Which is amphoteric but not amphiprotic?Al2O3HCO3 -H2OHS-

Answer:

The answer is Rubidium

Explanation:

The number of protons is unique for each element. It is also identified as an element’s atomic number. Look for an element with the number of protons as the atomic number to find the unidentified element.

Answer:

Hello again, I think the option will be the third one Rubidium im highly sure because the periodic table goes by the number of protons which in your question is 37. So yeah it will be rubidium.

Explanation:

Look for 37 protons in the periodic table.

explanation for qn:

when converting units, u can show your working in the form

37.5 × 1g/1ml, then convert the g and ml into 1/1000 kg and L, and calculate from there. In the end, u find out its actually a trick qn and 1g/ml = 1 kg/L

Answer:

9.55 mol of Al

Explanation:

To obtain the number of moles of a certain element given the number of atoms only, you have to divide it with Avogadro's number,

6.02 x 10^23 mol−1.

mol Al = (( 5.75 x 10^24 Al) atoms) ⋅ ((1 mol / 6.02 x 10^23 Al ) atoms)  

mol Al= 9.55 mol

Hope this helped you out!

Answer:

F = 130 N

Explanation:

We use the formula F = ma  

∴ F is force, m is mass and a is acceleration

F = ?

m = 65 kg

a = 2 m/\(s^{2}\)

Substituting the values in the equation:

F = 65 x 2

F = 130 N

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{12}{6} \\ \)

We have the final answer as

Hope this helps you

In the experiment in which a scientist is testing if caffeine helps mice run games faster;

An experiment is a scientific test or study which is performed in order to prove or disprove a hypothesis.

Experiments can also be undertaken in order to further establish or improve upon already established.

Variables are those factors that are studied in an experiment.

In a scientific experiment, the following variables are present:

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The pair of electrons involved in a covalent bond is called a bonding pair, whereas the electrons not involved in bonding are called non-bonding pair or lone pair.

In a covalent bond, two atoms share a pair of electrons, which helps to hold the atoms together. These shared electrons are known as the bonding pair because they contribute to the formation of the chemical bond between the atoms.

On the other hand, in some molecules, there may be electrons that are not involved in bonding and are not shared between atoms. These electrons are often found on a single atom and are referred to as non-bonding or lone pairs. Lone pairs are usually depicted as pairs of dots around the atom in Lewis dot structures.

Both the bonding pair and the lone pairs of electrons play important roles in determining the shape, polarity, and reactivity of molecules in covalent compounds.

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Answer:

−0.60205999

Explanation:

The mass percent of KBr in the solution is 35.6%, the mole fraction is 0.077, and the molality is 0.083 mol/kg.

To calculate the mass percent of KBr in the solution, first, find the total mass of the solution by adding the masses of KBr and H₂O: 3.44 g + 6.22 g = 9.66 g. Then, divide the mass of KBr by the total mass of the solution and multiply by 100: (3.44 g / 9.66 g) × 100 = 35.6%.

For the mole fraction, divide the moles of KBr by the total moles in the solution: 0.0289 moles / (0.0289 moles + 0.346 moles) = 0.077.

Finally, to find the molality, divide the moles of KBr by the mass of H₂O in kilograms: 0.0289 moles / (6.22 g × 1 kg/1000 g) = 0.083 mol/kg.

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Answer:

Sodium has 11 electrons and Chlorine has 17 electrons

Explanation:

You can find the number of electrons by looking at the atomic number

The atomic number is the number above the elements on the periodic table

The atomic number is also the number of protons there are too

hope this helps

Answer:

6g/cm³

Explanation:

Density of a substance can be calculated as follows:

Density = mass (g)/volume (cm³)

According to this question, a sample of silver has a volume of 6 cm³ and a mass of of 36g. The density will be

Density = 36/6

Density = 6g/cm³​

Answer:A

Explanation:

Answer:

A working model used to test a design is called a

stop

When an oceanic plate is subducted beneath another plate during a convergent boundary, the rock that can likely result is metamorphic rock.

Explanation:

This occurs because as the oceanic plate is subducted, it is forced deep into the Earth's mantle where it is subject to extreme heat and pressure. This heat and pressure cause the minerals and rocks in the oceanic plate to recrystallize, creating metamorphic rocks.

Examples of metamorphic rocks that can be formed from subducted oceanic plates include blueschist, eclogite, and amphibolite. These rocks can then be brought to the surface through a process called uplift and can be studied to understand the geological history of the area.

~ Zeph

Answer:

Option 4

Explanation:

The half life of cobalt -60 is 5.3 years. And if a half is 5.3 yrs long, then a period of 10.6 years have passed.

The activity of a radioactive sample is defined as the rate at which radioactive particles are emitted.

After one life, 1/2 the mass of the original isotope remains. After another half life, 1/4 the mass of the original isotope remains

And if a half is 5.3 yrs long, then a period of 10.6 years have passed.

The half life equation is

A(t)  = A0 (1/2) ^ t/t1/2

t1/2 = half life = 5.3 yes

A0 = intial quantity

A(t) = amount left after t years = 1/4 A0

t = time undergone =?

