Consider the following balanced chemical reaction: 2 H2(g) + CO (g) -> CH4O (1). If
6.12 g of H₂ reacts with excess CO, how many grams of CH4O can be produced?
Select one:
a. 16.5g
b. 27.29
c. 64.5g
d. 48.6 g
e. 75.8 g

Answers

Answer 1

Answer:

d

Explanation:

2H₂(g) +CO(g) → CH₄O (l)

Since H₂ was reacted with excess CO, H₂ is the limiting reagent. This means that the amount of product formed is dependent on the amount, i.e. the number of moles, of H₂.

The number of moles of H₂ can be calculated by taking the mass divided by its Mr (relative molecular mass).

Mr of H₂= 2(1)= 2

Moles of H₂ (g)

= 6.12 ÷2

= 3.06 mol

From the balanced equation, 2 moles of H₂(g) produces 1 mole of CH₄O(g).

Since we have 3.06 moles of H₂(g),

Moles of CH₄O (l) produced

= 3.06 ÷2

= 1.53 mol

Mr of CH₄O

= 12 +4 +16

= 32

Mass= mole ×Mr

Mass of CH₄O (l) produced

= 1.53(32)

= 48.96 g

Thus, d would be the best option.


Related Questions

which of these is/are conserved during a chemical reaction ?
a)Mass only
b) Charge only
c)both mass and charge
d)neither

Answers

Answer:

C- both!

Explanation:

In a chemical reaction, the total mass and total charge has to be balanced on both sides of the "equation", therefore both are conserved

The rate law for the reaction 3A --> 2B is rate = k[A] with a rate constant of 0.0447 hr-1.
What is the half-life of the reaction?
A) 0.0224 hr
B) 0.0645 hr
C) 15.5 hr
D) 22.4 hr
E) 44.7 hr

Answers

The half-life of the reaction is determined as 22.4 hr.

Half life of the reaction

The half life of the reaction is calculated as follows

rate of reaction, k = Δ[A]/3t = Δ[B]/2t

t = Δ[A]/3k = Δ[B]/2k

where;

k is rate constant = 0.0447/hr

t = (3)/(3 x 0.0447) = (2)/(2 x 0.0447) = 22.4 hr

Thus, the half-life of the reaction is determined as 22.4 hr.

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Which most likely describes results from their experiments? tristan and arya would exert more energy to overcome friction than anoush and keran. tristan and anoush would exert more energy to overcome friction than arya and keran. tristan and keran would exert less energy to overcome friction than arya and anoush. tristan and arya would exert less energy to overcome friction than anoush and keran.

Answers

The statement that most likely describes the results from their experiments is Tristan and Arya would exert more energy to overcome friction than Anoush and Keran. Thus, the correct option is A.

What is Friction?

Friction may be characterized as the force that counters the proximate motion between two surfaces of objects when they reach to contact.

According to the question, Tristan is working with static friction and Arya is working with sliding friction; static friction operates on things when they are catnapping on a surface, whereas sliding friction functions on objects when they are gliding over a surface.

Sliding friction is much more fragile and weaker than static friction and is comparatively uncomplicated and utilizes less energy to drag the objects.

The complete question is as follows:

Four students are doing different friction experiments with a cylinder.

Tristan is working with static friction,Arya is working with sliding friction,Anoush is working with rolling friction,Keran is working with fluid friction.

Therefore, the correct option for this question is A, i.e. Tristan and Arya would exert more energy to overcome friction than Anoush and Keran.

