Which 2 minerals are in the group olides?
A. calcite and dolomite
B. hematite and magnetite
C. feldspar and quartz
D. sulfur and galena

Answer: yes the atomic number goes on top of the symbol or does the mass number go on top

Explanation: yes the atomic number goes on top of the symbol or does the mass number go on top

Answer:200

Explanation:

Answer:

the answer is a because thermal energy is heat and the question said that is not a factor of thermal energy so A does not refer to heat

Answer:

c

Explanation:

- The atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

- The atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

The atmospheric pressure in Denver, Colorado, is usually about 84.0 kPa. To convert this pressure to atm and torr units, we can use the following conversion factors:

1 atm = 101.325 kPa

1 atm = 760 torr

First, let's convert 84.0 kPa to atm:

Pressure in atm = 84.0 kPa × (1 atm / 101.325 kPa) ≈ 0.829 atm

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

Next, let's convert 84.0 kPa to torr:

Pressure in torr = 84.0 kPa × (760 torr / 101.325 kPa) ≈ 627.522 torr

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

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The power can differ even if the work done is the same, depending on the time taken to perform the work.

If two persons do the same amount of work, they can have different power values. Power is defined as the rate at which work is done or the amount of work done per unit time. It is calculated by dividing the work done by the time taken to do that work.

Power = Work / Time

Even if the work done is the same, the time taken to complete that work can vary between individuals. Therefore, if one person completes the work in less time compared to the other person, their power will be higher. Conversely, if one person takes more time to complete the same amount of work, their power will be lower.

For example, if person A and person B both lift a weight of 100 kilograms to a certain height, and person A completes the task in 10 seconds while person B takes 20 seconds, person A will have a higher power because they completed the work in less time.

Thus, the power can differ even if the work done is the same, depending on the time taken to perform the work.

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Answer:

the telescope is more powerful than the human eye

Answer:

The telescope magnifies the objects and gathers light from them too.

Explanation:

I just did it on USATestPrep

Answer:

B. All people on the night side of Earth

Explanation:

A lunar eclipse is a phenomenon that occurs when the Earth comes between the Moon and the Sun thereby causing it to cover the Moon with its shadow.  

Simply stated, lunar eclipse takes place when the Moon passes or moves through the Earth's shadow thereby blocking any ray of sunlight from reaching the Moon. Thus, the full moon appears deep red (blood moon).

Also, a lunar eclipse would occur only when the Sun, Earth, and Moon are closely aligned to form a straight line known as the syzygy.

There are three (3) types of lunar eclipse and these are;

1. Total lunar eclipse.

2. Partial lunar eclipse.

3. Penumbra lunar eclipse.

In a nutshell, all people on the night side of Earth can witness a lunar eclipse and have a good view of the Moon.

Answer:

D people in a specific area of Earth’s surface covered by the Sun’s shadow

Explanation:

The temperature that the soup must reach in the next four hours to be cooled properly is 41°F (5°C).

Cooking large batches of food can be a tricky endeavor. It is important to ensure that all food is cooled properly to prevent foodborne illness. In this case, a food worker has safely cooled a large pot of soup to 70°F (21°C) within two hours.

To be cooled properly, the soup must reach a temperature of 41°F (5°C) in the next four hours. This temperature is critical, as it is the safe limit for storing perishable food.

If the temperature is not reached, the soup will not be safe for consumption and must be discarded.

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Answer:

Explanation:

The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. This relationship is known as Henry's Law. According to Henry's Law, the solubility of the gas in the liquid is given by:

C = k * P

where C is the concentration of the gas in the liquid (in g/L), P is the partial pressure of the gas (in kPa), and k is a constant that depends on the gas and the temperature.

To find the solubility of water at a pressure of 150 kPa, we can use the following equation:

C2 = (P2/P1) * C1

where C1 is the solubility of water at a pressure of 90 kPa (0.13 g/L), P1 is the initial pressure (90 kPa), P2 is the final pressure (150 kPa), and C2 is the solubility of water at a pressure of 150 kPa (which we want to find).

Substituting the values into the equation, we get:

C2 = (150/90) * 0.13 g/L

C2 = 0.217 g/L

Therefore, the solubility of water is 0.217 g/L at a pressure of 150 kPa, assuming the temperature remains constant.

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The concentration of ClO⁻ in the mixture is 0.055 M, rounded to two significant figures, calculated with the help of equilibrium constant.

