uhh i need help please its sience not chemistri sorry just cant find sience in there

Explanation:

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Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.

Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.

The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.

Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.

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Answer:

C (They must be selected for a narrow ph range.

Explanation:

Edg 2022

The enthalpy of reaction or ∆H reaction is the difference between the bond energy of the reactants and the bond energy of the products.

The term ∆H reaction refers to the heat that is evolved or absorbed in a chemical reaction. It is also known as the enthalpy of reaction.

The question is incoherent but I will try to answer as much as possible. Using the values of bond energy, ∆H reaction = Bond energy of reactants - bond energy of products. This will give us the enthalpy of reaction.

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The statement 'whether people should take medicine or if they should seek alternative treatments' describes an ethical dilemma that drug designers face.

Drug development refers to all the processes from target drug identification to drug validation and commercialization.

Drug development involves different stages of development including preclinical and clinical trials.

Ethical dilemmas in drug development include the release of a drug that is ineffective when compared to parallel treatments.

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Answer:

A drug for blood pressure is absorbed in the colon. It is effective, but occasionally it can erode the colon walls.

Explanation:

i just took the test and got it right.... i hope this helps :)

Answer:

Pb(NO

3

)

2

+

2

KI

→

PbI

2

+

2

KNO

3

Explanation:

The model that should show the corresct representation of xenon gas is one in which the gas molecules  are isolated and monoatomic.

A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.

The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.

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Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.

A balanced reaction is one where the reactants and products are present in equal amounts, and if the 100% reaction takes place, then the reactant sides have 1 mol of SbF₃ and 3 mol of CCl₄ that make the product of 1 mol of SbCl₃ and 3 mol of CClF₂. After the 100% reaction, all the reactants get converted into the product. The complete reaction is the below.

SbF₃ + 3CCl₄ → SbCl₃ + 3CClF₂

Hence, suppose  5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.

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Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

An element is a substance or material that cannot be affected by an external substance or cannot be broken down by any reaction.

Metal wire is serving as an element, it should not be easily broken or penetrated as an insulator.

Therefore, Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

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Answer:

The answer is B which is 40

From the calculations and the data presented, the total volume in the flask is 100cm^3

A neutralization occurs between an acid and a base to yiled salt and water only.

The reaction equation here is; HCl + NaOH -----> NaCl + H2O. Now, the volume of HCl used is obtained from;

2 * 20 * 1/0.5 * 1 = 80 cm^3

Total volume in the flask =  80 cm^3 + 20cm3 = 100cm^3

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Answer:

Well, if you live on a farm, you have to feed the living animals and when you eat, you use a fork, knife, napkin, chair and those are all nonliving.

Explanation:

Also, if your trying to go on a scavanger hunt, and you pick up an animal then you are  interacting with a living resource. Also water can be counted as both because water isnt alive but it can be used on living things. like if you were to drink it or water the plants.

Answer:

I use plant and dog as living things and mobile and dish as non living things everyday.

Explanation:

I use plants to get oxygen, vegetables and herbs and dog to help me to protect my home everyday. similarly, I use mobile to call others and I use dish to eat food everyday.

Answer:

With the European Climate Law, the EU committing to carbon neutrality by 2050. What does that mean in practice?

Climate change is already affecting the entire world, with extreme weather conditions such as drought, heat waves, heavy rain, floods and landslides becoming more frequent, including in Europe. Other consequences of the rapidly changing climate include rising sea levels, ocean acidification and loss of biodiversity.

In order to limit global warming to 1.5 degrees Celsius – a threshold the Intergovernmental Panel for Climate Change (IPCC) suggests is safe – carbon neutrality by mid-21st century is essential. This target is also laid down in the Paris agreement signed by 195 countries, including the EU.

In December 2019, the European Commission presented the European Green Deal, its flagship plan that aims to make Europe climate neutral by 2050. This target will be reached through the European Climate Law that sets climate neutrality into binding EU legislation.

Explanation:

ok bet i got u

Based on the calculations, the approximate ductility (%el) of this brass is equal to 2.3%.

Given the following data:

Ductility can be defined as an important property of a material which determines its ability to become elongated due to the application of stress.

Mathematically, the ductility of a material can be expressed as percentage elongation in length:

[tex]\% el = \frac{\Delta L}{L_i} =\frac{L_f - L_i}{L_i}[/tex]

Where:

For this exercise, let us assume the original length of this brass is equal to 100 meters.

Substituting the parameters into the formula, we have;

[tex]\% el = \frac{230}{100}[/tex]

Ductility = 2.3%.

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The approximate ductility (%el) of a brass that has a yield strength of 230 mpa is 2.3%.

Approximate ductility of any substance will be calculated by using the below equation as:

%el = ΔL / L₁, where

On putting this values, we get

%el = 230/100 = 2.3%

Hence 2.3% is the approximate ductility.

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Answer:

7. H

8. F

9. G.

10. D

11. A

12. E

13. B

14. C

Answer:

Carbon dioxide

Explanation:

The reaction is given by

CO2 is a harmful gas also responsible for the global warming and air pollution

When coal is burnt in the presence of excess air, some of the gases produced include carbon dioxide, oxides of nitrogen, and sulfur dioxide.

