Each person in a room is assumed to be producing carbon dioxide at the average rate of 0.0107 cfm (5.0 ml/s) and air with a CO2 concentration of 280 ppm is being supplied to the room at the rate of 6000 cfm (2.8 m3/s). It is desired to keep the concentration level of CO2 in the space below 1000 ppm. Assuming complete mixing, determine how many persons could occupy the room and not exceed the desired CO2 level.

Answer:

Nervous

Explanation:

Nervous tissue is composed of two main cell types: neurons and glial cells. Neurons transmit nerve messages.

Answer:

A and B is the answer as there structure change

Answer:

Because the infrared lamp gives off a type of light that the desk lamp does not, and the mirror can only take in the energy from the infrared light.

Explanation:

Answer:

False

Explanation:

A change of state is not an example of a chemical reaction.

A chemical reaction cannot be reversed. This example however, can be. You can melt the wire down and them form it back into iron pellets

Answer:

False

Explanation:

The key to a chemical reaction is "irreversible change". If you can change it back to what it was before, it's not a chemical reaction. This is an example of a physical change.

Answer:

Option C. 11.2 L

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T₁) = 25.0 °C

Initial volume (V₁) = 8.66 L

Final temperature (T₂) = 112 °C

Pressure = constant

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 25 °C

Initial temperature (T₁) = 25 °C +273

Initial temperature (T₁) = 298 K

Final temperature (T₂) = 112 °C

Final temperature (T₂) = 112 °C + 273

Final temperature (T₂) = 385 K

Finally, we shall determine final volume of the gas. This can be obtained as follow:

Initial temperature (T₁) = 298 K

Initial volume (V₁) = 8.66 L

Final temperature (T₂) = 385 K

Pressure = constant

Final volume (V₂) =?

V₁/T₁ = V₂/T₂

8.66/298 = V₂/385

Cross multiply

298 × V₂ = 8.66 × 385

298 × V₂ = 3334.1

Divide both side by 298

V₂ = 3334.1 / 298

V₂ = 11.2 L

Thus, the final (i.e new) volume of the gas is 11.2 L

Answer:

1. Sound

2.heat energy to light energy

3.chemical

4.chemical energy to electrical energy

Explanation:

Answer:

1. A

2. F

3. J

4. P

Explanation:

1. A. sound

2. F. electrical energy to sound energy

3. J. chemical

4. P. chemical energy to mechanical

Answer:

ANSWER is E

Explanation:

2H₃PO₄ + 3Ca(OH)₂→ 6H₂O + Ca₃(PO₄)₂

Answer:

First step is to find what the products would be. Since this seems to be a double displacement, you get: H3PO4(aq)+Ca(OH)2(aq)→ H2O(L)+Ca3(PO4)2(s)

You know the products because H has a charge of +1, so PO4 must have a charge of -3, and since OH has a charge of -1, Ca must be +2. Then make each compound have a net charge of 0. H20 is a liquid since aq solutions have liquid water. Ca3(PO4)2 is a solid, use the solubility rules.

Lastly, balance the equation: 2H3PO4(aq)+3Ca(OH)2(aq)→ 6H2O(L)+Ca3(PO4)2(s)

So the salt formed is Ca3(PO4)2

Answer:

Velocity includes Direction

So you need to know if it was going up or down

Explanation:

Answer:

See explanation

Explanation:

CO2 is often released by the combustion of fossil fuels. Fossil fuels are quite common sources of energy in our world today.

A lot power plants, vehicles, etc rely on energy produced as a result of the combustion of fossil fuels yielding carbon dioxide.

Hence, irrespective of the fact that CO2 leads to global warming but Nigeria is still ranked one of the greatest emitters of CO2.

The menace of rising CO2 leves can only be checked by stakeholders in the energy sector coming together to exploit renewable energy as a regular source of energy.

Answer:

answer is 76

Explanation:

pls mark me brainliest right

Answer:  

0.7

76.7

this is for (LEAD) the last one

Answer:

fire > rocks > air

Written Answer: Covalent bonds hold atoms together in molecules and polyatomic ions where as intermolecular forces hold molecules together in a liquid or solid. Intermolecular forces are generally much weaker than covalent bonds.

Explanation/Evidence: "In contrast to intramolecular forces, such as the covalent bonds that hold atoms together in molecules and polyatomic ions, intermolecular forces hold molecules together in a liquid or solid. Intermolecular forces are generally much weaker than covalent bonds."

Answer:

e. BaSO4 and KCI.

Explanation:

Hello there!

In this case, given the reactants side:

[tex]BaCl_ 2(aq) +K_ 2 SO_ 4(aq)[/tex]

It is possible to realize that after the reaction takes place barium replaces potassium and therefore barium sulfate and potassium chloride are formed:

[tex]BaCl_ 2(aq) +K_ 2 SO_ 4(aq)\rightarrow BaSO_4(s)+2KCl(aq)[/tex]

Therefore, the products turn out to be e. BaSO4 and KCI.

Best regards!

Answer:

[tex]\huge\boxed{sp \ hybridization}[/tex]

Explanation:

In HCN,

Carbon is singly - bonded ( 1 sigma bond ) to Hydrogen while triply - bonded ( 1 sigma, 2 pi bonds) to Nitrogen.

Thus, the Stearic No. for Carbons is:

= No. of sigma bonds + No. of lone pairs

= 2 + 0

= 2

According to Stearic No.:

=> sp = 2

=> sp² = 3

=> sp³ = 4

Hence,

The hybridization of C in HCN is sp.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

HCl(aq) + KOH(aq --> KCl(aq) + H₂O(l)

Explanation:

Answer:

B Kinetic

Explanation:

Kinetic energy is the energy of a object in motion

Answer:

B. Solid

Explanation:

As the problem states, the stronger the cohesive forces of a substance, the more ordered that substance is.

