Which element is in the lanthanide family?

Answer:

See Explanation

Explanation:

In electrolysis, a solution called the electrolyte is decomposed by the passage of direct current through it.

The points through which current enters and leaves the electrolyte are called electrodes. In electrolysis, oxidation occurs at the anode and reduction occurs at the cathode.

In the electrolysis of water; at the anode oxygen is produced as follows;

4OH^-(aq) -----> 2H2O(l) + O2(g) + 4e

Answer:

H2

Explanation:

I would say H2 cause CH4 have less hydrogen gas .

At standard temperature and pressure conditions, both the balloons have equal grams of gas.

Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.

Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.

These values are important to physicists, chemists ,engineers ,pilots and navigators.

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Answer:

A continuous color sequence is a pattern that can be used to determine if paint chips are missing from the set. If the color change from chip to chip is not continuous, a chip is probably missing. This pattern is useful to display paint chips for customers.

Answer:

200J

Explanation:

This is because 500J - 300J = 200J

I hope this helps!!!

Answer:

1700 Joules. I Took the test.

Explanation:

Answer:

It takes 86 days take to cover half of the lake

Explanation:

In the day #1, the amount of the algae is X,

In the day #2 is 2X

In the day #3 is 2*2*X = X*2²

...

In the day #n the amount of the algae is X*2^(n-1)

Assuming X = 1m³. In the day 87, the area infected was:

1m³*2^(87-1)

7.74x10²⁵m³ is the total area of the lake

the half of this amount is 3.87x10²⁵m³

The time transcurred is:

3.87x10²⁵m³ = 1m³*2^(n-1)

Multiplying for 5 in each side:

ln (3.87x10²⁵) = ln (2^(n-1))

58.9175 = n-1 * 0.6931

85 = n-1

86 = n

Answer:

100 grams of C-14 decays to 25 grams in 11,460 years.

The C-14 isotope is only useful for dating fossils up to about 50,000 years old

If an ancient bone contains 6.25% of its original carbon, then the bone must be 22,920 years old.

Explanation:

We already know that the half life of C-14 is 5,730 years. After the first half life, we have 50 grams remaining. This takes 5,730 years. After the second half life (11,460 years now gone) we have 25 grams of C-14  left.

If a fossil material is  older than 50,000 years an undetectable amount of 14C is left in the sample hence Carbon-14 is no longer suitable for dating the sample.

From;

0.693/5730 = 2.303/t log (No/0.0625No)

Where;

t = time taken and No = initial amount of C-14

0.693/5730= 2.77/t

t = 22,920 years

Answer:

Density of cube = 1.59 × 10-⁴ kg/cm³

Explanation:

From the question, the dimensions of the cube are as follows:

Iength, l =0 .045 m, width, w = 0.45dm, height, h = 4.5 mm.

It's mass is 1.45 X 104 mg. What is this cube's density in Kg/cm?

First, all units of length are converted to cm and mass is converted to Kg.

L = 0.045 m = 0.045 m × 100 cm/m = 4.5 cm;

W = 0.45 dm = 0.45 dm × 10 cm/dm = 4.5 cm

Since it is a cube, the height, h = 4.5 cm not 4.5 mm

Mass of cube = 1.45 × 10⁴ mg = 1.45 × 10⁴ mg × 1 × 10-⁶ kg/mg = 0.0145 kg

Density = mass/volume

Volume of cube = s³ or l × w × h

Volume of cube = 4.5 cm × 4.5 cm × 4.5 cm = 91.125 cm³

Density of cube = 0.0145 kg / 91.125 cm³

Density of cube = 1.59 × 10-⁴ kg/cm³

False. The given statement The molal boiling-point and freezing-point constants are different for different solvents is wrong.

Depression at the Freezing Point. A solution's freezing point is lower than that of the pure solvent. This indicates that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.

The number of solute molecules dissolved in one kilogram of the solvent is known as the molality of the solution, and it is directly inversely related to the drop in freezing point.

The effect of adding a solute to a solvent affects a solution's freezing point in the opposite way that it affects its boiling point. The freezing point of a solution will be lower than that of a pure solvent. The temperature at which a liquid turns into a solid is known as the freezing point.

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Answer:

Thank youuuuu bestie, you really pulling through

Answer:

yessss

Explanation:

Answer:

See explanation below

Explanation:

1) Total Revenue:

Total revenue refers to the total amount of income that is generated when a company sells or offers their service.

It is usually calculated as the product of the product or services sold by the quantity.

