Help me, I don’t understand

Help Me, I Dont Understand

Answers

Answer 1

Answer:

option c

Explanation:

ffuunkie. tfnhc dhrhrjebrjeieie

Answer 2
opening c
Bssieehskwkbbshsi

Related Questions

Assuming a car (with a 70-L) gas tank can hold approximately 50,000 (5.00 * 10^4) g of octane(C8H18) or 50,000 (5.00 * 10^4) g of ethanol (C2H6O). How much carbon dioxide (CO2), in grams, is produced in one tank of gas from the combustion of each amount?

Answers

Answer:

- From octane: [tex]m_{CO_2}=1.54x10^5gCO_2[/tex]

- From ethanol: [tex]m_{CO_2}=9.57x10^4gCO_2[/tex]

Explanation:

Hello,

At first, for the combustion of octane, the following chemical reaction is carried out:

[tex]C_8H_{18}+\frac{25}{2} O_2\rightarrow 8CO_2+9H_2O[/tex]

Thus, the produced mass of carbon dioxide is:

[tex]m_{CO_2}=5.00x10^4gC_8H_{18}*\frac{1molC_8H_{18}}{114gC_8H_{18}}*\frac{8molCO_2}{1molC_8H_{18}}*\frac{44gCO_2}{1molCO_2} \\\\m_{CO_2}=1.54x10^5gCO_2[/tex]

Now, for ethanol:

[tex]C_2H_6O+3O_2\rightarrow 2CO_2+3H_2O[/tex]

[tex]m_{CO_2}=5.00x10^4gC_2H_6O*\frac{1molC_2H_6O}{46gC_2H_6O}*\frac{2molCO_2}{1molC_2H_6O}*\frac{44gCO_2}{1molCO_2} \\\\m_{CO_2}=9.57x10^4gCO_2[/tex]

Best regards.

50 POINTS!!!! Please Help I'm being timed and this would help so much! 50 POINTS!!!!

Calculate the hydrogen ion concentration [h+] for the aqueous solution in which [oh-] is 1 x 10^-2 mol/l. Is this solution acidic, basic, or neutral? Show your work.

Answers

Answer:

[H⁺] = 1.0 x 10⁻¹² M.

Explanation:

∵ [H⁺][OH⁻] = 10⁻¹⁴.

[OH⁻] = 1 x 10⁻² mol/L.

∴ [H⁺] =  10⁻¹⁴/[OH⁻] = (10⁻¹⁴)/(1 x 10⁻² mol/L) = 1.0 x 10⁻¹² M.

∵ pH = - log[H⁺] = - log(1.0 x 10⁻¹² M) = 12.0.

∴ The solution is basic, since pH id higher than 7 and also the  [OH⁻] > [H⁺].

I think- IDK

What is the binding energy of a mole of nuclei with a mass defect of 0.00084
kg/mol?

Answers

Answer:

7.56 x 10^13 J/mol

Explanation:

Binding energy = (Mass defect) × (velocity of light)² = (84 × 10^-5) × (3 × 10^8)^2 = 756 × 10^11 J = 7.56 × 10^13 J/mol

Hope this helps -Paige

PLEASE HELP ME ANY ANSWER THAT IS SAYING IDK OR SOMETHING LIKE THAT WILL BE REPORTED I NEED HELP OK FIRST TO ANSWER CORRECTLY GETS BRAINLIEST

(Match the term with the definition) In E = mc2,
1)mass
2)kilogram
3)energy
4)joules
5)meters/second
6)speed of light

a)What does E stand for?
b)What does m stand for?
c)What does c stand for?
d)What is the unit for E?
e)What is the unit for m?
f)What is the unit for c?

Answers

Answer:

a → 3

b → 1

c → 6

d → 4

e → 2

f → 5

Hope this helps!

Answer:

a → 3

b → 1

c → 6

d → 4

e → 2

f → 5

Explanation: hope it helps!!

