i. TRUE OR FALSE STATEMENTS

state whether the following statements are true or false and correct the false statements

1. Atoms of all elements follow octate rule.

2. All the electrons in atoms are termed as valance electron.

3. The ionic bond is not-directional.

4. Ionic compound exist in crystalline form.

5. Covalent compounds have low melting points.

6. All covalent compounds exist as giant aggregates.

7. Covalent bond is formed due to mutual sharing of electrons.

8. Covalent compounds are good conductors of electricity.​

Answer:

i cant see the photo but i would love to help

Explanation:

Answer:

[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].

Explanation:

Assume that the coefficient of [tex]{\rm LiOH}[/tex] is [tex]1[/tex]:

[tex]?\; {\rm Li} + ?\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].

The product side of this equation would include:

By the conservation of atoms, the reactant side of this equation should also include:

The only reactant that includes [tex]{\rm Li}[/tex] atoms is [tex]{\rm Li}\![/tex]. Thus, the coefficient of the reactant [tex]\!{\rm Li}[/tex] should be [tex]1[/tex] to ensure that the reactant side of this equation includes exactly [tex]1\![/tex] [tex]{\rm Li}\!\![/tex] atom.

Likewise, the only reactant that includes [tex]{\rm O}[/tex] atoms is [tex]{\rm H_{2}O}[/tex], with one [tex]{\rm O}\![/tex] atom in each formula unit of [tex]{\rm H_{2}O}\![/tex]. There needs to be [tex]1\![/tex] [tex]\!{\rm O}[/tex] atom on the reactant side of this equation. Therefore, the coefficient of the reactant [tex]{\rm H_{2}O}\!\![/tex] should also be [tex]1[/tex]:

[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].

The reactant side of this equation now include:

By the conservation of atoms, the product side of this equation should also include:

The product [tex]1\; {\rm LiOH}[/tex] alone would account for [tex]1\; {\rm Li}[/tex] atom, [tex]1\; {\rm O}[/tex] atom, and [tex]1\; {\rm H}[/tex] atom. Thus, there would be only [tex]1[/tex] more [tex]{\rm H}[/tex] atom for the other product, [tex]{\rm H_{2}}[/tex]. However, since there are [tex]2[/tex] [tex]{\rm H}\![/tex] atoms in every formula unit of [tex]{\rm H_{2}}\![/tex], the coefficient of [tex]\!{\rm H_{2}}[/tex] would need to be [tex](1/2)[/tex]:

[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + (1/2)\; {\rm H_{2}}[/tex].

Atoms of each element are indeed conserved in this equation.

Eliminate the fractions by multiplying all coefficients by [tex]2[/tex] (least common denominator of all coefficients in this equation):

[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].

Answer:

ALPHA

Explanation:

Answer:    Answer:

21.03L

Explanation:

V1 = 456mL = 0.456L

T1 = 23°C = (23 + 273.15)K = 296.15K

P1 = 50atm

V2 = ?

T2 = 273.15K

P2 = 1.0atm

Note : P2 and T2 are at STP which are 1.0atm and 273.15K

To find V2, we have to use the combined gas equation,

(P1 × V1) / T1 = (P2 × V2) / T2

P1 × V1 × T2 = P2 × V2 × T1

V2 = (P1 × V1 × T2) / (P2 × T1)

V2 = (50 × 0.456 × 273.15) / (1.0 × 296.15)

V2 = 6227.82 / 296.15

V2 = 21.029L

Final volume of the gas is 21.03L

Explanation:

Answer:

The pressure exerted by 66.0 g of CO₂ gas at -14.5°C that occupies a volume of 50.0 L is 0.636 atm.

How do we calculate pressure?

Pressure of any gas will be calculated by using the ideal gas equation as:

PV = nRT, where

P = pressure of gas = ?

V = volume of gas = 50L

R = universal gas constant = 0.082 L.atm/K.mol

T = temperature of gas = -14.5°C = 258.65 K

n is moles of gas and it will be calculated as:

n = W/M, where

W = given mass of CO₂ = 66g

M = molar mass of CO₂ = 44 g/mol

n = 66/44 = 1.5 moles

On putting values we get

P = (1.5)(0.082)(258.65) / (50)

P = 0.636 atm

Hence required pressure is 0.636 atm.

