Of the following, which are not colloids? (select all that apply)
Select all that apply:
A. A cloud
B. Brass
C. • Saltwater
D. Vinegar

Answer:

69g

Explanation:

Given reaction expression:

             2NO  +  O₂ →2 NO₂

Unknown:

Mass of NO₂ produced  = ?

Solution:

To solve this problem, let us use the mole concept. We solve from the known to the unknown

In this regard, find the number of moles of O₂ given;

  Number of moles  = \(\frac{mass}{molar mass}\)  

Molar mass of O₂  = 2(16g/mol)  = 32g/mol

  Number of moles  = \(\frac{12}{16}\)   = 0.75mole

From the balanced reaction equation;

    1 mole of O₂ will produce 2mole of NO₂;

   0.75 mole of O₂ will produce 1.5mole of NO₂

Therefore, mass of NO₂;

  Mass of NO₂ = number of moles x molar mass

  Molar mass of NO₂ = 14 + 2(16) = 46g/mol

  Molar mass of NO₂ = 1.5 x 46  = 69g

The pressure she exerts on the carpet sample:-5.8279 MPa

P = F/A

Where,

F= Force

A = Area

Given that;

d= 0.987 cm =0.987  x 10^-2 m

m= 45.5 kg

Area = πr^2= (π(0.987  x 10^-2)^2/2)

       =7.6511 x 10^-5  square meter

Force= mg

        = 45.5 x 9.8

        =445.9 N

Pressure = force/ area

              =445.9/7.6511 x 10^-5

              =5.8279 MPa

The pressure she exerts on the carpet sample:-5.8279 MPa

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Answer:

The correct answer is (C) 0.2 mole MgCl2

Explanation:

Answer:

answer is here bit.^{}ly/3gVQKw3

Answer:

pi

Explanation:

In chemistry, a covalent bond is formed by the overlap of atomic orbitals. The bond formed may be a sigma bond or a pi bond depending on the way the atomic orbitals are overlapped.

If the overlap occurs in a side-to-side manner, the bond formed is said to be a pi bond. Pi bonds are common in organic species having multiple bonds such as ethene and benzene.

The 3-isopropyl-1,1-dimethylcyclohexane equatorial ethyl group's most stable configuration (more stable).  The equatorial conformer of ethylcyclohexane is 7.4 kJ/mol more stable than the axial conformer.

a) Ethylcyclohexane: The most stable conformation of ethylcyclohexane is the chair conformation. In this conformation, equatorial ethyl group's the cyclohexane ring adopts a chair shape, and the ethyl group is equatorial to minimize steric hindrance.

b) 3-Isopropyl-1,1-dimethylcyclohexane: The most stable conformation of 3-isopropyl-1,1-dimethylcyclohexane is also the chair conformation. In this conformation, the bulky isopropyl and dimethyl groups are positioned in equatorial positions to minimize steric hindrance.

c) cis-1-tert-butyl-4-isopropylcyclohexane: The most stable conformation of cis-1-tert-butyl-4-isopropylcyclohexane is also the chair conformation. In this conformation, the tert-butyl and isopropyl groups are oriented in equatorial positions to minimize steric hindrance.

These descriptions provide a general idea of the most stable conformations for the given molecules. It is important to note that a visual representation or a three-dimensional model would be more helpful for a detailed analysis of their conformations.

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A table comparing the important parameters of the two engine designs is shown below:ParametersDesign 1Design 2Compression Ratio 18:118:1Φ (Equivalence Ratio)0.75 (Richer)0.65 (Leaner)EGR Level 10%15%Intake Temperature 80°C100°C Intake Pressure 1 bar0.5 bar Intake Valve Closing −15 deg BTDC−25 deg BTDC.

The compression ratio is the ratio of the volume of the combustion chamber from its largest capacity to its smallest capacity. The compression ratio in Design 1 is 18:1, while in Design 2, it is 18:1. The higher compression ratio is seen in Design 1, which will lead to a higher engine efficiency since more fuel energy is converted into useful work.