Which phrase describes a volcano that is not expected to erupt again?
quiet volcano
extinct volcano
dormant volcano
explosive volcano

Answers

Volcanoes which are not expected to erupt again is known as Extinct Volcanoes.
Extinct because they aren’t expected to erupt again

There are 0.55 moles of carbon dioxide gas in a 15.0 L container. This container is at a temperature of 300 K. What is the pressure of the gas inside the container? Use 8.31 L*kPa/mol*K for the gas constant.


A.)760 mm Hg\

B.) 271 kPa

C.) 2 atm

D.) 91.4 kPa

Answers

Answer:

[tex]\large \boxed{\text{D.) 91 kPa}}[/tex]

Explanation:

We can use the Ideal Gas Law — pV = nRT

Data:

V = 15.0 L

n = 0.55 mol

T = 300 K

Calculation:

[tex]\begin{array}{rcl}pV & =& nRT\\p \times \text{15.0 L} & = & \text{0.55 mol} \times \text{8.31 kPa$\cdot$ L$\cdot$K$^{-1}$mol$^{-1}\times$ 300 K}\\15.0p & = & \text{1370 kPa}\\p & = & \textbf{91 kPa}\end{array}\\\text{The pressure in the container is $\large \boxed{\textbf{91 kPa}}$}[/tex]

if 31.6 g of KMnO4 is dissolved in enough water to give 160 mL of solution, what is the molarity?
AND
what mass of oxalic acid , H2C204, is required to make 300 mL of a .74 M solution?

Answers

Answer:

A. 1.25M

B. 19.98g

Explanation:

A. Data obtained from the question include the following:

Mass of KMnO4 = 31.6 g

Volume = 160 mL

Molarity =..?

We'll begin by calculating the number of mole KMnO4 in the solution. This is can be obtained as follow:

Mass of KMnO4 = 31.6 g

Molar mass of KMnO4 = 39 + 55 + (16x4) = 158g/mol

Number of mole of KMnO4 =..?

Mole = mass /Molar mass

Number of mole of KMnO4 = 31.6/158 = 0.2 mole

Now, we can obtain the molarity of the solution as follow:

Volume = 160 mL = 160/1000 = 0.16L

Mole of KMnO4 = 0.2 mole

Molarity = mole /Volume

Molarity = 0.2/0.16 = 1.25M

B. Data obtained from the question include the following:

Volume = 300mL

Molarity = 0.74 M

Mass of H2C2O4 =..?

First, we shall determine the number of mole H2C2O4. This is illustrated below:

Volume = 300mL = 300/1000 = 0.3L

Molarity = 0.74 M

Mole of H2C2O4 =?

Mole = Molarity x Volume

Mole of H2C2O4 = 0.74 x 0.3

Mole of H2C2O4 = 0.222 mole

Now, we can easily find the mass of H2C2O4 by converting 0.222 mole to grams as shown below:

Number of mole of H2C2O4 = 0.222 mole

Molar mass of H2C2O4 = (2x1) + (12x2) + (16x4) = 2 + 24 + 64 = 90g/mol

Mass of H2C2O4 =..?

Mass = mole x molar mass

Mass of H2C2O4 = 0.222 x 90

Mass of H2C2O4 = 19.98g

if the [H+] = 0.01 M, what is the pH of the solution, and is the solution a strong acid, weak acid, strong base, or weak base?
12, strong base
2, weak acid
12, weak base
2, strong acid

Answers

Answer:

2, strong acid

Explanation:

Data obtained from the question. This includes:

[H+] = 0.01 M

pH =?

pH of a solution can be obtained by using the following formula:

pH = –Log [H+]

pH = –Log 0.01

pH = 2

The pH of a solution ranging between 0 and 6 is declared to be an acid solution. The smaller the pH value, the stronger the acid.

Since the pH of the above solution is 2, it means the solution is a strong acid.

The enthalpies of formation of the compounds in the combustion of methane, , are CH4 (g): Hf = –74.6 kJ/mol; CO2 (g): Hf = –393.5 kJ/mol; and H2 O(g): Hf = –241.82 kJ/mol. How much heat is released by the combustion of 2 mol of methane? Use .