The reaction between HF and ClO⁻ is:

HF + ClO⁻ → HClO + F⁻

The equilibrium constant expression for this reaction is:

K = [HClO][F⁻]/[HF][ClO⁻]

We are given the initial concentrations of HF and HClO, but not the concentration of F⁻. However, since HF and HClO react to form F⁻, the concentration of F⁻ is equal to the concentration of HF that has reacted. Let x be the concentration of F⁻ and let y be the concentration of ClO⁻. Then, we have:

[HClO] = 0.150 M - x

[F⁻] = x

[HF] = 0.300 M - x

[ClO-] = y

Substituting these concentrations into the equilibrium constant expression, we get:

K = (0.150 - x)(x)/(0.300 - x)(y)

At equilibrium, the reaction quotient Q is equal to the equilibrium constant K. Therefore, we can set Q = K and solve for y:

K = Q = (0.150 - x)(x)/(0.300 - x)(y)

y = (0.150 - x)(x)/(0.300 - x) / K

We are not given a value for K, so we need to calculate it. The value of K for this reaction can be found in a chemistry reference book or online. According to the CRC Handbook of Chemistry and Physics, the value of K for this reaction is 3.5 x 10⁻⁴ at 25°C.

Substituting this value for K and x = [F⁻] into the equation for y, we get:

y = (0.150 - x)(x)/(0.300 - x) / K

y = (0.150 - x)(x)/(0.300 - x) / 3.5 x 10⁻⁴

y = 0.041 x/(0.300 - x)

Substituting the initial concentration of HF into the expression for x, we get:

x = [F⁻] = [HF] reacted = 0.300 M - 2x

Substituting this expression for x into the expression for y, we get:

y = 0.041(0.300 - 2x)/(0.300 - x)

y = 0.041(0.300 - 2(0.300 - x))/(0.300 - (0.300 - x))

y = 0.041(2x - 0.150)/x

Simplifying this expression, we get:

y = 0.0828 - 0.274x

Substituting the value of x = 0.100 M (which is half of the initial concentration of HF that has reacted), we get:

y = 0.0552.

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Answer:

Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon, argon (Ar), and krypton . Oxygen, like all the other elements in group 16, has six valence electrons.

The pressure obtained when the temperature is raised to 50 degrees celsius is 135.5 KPa

From the question given above, the following data were obtained:

The final pressure can be obtained as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

Since the volume is constant, we have:

P₁ / T₁ = P₂ / T₂

125 / 298 = P₂ / 323

Cross multiply

298 × P₂ = 125 × 323

Divide both side by 298

P₂ = (125 × 323) / 298

P₂ = 135.5 KPa

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Operators analyze the ability of a treatment process to remove or an activate oocysts by coagulation and flocculation.

Coagulation and flocculation are methods that are used to separate the suspended solids portion from the water. Suspended particles may vary in source, charge, particle size, shape, and density. Correct application of coagulation and flocculation usually depends upon these factors.

Coagulation is also defined as the destabilization of colloidal particles brought about by the addition of a chemical reagent called as coagulant. Flocculation is defined as the agglomeration of destabilized particles into micro-floc and after into bulky floccules which can be settled called floc.

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10 moles of hydrogen gas are needed to produce 90 g of water in the presence of excess oxygen gas.

To determine the number of moles of hydrogen gas needed to produce 90 grams of water in the presence of excess oxygen gas, we need to follow a balanced chemical equation for the reaction between hydrogen and oxygen to form water.

The balanced equation for the reaction is:

2H₂(g) + O₂(g) → 2H₂O(g)

From the equation, we can see that 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water. This ratio is based on the stoichiometry of the reaction.

First, we need to calculate the molar mass of water (H₂O). The molar mass of hydrogen (H) is approximately 1 gram/mol, and the molar mass of oxygen (O) is approximately 16 grams/mol. Therefore, the molar mass of water (H₂O) is:

2(1 g/mol) + 16 g/mol = 18 g/mol

Now, we can use the molar mass of water to convert the given mass of water (90 grams) into moles. By dividing the mass of water by the molar mass of water, we get:

90 g / 18 g/mol = 5 mol

So, 5 moles of water are produced in the reaction.

Since the reaction is balanced at a 2:1 ratio of hydrogen to water, we need double the number of moles of hydrogen compared to water.

Therefore, we require:

5 mol * 2 = 10 moles of hydrogen gas

Hence, to produce 90 grams of water in the presence of excess oxygen gas, we would need approximately 10 moles of hydrogen gas.

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The probability of a hurricane forming in the northern hemisphere is about 36.4%.

To find the probability of a hurricane forming in the northern hemisphere, we need to use the formula for conditional probability. The formula is P(A|B) = P(A and B) / P(B), where A and B are two events.