Explanation:

Hope This Helps

Have A Great Day

~Zero~

Answer:

- 65 kJ

Explanation:

Hess's Law of Constant Heat Summation (or just 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

A+2B   +   B + 2C   ===>   C +D   + 2C+ D

   -20kJ      -45 kJ  ===>   3C + 2D

-65 kJ

Answer:

I thank it is because of the cold It doesn't really taste sweet because the temperature is lower hence the sugar does not dissolve properly.

Dissolution of a solute

Answer:

they are more likely to get sick from the same disease

Black-footed ferrets are the most endangered mammal of North America. The problem that most black-footed ferrets today are closely related because they are more likely to get sick from the same diseases.

An endangered species are the species that can become extinct in the future, either worldwide.

The problem of the  black-footed ferrets today are closely related is that they are more likely to get sick from the same diseases.

Thus, the correct option is C.

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Answer:

I think the answer would be C because energy is only transferred.

Explanation:

Hope this helps:)....if it's wrong then sorry for wasting your time and may God bless you:)

Answer:

I think that this would be an example of erosion

If the pH of a solution is 7, the pOH of the solution will be 7.

The concentration of the hydroxide ion (OH-) in a solution is measured by pOH.

This is a fundamental equation to calculate the pH and pOH.

pOH = 14 - ph

The pH is given 7

Putting the value of pH in the formula

pOH = 14 - 7 = 7

Thus, the pOH will be 7, if the pH of a solution is 7.

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Answer:

yes

Explanation:

math is used constantly to improve one's performance. Achieving the objective of shooting a basketball includes using percentages and angles. By finding the most consistent percentage of shots made while using a certain angle, you can find out which player will score the most baskets.

Answer:

c-)O2

Explanation:

Answer: A

Explanation:

A food web is just a bigger picture idea and more complex version of a food chain.

Answer:

a. many food chains linked together

Explanation:

A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.

Answer: Ernest Z. The concentration would be 0.76 mol/L.

The concentration can be expressed as the quotient between the masses.

We define the concentration (of something) in a solution, as the amount of that thing that there is in the solution.

With that in mind, the concentration can be defined by the quotient between the mass of the particular thing and the mass of the solution.

For example, in a mix of water and salt, the concentration of salt would be given by the quotient between the mass of salt and the total mass of the mix.

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Explanation:

Answer:

d

Explanation:

Alfred Wegener was the one who proposed the idea although he wasn't believed until after he died

The scientist who presented the theory of Continental Drift is Alfred Wegener. The correct option is D.

The continental drift idea provided an explanation for why the continents had moved from their original places. Once linked as a single entity, called a "Subcontinent."

Since continental rocks are too light to sink to the ocean floor, the common belief that mountains were to blame for their sinking was later disproved.

Alfred Lothar Wegener is a climatologist. He discovered the continental drift theory. The science of plate tectonics has now supplanted the theory of continental drift. The scientist Alfred Wegener is most closely identified with the hypothesis of continental drift. He referred to it as continental drift.

Therefore, the correct option is D. Alfred Wegener.

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Answer:

10g

Explanation:

The fission reaction released the most energy per amu when compared to the fusion reaction.

The amount of energy released per amu for fusion is given as 0.36 J/amu.

The amount of energy released per amu for fission is given as 0.85106383 J/amu.

From the different energy released per amu, it is obvious that  0.85106383 J/amu is greater than 0.36 J/amu.

Thus, the fission reaction released the most energy per amu when compared to the fusion reaction.

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In Beaker A, 2.0 grams of zinc powder is mixed with 1.0 M HCl acid & in Beaker B, 2.0 grams of zinc powder is mixed with 6.0 M HCl acid so in beaker B reaction occur faster.

Rate of reaction of any chemical reaction gives idea about the speed of the completion of the given reaction, and rate of reaction is directly proportional to the concentration of the reactant species.

If the concentration of reactants increases then the rate of the reaction also increases. According to the question concentration of zinc powder is same in both beakers.