Answers

Answer:

The amount of energy released from the combustion of 2 moles of methae is 1,605.08 kJ/mol

Explanation:

The chemical reaction of the combustion of methane is given as follows;

CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)

Hence, 1 mole of methane combines with 2 moles of oxygen gas to form 1 mole of carbon dioxide and 2 moles of water vapor

Where:

CH₄ (g): Hf = -74.6 kJ/mol

CO₂ (g): Hf = -393.5 kJ/mol

H₂O (g): Hf = -241.82 kJ/mol

Therefore, the combustion of 1 mole of methane releases;

-393.5 kJ/mol × 1 + 241.82 kJ/mol × 2 + 74.6 kJ/mol = -802.54 kJ/mol

Hence the combustion of 2 moles of methae will rellease;

2 × -802.54 kJ/mol or 1,605.08 kJ/mol.

Answer: answer is C

Explanation:

Just took the test

does gravity affect the orbit of the international space ​

Answers

Answer:

yes

Explanation:gergrgregbfbwerbebw

What does the questions “how much?” and “how many?” have in common?

Answers

They both ask for an amount of something

An organism that has 2 dominant alleles is called... *

homozygous recessive
homozygous dominant
heterozygous recessive
heterozygous dominant
HELP

Answers

Answer:

Homozygous dominant

Explanation:

Please help

What causes a wave to have a higher amplitude?

Answers

Answer:

More energy

Explanation:

Wave amplitude is determined by the energy of the disturbance that causes the wave. A wave caused by a disturbance with more energy has greater amplitude.

Answer:

energy of the disturbance

Explanation:

........ btw bts paved the way I saw you was army and thought I would say that

1 point
If the pressure in a cylinder is 1 atm and the volume is 0.725 liters, then
what is the pressure when the volume is decreased to .075 liters (at
constant temperature)? *
2.5 atm
5 atm
5 atm
9.7 atm
O
13.2 atm

Answers

Answer:

9.7 atm.

Explanation:

The following data were obtained from the question:

Initial pressure (P1) = 1 atm

Initial volume (V1) = 0.725 L

Final volume (V2) = 0.075 L

Final pressure (P2) =?

The final pressure can be obtained by using the Boyle's law equation since the temperature is constant. This is illustrated below:

P1V1 = P2V2

1 x 0.725 = P2 x 0.075

Divide both side by 0.075

P2 = 0.725 / 0.075

P2 = 9.7 atm.

Therefore, the new pressure is 9.7 atm.

what is the compound of scI2

Answers

Answer:

sulfur dichloride

Explanation:

SCl2 is the chemical formula for sulfur dichloride. This compound is made of only two elements, so it is a binary compound.

do all objects emit electromagnetic waves?

Answers

Answer:

no, not all objects emit electromagnet waves.

Explanation: because lets say the object is carpet it has no magnetic waves in it so not all objects do.

If a body was lying on their back when they died, and was moved to their front after 12 hours, where would one see the skin discoloration from pooling blood?

Answers

Answer:the parts of the body which is nearest to  the ground ie thier back will show discoloration

Explanation:

If the body remains at a position for long hours, the parts of the body which is nearest to  the ground can develop a skin discoloration as a result of pooling of blood in the tissues and this is called livor mortis, which tends to be permanent from 8Hours upwards.

In ΔDEF, the measure of ∠F=90°, FE = 16, DF = 63, and ED = 65. What ratio represents the tangent of ∠E?

Answers

Answer:

63/16

Explanation:

tanE=  

adjacent

opposite

​  

=  

16

63

Answer:

63/16

Explanation:

this for delta math?

Which one is it? Please help

Answers

Chemical properties can only be tested if you change the substance

Answer:

Chemical properties can be tested without changing the substance

Explanation:

A compound is 2.00% H by mass, 32.7% S by mass, and 853% O by mass. What is its empirical
formula?
The final step is to use the mole ratios of the elements to write the empirical formula
The mole ratios of the elements are:
mole ratio of H:S:0 = 2:14
The mole ratios show the ratios of the elements in the compound. Use these ratios to identify the
subscripts on each element in the empirical formula Remember that the subscript 1 is not shown
What is the correct empirical formula for this compound?
HSO
H₂SO4
H2SO4

Answers

Answer:

H2SO4

Explanation:

In 100 g of the compound we hgave

2.00 g H, 32.7 g S and 65.3 g O.