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If you know that lithium reacts strongly with oxygen in a 2:1 ratio, which of
the following properties would you predict about cesium

Answers

Answer:

Same as lithium

Explanation:

Lithium and Ceaseum both are group one elements i.e alkali metals

So they have same chemical properties almost

Hence Ceaseum would react with oxygen in 2:1 ratio

What volume in milliliters of 0.0150 M Ba(OH)2 is required to neutralize 50.0 mL of 0.0500 M HBr?​

Answers

The volume of [tex]Ba(OH)_2[/tex] required will be 83.33 mL

Stoichiometric reactions

The equation of the reaction is as follows:

[tex]Ba(OH)_2 + 2HBr --- > 2H_2O + BaBr_2[/tex]

Mole ratio of reactants = 1:2

Mole of 50 mL, 0.05 M HBr = 0.05 x 0.05 = 0.0025 moles

Equivalent mole of  [tex]Ba(OH)_2[/tex] = 0.0025/2 = 0.00125 moles

Volume of 0.015 M, 0.00125 moles  [tex]Ba(OH)_2[/tex] = 0.00125/0.015 = 0.0833 L

0.0833 L = 83.33 mL

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You have prepared an aqueous solution of a monoprotic acid (formula mass = 153.483g/mol) by dissolving 26.816g of the acid in sufficient water to make 500.0mL of solution. The pH of the resulting solution is 4.274. What is Ka for this acid?

Answers

The Ka of the solution is 8.1 * 10^-9.

What is the pH?

The pH of a solution is the concentration of hydrogen ions in the solution.

Number of moles of the acid =  26.816g/153.483g/mol = 0.175 moles

Concentration of the acid =  0.175 moles/0.5 L = 0.35 M

Now we know that the acid reacts with water as follows;

HA(aq)  + H2O(l) ------> H3O^+(aq) + A^-(aq)

[H3O^+] = Antilog (-4.274)

[H3O^+] = 5.32 * 10^-5 M

Since;

[H3O^+]  = [A^-] = x

Ka = x^2/[HA]

Ka = (5.32 * 10^-5)^2/( 0.35)

Ka = 8.1 * 10^-9

Hence, the Ka of the solution is 8.1 * 10^-9.

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How many molecules are in 84.7 grams?

Answers

The number of molecules will depend on the molar mass of the compound.

Number of molecules

According to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex].

To find the number of moles in a substance:

Mole = mass/molar mass.

In this case, we do not know the compound but we know the mass. Hence, we cannot know the molar mass.

Assuming the molar mass is X.

Mole = 84.7/X

Number of molecules in 84.7 grams of the compound =

              84.7/X x 6.022 x [tex]10^{23}[/tex] molecules.

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Which group on the periodic table has the most reactive metals?
A.
group 1
B.
group 3
C.
group 18
D.
group 17

Answers

Answer:

A  group 1

Explanation:

Group 1

reactivity decreases as you go from L to R or downward on the periodic table

Show all work:
A saturated solution of the Ca(OH)2 is prepared and allowed to equilibrate at 25°C. A 32.40ml
sample of the solution is titrated with 0.050M HCL solution. 14.90mL of the HCI solution are
required to fully react with the sample.

Write the balanced equation for the reaction of the salt with HCl

Answers

The equation of the reaction is;

Ca(OH)2(aq) + 2HCl(aq) ------> CaCl2(aq) + 2H2O(l)

What is neutralization?

The term neutralization has to do with the process in which an acid reacts with a base to form salt and water only. A neutralization reaction is known by the fact that water is obtained by the reaction of hydrogen and hydroxide ions.

The equation of the reaction is;

Ca(OH)2(aq) + 2HCl(aq) ------> CaCl2(aq) + 2H2O(l)

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The table describes how some substances were formed.

Substance
Description
P
Formed by boiling pure water
Q
Formed by combining three hydrogen atoms to every nitrogen atom
R
Formed by adding 5 g of sugar to 1 L of water
S
Formed by compressing carbon under high pressure

Based on the given descriptions, which substance is most likely a mixture?
P
Q
R
S

Answers

R is the mixture formed by adding 5 g of sugar to 1 L of water.

Which is a mixture?

A mixture is an impure substance made up of two or more substances which are miscible or immiscible in each other.

Dissolving the sugar in the water makes a homogenous mixture and once dissolved a solution is made by the combination of a solute (sugar) and solvent (water).

