How does the presence of coal in Antarctica support Wegener's continental drift hypothesis?

answer

4.64 9 x 8 times

expo

Answer:

gguhg

Explanation:

no te es caso drama me están muy una las y y que las te

Answer: 13.4

Explanation: i guessed it and got it correct on ck-12

STP is the standard pressure and temperature condition of the ideal gas. 0.13 moles of dinitrogen monoxide will be present at STP.

An ideal gas equation is a relation between the pressure, volume with moles, gas constant, and the temperature of the ideal gas. The ideal gas equation is given by,

\(\rm PV = nRT\)

Given at STP,

Pressure = 1 atm

Volume = 300 L

Moles = ?

Gas constant =8.3144598 J per mol per Kelvin

Temperature = 273 K

Substituting values in the ideal gas equation we get:

\(\begin{aligned} \rm n &= \rm \dfrac{ PV}{RT}\\\\&= \dfrac{1 \times 300}{273 \times 8.314}\\\\&=0.1321\end{aligned}\)

Therefore, 0.13 moles of dinitrogen monoxide are produced at STP.

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Answer:

4

Explanation:

Answer:

CH4

Explanation:

if it is wrong, i blame my brain

Answer:

Microscope

Explanation:

Answer:

its a telescope you see stars or plants

Explanation:

Answer

0.02

Explanation:

This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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The energy level of the products is lower than the energy level of the reactants, and energy is released throughout the reaction. (Option A)

Chemical processes known as exothermic reactions generate heat. When heat is transferred from the system to its surroundings, as described, the heat flow q is considered negative. Therefore, the H of reaction is negative for exothermic reaction processes.

Therefore, a reaction is exothermic and its enthalpy will be negative if it releases more energy than it takes in. Consider this as a certain quantity of heat evaporating from (or being removed from) the reaction. Endothermic reactions have positive enthalpies because they absorb or use more energy than they produce.

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The elements are the simplest chemical forms and they cannot be broken down through chemical reactions. There are many elements in the given formulas.

What are elements?

The elements are defined as those substances whose atoms all have the same number of protons. The elements are considered as the building blocks of matter. Each element has an atomic number and a symbol.

Each atom is regarded as an element. The elements create bonds to form molecules. The isotopes are the elements with the same atomic number but different mass numbers.

NaC₂HO₄ - 'N' , 'C', 'H','O'

H₂F₅BLi - 'H','F','B','Li'

He₂PSO₄ - 'He', 'P','S','O'

He₂O₄PH - 'He', 'O','P','H'

Answer

T2 = 7.9 °C

Explanation

Given:

Volume 1 = 8.5 L

Volume 2 = 4.5 L

Temperature 1 = 15.0 °C

Temperature = ?

Required: Final temperature

Solutions:

We use Charles Law to solve this question

V1/T1 = V2/T2

T2 = T1V2/V1

T2 = (15 x 4.5)/8.5

T2 = 7.9 °C

Answer:

pH = 7.30

Explanation:

You can find the pH using the following equation:

pH = -log[H⁺]

In this equation, [H⁺] represents the hydrogen ion concentration. You can plug the given value into the equation and solve to find the pH.

pH = -log[H⁺]

pH = -log[5 x 10⁻⁸]

pH = 7.30

Step 1 - Understanding photosynthesis

Photosynthesis is one of the most amazing chemical processes ever created by nature. Without photosynthesis, our atmosphere would lack oxygen and we, human beings, would not be here discussing its equation.

Photosynthesis is a chemical solution to using sunlight as an energy source: the plants consume CO2 from the atmosphere and water from the soil, thus producing oxygen and glucose (actually, sucrose), thanks to the sunlight.

Step 2 - Stating the equation

As we have seen, CO2 and H2O are the reactants, whereas O2 and glucose (C6H12O6) are the products.

The chemical equation can be represented thus as:

This equation needs to be balanced:

Step 3 - Deciding whether the statement is true or false

Comparing the two equations:

We can see the equation given in the exercise is not the correct overall one. Therefore, this is a false statement.

Answer:

750mL

Explanation:

According to this question, a container which has the capacity to hold 3 L water already has 2.25 L water in it. This means that the container needs (3 - 2.25) = 0.75L to get filled up completely.

However, this question needs the volume of water needed to fill the container in milliliter (mL). To do this, we say;

1L = 1000mL

0.75L = 0.75 × 1000

= 750mL

Therefore, 750mL of water can still be added to fill up the container completely.

Answer:

Kinetic Molecular Theory

Explanation:

The kinetic-molecular theory is a theory that explains the states of matter and is based on the idea that matter is composed of tiny particles that are always in motion. The theory helps explain observable properties and behaviors of solids, liquids, and gases. However, the theory is most easily understood as it applies to gases. The theory applies specifically to a model of a gas called an ideal gas.

Answer:

2.282 atm

P1V1/T1 = P2V2/T2

2.70atm / (50+273) = X/ 273

make x subject of formula

:. X = 2.28 atm

or 2.28 * 1.01 *10⁵ N/m²

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What pH scale number represents a neutral.