The Φ (equivalence ratio) is the ratio of the actual air/fuel ratio to the stoichiometric air/fuel ratio. A Φ value of 1.0 indicates a stoichiometric mixture, whereas values less than 1.0 indicate a lean mixture and values greater than 1.0 indicate a rich mixture. The Equivalence ratio in Design 1 is 0.75, which means it is running rich, while in Design 2, it is 0.65, which means it is running lean.

The design 2 engine has a higher Φ (equivalence ratio) level, which may lead to lower NOx emissions due to lean-burn combustion.The EGR (Exhaust Gas Recirculation) level in Design 1 is 10%, whereas in Design 2, it is 15%. The EGR level in Design 2 is higher than that in Design 1, which can help to reduce NOx emissions by lowering the temperature of combustion.

Intake temperature is 80°C in Design 1, whereas in Design 2, it is 100°C. The higher intake temperature in Design 2 means that the engine will have a higher thermal efficiency due to the increased Carnot efficiency.Intake pressure is 1 bar in Design 1, while in Design 2, it is 0.5 bar. The higher intake pressure in Design 1 results in more air being compressed into the combustion chamber, allowing for more fuel to be burned and greater efficiency.

Intake Valve Closing (IVC) is −15 deg BTDC in Design 1 and −25 deg BTDC in Design 2. The IVC timing is responsible for trapping the charge in the combustion chamber and influencing the engine's breathing. The lower IVC timing in Design 2 provides less resistance to flow, resulting in greater volumetric efficiency.

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Answer:

Bond between N and Br is non polar bond

Answer:

Explanation:

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

Measles is a communicable disease that requires immunization to prevent illness when exposed to it.

Measles is a communicable disease and highly contagious. It  is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.

It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.

The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.

Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.

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Explanation:

Plastic takes time to degrade which means it has great longevity. Plastic does not break as easily as glass or other materials. It lasts long and offers great service. Plastic storage containers offer greater flexibility than any other packaging materials.

Answer:74

Explanation:

Answer:

I believe Tungsten has 2 valence electrons.

Explanation:

Hope this helps!

Answer:

i have no clue good luck

Explanation:

Rigel IV is approximately 63.3 trillion miles away from Earth.

One light-year is a unit of distance that is defined as the distance that light travels in one year. Since light travels at a constant speed of approximately 186,282 miles per second (299,792 kilometers per second), which is approximately 5.88 trillion miles. Therefore, to convert 10.8 light-years to miles, we can multiply 10.8 by the number of miles in one light-year:

10.8 light-years * 5.88 trillion miles per light-year = 63.3 trillion miles

Therefore, Rigel IV is approximately 63.3 trillion miles away from Earth.

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Answer:

1: c. elements

2: b. sulfer and oxygen

3:  ( im not sure. im sorry ):

4:  ( im not sure either ):

5: d. they will neutralize each other

Explanation:

i hope the questions i answered helped! im really sorry i couldnt help on 3 and 4. please forgive :(

good luck on ur test!

Answer: the answe

Explanation: 18 cabron - c hydr3gon is  is  46.20

Answer:

Examples of natural condensation polymers include cellulose, starch, and polypeptide chains of proteins. Several synthetic condensation polymers discussed include nylon, kevlar, polyester, Bakelite, Melamine, polycarbonates, polyurethanes, epoxies

Explanation:

As the size of the ions is smaller, there will be a stronger attraction between the two opposite ions.

When the charge on the two opposing ions is bigger, there will be a stronger attraction between them.

Because YF₃ has a higher Y+3 charge, it will be more attractive. Yet, due to the decreased charge in Rb+1, RbF will have weaker attraction.

The ionic compounds in increasing order is RbF < SrF₂ < YF₃

Positively charged ions, known as cations, and negatively charged ions, known as anions, make up ionic compounds, which are neutral substances. The name of the cation is written first, followed by the name of the anion, for binary ionic compounds (ionic compounds that only contain two types of elements).

Typically, they are crystalline solids. Both their melting and boiling points are very high. Typically, they are insoluble in organic solvents but soluble in water. When melted or dissolved in water, they conduct electricity.