2g* 1 mol/g = 2.0 mol H

32.7 g S * 1 mol/32.1 g = 1.02 mol S

65.3 g 0 * 1 mol/16 g = 4.08 mol O

2.0 mol H : 1.02 mol S : 4.08 mol O = 2 mol H : 1 mol S : 4 mol O

H2SO4

Answer:

H2SO4

Explanation:

The teacher made a 0.5M solution. How is this number read/said?

Answers

Answer:

It reads as follows: 0.5 moles of solute per liter of solution.

Explanation:

Molarity is the most frequent way of expressing the concentration of solutions in chemistry, and it indicates the number of moles of solute dissolved per liter of solution; is represented by the letter M.

You are given the reaction Cu + HNO3 Cu(NO3)2 + NO + H2O complete the final balanced equation based on half-reactions

Answers

The balanced equation based on half-reactions is 2Cu + 8HNO3 + 6H+ -> 2Cu(NO3)2 + 2NO + 4H2O.

How to determine the balanced equation based on half-reactions

To complete the balanced equation for the given reaction Cu + HNO3 -> Cu(NO3)2 + NO + H2O using half-reactions, we need to break down the overall reaction into separate oxidation and reduction half-reactions.

1. Oxidation Half-Reaction:

Cu -> Cu2+ + 2e-

In this step, copper (Cu) is oxidized, losing two electrons to form copper(II) ions (Cu2+).

2. Reduction Half-Reaction:

HNO3 + 3H+ + 2e- -> NO + 2H2O

In this step, nitric acid (HNO3) is reduced, gaining two electrons to form nitric oxide (NO) and water (H2O).

Now, to balance the half-reactions, we need to make sure that the number of electrons gained in the reduction half-reaction is equal to the number of electrons lost in the oxidation half-reaction. In this case, we can achieve this by multiplying the oxidation half-reaction by two.

Balanced Half-Reactions:

Oxidation: 2Cu -> 2Cu2+ + 4e-

Reduction: HNO3 + 3H+ + 2e- -> NO + 2H2O

Finally, we can combine the balanced half-reactions to obtain the balanced equation for the overall reaction:

2Cu + 8HNO3 + 6H+ -> 2Cu(NO3)2 + 2NO + 4H2O

Therefore, the balanced equation based on half-reactions is 2Cu + 8HNO3 + 6H+ -> 2Cu(NO3)2 + 2NO + 4H2O.

Learn more about oxidation at https://brainly.com/question/25551544

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Determine whether these statements describe Geiger counters, scintillation counters, both, or neither. An amplifying device that indicates the presence of ionizing particles A device that permits determination of alpha and beta radiation emitted from a substance Film sensitive to radiation that is removed and developed to measure exposure A device used for monitoring individual cumulative exposure to ionizing radiation

Answers

Answer:

An amplifying device that indicates the presence of ionizing particles  

GEIGER COUNTERS

A device that permits determination of alpha and beta radiation emitted from a substance  

BOTH

Film sensitive to radiation that is removed and developed to measure exposure  

NEITHER

A device used for monitoring individual cumulative exposure to ionizing radiation  

NEITHER

Explanation:

1. Geiger counters and scintillation counters can be described by statements 1 and 2.

2. Statement 3 refers to film-based radiation detectors, not Geiger counters or scintillation counters.

3. Statement 4 refers to dosimeters, not Geiger counters or scintillation counters.

1. An amplifying device that indicates the presence of ionizing particles: This statement describes both Geiger counters and scintillation counters. Both types of counters use amplifying devices to detect and indicate the presence of ionizing particles.

2. A device that permits determination of alpha and beta radiation emitted from a substance: This statement describes both Geiger counters and scintillation counters. Both types of counters are capable of detecting alpha and beta radiation.

3. Film sensitive to radiation that is removed and developed to measure exposure: This statement describes neither Geiger counters nor scintillation counters. Instead, it refers to film-based radiation detectors, such as photographic film or thermoluminescent dosimeters (TLDs), which are used to measure radiation exposure.