It is calculated by ;

TR = Q * P

Where TR = Total Revenue

Q = Quantity

P = Price

2.) Average Revenue:

Average revenue is the revenue gotten by a company per unit of output sold. It is calculated by:

AR = TR / Q

Where AR = Average Revenue

TR = Total Revenue

Q. = Quantity

3.) Marginal Revenue:

This is the net revenue that is generated by selling an additional unit of commodity; which is the change in total revealer unit. It is calculated by:

MR = change in Total Revenue / change in Quantity

Where MR = Marginal Revenue

4.) Gross Profit:

Gross profit is the amount of revenue left after factoring out the cost of production and sales and servicing.

It is calculated by subtracting revenue from the cost of goods sold -

Gross Profit = Revenue - Cost of goods sold

Net Profit:

Net profit is the amount of money a company has left after subtracting all interests, tax expenses and cost.

It is calculated by;

Net Profit = Gross Profit - Expenses

Answer:

it is a practical question..ASAP

Answer:

To calculate the amount of heat released we have equation, use the equation Q = mc ΔT,

where

m= 35g

c= 2.46 J/g°C

ΔT=T2-T1 = 78-25= 53°C

now Q = mcΔT

Q = 35×2.46×53

Q = 4563.3 joule

Conclusion 4563.3 Joules of energy are transferred from the stove burner to the ethanol to create this temperature change!

Answer:

C

Explanation:

increasing T (knowledge of direct proportion and Inverse proportion)

Answer:

[tex]T_{EQ}=37\°C[/tex]

Explanation:

¡Hola!

En este caso, para los problemas de equilibrio térmico, consideramos que la energía liberada por la sustancia que inicialmente está caliente (agua), es absorbida por la sustancia que inicialmente está fría (alcohol); thus, we can write:

[tex]Q_{agua}=-Q_{alcohol}[/tex]

La cual puede ser escrita en términos de masa, calor specifico y temperaturas:

[tex]m_{agua}C_{agua}(T_{EQ}-T_{agua})=-m_{alcohol}C_{alcohol}(T_{EQ}-T_{alcohol})[/tex]

De este modo, al resolver para la temperature de equilibrio térmico, obtenemos la siguiente expresión:

[tex]T_{EQ}=\frac{m_{agua}C_{agua}T_{agua}+m_{alcohol}C_{alcohol}T_{alcohol}}{m_{agua}C_{agua}+m_{alcohol}C_{alcohol}}[/tex]

Así, al reemplazar los valores en esta, obtenemos:

[tex]T_{EQ}=\frac{(20g)(1cal/g\°C)(40\°C)+(15g)(0.58cal/g\°C)(30\°C)}{(20g)*(1cal/g\°C)+(15g)(0.58cal/g\°C)} \\\\T_{EQ}=37\°C[/tex]

¡Saludos!

Answer:

Orbital motion occurs whenever an object is moving forward and at the same time is pulled by gravity toward another object. ... The result is a circular or oval path called an orbit, in which one object keeps moving around the other. Because of the relatively great gravity of the sun, Earth orbits the sun

Answer:

maybe falling

Explanation:

Air is a force so its probably pushing down the object then making it fall

I think all objects? Not entirely sure.

Answer: If one mole of carbon monoxide has a mass of 28.01 g and one mole of carbon dioxide has a mass of 44.01 g , it follows that the reaction produces 44.01 g of carbon dioxide for every 28.01 g of carbon monoxide.

Explanation: (May Be Unrelated?)

Human use of land has negative impacts. Human activities contribute to the erosion and pollution of beaches. Deforestation of land can also lead to desertification and a loss of biodiversity.

Answer:

B. Ca

Explanation:

Let's look at the electron configurations of all four elements (I am going to write it in noble gas configuration to make it simpler):

Mg electron configuration: [Ne]3s2

Ca electron configuration: [Ar]4s2

Ar electron configuration: [Ar]

K electron configuration: [Ar] 4s1

We notice that Ca has two electrons in the 4s sublevel, which satisfies what the question is asking for.

The answer is thus B. Ca.

Answer:

July 23

Explanation:

Kinetic energy is an energy present in the object with motion. When the water freezes then the speed of the molecules decreases. Thus, option A is accurate.

Kinetic energy is possessed by an object when it is in moving motion and because of the molecules. When the temperature decreases the movement of the molecule decreases.

The decrease in the kinetic energy results in a gain of potential energy and release of heat in the surrounding. The temperature and the kinetic energy are directly proportional and affect the speed of the molecules.

Therefore, the freezing of water results in decreased speed of the water molecule.

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Answer:

Zinc has more power although iron has a stong bond with metal

Explanation:

Brainliest answer?

Answer:

Zinc has more negative electrode reduction potential than iron. Zinc is more easily oxidized than iron, zinc has a lower reduction potential.

Explanation:

it should be carbon dioxide and water