Hence, R is the mixture formed by adding 5 g of sugar to 1 L of water.

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How much heat would need to be removed to
cool 215.1 g of water from 25.6°C to -10.7°C?

Answers

Answer:

100 KJ

Explanation:

yep yep cool is that correct

I NEED HELP! A rigid cylinder contains 3.00 liters of gas at a temperature of 25°C. If the pressure of this gas is changed from
0.500 atmospheres to 1.50 atmospheres, what will be the new temperature of the gas? (R= 0.0821 Latm/mol K)
O 612 °C
894 °C
99.3 °C
885 °C
O 75.0 °C

Answers

Gay Lussac's Law

P₁/T₁=P₂/T₂

25°C = 25+273 = 298 K

0.5/298 = 1.5/T₂

T₂ = 894 K = 621 °C

A gas law known as Gay-Lussac's law asserts that a gas's pressure (when kept at a constant volume and mass) varies directly with its absolute temperature. The new temperature is 612 °C and the correct option is A.

When the mass is fixed and the volume is constant, the pressure a gas exerts is proportional to the temperature of the gas. In the year 1808, French scientist Joseph Gay-Lussac created this law. Gay-Lussac's law can be expressed mathematically as follows:

P₁ / T₁ = P₂ / T₂

25°C = 25 + 273 = 298 K

0.5 / 298 = 1.5 / T₂

T₂ = 894 K

T₂ = 894-273

T₂  = 621 °C

Thus the correct option is A.

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The _______ effect means water can "climb" up thin tubes and water plants. This is due to the ______ nature of water.

Answers

The Capillary effect means water can "climb" up thin tubes and water plants. This is due to the surface tension nature of water.

Hope this helps:)

The capillary effect means water can "climb" up thin tubes and water plants. This is due to the adhesive nature of water.

The capillary effect is a phenomenon where liquids, like water, can rise against gravity in narrow tubes or spaces, such as the stems of plants. This effect is possible due to the adhesive nature of water, which allows it to stick to the walls of the tube or surface it comes into contact with.

The cohesive forces between water molecules create a sort of "pull" that allows the water to climb up the tube, defying gravity. This property is essential for plants, as it helps them transport water and nutrients from their roots to their leaves and other parts of the plant, supporting their growth and survival.

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57.A cofactor is a(an)
a. catalyst for chemical reactions in a living system.
b. protein molecule whose primary function is transport of insoluble molecules in the
bloodstream.
C.
d.
e.
molecule that is acted on by a catalyst.
biological molecule used for storage of energy.
organic or inorganic molecule or ion necessary for proper functioning of some
biological catalysts.

Answers

A cofactor is an organic or inorganic molecule or ion necessary for proper functioning of some biological catalysts (option E).

What is a cofactor?

A cofactor in biochemistry is a molecule that binds to and regulates the activity of a protein.

A cofactor is a metal or coenzyme responsible for the functioning of an enzyme and must be present.

Therefore, a cofactor is an organic or inorganic molecule or ion necessary for proper functioning of some biological catalysts.

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How many grams of Al are needed to react with 63.0 g of FeO

Answers

The amount of Al required will be 15.77 grams

Stoichiometric problem

First, the equation of the reaction:

[tex]2Al +3 FeO -- > Al_2O_3 + 3Fe[/tex]

The mole ratio is 2:3.

Mole of 63.0 g of FeO = 63/71.84 = 0.8769 moles

Equivalent moles of Al = 0.8769 x 2/3 = 0.5846 moles

Mass of 0.5846 moles Al = 0.5846 x 26.98 = 15.77 grams

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Taking into account the reaction stoichiometry, 13.28 grams of Al is required to react with 63 grams of FeO.