4. A device used for monitoring individual cumulative exposure to ionizing radiation: This statement describes neither Geiger counters nor scintillation counters.

Know more about ionizing particles:

https://brainly.com/question/12206417

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An example of a double replacement chemical reaction takes place in batteries. In an alkaline battery, Manganese oxide reacts with water to form a different manganese oxide and hydroxide. Which is the correct balanced equation for this?

Answers

Answer:

2MnO2 + H2O => Mn2O3 + 2OH is the correct balanced equation.

When manganese oxide reacts with water to form a different manganese oxide and hydroxide, the correct balanced equation for this is 2MnO₂ + H₂O ⇾ Mn₂O₃ + 2OH.

What do you mean by balanced chemical equation ?

The term balance chemical equation is define as the equation which satisfy the law of conservation of mass, i.e., “Total mass of the products is equal to the total mass of all the reactants”.

If a chemical equation is not balanced, it will break the law of conservation of mass. It will indicate that either mass is created or destroyed, which is impossible.

Balanced chemical equations have the equal number and type of each atom on both sides of the equation.  

Thus, When manganese oxide reacts with water to produce a different manganese oxide and hydroxide, the correct balanced equation for this reaction is 2MnO₂ + H₂O ⇾ Mn₂O₃ + 2OH.

To learn more about the balanced chemical equation, follow the link;

https://brainly.com/question/28294176

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Which statements describe gridlines on a map? Select three options. They are measured in degrees. They set up a reference system. They make straight lines on a globe. They run north to west and south to east. They divide Earth into four equal parts.

Answers

Answer:

The options that apply to the description of grid-lines of the map are;

They are measured in degrees

They set up a reference system

They divide Earth into four equal parts

FIRST OPTION , SECOND OPTION and FIFTH OPTION are correct.

Explanation:

FIRST OPTION gave the describtion that the grid-lines of the map are measure in degrees,this option is applied to the gridlines on a map because the grid are lined as a result of angular measurement which makes it to makes the unit to be measured degrees and angles.

SECOND OPTION described it as been set up by a reference system which let us know that the area that are plotted were all grid as a result of the size

FIFTH OPTION also applied to the

description of the gridlines on a map because the Earth is divided into 4 equal parts through the Prime Meridian i.e the latitudinal line and longitudinal line .

.

Answer:

They are measured in degrees.

They set up a reference system.

They divide Earth into four equal parts.

Explanation:

i took the test

Convert 4.6 atm to mmHg.

Answers

It’s
3496 you can google this you know

how many number of electrons are in aluminium and nitrogen in their free state?​

Answers

Answer:

MRCORRECT has answered the question

Explanation:

13 electrons

So... for the element of ALUMINUM, you already know that the atomic number tells you the number of electrons. That means there are 13 electrons in a aluminum atom. you can see there are two electrons in shell one, eight in shell two, and three in shell three.

7 electrons

So... for the element of NITROGEN, you already know that the atomic number tells you the number of electrons. That means there are 7 electrons in a nitrogen atom. Looking at the picture, you can see there are two electrons in shell one and five in shell two.

please help me please

Answers

Answer:

b

Explanation:

i read this once and remember,trust me!

Answer:

20 is b and 21 is a.

How do American cities now protect their water resources

Answers

They can use man made materials or they can also have designed areas that people can’t go into

Answer:

They can use man made materials or they can also have designed areas that people can’t go into

Explanation:




The balloon in this image was rubbed with a piece of wool material. Now, it is negatively charged. What force allows the charged balloon to "pick up" the small pieces of paper off of the table?



The negatively charged balloon is attracted to negative static charges in the paper..



The negatively charged balloon is attracted to the north pole of the paper pieces.



The negatively charged balloon is attracted to the south pole of the paper pieces.



The negatively charged balloon is attracted to the positive static charges in the paper.


What is the best explanation of electric current in a wire?



Electrons build up in the wire and create a charge.



Electrons flow because of electrical attraction and repulsion.



Protons are pushed along by electric forces.