Substitute

1/4 A0 = A0 (1/2) ^ t/5.3

= 1/4 = (1/2) ^ t/5.3

Take the log of

log (1/4) = log { (1/2)^t/5.3}

= log)(1/4) = t/5.3 log (1/2)

Dividend both sides by log (1/2)

log (1/4) / log (1/2) = t/5.3 log(1/2) /log(1/4)

2 = t/5.3

t= 2.53 = 10.6 yrs

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Entropy is a measure of the degree of randomness or disorder in a system. It is represented by the symbol S and is a thermodynamic property that is often used to describe the behavior of gases.

When it comes to comparing the entropy of helium gas and oxygen gas, it is important to consider the physical properties of each gas. Helium gas is a noble gas that has a relatively low atomic mass and a very low boiling point. It is a monoatomic gas, meaning that each helium atom exists as a single atom rather than a molecule. Because helium has a low atomic mass and is monoatomic, it has a very low entropy.

Oxygen gas, on the other hand, is a diatomic gas, meaning that each molecule of oxygen consists of two oxygen atoms. Oxygen gas has a higher atomic mass than helium, and it also has a higher boiling point. Due to these properties, oxygen gas has a higher entropy than helium gas.

In conclusion, oxygen gas has a greater entropy than helium gas due to its higher atomic mass, its diatomic nature, and its higher boiling point. These factors contribute to a greater degree of randomness and disorder in oxygen gas compared to helium gas, making oxygen gas more likely to behave in unpredictable ways.

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Answer:

radiation i think

Explanation:

thts why the solar panels can maķe electricity

All toxic substances are hazardous, but not all hazardous substances are toxic because, unlike toxic substances, hazardous materials can pose risks due to their flammability, reactivity, or corrosivity, rather than their potential to cause harm through poisoning or toxicity.

Hazardous materials are not necessarily toxic because they may pose a danger to health and the environment for reasons other than their toxicity. Hazardous materials may have physical or chemical properties that make them flammable, explosive, corrosive, reactive, or pose a risk of radiation exposure. These properties can create hazards such as fire, explosion, chemical burns, or environmental contamination that may cause harm to human health or the environment, even if the substance itself is not toxic. In summary, while all toxic substances are hazardous, not all hazardous substances are toxic.

This is because, unlike toxic substances, hazardous materials may pose a risk due to their physical or chemical properties, such as flammability, reactivity, or corrosiveness, without necessarily being toxic to humans or the environment. For example, gasoline is a hazardous substance due to its flammability, but it may not be toxic unless ingested or inhaled in large quantities.

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A 30-day supply of Levoxyl at a dosage of one 13 μg tablet per day contains 0.39 mg of Levoxyl.

For a patient taking one 13 μg tablet of Levoxyl per day, the total amount of levothyroxine they are receiving is 13 micrograms. To calculate the total amount in a 30-day supply, we simply multiply this amount by 30.

13 μg/tablet x 1 tablet/day x 30 days = 390 μg

Note that the microgram (μg) is a unit of mass equal to one millionth of a gram, while the milligram (mg) is a unit of mass equal to one thousandth of a gram. To convert μg to mg, we divide by 1000:

390 μg / 1000 = 0.39 mg

Levoxyl is a medication used to treat hypothyroidism, a condition where the thyroid gland doesn't produce enough hormones to regulate the body's metabolism. The active ingredient in Levoxyl is levothyroxine sodium, which is a synthetic form of the hormone thyroxine (T4).

Levoxyl tablets are available in several strengths, ranging from 25 mcg to 300 mcg. The recommended dosage depends on the patient's age, weight, and the severity of their hypothyroidism. In general, adults with normal thyroid function usually require about 1.6 mcg of levothyroxine per kilogram of body weight per day.

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a. The balanced equation for the synthesis of ammonia gas is: N\(_{2}\) + 3H\(_{2}\) → 2NH\(_{3}\).

b. The volume of ammonia gas produced is approximately 1934.74 liters.

To determine the volume of ammonia gas produced, we need to use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Given:

Mass of nitrogen = 10 kg

Temperature = 550°C = 823 K

Pressure = 250 atm

First, we need to calculate the number of moles of nitrogen. The molar mass of nitrogen (N\(_{2}\)) is approximately 28 g/mol. Using the given mass of nitrogen (10 kg), we can convert it to grams (10,000 g) and then divide by the molar mass to get the number of moles (357.14 mol).

From the balanced equation for the synthesis of ammonia (N\(_{2}\) + 3H\(_{2}\) → 2NH\(_{3}\)), we know that 1 mole of nitrogen reacts to produce 2 moles of ammonia.

Therefore, the number of moles of ammonia produced is twice the number of moles of nitrogen, which is 2 * 357.14 = 714.29 mol.

Now, we can use the ideal gas law to calculate the volume of ammonia gas. Rearranging the equation, V = (nRT) / P, we can plug in the values:

V = (714.29 mol * 0.0821 L·atm/(mol·K) * 823 K) / 250 atm = 1934.74 L.

