red blood cell within the human body experience apoptosis is 338K.

Aposptosis is the death of cells in the am organisms which occur as a result of death in cellular processes or steps resulting in the death of a cells could be as a result of high temperature.

Therefore, The lowest temperature that would cause a red blood cell within the human body experience apoptosis is 338K.

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Answer:

read it first

Explanation:

Population change is governed by the balance between birth rates and death rates. If the birth rate stays the same and the death rate decreases, then population numbers will grow. If the birth rate increases and the death rate stays the same, then population will also grow.

hope it helps

To completely convert 9. 0 moles of hydrogen gas (h2) to ammonia gas, 3.0 moles of nitrogen gas (n2) are required.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

The given reaction is [tex]\rm N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)[/tex]

By the stoichiometry rule of ratio hydrogen: nitrogen

3 : 1

The reacted moles of nitrogen is equals to H/3 moles of reacted hydrogen

So, moles of nitrogen  

[tex]\rm Moles\; of\; nitrogen = \dfrac{9.0 }{3} =3.0\;mol[/tex]

Thus, 3.0 moles of nitrogen gas (n2) are required.

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The volume of a gas at STP is 45.6L in the given conditions.

This is an example of a combined gas law equation.

P₁V₁/T₁=P₂V₂/T₂

V₂=V₁×P₁/P₂×T₂/T₁

Convert STP in bar

P₁=1atm=1.013 bar, V₁=50L, T₁=303K, P₂=1bar, V₂=?, T₂=273K

V₂=50×1.013/1×273/303

V2=45.6L

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Answer:

C

Explanation:

These particles are attracted to the ground with opposite charges that they form lightning (That's the best way I could explain it )

Answer:

c. charged particles colliding with earth’s magnetic field

Explanation:

Lightning is caused by

charged particles colliding with earth’s magnetic field

its not ,b or a, nor ,c &,d

Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves. Most lightning occurs within the clouds. What causes lightning?

So, do thunderclouds have rubber shoes? Not exactly, but there is a lot of shuffling going on inside the cloud and there's alot on the lighting that tower .

The oxidation reaction is the chemical reaction in which the species loses electrons. The five oxidized ethanedioic acid molecules will produce 8 water molecules. Thus, option B is correct.

Half reaction equations are the representation of the reduction and the oxidation half of the whole reaction that denotes the gaining and losing of electrons differently.

The oxidation half of the reaction is given as:

HO₂CCO₂H → 2CO₂ + 2H⁺ + 2e⁻

The reduction half of the reaction will be given as:

MnO₄ + H⁺ → Mn²⁺ + H₂O

The overall reaction is written as:

C₂O₄ ⁻² + MnO₄⁻ + H⁺ →  CO₂ + H₂O + Mn²⁺

Here electrons are lost in the formation of carbon dioxide and electrons are gained when manganese is produced.

The total reaction is given as:

5 C₂O₄ ²⁻ + 2MnO₄ ⁻ + 16H⁺ → 10CO₂ + 8 H₂O + 2 Mn²⁺

Therefore, option B. five ethanedioic acid molecules produce 8 water molecules.

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Molality is the ratio of the moles of the solute and the mass of the solvent. The molality of the solute is 7.38 m.

Molality is the moles of the solute present in a kilogram of the solvent in a solution of the substance.

Given,

Percent by mass = 25.5 %

In 100 gm of solution = 25.5 gm of  formic acid

Mass of solution = 100 gm

Mass of solute = 25.5 gm

Mass of solvent = 74.5 gm

Moles of solute are calculated as:

[tex]\dfrac{25.5}{46} = 0.55 \;\rm moles[/tex]

Moles of solvent are calculated as:

[tex]\dfrac{74.5}{18} = 4.13\;\rm moles[/tex]

Molality is calculated as:

[tex]\begin{aligned} \rm Molality &= \rm \dfrac{moles}{\text{mass in kg}}\\\\&= \dfrac{0.55}{0.0745}\\\\&= 7.38 \;\rm m\end{aligned}[/tex]

Therefore, 7.38 m is the molality of the solute.

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Answer:

2.05 i think sorry if im wrong

Explanation:

Answer: A. There will be fewer producers in that area.

Explanation: Answer A is correct because all plants, including grass, is a producer. Since there is an increase in grass eating animals (Antelope), more grass will be consumed, decreasing the amount of grass aka producer.

Answer:

The correct answer is 547

[tex]\huge\tt\fbox\pink{Activation \: energy}[/tex]

Due to its position, an object has the ability to store energy. For instance, when a demolition machine's heavy ball is held in an elevated position, it is storing energy.

Potential energy is the name for this positional energy that has been stored. Similar to how a drawn bow can store energy due to its posture. There is no energy in the bow while it is in its normal position, or when not drawn.

The bow can yet store energy when its position is changed from its normal equilibrium position because of its position.

Potential energy is the name for this positional energy that has been stored. Potential energy is the energy of position that a thing has stored inside it.

Therefore, Due to its position, an object has the ability to store energy. For instance, when a demolition machine's heavy ball is held in an elevated position, it is storing energy.