When coal is burnt in the presence of a lot of air, a variety of gases are produced: These include:

Aside from carbon dioxide, other gases depend on the content of coal.

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Explanation:

Ethanoic acid is a weak acid and dissociates:

C

H

3

C

O

O

H

⇌

C

H

3

C

O

O

−

+

H

+

For which

K

a

=

[

C

H

3

C

O

O

−

]

[

H

+

]

[

C

H

3

C

O

O

H

]

=

1.8

×

10

−

5

Please remember that these are equilibrium concentrations .

p

K

a

=

−

log

K

a

=

−

log

[

1.8

×

10

−

5

]

=

4.74

n

=

c

×

v

∴

n

C

H

3

C

O

O

H

=

0.20

×

200.0

1000

=

0.04

Answer:

you are not posted question

Entropy is commonly understood as the system's degree of disorder or unpredictability. The correct option is, (C) (iii) only

Entropy is a thermodynamic number that represents the inability of a system's thermal energy to be converted into mechanical work and is commonly understood as the system's degree of disorder or unpredictability.

The degree of unpredictability of a molecule rises when it transitions from a solid to a liquid state. As a result, the entropy will rise.

Similarly, when we move from a liquid to a gaseous state, the unpredictability of the molecule increases. As a result, the entropy will rise.

However, as we progress from gas to liquid to solid, the degree of molecular randomization reduces. As a result, the entropy will decrease.

Or, to put it another way, the higher the number of moles in a product, the higher the entropy.

(i) [tex]N_2(g)+3H_2(g) \rightarrow 2NH_3(g)[/tex]

Entropy falls in this reaction because the number of moles on the product side is fewer than the number of moles on the reactant side.

(ii) [tex]C_{10}H_8(g) \rightarrow C_{10}H_8(s)[/tex]

Entropy lowers in this process because the degree of randomness of the molecules diminishes as we move from a gas to a solid-state.

(iii) [tex]CH_3OH(l)\rightarrow CH_3OH(aq)[/tex]

Because the methanol liquid dissociated into ions, the number of moles present on the product side is more than the number of moles present on the reactant side, entropy rises in this reaction.

Hence, the correct option is, (C) (iii) only.

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Explanation:

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Given that the volume of the pure water is 480 mL and the mole of HCl added to the water is 2×10¯² mole. Therefore, the Initial and final pH of the water are:

1. The initial pH of the pure water is 7

2. The final pH of the water is 1.38

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

Molarity = mole / Volume

Molarity = 2×10¯² / 0.48

Molarity = 4.17×10¯² M

HCl(aq) —> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

4.17×10¯² M HCl will also contain 4.17×10¯² M H⁺

pH = –Log H⁺

pH = –Log 4.17×10¯²

pH = 1.38

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Answer:

994.56

Explanation:

41.44 multiplied by 4, that gives us a month.

Then multiply by 6.

Answer:

We balance chemical equations due to the law of conservation of mass, which states that mass can neither be created or destroyed. Therefore, in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. Balancing equations accounts for the total mass of the reactants and the total mass of the products.

Explanation:

We balance chemical equations due to the law of conservation of mass, which states that mass can neither be created or destroyed. Therefore, in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. Balancing equations accounts for the total mass of the reactants and the total mass of the products.

Answer:

to satisfy the law of conservation of matter.

the law of conservation states that matter can not be created nor destroyed.

Answer:

Cutting the supply of oxygen

Explanation:

We know that a thing need three things to burn

Co_2 stops oxygen supply so fire gets extinguished

Answer:

0.01134kg

Explanation:

You divide by 1000 to get the kg

Answer:

Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.

Explanation:

:)

Answer:

Explanation:

15 moles of NaCl will be obtained from 15 moles of Na.

As the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.

Boyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.

Boyle's law is expressed as;

P₁V₁ = P₂V₂

Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.

Given the data in the question;

We substitute our given values into the expression above to find the final volume.

P₁V₁ = P₂V₂

[tex]V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{4.1atm \ *\ 5.0*10^{-6}L}{1.0atm}\\ \\V_2 = \frac{4.1 \ *\ 5.0*10^{-6}L}{1.0}\\\\V_2 = 2.05*10^{-6}L\\\\V_2 = 0.021mL[/tex]

Therefore, as the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.

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Answer: 0.5 M

Explanation:

molarity is defined as [tex]\frac{mol}{L}[/tex]

in the question, we are already given the amount of moles of Ba+ and L of water. we can just plug it into the equation, [tex]\frac{1}{2}[/tex].

thus, the molarity will be 0.5 M

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Answer:

Organelles are structures within a cell that perform specific functions like controlling cell growth and producing energy. Plant and animal cells can contain similar types of organelles. However, certain organelles can only be found in plant cells and certain organelles can only be found in animal cells.

Gas laws show the relationship between tempertaure, pressure, volume, volume and number of moles. The new volume of the gas is 549 mL.

Charles law states that, the volume of a given mass of gas is directly proportional to its temperature at constant pressure .

Given that;

V1 = 500.0 mL

T1 = 25°C  or 298 K

V2 = ?

T2 = 54°C + 273 = 327 K

Since;

V1/T1 = V2/T2

V1T2 = V2T1

V2 = V1T2/T1

V2= 500.0 mL * 327 K/298 K

V2 = 549 mL

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