Reaction stoichiometry

In first place, the balanced reaction is:

2 Al + 3 FeO → 3 Fe + Al₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Al: 2 molesFeO: 3 molesFe: 3 molesAl₂O₃ : 1 mole

The molar mass of the compounds is:

Al: 27 g/moleFeO: 71.85 g/moleFe: 55.85 g/moleAl₂O₃ : 102 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Al: 2 moles ×27 g/mole= 54 gramsFeO: 3 moles ×71.85 g/mole= 215.55 gramsFe: 3 moles ×55.85 g/mole= 167.55 gramsAl₂O₃ : 1 mole ×102 g/mole= 102 grams

Mass of Al required

The following rule of three can be applied: If by reaction stoichiometry 215.55 grams of FeO react with 54 grams of Al, 53 grams of FeO react with how much mass of Al?

[tex]mass of Al= \frac{53 grams of FeOx54 grams of Al}{215.55 grams of FeO}[/tex]

mass of Al= 13.28 grams

Finally, 13.28 grams of Al is required to react with 63 grams of FeO.

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Which of the following ions is formed when an acid is dissolved in a solution?
OH+
0-
OH-
OSO4²+

Answers

Answer:

The ion that is formed when an acid is dissolved in a solution is OH-.

Explanation:

An acid is a molecule that donates hydrogen ions, or protons, to another molecule. In solution, the acid dissociates, or breaks apart, to form hydrogen ions and the negatively-charged anion of the acid. The anion of a typical acid is the molecule minus the hydrogen ions, so it is OH- for hydrochloric acid, HCl.

When aqueous solutions of calcium bromide and potassium carbonate are combined, solid calcium carbonate and a solution of potassium bromide are formed. The net ionic equation for this reaction is:

(Use the solubility rules provided in the OWL Preparation Page to determine the solubility of compounds.)

(screen shot is attached ) please help

Answers

[tex]K_2CO_3 + CaBr_2[/tex] → [tex]KBr + CaCO_3[/tex]  is the net ionic equation for this reaction.

What is an ionic equation?

An ionic equation is a synthetic equation where electrolytes are composed as separated particles.

[tex]K_2CO_3 + CaBr_2[/tex] → [tex]KBr + CaCO_3[/tex] is the net ionic equation for this reaction.

A balanced ionic equation. shows the reacting ions. in a chemical reaction. These equations can be used to represent what happens in precipitation reactions.

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If a sample of Cl2 gas in a 1000 mL container is exerting a pressure of 14.2 atm, how many grams of chlorine are present? The temperature of the container is 256 K.

Answers

Taking into account the ideal gas law, the mass of chlorine present is 47.9284 grams.

Ideal gas law

An ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

where

P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas.

Mass of chlorine present

In this case, you know:

P= 14.2 atmV= 1000 mL= 1 LT= 256 KR= 0.082 [tex]\frac{atmL}{molK}[/tex]n= ?

Replacing in the ideal gas law:

14.2 atm× 1 L = n× 0.082 [tex]\frac{atmL}{molK}[/tex]× 256 K

Solving:

(14.2 atm× 1 L)÷ (0.082 [tex]\frac{atmL}{molK}[/tex]× 256 K)= n

0.676 moles= n

Being the molar mass of chlorine Cl₂ 70.9 g/mole, the mass of the compound can be calculated as:

0.676 moles× 70.9 g/mole= 47.9284 grams.

Finally, the mass of chlorine present is 47.9284 grams.

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What temperature would constitute a fever for a child? What effects on dental treatment would a fever pose?

Answers

Answer:

38

Explanation:

that I believe is correct

the roof of a building is 0.2km^2. during a rainstorm, 5.5 cm of rain was measured to be sitting on the roof. what is the mass in kg of the water on the roof after the rainstorm? (density of rainwater = 1g/ml)

Answers

The mass in kg of the water on the roof after the rainstorm is mathematically given as

The mass of the water on the roof after a rainstorm is 1.1 *10^{10}g  or 1.1*10^{7}kg

What is the mass in kg of the water on the roof after the rainstorm?