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Answer

I think its

1250J

Using a large sample size in an experiment has several benefits, including:

1. Increased statistical power: A larger sample size allows for greater statistical power, which means that the likelihood of detecting a true effect in the data is increased.

This is because a larger sample size reduces the impact of random variability and increases the ability to detect smaller differences between groups.

2. Improved representativeness: A large sample size can increase the representativeness of the sample, making it more likely to accurately reflect the population being studied.

This is particularly important in research where the goal is to generalize the findings to a larger population.

3. Enhanced precision: A larger sample size can lead to more precise estimates of population parameters, such as means and variances. This is because larger samples are less likely to be affected by random sampling error.

4. Increased generalizability: A larger sample size can increase the generalizability of the findings to other populations or contexts.

This is because larger samples are more likely to capture a wider range of individual differences and variability, making it easier to draw conclusions that are applicable to other situations.

Overall, using a large sample size can increase the accuracy, reliability, and generalizability of research findings, making them more useful for making informed decisions and advancing scientific knowledge.

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Answer:

The correct option is;

Action potentials travel the length of the axon

Explanation:

A dendrite are nerve cell projections that are used for receiving signals from other nerve cells

A neurotransmitter is the chemical, produced by the nerve cell to contain the message the nerve cell intends to transmits across a neural junction, to the cell for which the message is meant such as a muscle cell, gland cell, or other nerve cells

Therefore, the received message from the dendrite by the present neuron are transported using action action potential which is the means by which electrical signals are transported by a neuron through the length of the axon which is the projection of the nerve cell, known as the nerve fiber that conducts action potential which are electrical impulses to other destination by traveling the length of the of the axon to the location of the destination cell of the action potential

Answer:

D

Explanation:

A: not true. You could have cement floors and still receive radio/TV

B: not true. Very little of the waves are absorbed by the walls.

C: not true. You can receive radio/TV if there isn't a carpet in the entire house.

D: Dis the answer. Walls don't absorb the incoming waves or not much of them

Answer: No

Explanation:  The snacks did not work because the result of the snails either stayed the same, or decreased.

Answer:

The molecular mass (MW=molar mass) for the chemical compound, NaCl is 58.443

Explanation:

Na being Sodium in the alkali metal group (1 valence electron) has a cumulative molecular mass of 22.990 mol., whereas Cl being Chlorine in the halogen group (7 valence electrons) has a cumulative molecular mass of 35.453. Therefore the sum of both molar masses (MW) is equivalent to 58.443  mol.

*Hope this helps.

The emf of the cell reaction as calculated from standard electrode potential is 0.35V and the correct option is option B.

The standard electrode potential, abbreviated as E, is the measure of potential of a reaction that occurs at the electrode when all the substances involved in the reaction are in their standard states that is solutions are at 1M concentrations, gases at 1 atm pressure and solids and liquids are in pure form with all at 25C.

Given,

E⁰ for Zn = 0.76

E⁰ for Fe = - 0.41

E⁰ = E⁰( cathode ) + E⁰( anode)

= - 0.41 + 0.76

= 0.35 V

Thus, the ideal selection is option B.

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Answer: The specimens appears larger with a higher magnifications because a smaller area of the object is spread out to cover the filed view of your eye.

Explanation:

Answer:

Jelani Jones

Explanation:

But I thought it was 2 not three

Answer:

To determine the amount of a 70% acid solution and a 20% solution needed to produce a 45% solution, we can set up a system of equations based on the principles of concentration and volume.

Let's assume that x mL of the 70% acid solution needs to be mixed with (200 - x) mL of the 20% solution.

The total amount of acid in the resulting mixture can be calculated as follows:

0.70x + 0.20(200 - x) = 0.45(200)

Now, let's solve this equation to find the value of x:

0.70x + 40 - 0.20x = 90

0.70x - 0.20x = 90 - 40

0.50x = 50

x = 50 / 0.50

x = 100

Therefore,

100 mL of the 70% acid solution needs to be mixed with (200 - 100) = 100 mL of the 20% solution to produce 200 mL of a 45% solution

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Answer:

I think it is b

Explanation: