A substance has a melting point of 80 °C. Which of the following is true for the substance? (5 points)

a) It will also change from a liquid to a gas at 80 °C while the liquid loses energy.

b) It will also change from a liquid to a gas at 80 °C while the liquid gains energy.

c) It will also change from a liquid to a solid at 80 °C while the liquid gains energy.

d) It will also change from a liquid to a solid at 80 °C while the liquid loses energy.

Answers

Answer 1

Answer:

D

Explanation:

The liquid loses energy while being cooled. It therefore changes to a solid when the liquid is cooled from a temperature above 80°C to 80°C

Answer 2

A substance has a melting point of 80 °C.  It will also change from a liquid to a solid at 80 °C while the liquid loses energy and the correct option is option D.

At the substance's melting point of 80 °C, it undergoes a phase transition from a liquid to a solid. During this transition, the substance loses energy to the surroundings as it releases heat to form a solid structure. The process is called solidification or freezing.

As the substance cools down from a higher temperature to 80 °C, its molecules lose kinetic energy, and they arrange themselves into a more ordered and stable lattice, resulting in the formation of a solid. This release of energy is why the liquid loses energy during the transition. Once the substance reaches 80 °C, it remains at this temperature until the entire amount has solidified.

Thus, the ideal selection is option D.

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Related Questions

A graduated cylinder is filled to 12.5 mL
with water and a piece of tin is placed
in the cylinder, displacing the level to
16.8 mL.
What is the volume of the tin piece in
cubic centimeters?
[?] cm³
Record your answer to the tenths place.
Volume (cm³)

Answers

The volume of the tin piece in cubic centimetres is 4.3 cm³

What is a graduated cylinder?

A graduated cylinder is a standard piece of laboratory glassware used to measure the volume of an object or amount of liquid. As its name indicates, it is a glass cylinder with marks along the side similar to those on a measuring cup.

When adding an object to a liquid, the displayed volume difference corresponds to the volume of the added object.

In this way, to find the value of the object's volume, subtract the initial volume from the final volume:

16.8ml - 12.5ml = 4.3ml

To convert to cubic centimetres, the conversion scale of volume and length measurements need to be used, finding that mL is equal to cubic centimetres. So, the final answer is:

4.3 cm³

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Take a small amount of water and milk in two different but similar container's. Freze them by putting them in a refrigerator .NOw melt them,in the sunshine,boil them on the same stove under the same condition ,and evaporate them completely .note there time during changing of their states .what similarities and differences you find while changing the states of noth of the materials

Answers

All liquids evaporate if exposed to certain elements.

What is Evaporation ?

Evaporation is the process by which water changes from a liquid to a gas or vapor.

Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor.

All liquids evaporate if exposed to certain elements.

The rate at which a liquid evaporates depends on its molecular structure.

The other factors that affect evaporation are surface area, temperature and air movement.

We can also do a few fairly simple experiments to demonstrate the effect that the various factors have on the rate of evaporation.

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Which of the following is a double replacement reaction?
K2S + CoCI2 -> 2KCI + CoS
Ca + 2H2O -> Ca (OH)2 + H2
CaO + H2O -> Ca(OH)2
2KCIO3 -> 2KCI + 3O2

Answers

The reaction that exemplifies a double replacement reaction is as follows: K2S + CoCI2 -> 2KCI + CoS, which is option 1.

What is a double replacement reaction?

A double replacement reaction is a type of reaction in which two elements are substituted in the reacting compounds.

In the reaction given as follows:

K2S + CoCI2 -> 2KCI + CoS

Pottasium replaces cobalt in Cobalt chlorideSulfur replaces chlorine in Cobalt chloride

Therefore, the reaction is a type of double replacement reaction.

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How many liters of a 0.80 M
solution can be made with 2.0 mol
KNO3?

Answers

Answer: 2.5

Explanation: you devide mol solute which is 2.0 and the L solution which is 0.80M, and after you divide the two you get 2.5

i also had this question <3

The molarity is an important method to calculate the concentration of a solution. The volume of potassium nitrate of 0.80 molarity and 2.0 mol moles is  2.5 L.

What is molarity?

The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is mainly employed in calculating the molarity of a binary solution. It is represented as 'M' and unit is mol L⁻¹.

The equation used to calculate the molarity is given as:

Molarity = Number of moles of the solute / Volume of the solution in litres

Here molarity = 0.80 M

Number of moles = 2.0 mol

Then the volume of the solution =  Number of moles of the solute / Molarity

Volume = 2.0 / 0.80 = 2.5 L

Thus the volume of the solution is 2.5 L.

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What causes ionic bonding between two atoms?

Answers

Answer:

Ionic bonding happens when an atom of an element gives one or more of its electrons to the other element's atom..it usually takes place between metal and non metal atoms...like in NaCl, Na gives its valence electron to chlorine and completes its own octet. Chlorine accepts the electron and completes its own octet too...but now both the atoms have an opposing charge and hence they attract each other to form an IONIC bond.

Ionic bonds are the strongest of the bonds...here complete transfer of electrons takes place unlike covalent bonds.

HOPE IT HELPED..

:)

Answer:

The electrostatic interaction between an anion and cation

Please answer one question. thanks so much if u do
What is the substance produced by a chemical reaction called?
a) Reactant
b) Product
c) Resultant
d) Reagent
e) Summation

What kind of chemical reaction involves oxygen and another substance producing water and carbon dioxide?
a) Synthesis reaction
b) Decomposition reaction
c) Combustion
d) Single displacement
e) Photochemical reaction

What does a catalyst do to a chemical reaction?
a) Stops the reaction
b) Starts the reaction
c) Speeds up the rate of reaction
d) Slows down the rate of reaction
e) None of the Above

Answers

Answer:

b) Product

c) Combustion

c) speeds up the rate of reaction

Explanation:

the substance produced by a chemical reaction is called a product (b)

Combustion (c) reactions are involving oxygen and "another substance" [and hydrocarbons] to produce carbon dioxide and water.

A catalyst acts to speed up the rate of a reaction (c)

 > note how it "speeds up" reaction: , it [a catalyst] lowers the pressure or temperature needed to start one--but it isn't used/consumed in the reaction

So, the answers are: b, c, c

hope this helps!!

The answer is b product

10.5 mL of an unknown solution are diluted to 80.0 mL. The concentration of the
new solution was determined to be 0.172 M. What was the molarity of the
unknown solution? (Report your answer to two places past the decimal point.
Moodle is looking for a number only, no units.)

Answers

The molarity of the unknown solution will be 1.310 M.It is denoted by M₂.

What is molarity?

Molarity is defined as the ratio of the moles to the volume of the solution.

Given data;

Volume of unknown solution,V₁ = 10.5 mL

The volume of diluted solution,V₂ = 80.0 mL

Molarity of new solution,M₁ = 0.172 M

Molarity of unknown solution, M₂=?

For dilution we use the formula as;

M₁V₁=M₂V₂

M₂=M₂V₂/V₁

M₂ = ( 80 × 0.172 ) / 10.5

M₂= 1.310 M

Hence the molarity of the unknown solution will be 1.310 M.

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What is the mass in grams of 4.85 x 10^22 Al atoms? (Report your answer to two places past the decimal

Answers

Answer:

2.17 gm Al

Explanation:

First, find the number of moles .   Then multiply by the mole weight of aluminum.

# moles =   4.85 x 10^22 / 6.022 x 10^23 = .08053 moles

.0805 moles * 26.981 gm/mole  = 2.173 gm

What mass of sodium chloride (nacl) forms when 7.5 g of sodium carbonate (na2co3) reacts with a dilute solution of hydrochloric acid (hcl)? type in your answer using the correct number of significant figures. na2co3 2 hcl → 2nacl h2o co2 7.5 g na2co3 = g nacl

Answers

Answer:

8.3 g of NaCl

Explanation:

Edge 2022

Answer:

8.3 g NaCl

Explanation:

Its right just type it in

How many individual Ni atoms are contained in 1.25 grams of Ni? (Input your answer with scientific notation using "e-notation" and report your answer to two places past the decimal point.

Answers

Answer:

Ni atoms are contained in 1.25gram is 1.28e22 atoms.

Explanation:

Ni atoms are contained in 1.25gram is 1.28e22 atoms.

We have a Nickel(Ni)  atom . The atomic number of Ni is 28 .It is a silvery-white metal with a slight golden tinge. Ni belongs to the transitional metal series.

The electronic configuration of Ni = Ar4d⁸35²

Nickel is slowly oxidized by air at room temperature.

Nickel is a ferromagnetic element at approximately room temperature.

To answer the problem , we first need to divide by the molar mass of Ni to get the moles of Ni. And then we will multiply by Avogadro's number to find the number of Ni atoms.

Molar mass of Ni = 58.7gm

Given mass of Ni = 1.25gm

Avogadro’s No. = 6.022 × 10²³ atom/mole

                    Moles of Ni = Given mass/Molecular mass

                                          = 1.25/58.7 = 0.0213

                    Moles of Ni = 0.0213

Now ,

       Number of Ni atom = Avogadro’s number × Moles

So that,

                No. of Ni atom = 6.022 × 10²³× 0.0213

                                            = 0.128 ×10²³  atoms

                                           = 1.28 × 10²² atoms

                                           = 1.28e22

So there are 1.28 × 10²² individual Ni atoms are contained in 1.25 grams of Ni.

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How many liters of a 0.80 M
solution can be made with 2.0 mol
KNO3?
{?} L

Answers

Answer:

Explanation:

Solution

Verified by Toppr

2 molL

−1

Explanation :

Concentration =

Volume of solution

Moles of solute

We assume that potassium nitrate dissolves in the given volume of solvent without gross change in volume.

Concentration =

101.10gmol

−1

404g

Use the periodic table to answer the questions below.
Which diagram shows the correct electron
configuration for nitrogen (N)?
N N N1
1s
2s
2p
NN ILL
1s 2s
2p
N N
1s
2s
DONE✔
2p

Answers

The diagram that show the correct electron configuration is the second option. ⬆⬇1s,  ⬆⬇2s, ⬆⬆⬆2p.

What is electronic configuration?

The electronic configuration is the representation of electron present indifferent energy levels is an atom. The different type of orbitals are s, p, d, and f.

Thus, the correct option is 2, ⬆⬇1s,  ⬆⬇2s, ⬆⬆⬆2p.

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The molecular structure of water has an asymmetrical arrangement of hydrogen atoms causing.

Answers

Answer:

the asymmetrical arrangement of hydrogen atoms in a molecule of water causes the molecule to be polar, with the hydrogen atoms having a slightly positive charge, and the oxygen atom having a slightly negative charge.

50 atoms, 15 were isotope A, 30 were isotope B, and 5 were isotope C, which isotope would be the most abundant?

Answers

The most abundant isotope among the given Isotopes will be Isotope B

How to calculate percentage abundance of isotopes ?

To calculate the percent abundance of each isotope in a sample of an element, we usually divide the number of atoms of a particular isotope by the total number of atoms of all isotopes of that element and then multiply the result by 100.

For  Isotope A ;

% Abundance =  15/50 x 100

                        =  30 %

For  Isotope B ;

% Abundance =  30/50 x 100

                        =  60 %

For  Isotope A ;

% Abundance =  5/50 x 100

                        =  10 %

Hence, The most abundant isotope among the given Isotopes will be Isotope B.

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A box has dimensions of 2.5 cm by 3.0 cm by 4.0 cm. The volume of the box in milliliters and liters is Group of answer choices 3,000 mL and 3.0 L 30 mL and 30,000 L 7.5 mL and 7,500 L 30 mL and 0.030 L 7.5 mL and 0.0075 L

Answers

Considering the definition of volume, the volume of the box is 30 mL or 0.03 L.

What is volume

Volume is a metric magnitude that is defined as the extension in three dimensions of a region of space. In other words, it is defined as the amount of space occupied by the object or figure in three-dimensional space. Volume is measured in cubic units.

Volume can be considered as the capacity of a container to hold a quantity of fluid (gas or liquid).

Volume of a box

A box is a rectangular prism, which is defined as a prism with rectangular bases and rectangular lateral faces.

The volume of this prism depends on its three dimensions and is calculated as the multiplication of these dimensions:

Volume= Dimension 1× Dimension 2× Dimension 3

Volume of the box in this case

In this case, you know that a box has dimensions of 2.5 cm by 3.0 cm by 4.0 cm. So, the volume can be calculated as:

Volume= 2.5 cm× 3 cm× 4 cm

Solving:

Volume= 30 cm³

Being 1 cm³=  1 mL and 1 L= 1,000 mL then:

Volume= 30 cm³= 30 mL= 0.03 L

Finally, the volume of the box is 30 mL or 0.03 L.

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What does the author predict about the future of the Earth's mantle? Do you support his educated guess? Use complete sentences to answer.

Answers

The earth's mantle will not change in the future because this region is safe from the intervention of human beings.

What happens in the Earth's mantle?

The transfer of heat and material in the mantle helps us to determine the landscape of Earth. Activity in the mantle moves the plate tectonics, that contributes to volcanoes, seafloor spreading, earthquakes, and building of mountains.

So we can conclude that the earth's mantle will not change in the future because this region is safe from the intervention of human beings.

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An ice freezer behind a restaurant has a freon leak, releasing 31.68 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months

Answers

The weight of fluorine released in to the air over 6 month will be 0.365 kg

What is Freon ?

Freon is a non-combustible gas that is used as a refrigerant in air conditioning applications.

This freon undergoes an evaporation process over and over again to help produce cool air that can be circulated throughout your AC system

Total number of weeks = 6 x 4 = 24

Mass leak rate of freon = 31.68 g/week

Mass leak rate of flourine = fluorine mass in freon / molecular mass of freon x leak rate

                                          = 19 x 3 / 118.5 x  31.68

           

                                          =  15.23 gm/week

Total fluorine leak in 6 month = 15.23 x 24 = 365.72 gm = 0.365 kg

Hence, The weight of fluorine released in to the air over 6 month will be 0.365 kg

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Two samples contain sulfur and
oxygen in the amounts shown in the
data table. What is the mass percent
of sulfur in compound B?
Sample Mass S (g) Mass 0 (g)
A
32.0
48.0
B
30.0
30.0

Answers

Answer:

Sample A=40 Sample B=50

Explanation:

32+48=80

32/80x100=40

The 100 is to convert it to a percentage

___________________________

Sample B

same thing

30+30=60

30/60x100=50

The mass percent of sulfur in compound B is 50 %

What is mass percent?

Mass percent is defined as a way of expressing a concentration or describing the component in a particular mixture.

It can also be defined as a mass of a element or solute divided by the mass of compound or solvent.  

Mass percent of sulfur of sample A

= 32 + 48 = 80

= 32 / 80 x 100

= 40 %

Mass percent of sulfur of sample B

= 30 + 30 = 60

= 30 / 60 X 100

= 50 %

Thus, the mass percent of sulfur in compound B is 50 %

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How do you test for hydrogen?

Answers

To test for hydrogen, burn a candle near the suspected source of hydrogen. If you hear a squeaky pop sound, hydrogen is present because when hydrogen gas burns, it makes a squeaky pop sound.

Hydrogen burns with a loud pop in when a burning splint is held near it.

Test for hydrogen

There are a couple of ways to test for hydrogen. However, the simplest and most popular way is to bring a burning splint near a container containing hydrogen gas.

The production of a loud squeaky pop sound indicates the presence of hydrogen gas. All precautions should, however, be observed.

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If 1.32 g MgO is combined with 100.0 mL of 1.00 M HCl in a coffee cup calorimeter, the temperature of the HCl solution increases from 24.2 °C to 34.4 °C. Calculate the enthalpy change for the reaction per mole of MgO. Assume that the specific heat of the HCl solution is 4.18 J/g·°C and its density is 1.00 g/mL.

MgO(s) + 2HCl (aq) MgCl2 (aq) + H2O (l)

Answers

The change in enthalpy for the reaction per mole is -130KJ/mol.

Given,

Reaction: MgO(s) + 2HCl (aq) →MgCl₂ (aq) + H₂O (l)

1.32 g MgO is combined with 100.0 mL of 1.00 M HCl in the cup of coffee.

Change in temperature, ΔT=34.4 °C-24.2 °C =10.2°C

Specific heat of the HCl solution, c= 4.18 J/g·°C

Density= 1.00 g/mL

Mass can be written as the product of density and volume.

Mass= Density × Volume= 1g/ml × 100 ml=100g

Heat can be written as

Heat, Q=mcΔT=100g×4.18 J/g·°C×10.2°C=4263.6J

Number of moles of the MgO,

n= (mass of MgO)/(Molar mass)= 1.32g/(40.3g/mol)= 0.03275 mol

Change in Enthalpy, ΔH=-Q/(n)=(-4263.6J)/(0.03275 mol)

ΔH= -1300186J/mol= -130KJ/mol

Hence, the change in enthalpy for the reaction per mole is -130KJ/mol.

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would mean alot to help

Answers

Answer:

n

Explanation:

nobody knows

Answer: O

Explanation:

Out of the given elements, oxygen has the highest electronegativity.

What does viscosity describe

Answers

The Answer Is The Third Option

can see all wavelengths/photons of light emitted from excited electrons.

Answers

No, all wavelengths/photons of light are emitted from excited electrons.

What is wavelength?

Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.

When an atom's electrons move to a lower energy state, the atom releases energy in the form of a photon. Depending on the energy involved in the emission process, this photon may or may not occur in the visible range of the electromagnetic spectrum.

Hence, no, all wavelengths/photons of light are emitted from excited electrons.

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Which statement best describes how the scientific community analyzes data?
OA. A scientist must always keep his or her data hidden from other
scientists.
B. There is only one possible conclusion to be drawn from a set of
data.
OC. Each scientist must use his or her own, unique data.
OD. Scientists can come to different conclusions based on the same
data.
SUBMIT

Answers

Answer: D. Scientists can come to different conclusions based on the same data.

scientists can come to different conclusions based on the same data

Which statement best describes how changing the temperature of a solution
affects the rate of reaction?
A. Increasing the temperature of a solution increases the
concentration of the reactants.
B. Decreasing the temperature of a solution increases the rate of
reaction.
C. Increasing the temperature of a solution increases the rate of
reaction.
D. Decreasing the temperature of a solution increases the
concentration of the reactants.

Answers

C. increasing the temperature of a solution increases the rate of reaction.

This is because increasing the temperature gives particles more kinetic energy, thus resulting in more effective collisions.

Discuss how varying ph of water affects the soil ph which in turn would affect the durability properties of reinforced concrete as a constituent material?

Answers

Although soils are capable of resisting pH changes, there are some circumstances where the pH of the water can result in alterations.

Will Soil pH Be Affected by Water pH?

The texture of soil affects how susceptible it is to the pH of the surrounding water. Smaller soil particles, such as clays and clay loams, have a greater impact than larger, sandier soils. There are more colloids, which are extremely minute particles, in fine-textured soils. Positively charged ions are maintained at these colloids. The cation exchange capacity of a soil refers to its capacity to hold onto these ions. Ions on the colloidal particles trade places with ions in the soil solution. The pH of the soil is less affected by negative ions in the soil solution.

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Write the half reaction equations at the cathode and anode

Answers

A redox reaction is one in which oxidation and reduction occurs.

What is a redox reaction?

A redox reaction is one in which oxidation and reduction occurs. Oxidation involves electron loss while reduction involves electron gain.

For the compound NaI;

The oxidation half equation is - 2Na(s)  --->2Na^+(aq) + 2e

The reduction half equation is - I2 + 2e ---->2 I^-(aq)

Missing parts:

Write the anode half-reaction and cathode half-reaction for NaI.

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which of these changes are endothermic and which are exothermic

baking a cake
bending a plastic ruler
cutting paper
melting ice cream
ripening of fruit
souring of milk

Answers

Answer:

exothermic - bending a plastic ruler , cutting paper, melting ice cream, ripening of fruit, souring of milk.

Explanation:

endothermic- baking of cake .

Exothermic is all of them besides baking a cake that’s endothermic

which type of scientist would most likely study how the size of the lemming population affects the size of the snowy owl population?
A. A biologist
B. A sociologist
C. A chemist
D. A physicist
HELP PLS

Answers

The type of scientist would most likely study how the size of the lemming population affects the size of the snowy owl population is a biologist.Thus, the correct option is (D)

What Biologist does ?

Biologists study humans, plants, animals, and the environments in which they live.

They may conduct their studies--human medical research, plant research, animal research, environmental system research--at the cellular level or the ecosystem level or anywhere in between.

Hence, The type of scientist would most likely study how the size of the lemming population affects the size of the snowy owl population is a biologist.Thus, the correct option is (D)

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GIVING 17 POINTS PLS HELP ME!!!!
Which of the following statements is true about hydropower?
A. It releases carbon dioxide.
B. It can produce harmful chemicals.
C. It can affect fish and other marine life.
D. It uses gas trapped under Earth's surface.

Answers

Hydropower can affect fish and other marine life which is the true statement and is denoted as option C.

What is Hydropower?

This is the process in which water energy is converted into electrical energy through the use of dams and turbines.

When the dams are created, it blocks the path of marine activities and limits them to certain activities such as reproduction.

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The cost of renewable energies has increased over the last decade A. true B. False What is the inverse of this function?8v, for x > 0 This video clip is a good example of ________________. Group of answer choices pianist playing melody and comping with a Swing Feel pianist playing melody and comping with a Modern Groove/Straight 8th Feel pianist playing melody and comping with a Bossa Nova Feel pianist playing melody and comping with a Samba Feel Suppose that the lifetimes of tires of a certain brand are normally distributed with a mean of 74000 miles and a standard deviation of miles. these tires come with a -mile warranty. the manufacturer of the tires can adjust during the production process, but the adjustment of is quite costly. the manufacturer wants to set once and for all so that only of the tires will fail before warranty expires. find the standard deviation to be set. carry your intermediate computations to at least four decimal places. round your answer to at least one decimal place. What is the approximate length of the radius, r? use 3.14 for . round to the nearest inch. 12 inches 24 inches 38 inches 46 inches Covert 3/7into a percent What explains the difference between retail and commercial banking?- Commercial banks loan money to small businesses, while retail banks loan money to large corporations.- Retail banks loan money to small businesses, while commercial banks loan money to large corporations.- Commercial banks help small businesses make capital purchases, while retail banks help big businesses invest.- Retail banks help big businesses make capital purchases, while commercial banks help consumers invest. What is a key way of learning about different cultures? What is the role of RNA polymerase?Which molecule brings amino acids to the ribosomes to be assembled into proteins? Sarah and her friends split a bag of candy evenly. They each ate 13 pieces of candy and there are 2 pieces leftover. How many pieces of candy were originally in the bag? Given the first degree function f(x) = 2x +3, what is the value of f(10)?a) 23b) 25c) 30d) 50 What can you conclude about communication, culture shock, and adjustment that would be useful for teachers? Determine the most precise name for ABCD (parallelogram, rhombus, rectangle, or square). Explain how you determined your answer. You must support your answer using length or slope. A(3, 5), B(7, 6), C(6, 2), D(2, 1) The force of gravity between two objects is greatest when the objects have? Brainliest to first decent answerWhat is the chemical formula for the molecule represented by the model?CHO C4H9O2C4H8OC3H8O2 What is the main conflict in this excerpt? snowball wants to build the windmill, but napoleon thinks that other matters are more important. Napoleon believes that the farm does not need to be defended if others rebel, but snowball disagrees. Snowball thinks that other farms are a threat, but napoleon is more worried about mr. Jones. Napoleon wants the animals to protect themselves, but snowball wants to encourage revolts elsewhere. Select the correct text in the passage.Which statement best shows Brutus's message that Caesar's death was best for Rome?Julius Caesarby William Shakespeare(excerpt from Act 3, Scene II)In the prior acts of Julius Caesar, noble Romans have conspired against their leader, Caesar, and assassinated him. In this scene, Brutus, awell-respected man and longtime friend of Caesar, addresses the people of Rome to explain his participation in the act.BRUTUS: If there be any in this assembly, any dear friend ofCaesar's, to him I say that Brutus' love to Caesarwas no less than his. If then that friend demandwhy Brutus rose against Caesar, this is my answer:-Not that I loved Caesar less, but that I lovedRome more.Had you rather Caesar were living anddie all slaves, than that Caesar were dead, to liveall free men? As Caesar loved me, I weep for him:as he was fortunate, I rejoice at it; as he wasvaliant. I honor him: but, as he was ambitious, Islew him. There is tears for his love, joy for hisdeathe kestele 54-90.27-90.22-90.87-90 Why were the people giving bribes and taking it called the enemy of the nations? what is the probability that a family with three children will have all girls?A) 1/2B) 1/8C) 25%D) .10