Generally, the equation for the Area of the roof is  mathematically given as

[tex]A=0.20 \times 10^{10} \mathrm{~cm}^{2}[/tex]

height of the rain =5.5cm

the volume of the rain on the roof =1.1 * 10^{10} CC

Generally, the equation for mass is  mathematically given as

mass=volume*density

[tex]&=\left(1.1 \times 10^{10} \mathrm{cC} \times 1 \mathrm{~g} / \mathrm{cc}\right) \\&=1.1 \times 10^{10} \mathrm{~g}[/tex]

In conclusion, the Mass of the water on the roof after a rainstorm is 1.1 *10^{10}  or $1.1*10^{7}

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What is the half-life in minutes of a compound if 75.0 percent of a given sample decomposes in 40.0 minutes? Assume first-order kinetics.

Answers

Answer:

See below

Explanation:

.75 = 1/2^(40/h)      

log .75 / ( log 1/2) = 40 / h

h = half life =   96.37683 min

To solve this type of question we must know the concept of rate law. The half-life of a compound is 23 years for 75% of a given sample of the compound decomposes in 40 minutes.

What is the expression for rate law for first order kinetics?

There are two kinds of rate law in chemical kinetics one is differential rate law and other is integrated rate law

The rate law for first order kinetics is

[tex]k=\frac{2.303}{t}log\frac{a}{a-x}[/tex]

Where

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x - amount left after the decay process

The expression for the half-life of the compound is

[tex]t_{1/2} = \frac{0.693}{K}[/tex]

Where k is the rate constant

t = 40 minutes

a = 100 g

a-x = 100 g - 75g = 25 g

(Since it is given that 75% of the given compound decomposes)

Then,

[tex]k=\frac{2.303}{40}log\frac{100}{25}[/tex]

=0.03years⁻¹

[tex]t_{1/2} = \frac{0.693}{0.03}[/tex]

=23 years

Therefore, the half-life of the given compound is 23years.

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The sugar fructose contains 40.0% C, 6.7% H, and 53.3% O by mass. A solution of 11.7 g of fructose in 325 g of ethanol has a boiling point of 78.59 °C. The boiling point of ethanol is 78.35 °C, and Kb for ethanol is 1.20 °C/m. Assuming ideal solution behavior, what is the molecular formula of fructose?

Answers

The molecular formula of fructose is C₆H₁₂O₆.

What is the molecular formula of fructose?

The molecular formula is derived in the following steps:

Step 1. the molality of the solution is determined first

Molality = Change in boiling point/Kb

Molality = (78.59 - 78.35)/1.2 = 0.2 molal

Step 2. Moles of solute is determined.

Moles of solute = molality * mass of solvent (kg)

moles = 0.2 * 0.325 = 0.065

Step 3. Molar mass of fructose = mass/moles

Molar mass of fructose = 11.7/0.065 = 180 g/mol

Step 4: Mole ratio of constituent elements

Carbon = 40% * 180/12 = 6

Hydrogen = 6.7% * 180/1 = 12

Oxygen = 53.3% * 180/16 = 6

Therefore, the molecular formula of fructose is C₆H₁₂O₆.

In conclusion, the molecular formula of fructose is derived from the molality of the solution.

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A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is __________ L at 423 K and 1.00 atm.

Answers

Considering the combined law, the volume of the sample is 81.639 L at 423 K and 1.00 atm.

Charles's law

Charles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law says that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases while if the temperature of the gas decreases, the volume decreases.

Mathematically, Charles's law states:

[tex]\frac{V}{T}=k[/tex]

Boyle's law

Boyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant. That is, if the pressure increases, the volume decreases while if the pressure decreases, the volume increases.

Mathematically, this law is expressed as:

P×V= k

Gay-Lussac's law

Gay-Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant. This law says that the pressure of a gas is directly proportional to its temperature: if the temperature increases, the pressure will increase, while if the temperature decreases, the pressure will decrease.

