Question 4 of 5
Which characteristic describes the living things in the domain Eukarya?
A. They can be made up of prokaryotic cells.
B. They are made up of eukaryotic cells.
C. They are all multicellular organisms.
D. They are made up of cells that lack a nucleus.
SUBMIT

Answer:

A.  gases only

Explanation:

It is only in gases that the particles are very far apart so they can fill their contains.

There are four major states of matter which solid, liquid, gases and plasma.

So, option A is the perfect answer.

Answer:

It should be B: 0.01 kJ

Answer:

Hey...The answer is B) 0.01 kJ

Answer:

In ionic bonding, atoms transfer electrons to each other. Ionic bonds require at least one electron donor and one electron acceptor. In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.

They share electrons between them

Answer:

Percent yield = 88%

Explanation:

Given data:

Mass of C₇H₆O₃ = 200.0 g

Actual yield of aspirin = 231 g

Percent yield  = ?

Solution:

Chemical equation:

C₇H₆O₃  + C₄H₆O₃      →       C₉H₈O₄ + C₂H₄O₂

Number of  moles of aspirin:

Number of moles = mass/molar mass

Number of moles = 200.0 g/ 138.12 g/mol

Number of moles =  1.45 mol

Now we will compare the moles of aspirin with C₇H₆O₃.

                          C₇H₆O₃           :           C₉H₈O₄

                               1                 :               1

                            1.45              :             1.45

Theoretical yield of aspirin:

Mass = number of moles × molar mass

Mass = 1.45 g × 180.158 g/mol

Mass = 261.23 g

Percent yield:

Percent yield =( actual yield / theoretical yield )× 100

Percent yield =  (231 g/ 261.23 g)× 100

Percent yield = 0.88 × 100

Percent yield = 88%

Answer:

(B) CHO

Explanation:

A covalent bond is a bond type usually formed between non-metals that have little to no electronegativity differences between them.

Bonds between metals and non-metals are usually ionic in nature. All the other given choices are ionic and a combination of covalent bond.

CHO contains non-metals that are electronegative. There will be sharing of electrons between these atomic species and this will lead to a covalent bond.

Answer:

Explanation:

The  role of enzymes in a chemical reaction is to : Lower the activation energy while increasing the rate of reaction

The graph shown on the left is an uncatalyzed chemical reaction while the graph on the right is a catalyzed chemical reaction.

Catalyzed chemical reactions have lower activation energy and a faster rate of reaction while uncatalyzed chemical reaction has a higher activation energy and a slower reaction rate. because catalyst increases the rate of a chemical reaction by lowering its activation energy.

Hence we can conclude that The  role of enzymes in a chemical reaction is to : Lower the activation energy while increasing the rate of reaction

Describe the relationship between evaporation and a rainy climate in one or two sentences.

A liquid transforms into a gas during evaporation. It is easy to visualize when raindrops "vanish" from puddles on a hot day or when wet clothing dries in the heat. Instead of really dissipating in these situations, the liquid water is evaporating into a gas known as water vapor. Global evaporation takes place.

Evaporation occurs on surfaces. Because it happens when molecules with more kinetic energy from the top layer of the liquid escape into the air, evaporation is a surface phenomenon.

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NaOH contains an electrolyte consisting of a base. All soluble salts, acids, as well as bases dissolved inside a polar solvent.

An electrolyte is a material containing ions that conducts electricity through the motion of those ions but does not conduct electrons. All soluble salts, acids, as well as bases dissolved inside a polar solvent, including such water, fall into this category.

When the material dissolves, it splits into cations and anions which spread evenly throughout the solvent. There are other solid-state electrolytes. The term electrolyte describes the substance that's also dissolved in medicine and occasionally in chemistry. NaOH contains an electrolyte consisting of a base.

Therefore, NaOH contains an electrolyte consisting of a base.

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The first equivalence point in the titration of H2CO3 (carbonic acid) with LiOH (lithium hydroxide) occurs when all the H2CO3 has been converted to its conjugate base HCO3-. At this point, the primary species in solution would be HCO3- and Li+. Therefore, the correct answer is b. HCO3-.

Carbonic acid is a carbon-containing compound which has the chemical formula H2CO3. Solutions of carbon dioxide in water contain small amounts of this compound. Its chemical formula can also be written as OC(OH)2 since there exists one carbon-oxygen double bond in this compound.

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Answer:

a

Explanation:

Answer:

Gain 3 electrons.