Atoms move because of heat.


Why does the light bulb in a circuit turn on when you close the switch?



The switch absorbs the electrical energy.



The switch changes the direction of the flow of electrons.



Closing the switch completes the circuit, making it a closed circuit.



The switch changes the circuit from series to parallel.


Earth is dipolar, like a bar magnet.


What does this mean about its magnetic poles?



There is only a magnetic south pole.



There is only a magnetic north pole.



There are both magnetic north and south poles.



There are two magnetic north poles.



Which arrangement described below would result in magnetic poles that attract one another?


North Pole + South Pole


South Pole + West Pole


East Pole + North Pole


North Pole + North Pole



Why is an electromagnet a temporary magnet?




An electromagnet only attracts other permanent magnets.




An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.




An electromagnet cannot be turned on and off.




An electromagnet is a magnet when no current flows through the wire. The electromagnet no longer acts as a magnet when current flows through the wire.



What set of materials listed below could be used to create a complete electromagnet?



wires and battery




iron nail and battery




iron nail, magnet, and wire




battery, iron nail, copper wire



Where is a bar magnet's magnetic field the strongest?



red part of the magnet



longest part of the magnet



magnetic poles (N + S)



center of the magnet



A(n) ___________ is represented in the diagram it converts electrical energy into mechanical motion.


generator


electromagnet


parallel circuit


motor

Answers

Answer:

I actually have no idea

Explanation:

Sorry my man

Answer:

Explanation:

generator

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Westernization refers to countries adopting the culture and values of.....A)western Europe and North America.B)the American "Wild West."C)the western portions of East Asia.D)Japan and China. A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow-up calls to a few randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 70%88%. A. What does this mean? For each conclusion, state whether it is correct or not and explain why. Complete parts a through e below. B. Between 62% and 78% of all orders arrive on time. State whether the conclusion is correct or not and explain why. Choose the correct answer below. PLEASE HELP WILL MARK BRANLIESTSelect the correct stages.Identify the ways in which carbon is added to the atmosphere. A number cube is rolled 12 times and lands on 3 four times and on 5 three times. Find the experimental probability of landing on three. *In 1-2 complete sentences: What is something you have liked about reading The Great Gatsby? What is something you don't like or have struggled with? Be specific! A population of deer mice was introduced into a desert ecosystem. Being dark-colored, the deer mice stood out in the sand and were easy prey for predators. Over a few years, the color of the mice changed from dark brown to light brown. What role does natural selection play in this example? I need help with this art question the link is going to be in chat I need help uwuwuwuwuwuauauuwuwuauaua Most of Northern Africa is covered by the growing _____ Desert.MojaveKalahariSaharaGobi What is the denotation of the word "strong" in this context?O powerfulO muscularO courageousO skilled When a phosphocreatine molecule binds to an ADP molecule to create ATP, which energy pathway is at work?creatine phosphate pathway citric acid pathway glycolytic pathway glycogenic pathway 5. Ms. Peregrino is using her cards to call onstudents in period 7. She has 34 students.She has 2 girls with the same name. What is the probability of Ms.peregrino calling in those girls with the same name one after the other? Explain the importance of the Ganges River system for the people of India and BangladeshSave and ExitNextSubmit Solve this Inequality, show work if you can, Thanks!! What does the 13th Amendment to the US Constitution do?A. It allows all men 21 or older to be able to vote in the United StatesB. It allows for the direct election of Senators to the CongressIt bans slavery in the United StatesC. It allows the federal government to tax citizen's income What is the area of the kite? Speaker 1 - Man in blue shirtSpeaker 2 - Man in yellow shirtView the image above and observe the nonverbal communication of both speakers. What messages are these speakers conveying? Use at least 5 specific examples to discuss the messages conveyed by their appearance; their posture, gestures and movement; as well as their eye contact and facial expressions. The primary source of energy in the cells is a nutrient called Write the expression: 3 divided by the sum of x and 9. A) 3 + 9 x B) x 3 + 9 C) x + 9 3 D) 3 x + 9 Express this number in standard form.2.077 x 10-41 ?4