So, the volume of ammonia gas produced is approximately 1934.74 liters.

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Answer:

Nitrogen

Explanation:

The release of additional flammable materials can be caused by a variety of factors, including sparks or flames from the initial fire, mechanical or electrical malfunctions, or other sources of ignition.

The release of additional flammable materials can be caused by a number of factors, including:

It is important to be aware of the potential sources of additional flammable materials in order to prevent secondary fires from occurring.

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The periods of warming and cooling that the Earth has been through in the past are known as climate cycles or glacial-interglacial cycles.

During a warming event, we would expect the climate on Earth to be generally warmer, with a higher concentration of greenhouse gases in the atmosphere and higher sea levels due to melting ice caps. This could lead to more extreme weather patterns, including more frequent and intense heatwaves, droughts, and hurricanes.

During a cooling event, we would expect the climate on Earth to be generally colder, with lower concentrations of greenhouse gases in the atmosphere and lower sea levels due to expanding ice caps. This could lead to periods of widespread glaciation and colder temperatures, which could have significant impacts on ecosystems and human populations.

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The difference in pressure between methane and an ideal gas under the given conditions is approximately 5.93 atm.

The difference in pressure between methane (using the van der Waals equation) and an ideal gas can be calculated using the formula:

ΔP = [(an²/V²) - (2bn/V)] * (RT/V)

where:

ΔP is the difference in pressure,

a and b are the van der Waals constants for methane (a = 2.300 L^2·atm/mol^2, b = 0.0430 L/mol),

V is the volume of the gas (8.00 L),

R is the ideal gas constant (0.0821 L·atm/(mol·K)),

T is the temperature in Kelvin (23.8 °C + 273.15 = 296.95 K).

Substituting the given values into the formula:

ΔP = [(2.300 L^2·atm/mol^2 * (15.0 mol)^2) / (8.00 L)^2 - (2 * 0.0430 L/mol * 15.0 mol) / 8.00 L] * (0.0821 L·atm/(mol·K) * 296.95 K)

Simplifying the expression gives:

ΔP = [(2.300 * 15.0^2) / 8.00^2 - (2 * 0.0430 * 15.0) / 8.00] * (0.0821 * 296.95)

Calculating this expression will give the difference in pressure between methane and an ideal gas under the given conditions.

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Students can address water and air pollution by organizing seminars to raise awareness and educate others about the issues,

A. Organize seminars

B. recycling and waste disposal

Water pollution and air pollution are significant environmental hazards that require collective efforts to address. Students can play a crucial role in raising awareness and taking action to mitigate these issues. Here are the appropriate answers from the given options:

What can students do to address these environmental hazards?

A. Organize seminars

B. recycling and waste disposal

A. Organize seminars: Students can organize seminars or workshops to educate other students and the community about the deteriorating environmental conditions and the steps needed to improve the area. By sharing knowledge and information, students can raise awareness about the causes and impacts of water and air pollution, as well as the potential solutions to mitigate them. Seminars can provide a platform for experts, scientists, and environmentalists to share their expertise and inspire action.

B. Recycling and waste disposal: Encouraging other students to volunteer for workshops about recycling and waste disposal is an effective step toward addressing environmental hazards. By promoting proper waste management practices, such as recycling, composting, and reducing single-use plastics, students can contribute to minimizing pollution and conserving resources. These workshops can educate students on the importance of responsible waste disposal and provide practical tips and techniques to implement in their daily lives.

In summary, students can address water and air pollution by organizing seminars to raise awareness and educate others about the issues, as well as by promoting recycling and proper waste disposal practices. Through these actions, students can foster a culture of environmental stewardship and inspire positive change in their communities.

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The first step we have to follow is to find the molar mass of FeCl2 using the atomic masses of each element:

It means that each mole of FeCl2 has a mass of 126.745g/mol.

Use the molar mass to find the mass of the given amount of moles:

It means that there are 110,141.405 grams of FeCl2.

In scientific notation it would be 1.10x10^5g.

there are 110,141.405 grams of FeCl2

The incorrect statement for red blood cells is A. They prefer CO2 at pH 7.35. Red blood cells have a higher affinity for CO2 compared to O2. Hence, they bind CO2 at the tissues where the partial pressure of CO2 is higher due to metabolic activity.

Similarly, they bind O2 at the lungs where the partial pressure of O2 is higher due to respiration. Therefore, options D and E are correct.

Moreover, the oxygen dissociation curve of hemoglobin is shifted to the right at lower pH, which means that at pH 7.35, the affinity of hemoglobin for oxygen is decreased, and it is more likely to release oxygen to the tissues. On the other hand, at pH 7.45, the affinity of hemoglobin for oxygen is increased, and it is more likely to bind oxygen in the lungs. Therefore, option C is also correct.

However, option A is incorrect because red blood cells actually prefer CO2 at lower pH (i.e., acidic conditions), not at pH 7.35, which is closer to neutral pH. At lower pH, the affinity of hemoglobin for CO2 is increased, which helps in the transport of CO2 from the tissues to the lungs for elimination.

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