The answer is 7

Unitless calculations and rounding the final answer to the proper number of significant figures : a) 3.323   b)  5.8  c)  42.02  d) 15.7025

Significant figures represent the meaningful and reliable digits in a number.

a) 3.41 - 0.086652 = 3.323348

Since both numbers have four significant figures, the final answer should also have four significant figures. Therefore, rounding the final answer to four significant figures gives: 3.323

b) 17.441 / 3 = 5.813666666666666

The least precise value in this calculation is 3, which has only one significant figure. Therefore, rounding the final answer to one significant figure gives: 5.8

c) 21.01 * 2 = 42.02

Both numbers have four significant figures, so the final answer should also have four significant figures. Therefore, the final answer is: 42.02

d) 18.7644 - 3.472 + 0.4101 = 15.7025

All three numbers have five significant figures, so the final answer should also have five significant figures. Therefore, the final answer is: 15.7025.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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Answer: Amount of moles is 0.47 mol

Explanation: Amount of moles n = cV = 0.55 M · 0.85 l = 0.4675 mol

There are 0.4675 moles of KI in 0.85L of a 0.55 M KI solution

WHAT IS MOLARITY?

Molarity is a measure of the concentration of a solution. It is calculated by dividing the number of moles (n) of a solute by the volume of a solution (V)

Molarity = number of moles (n) ÷ volume (V)

According to this question, the molarity of a KI solution with a volume of 0.85L is 0.55 M. Hence, the number of moles of KI in the solution can be calculated as follows:

Molarity = n/V

0.55 = n/0.85

n = 0.55 × 0.85

n = 0.4675 moles

Therefore, there are 0.4675 moles of KI in 0.85L of a 0.55 M KI solution.

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The Pacific Ocean is the largest ocean in the world based on water volume, totaling some 660 million cubic kilometers and is almost equally divided into the North and South Pacific waters.

Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.

The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.

The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.

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answer:when an herbivore eats meat and a carnivore eats the herbivore energy from the eatin meat is passed indirectly to the carnivore.

Answer:

A sodium ion Na+ contains 10 electrons, 11 protons, and 12 neutrons.

Explanation:

Correct statement in the process of balance the equation CH₄+O₂ → CO₂+2H₂O then add coefficient 2 to O₂ on the left side of the equation

Balance reaction is the chemical reaction in which number atom is arranged specific manner which reaction is balanced means all elements in the reaction are balanced with specific number

And the given reaction is

CH₄+O₂ → CO₂+2H₂O then,

Place a coefficient of 2 in front of the O₂ we now have 4O atoms on both sides CH₄+2O₂ → CO₂+2H₂O

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1. Using your knowledge of the Brønsted-Lowry theory of acids and bases, complete the following acid-base reactions and indicate each conjugate acid-base pair.

i. OH + HPO₂ → H₂O + H₂PO₄²⁻

The conjugate acid-base pair is OH/H₂O, HPO₂²⁻/H₂PO₄²⁻

2) Identify the conjugate acid-base pairs in the following reactions. Write A, B, CA, and CB below the appropriate substance.

i. HCO₃⁻ + NH₃ → NH₄⁺ + CO₃²⁻

The conjugate acid-base pair is HCO₃⁻/CO₃²⁻, NH₃/NH₄⁺

ii. HCI + H₂O → H₃O⁺ + Cl⁻

The conjugate acid-base pair is H₂O/OH⁻, HCI/Cl⁻, H₃O⁺/H₂O, Cl⁻/HCI

iii. CH₃COOH + H₂O → H₃O⁺ + CH₃COO⁻

The conjugate acid-base pair is CH₃COOH/CH₃COO⁻, H₂O/OH⁻, H₃O⁺/H₂O

iv. HOCI + NH₃ → NH₄⁺ + ClO⁻

The conjugate acid-base pair is HOCI/ClO⁻, NH₃/NH₄⁺

3. Write the formula for conjugate bases formed by the following acids.

i. HPO₄²⁻ → PO₄³⁻

ii. H₂O → OH⁻

iii. CN⁻ → HCN

iv. HOOC-COO⁻ → HOOCCOOH

4) Write the formula for conjugate acids formed by each of the following bases.

i. H₃O⁺ → H₂O

ii. HCN → H₂CN⁺

iii. NH₃ → NH₄⁺

5. Classify each of the following pH values as acidic, basic, or neutral.

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Answer:

133.34 g/mol

Explanation:

The percent composition of CuBr₂ is approximately 28.46% of Cu and 71.54% of Br.

To determine the percent composition of CuBr₂ (copper(II) bromide), we need to calculate the mass of each element in the compound and then divide it by the molar mass of the entire compound.

The molar mass of CuBr₂ can be calculated by adding up the atomic masses of copper (Cu) and bromine (Br) in the compound. The atomic masses of Cu and Br are approximately 63.55 g/mol and 79.90 g/mol, respectively.

Molar mass of CuBr₂ = (63.55 g/mol) + 2(79.90 g/mol) = 223.35 g/mol

Now, let's calculate the percent composition of each element in CuBr₂:

Percent composition of copper (Cu):

Mass of Cu = (63.55 g/mol) / 223.35 g/mol × 100% ≈ 28.46%

Percent composition of bromine (Br):

Mass of Br = 2(79.90 g/mol) / 223.35 g/mol × 100% ≈ 71.54%

Therefore, the percent composition of CuBr₂ is approximately:

- Copper (Cu): 28.46%

- Bromine (Br): 71.54%

These values represent the relative mass percentages of copper and bromine in the compound CuBr₂.

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