Explanation:

If element X have 5 valence electrons it will more than likely gain 3 electrons to fill its octet to become stable. Gaining the 3 electrons is much easier for the atom than if it were to give away it's 5 valence electrons. Elements with 5 valence electrons that could represent element X are:

Answer:

180

Explanation:

proton = 80

electron = 80

neutron = 100

Note:- the atomic number of an element is the number of protons/electrons in the atomic shell

(protons = electrons)

Mass number = number of protons/electrons + number of neutrons

MN= NP+ NN

MN = 80 + 100

MN= 180

I HOPE THIS HELPS

1) The sun is a stat that is located in the middle of the solar system.

2) It gets squeezed together so lightly that four hydrogen nuclei combine to firm form helium atom. This is called nuclear fusion.

3) Solar flares, coronal mass ejection, high-speed solar wind and solar energetic particles.

To make a 3% solution of acid alcohol, you need to add 29.1 ml hydrochloric acid (HCl) to 970 ml of 95% ethanol.

To calculate how much HCl you need, you can use the formula:

Amount of HCl = Desired concentration x Volume of ethanol/100

Therefore, you will need 29.1 ml of HCl to make a 3% solution of acid alcohol:

Amount of HCl = 3 x 970/100 = 29.1 ml

You can also calculate the amount of HCl you need by using a ratio and proportion. Let x represent the amount of HCl you need.

95% ethanol : 3% acid alcohol :: 970 ml : x

By solving the proportion, you can determine that x is equal to 29.1 ml.

Thus, you will need 29.1 ml of HCl to make a 3% solution of acid alcohol when starting with 970 ml of 95% ethanol.

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Answer:

Water has high surface tension, and water molecules stick together

Explanation:

Answer: C and D

Explanation: Please give brainlyest

The phenomenon of the 'periodic changes in the shape of Earth's orbit' likely caused ice ages in the past (Option A).

The ice ages are periods in the geological past in which temperature drastically decreased over thousands of years, which may be due to different factors such as Earth's orbital changes, volcanoes, modification in the ocean currents, amount of solar radiation, increase in the CO₂ and global warming, etc

In conclusion, the phenomenon of the 'periodic changes in the shape of Earth's orbit' likely caused ice ages in the past (Option A).

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Answer:

D. A federal government agency publishes an article in a professional scientific journal detailing technical details of a  new virus.

Explanation:

Public scientific communication is a way used by scientists to make the audience able to understand the basics of science to communicate an informed decision. There are several skills under public scientific communication that include connect with the public, talk to journalists, make science understandable, and understand the audience.

The best way to connect with the audience is to publish an article in a professional scientific journal because mostly journals are peer-reviewed having standard of quality.

A federal government agency informing about a  new virus through an article in a professional scientific journal is the best way of public scientific communication as it will be for a specific audience along with a standard of quality.

Hence, the correct answer is "D".

Answer:

13.5 moles Ne

Explanation:

Atoms --> Moles

1. Put the given number over 1

2. Multiply by 6.022x10^23 to get to moles

3. Round by sigfigs

(8.15x10^24 atom Ne(g)/1) (1 atom Ne(g)/6.022x10^23molesNe)=13.5337...

13.5337 --> 13.5 moles Ne

Answer:

Explanation:

Na2O has 2 atoms of Sodium and 1 atom of Oxygen

So, the molecular mass of Na2O is:

(2 x Atomic weight of Na) + (1 x Atomic weight of O)

Atomic weight of Na = 22.99 g

Atomic weight of O = 16 g

Therefore, Molecular Mass of Na2O = (2x 22.99g) + (1 x 16g)

= (45.98 + 16)g = 61.98 g

Therefore 61.98 g of Na2O contains 6 x 10^23 molecules (Avogadro's number).

24.6 g of Na2O therefore contains:

(24.6/61.98) x 6 x 10^23 = Answer!

Answer:

The screw with 10 wraps is the correct answer

Explanation:

The screw with 6 wraps would create a strong hold.

The strongest member of the family of wood screws is a lag screw. It is a reliable and sturdy fastener that frequently has a square head or an externally powered hex drive.

In general, lag screws are significantly stronger and heavier than standard wood screws. They have a tapered point and coarse threads.

Thus, The screw with 6 wraps would create a strong hold.

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Answer:1.96 grams per liter

Explanation:To find density you have to divide mass by the volume d=m/v

Now you need to find the mass of the carbon dioxide by 153.77- 144.85= 8.92 grams

Finally all you do is 8.92/4.55= 1.96 grams per liter

A balloon weighing 144.85 g is filled with carbon dioxide and reweighed. The weight of the balloon plus gas is 153.77 g. The volume of the full balloon is 4.55 L the density of carbon dioxide will be 1.96 cm³.