In beaker A, concentration of HCl is 1M and in Beaker B is 6M respectively so the rate of reaction is faster in beaker B.

Hence in beaker B reaction occur faster.

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Answer:

Global warming is a gradual increase in the earth's temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.

Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.

Since the pre-industrial period, human activities are estimated to possess increased Earth’s global average temperature by about 1 degree Centigrade (1.8 degrees Fahrenheit), variety that's currently increasing by 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. Most of the present warming trend is extremely likely (greater than 95 percent probability) the results of act since the 1950s and is proceeding at an unprecedented rate over decades to millennia.

Climate change may be a long-term change within the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.

Global warming occurs when CO2 and other air pollutants and greenhouse gases collect within the atmosphere and absorb sunlight and radiation that have bounced off the earth’s surface.

Normally, this radiation would escape into space — but these pollutants, which may last for years to centuries within the atmosphere, trap the warmth and cause the earth to urge hotter. That's what's referred to as the atmospheric phenomenon.

Melting glaciers, early snowmelt, and severe droughts will cause more dramatic water shortages and increase the danger of wildfires. Rising sea levels will cause coastal flooding on the Eastern Seaboard, especially in Florida, and in other areas.

Forests, farms, and cities will face troublesome new pests, heat waves, heavy downpours, and increased flooding. All those factors will damage or destroy agriculture and fisheries. Disruption of habitats like coral reefs and Alpine meadows could drive many plant and animal species to extinction.

~ extracted from Global warming documentary.

Climate change encompasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and habitats, rising seas, and a variety of other impacts. All of these changes are emerging as humans still add heat-trapping greenhouse gases to the atmosphere, changing the rhythms of climate that each one living things have come to believe.

Answer:

Chemistry plays a large role in obstetrics and gynecology. For instance, urinalysis requires an understanding of bilirubin levels and their conjugation with glucuronic acid to create a compound that is water soluble. This is passed through the blood stream and urinary system to create urobilirubin.

Explanation:

Answer:

The process of obtaining metals from their ores is called metallurgy . The process employed in getting the ore depends on the nature of the ore and the impurities present in it.

The ore in which they are found depends on their reactivity. For example,reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide

Taking into account the definition of calorimetry, the heat change that would take place as 25.7 g of liquid Ethyl alcohol are cooled from 55.2 °C to 30 °C is -1554.336 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

Q= 2.40 [tex]\frac{J}{gC}[/tex]× 25.7 g× (30 °C - 55.2 °C)

Solving:

Q= -1554.336 J

Finally, the heat change that would take place as 25.7 g of liquid Ethyl alcohol are cooled from 55.2 °C to 30 °C is -1554.336 J.

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Answer:

0.025 L KOH

Explanation:

Because you gave molarity and moles, I am assuming that you are looking for volume via the molarity equation. I simply plugged the given values into the molarity equation and rearranged to isolate the liters variable.

Molarity (M): 0.1 M

Moles: 0.0025 moles

Volume (L): ? L

Molarity (M) = moles / liters (L)

0.1 M KOH = (0.0025 moles KOH) / (? L KOH)

(0.1 M KOH) x (? L KOH) = 0.0025 moles KOH

? L KOH = (0.0025 moles KOH) / (0.1 M KOH)

? L KOH = 0.025 L KOH

The reaction is an unbalanced redox reaction hence, the reaction  can be balanced by using the half-reaction method.

The term redox reaction refers to the reactionnin which electrons are transferred hence one specie is oxidized while the other specie is reduced.

Looking at the reation as shown, we can see that the reaction is an unbalanced redox reaction hence, the reaction  can be balanced by using the half-reaction method.

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Answer:

B

Explanation:

I answered all of them except 2 for you to do

Hope this helps :))

Explanation:

This is not accurate because you cannot hear sound in space, you would most likely hear a giant explosion since that is what is happening in the movie I guess, they just added the sound to make the movie more appealing to watch, this isn't really what would happen in space. if anything you would just see the explosion and not be able to hear it at all. SOUND DOESNT TRAVEL IN SPACE.