In this case, the events are "hurricane forming" and "in the northern hemisphere". We can fill in the formula with the values from the two-way table:
P(hurricane | northern hemisphere) = P(hurricane and northern hemisphere) / P(northern hemisphere)

From the table, we see that there were 43 hurricanes that formed in the northern hemisphere. The total number of storms in the northern hemisphere is 75+43 = 118. Therefore:
P(hurricane | northern hemisphere) = 43/118

We can simplify this fraction by dividing the numerator and denominator by the greatest common factor of 43 and 118, which is 1. So:
P(hurricane | northern hemisphere) = 43/118 ≈ 0.3644

To express this as a percentage, we multiply by 100 and round to the nearest tenth:
P(hurricane | northern hemisphere) ≈ 36.4%

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Isotope -

What is the term for atoms that have the same number of neutrons and protons but a different energy configuration?

Atoms that have the same number of protons but different numbers of neutrons are known as isotopes. Isotopes have different atomic masses.

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Answer:

Compound.

Explanation:

Salt is an ionic compound. How do I know?

When dissolved in water (water is a covalent compound), then salt will allow electricity to move through it because it is a conductor.

Other reasons:

High melting point.

High boiling point.

Strong bond.

Transfers electrons.

Made of a metal or nonmetal.

Etc.

Answer:

Explanation:

assuming there is no friction

fnet=ma

2,000 kg*3m/s=6,000 N

The term that refers to the highest percentage of vo2max at which you can exercise for an extended time without accumulating significant amounts of lactic acid that force you to slow down or stop is called: lactate threshold

The lactate threshold is the point at which the body begins to produce lactic acid faster than it can be cleared from the muscles, resulting in an increased concentration of lactic acid in the blood. This point usually corresponds to about 60-85% of a person's maximum oxygen uptake (vo2max).

As a result, the lactate threshold can be used to measure aerobic fitness and endurance. In terms of exercise, when exercising at or below the lactate threshold, lactic acid will not accumulate significantly and you can exercise for an extended time.

However, if you exercise at a rate that is above your lactate threshold, lactic acid will begin to accumulate and force you to slow down or stop.

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Answer:

I think the answer is 800J

Explanation:

As the kinetic energy goes down, the potential energy goes up

Answer:

Both neutrons and protons

Explanation:

Both neutrons and protons are assigned as having masses of 1 amu each. In contrast, the electron has a negligible mass of . 0005 amu.

The relative atomic mass of hydrogen 1.00

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit

Here given data is

99.30% of H atoms

0.70% H atoms

So we have to calculate the relative atomic mass of hydrogen. = ?

So the relative atomic mass = (isotope abundance × isotope mass) + (isotope abundance × isotope mass)

Relative atomic mass = (99.30% × 1) + (0.70% × 1)

Relative atomic mass = 1.00

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To calculate the number of molecules present in a given number of moles of a substance, we can use Avogadro's constant, which states that there are 6.022 × 10^23 molecules in one mole of a substance.

Given that we have three moles of nitrogen, we can multiply this value by Avogadro's constant to find the number of molecules:

Number of molecules = 3 moles * (6.022 × 10^23 molecules/mole

Number of molecules = 1.8076 × 10^24 molecules

There are approximately 1.8076 × 10^24 molecules present in three moles of nitrogen.

The relationship between the quantity of substance in moles and the number of particles (atoms, molecules, ions, etc.) is established by Avogadro's constant, a fundamental constant. We can transform moles into molecules by multiplying the number of moles by Avogadro's constant. Three moles of nitrogen in this instance contain approximately   1.8076 × 10^24 molecules, as determined by multiplying three moles of nitrogen by Avogadro's constant.

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The produced at the anode in the electrolysis of molten CuF2 is A. F₂.

During electrolysis, CuF₂ will separate into Cu₂⁺ cations and F⁻anions. Cu₂⁺ will be reduced to copper metal, which will deposit on the cathode, whereas F⁻ anions will be oxidized to fluorine gas on the anode in the electrolysis of molten CuF₂. Hence, the answer is option A. Fluorine gas (F₂) is generated at the anode in the electrolysis of molten CuF₂.

Therefore, during the electrolysis of molten CuF₂, Cu₂⁺ is reduced to copper metal, which deposits on the cathode, and F⁻ anions are oxidized to fluorine gas on the anode, which is produced at the anode. The chemical reactions taking place during electrolysis of CuF₂ are given below: At the cathode, Cu₂⁺ cations get reduced to copper metal. Cu₂⁺ + 2e⁻ ⟶ Cu. At the anode, F⁻ anions get oxidized to fluorine gas. 2F⁻ ⟶ F₂ + 2e⁻. Therefore, option A is correct.

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Answer:

Explanation:  encourage your legislators to support land acquisition programs such as Florida Forever and the Rural and Family Lands Protection Program.