Asking which state has the strongest cohesive forces is the same as asking which state is the most organized.

Solids are more organized than liquids (as solids have a definite shape and volume). Liquids are more organized than gases (as liquids have a definite volume).

Answer: The hydrogen ion concentration in molarity is 0.013

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pOH is calculated by taking negative logarithm of hydroxide ion concentration and pH is calculated by taking negative logarithm of hydrogen ion concentration

Putting in the values:

[tex]pOH=-\log[7.609\times 10^{-13}][/tex]

[tex]pOH=12.1[/tex]

Now , [tex]pH+pOH=14[/tex]

[tex]pH=14-12.1=1.9[/tex]

[tex]pH=-\log [H^+][/tex]

[tex][H^+]=0.013M[/tex]

The hydrogen ion concentration in molarity is 0.013

Answer:

6.22 × 10⁻⁵

Explanation:

Step 1: Write the dissociation reaction

HC₆H₅COO ⇄ C₆H₅COO⁻ + H⁺

Step 2: Calculate the concentration of H⁺

The pH of the solution is 2.78.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -2.78 = 1.66 × 10⁻³ M

Step 3: Calculate the molar concentration of the benzoic acid

We will use the following expression.

Ca = mass HC₆H₅COO/molar mass HC₆H₅COO × liters of solution

Ca = 0.541 g/(122.12 g/mol) × 0.100 L = 0.0443 M

Step 4: Calculate the acid dissociation constant (Ka) for benzoic acid

We will use the following expression.

Ka = [H⁺]²/Ca

Ka = (1.66 × 10⁻³)²/0.0443 = 6.22 × 10⁻⁵

Answer:

Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)

Explanation:

CaS (aq) + CdCl₂ (aq) –> CdS (s) + CaCl₂ (aq)

The complete ionic equation for the above reaction can be obtained as illustrated below:

In solution:

CaS (aq) —> Ca²⁺(aq) + S²⁺(aq)

CdCl₂ (aq) —> Cd²⁺(aq) + 2Cl¯(aq)

CaS (aq) + CdCl₂ (aq) –>

Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)

Answer:

A strong base increases the OH- ion concentration in an aqueous solution.

Explanation:

According to the Arrhenius theory, acids donate H+ and bases donate OH- to a solution.

Answer:

to answer your question "which state of matter have most space between particles"

gas is your best answer

Explanation:

when in gas form..particles gain energy and move further apart

for solids particles are fixed (stays in one spot) and vibrates and for liquids particles gain energy but doesn't have enough space to move around freely..so gas is you best answer

Answer:

How may we help kind sir

Explanation:

and if this was for points thanks

Answer❣

The required speech is as follows :

_______________

"Whoever controls media, controls mind". A very hearty Good Morning to one and all present here ! Respected Principal Sir, worthy teachers and all my dear fellow mates. Today I Aurora, of class XYZ is standing before you in this frizzy winter to deliver a short speech on the topic 'How media influences public opinion'.

Dear friends, first of all I would like to ask you all a question, 'What do you think is our media for ?' Most of us will reply that they are for our entertainment, fun and even unfortunately some will reply 'for movies and Bollywood'. Now if we look back at our history during 18th century we see that even first newspapers were started for spreading information in mass. Earlier literacy rate of India was very low.

A single person used to first read the newspaper and then shared the information to the gathered people around. But that time was different. Now nearly every person has a mobile phone, TV, PC and what not. Has this increased public participation in Democracy ? Yes indeed it has done that. On one single click we get information of our surrounding at a faster pace. As a fourth pillar of Democracy it makes our mindful of different social, political and financial exercises around us.

If we take current situation, most of the election popularisation works in different states is being managed by mass media only due to its advancements. Media makes participation of people in political activities even at grass - root levels. This efficiency enhances the Federalism of India. Media has many roles in shaping public opinion in our society. Let's discuss them one by one. In economic terms, media shows the expenditure, budgets and taxes to the citizens of a nation.

It makes people aware of the different types of money related issues that they have to face. Even it checks that no people are harassed by fake news on balances. Its makes people rise over their concern directly to the government so that actions can be taken for them. In social terms, media promotes the functioning of the government. It helps people to convey their social problems to the government. Even many NGOs and Human Rights Organizations take help of medias to make people aware of their rights.

Commonly Media acts as an inference or better to say 'compass' which gives direction to the views of people. It organises the vast multitudes of opinions into a single issue which can be beneficial to all the groups of society. It works 24 × 7 and makes people get in touch with latest developments. As 'Opposition' in Politics, media acts as a hub where the opposition party by taking views of public claims the wrong decisions of Ruling Party.

Also, during elections media shows mirror about different parties to people so that we can make right decision in voting. All these were some positive aspects of media's influence on public opinions. Now let's discuss about some negative aspects also. Nowadays its a common seen trend that media enlarges a short issue just to gain popularity. This results in riots, violence, protests, etc. because the issue which could have been solved by a single subtle discussion, now has been made a larger issue.

Let me present an example. I have a friend, Cupicake. She remains quite much familiar with medias. Some days ago, she received a post which asked her to share the image attached with it to her other friends. That image was of a case where Police was beating a few groups of people. She has shared that. This led a immediate violence in that region and finally it was known that Police was beating a few robbers. Now who to put blame of that riot ? Of course we are the one who done it.

At last I would like to conclude my speech by just saying that, it is the duty of media to transfer right and reliable information to people and its duty of people to share and trust upon right information from a good source. In this way the world and the nation would be leaded to right path.

Thank you one and all.

_______________

★ More to know :-

Format of Speech :

*Note - Here I used name as Aurora. You can use any according to your choice and class also according to the situation.

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hope that u r helpful

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