Mathematically, Gay-Lussac's law states:

[tex]\frac{P}{T}=k[/tex]

Combined law equation

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{VxP}{T}=k[/tex]

Considering an initial state 1 and a final state 2, it is fulfilled:

[tex]\frac{V1xP1}{T1}=\frac{V2xP2}{T2}[/tex]

Volume of the sample

In this case, you know:

V1= 57.9 LP1= 1 atmT1= 300 KV2= ?P2= 1 atmT2= 423 K

Replacing in combined law equation:

[tex]\frac{57.9 Lx1 atm}{300 K}=\frac{V2x1 atm}{423 K}[/tex]

Solving:

[tex]V2= \frac{423 K}{1 atm} \frac{57.9 Lx1 atm}{300 K}[/tex]

V2= 81.639 L

Finally, the volume of the sample is 81.639 L at 423 K and 1.00 atm.

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What's electrolysis​

Answers

Answer:

electrolysis is the process by which electric current is passed through a substance to effect a chemical change

Calculate the molecular mass of a 2.66g sample of gas at a temperature of pressure of 845torr and occupying a volume of 0.70L.

Answers

The molecular mass of a 2.66g sample of gas at a temperature of pressure of 845torr and occupying a volume of 0.70L is 84.16g/mol.

How to calculate molecular mass?

The molecular mass can be calculated by first calculating the number of moles using the following formula:

PV = nRT

Where;

P = pressureV = volumen = no of molesR = gas law constantT = temperature

1.112 × 0.7 = n × 0.0821 × 300

0.7784 = 24.63n

n = 0.032mol

molecular mass = 2.66g ÷ 0.032mol

molecular mass = 84.16g/mol

Therefore, the molecular mass of a 2.66g sample of gas at a temperature of pressure of 845torr and occupying a volume of 0.70L is 84.16g/mol.

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Question 1 of 25 Hydrogen gas can be produced using this equilibrium reaction. Which change would drive this process toward the product side? C + H₂O CO + H₂ + energy A. Removing the H₂O as it forms B. Increasing the temperature C. Removing the C as it forms D. Removing the CO as it forms SUBMIT​

Answers

What we need to do to drive the equilibrium to the products side is removing the CO as it forms.

What is the equilibrium position?

The equilibrium position is dependent in the conditions of the reaction. We know that the direction to which the equilibrium is shifted can be altered by manipulating the parameters of the reaction.

Now the reaction is; C + H₂O -----> CO + H₂ + energy. The case in point here is to drive the equilibrium position towards the products side.

What we need to do to drive the equilibrium to the products side is removing the CO as it forms.

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Which three words best describe the composition of the inner planets?solid, smooth, giantrocky, solid, densegiant, dense, gaseousgaseous, smooth, small

Answers

The three words which best describe the composition of the inner planets are rocky, solid, and dense.

What is an inner planet?

A planet classified as an inner planet is one that is rocky, solid, and dense by nature, such as Mercury, Venus, Earth, and Mars. Inner planets are those that are nearest to the Sun.

There are two types of planets:

Based on astronomical information and records, there are two main types of planets :

Outer planetInner planet

The moons of the inner planets are either absent or limited to one (Earth) or two (Mars). The inner planets don't have any rings. The inner planets have shorter orbits around the Sun than the outer planets, but they all rotate more slowly.

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Answer:rocky soild and dense

Explanation:

kinetic energy is proportional to what

Answers

Answer:

mass and the square of the magnitude of velocity.

Explanation:

It requires 334 kJ of heat to melt 1 kg of ice. The largest known iceberg had a volume of about 3.1 x 1013 m³. How much heat was required
to melt the iceberg if 1 m³ of ice has a mass of 917 kg?

Answers

The  amount of heat required to melt the iceberg at 9.58 * 10¹⁸ kJ.

What is the amount of heat required to melt an iceberg that has a volume of about 3.1 x 1013 m³?