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Answer:

1CO + 2H₂ —> 1CH3OH

Explanation:

When balancing any chemical equation given, you identify the amount of reactants and amount of products.

From our given equation;

__CO +__ H₂ —> __CH3OH

Reactants

C = 1

O = 1

H = 2

Products

C = 1

O = 1

H = 3 + 1 = 4

This shows that Hydrogen is not balanced we require 2 to balance it. Thus giving us;

1CO + 2H₂ —> 1CH3OH,

Which is balanced.

if pressure is increased, equilibrium will shift toward the side that has the last amount of moles in order to alleviate the sudden change and bring the pressure back down.

Answer:

280 kPa

Explanation:

P1V1 = P2V2

140 * 2.5 =  P2 * 1.25

P2 = 280 kPa

The question is not found here but the results of a lab experiment can be used to draw discussions and conclusions.

An experimental procedure in the lab refers to the process to validate (or reject) our working hypothesis from a given question of the natural world.

Within the laboratory, we need to collect data through experimental procedures that help us as evidence to answer the hypothesis.

In conclusion, the question is not found but the results of a lab experiment can be used to draw discussions and conclusions.

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Answer:

4.14 x 10²⁴ molecules CO₂

Explanation:

2 C₄H₁₀ + 13 O₂ --> 8 CO₂ + 10 H₂O

To find the number of CO₂ molecules, you need to start with 100 grams of butane (C₄H₁₀), convert to moles (using the molar mass), convert to moles of CO₂ (using coefficients from equation), then convert to molecules (using Avagadro's number). The molar mass of C₄H₁₀ is calculated using the quantity of each element (subscript) multiplied by the number on the periodic table. The ratios should be arranged in a way that allows for units to be cancelled.

4(12.011g/mol) + 10(1.008 g/mol) = 58.124 g/mol C₄H₁₀

100 grams C₄H₁₀          1 mol C₄H₁₀             8 mol CO₂          
--------------------------  x  ----------------------  x  ---------------------  
                                        58.124 g              2 mol C₄H₁₀          

    6.022 x 10²³ molecules
x  ------------------------------------  =  4.14 x 10²⁴ molecules CO₂
              1 mol CO₂

If the digestive system breaks down you would have no ability to get the nutrients.

The digestive system includes the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.

If you had no digestive system, you would have no ability to get the nutrients and sugars in food, and you would die.

The digestive system is very long, however. Some people have gotten into car accidents and damaged their intestines, and had to have part of them removed.

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Answer:moles or atom. The SI base unit for amount of substance is the mole. 1 mole is equal to 6.0221415E+23 atom. Note that rounding errors may occur, so always check the results.

Explanation:

Answer:

When a substance is added into a solution then its color will change with different kind of solution then such type of substance can be considered as indicator. . They can be synthetic as well as an olfactory indicator

Explanation:

Hope this helps!!!!!!!!

Be safe!!!!!!!!

Answer:

c. a small amount

Explanation:

Trace elements (or trace metals) are minerals present in living tissues in small amounts.

Answer:

2.25 M     <========= I do not see this in your selection of answers !

Explanation:

Mole weight of  Li F

      ( from periodic table ) = 6.94 + 18.998  = 25.938 gm/mole

56 gm / ( 25.938 gm /mole) = 2.15899 moles

2.15899 mole / (.959) L = 2.25 M

The equilibrium constant equation for the reaction of ammonia , a weak base, with water is K=[NH₄⁺][OH⁻] / [NH₃].

Equilibrium constant is a number that expresses the connection between the quantity of products and reactants present at equilibrium in a reversible chemical reaction.

Given chemical reaction is:

NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)

Equilibrium constant equation for the above reaction will be represent as:

K = [NH₄⁺][OH⁻] / [NH₃]

As value of pure water is 1 for the above equation.

Hence equilibrium constant equation for the reaction of ammonia is K=[NH₄⁺][OH⁻] / [NH₃].

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Answer:

v1=35,679.7 ml

Explanation:

p1v1/t1=p2v2/t2

v1=t1p2v2/p1t2

v1=672.44*442.6*7650ml/267.86*239.18

v1=35,679.7 ml

Answer:

without density, we wont be able to determine what substance will float

Answer:

A hydrocarbon containing a carbon - carbon double bond.

Explanation:

Alkene is hydrocarbon containing a

carbon - carbon double bond.

( Refer the attachment to understand more clearly )

An alkene is a hydrocarbon containing a carbon-carbon double bond and the correct option is option C.

Hydrocarbons are organic compounds that are entirely made up of only two kinds of atoms – carbon and hydrogen.

The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations.

Aliphatic hydrocarbons are divided into three main groups according to the types of bonds they contain: alkanes, alkenes, and alkynes.

Alkanes have only single bonds, alkenes contain a carbon-carbon double bond, and alkynes contain a carbon-carbon triple bond.

Therefore, An alkene is a hydrocarbon containing a carbon-carbon double bond and the correct option is option C.

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