The density of any substance is the amount of the susbtance present at per unit cubic volume of the liquid and it is the ratio of the mass and the volume of the substance and unit will be centimeter cube.

The mass of carbon dioxide = 153.77 g - 144.85 g = 8.92

volume = 4.55 liters.

              density = mass / volume

Substituting the value,

              Density = 8.92 / 4.55 liters.

               Density = 1.96 cm³.

Therefore,  the density of carbon dioxide will be 1.96 cm³ if  A balloon weighing 144.85 g is filled with carbon dioxide and reweighed. The weight of the balloon plus gas is 153.77 g. The volume of the full balloon is 4.55 L

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Answer:

gravity

Explanation:

Gravity is the force that pulls us to the surface of the Earth, keeps the planets in orbit around the Sun and causes the formation of planets, stars and galaxies.

Hope this helped!!!

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

Percent yield is defined as the ratio of the actual yield to the theoretical yield. It is expressed in the form of percentage.

Percent Yield is defined as the ration when the actual yield divided by the theoretical yield times 100. The actual yield of a chemical reaction may be less than the theoretical yield. The percent yield can be expressed as the ratio of the actual yield to the theoretical yield expressed as a percentage. The theoretical yield is defined as the maximum amount of product that can be formed from the given amounts of reactants. The actual yield is defined as the amount of product that is actually formed when the reaction is carried out in the laboratory. It is a measure of the quantity of moles of a product formed in relation to the reactant consumed obtained in a chemical reaction.

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Answer:

No results found for 0.265g of an organic compound produced on evaporation 102cm cube of vapour at 373K and 775mmHg. Percentage composition of the constituent elements are 92.24% C and 7.76% H. Find the molecular mass and molecular formula of the composition..

Results for 0.265g of an organic compound produced on evaporation 102cm cube of vapour at 373K and 775mmHg Percentage composition of the constituent elements are 92.24 C and 7.76 H Find the molecular mass and molecular formula of the composition

Answer:

Using PV=nRT

P=775mmhg/760mmhg

P=1.01atm

so,n=PV/RT

n= (1.01*0.102)/(0.0821*373)

n= 0.00339mole

n =mass/ molecular mass

molecular mass =0.265/0.00339

molecular mass= 78.17

empirical formular = C. H

C= 92.24. 92.24/12= 7.688

H= 7.76. 7.76/1=7.76

therefore Empirical formula is CH

(CH)n=78.16

(12+1)n=78.14

n=78.14/13

n= 6.01

therefore, molecular formula is

C6H6

Answer:

is there any answer choices????

Answer:

The answer is Refraction

a) The collision frequency of dimethyl ether can be calculated using the kinetic theory of gases. The collision frequency is given by the equation:

\(\[\text{{Collision frequency}} = \frac{1}{4} \sqrt{\frac{8 \cdot k \cdot T}{\pi \cdot m}}\]\)

where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the mass of dimethyl ether molecule. Given that the angle-averaged radius of dimethyl ether is 0.25 nm, we can calculate the mass of the molecule using its density or molar mass.

b) To calculate the decomposition rate constant of (CH3)2CO, we need additional information such as the reaction mechanism and reaction conditions. The rate constant for a chemical reaction depends on factors like temperature, activation energy, and the presence of catalysts. Without these details, it is not possible to calculate the decomposition rate constant accurately.

In conclusion, the collision frequency of dimethyl ether at a specific temperature can be calculated using the kinetic theory of gases. However, to calculate the decomposition rate constant of (CH3)2CO, additional information about the reaction conditions and mechanism is needed.

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LEAST TO MOST POLAR- hexane,diethyl ether,acetone,n-propanol,water ,methanol

Considering the problem  we can say that the kids are compared to be more polar or smaller molecular weight compounds. The more polar compounds interact with silica more just as the kids bus stopped at every point and reached the destination late. Whereas, the adult bus is compared to be less polar compounds or high molecular weight which interacts less and reaches the destination faster.

Thus more polar compounds reaches the destination late whereas less polar compound reaches first.

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Choosing the material with the highest specific heat capacity is ideal and true.

This is defined as the quantity of heat needed to raise the temperature per unit mass.

Insulators have a higher specific heat capacity as it takes more time for them to absorb heat thereby making it ideal in building an  insulated home.

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