The heat required to melt a unit mass of ice is known as the latent heat of fusion.

The latent heat of fusion of ice of 1 kg= 334 kJ of heat

Mass of iceberg = 3.1 x 10¹³ m³ * 917 kg = 2.8427 * 10¹⁶ kg

Amount of heat required = 2.8427 * 10¹⁶ * 334 = 9.58 * 10¹⁸ kJ.

Therefore, the amount of heat required to melt the iceberg at 9.58 * 10¹⁸ kJ.

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For this same exercise, if 2.5 liters of this solution (2,500 ml) are administered in a 24-hour interval, what amount in grams of glucose did the patient receive in one day? the glucose to dissolve is 50 grams

Answers

Answer:

j

Explanation:

becaisdbyhe wrl is so not goood

Other Questions
Calculate the energy for the transition of an electron from the n = 2 level to the n = 5 level of a hydrogen atom. 4. What is the figure on the left handing out and to whom?andrew carngie factorise 25x^2-20xy-21y^2+10yz-z^2 I REALLY NEED HELP WITH THESE GRADIENT QUESTIONSPLS HELP ILL GIVE BRAINLIEST which statement best describes historical criticism Imagine that the Earth's size shrunk by a factor of 5.70 from a radius of 1120 km to a radius of 6370 km. However, Earth's mass has remained the same at 5.981024 kg. If a person's mass is 80.7 kg, calculate their weight before and after Earth's shrinkage in Newtons and pounds Indian nationalism was influenced by print, zaid is a nationalist opposing the british rule in india and is convinced that print will enable his views to be spread far and wide. zaid is mostly interested that his views can be read by majority and not just by a few well-educated citizens, this makes him to decide for a medium to be used to express himself, what particular press zaid will use to spread to his opinion. How effective are police officer body camera initiatives impacting on policing leadership and officer accountability? Explain. Which action will cause the magnetic force to push two magnets closer together? In that video I was talking in. ( Or ) in that video that I was talking in. Which grammar is correct? what is internet? write down the requirements to established internet. Determine the quadrant ( I, II, III, and IV ) or axis (x and y ) where each of the following point is located.1. ( 0,-6 ) 2. ( 15,4 )3. ( 100, -5 ) 4. ( 0.004, .05 ) 5. ( -4,0 )8. ( -7.5, -6.3 )9. ( 0.1000) In which two ways did the new deal programs impact the structure of the us A hydroelectric power station (dam) turns energyfromintoA. Gravitational; ElectricalB. Kinetic; electricalC. Kinetic; gravitationalO D. Gravitational; Kinetic I need help please I can't figure this out What is the name of the proceeding in which the homeowner files suit in the courts after paying taxes under protest when he is challenging the assessed value of his home Which of the following statements about critical periods in the growth of a child is false: Group of answer choices they are also known as readiness periods they are times of particular sensitivity to environmental stimuli they occur very early in a child's life mastering a give skill during a critical period ensures optimal development Suppose that a child is typically noncompliant when asked to do a particular task. The teacher, therefore, asks the child to perform three tasks in succession that the child likes to do, and then asks the child to perform the task on which he is noncompliant. As a result of this procedure, the child performs all four tasks. This illustrates: 19. For the following exercises, use the descriptions of each pair of lines given below to find the slopes of Line 1 and Line 2. Is each pair of lines parallel, perpendicular, or neither?19. Line 1: Passes through (-8, -55) and (10, 89)Line 2: Passes through (9, -44) and (4, -14) class Login: def __init__(self): self.login_name = 'none' self.login_password = 'none' # TODO: Define class method - check_credentials(self, user_login, user_passwd) if __name__ == "__main__": login = Login() timeout = 5 #variable used for login attempts login = input() password = input() # TODO: Create boolean variable that receives return value from # calling check_credentials(login, password) # TODO: Create a loop that will continue until login attempts run out or a successful login is returned # TODO: Create a loop that only allows 5 failed login attempts