Iron is not buoyant in water because it has a greater density than water true or false?

Answer:

the answer is calcium

Explanation:

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option E is correct option.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet. Out of given options, calcium element could be used in industry to control electron flow. Calcium belongs to alkaline earth metals that is group 2 of periodic table.

Therefore, the correct option is option E.

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The amount of heat required to raise the temperature of the 34.2 g sample of aluminum by 34 oC is 1043.52 J.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance. It is a physical property that determines the direction of heat flow between two objects or systems in contact with each other. Temperature is measured in degrees Celsius (°C) or Fahrenheit (°F), or in kelvin (K) in the International System of Units (SI).

The amount of heat (q) required to raise the temperature of a substance can be calculated using the formula:

q = m x c x ΔT

Where:

m = mass of the substance (in grams)

c = specific heat of the substance (in J/g oC)

ΔT = change in temperature (in oC)

Plugging in the values given:

m = 34.2 g

c = 0.9 J/g oC

ΔT = 34 oC

q = (34.2 g) x (0.9 J/g oC) x (34 oC)

q = 1043.52 J

Therefore, the amount of heat required to raise the temperature of the 34.2 g sample of aluminum by 34 oC is 1043.52 J.

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Answer:

210.15 g

Explanation:

The molar mass of nitrogen is approximately 14.01 g/mol.

14.01*15=210.15

19.42g of fluorine is produced upon decomposition of sodium fluoride.

The mass of a given substance is converted to moles using the molar mass of this substance in the periodic table. Moles of a given substance are then converted to moles of an unknown substance using the molar ratios from the balanced chemical formulas.

Mass ratio is defined as the percentage composition of the masses of elements in a molecule or compound. A compound always has a defined mass fraction of the corresponding element.

Mass ratio of sodium to fluorine = 1.21:1

If the mass of sodium fluoride produced is 23.5 g

Using dimensional Analysis,

(23.5g of sodium/sodium fluoride)×(1 g of Fluorine/1.21 g of sodium)

= 19.42g(g of fluorine/g of sodium fluoride)

Mass of fluorine produced = 19.42g

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Answer:

To find the percentage by weight of oxygen in the gaseous compound, we need to first find the weight of the compound that is not oxygen. We can do this by subtracting the weight of the oxygen from the total weight of the compound: 50.0 grams - 30.0 grams = 20.0 grams.

Next, we need to divide the weight of the oxygen by the total weight of the compound and multiply the result by 100% to express the answer as a percentage: 30.0 grams / 50.0 grams * 100% = 60.0%.

Therefore, the percentage by weight of oxygen in the gaseous compound is 60.0%.

Explanation:

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

something that can be maintained over a period of time

Answer:

a balance between meeting today's needs.......

Explanation:

Answer:

283.211

Explanation:

Answer:

Methane and chlorine

If a mixture of methane and chlorine is exposed to a flame, it explodes - producing carbon and hydrogen chloride. This is not a very useful reaction! The reaction we are going to explore is a more gentle one between methane and chlorine in the presence of ultraviolet light - typically sunlight. This is a good example of a photochemical reaction - a reaction brought about by light.

CH4+Cl2+energy→CH3Cl+HCl(3.4.2)

The organic product is chloromethane. One of the hydrogen atoms in the methane has been replaced by a chlorine atom, so this is a substitution reaction. However, the reaction doesn't stop there, and all the hydrogens in the methane can in turn be replaced by chlorine atoms.

Substitution reactions happen in which hydrogen atoms in the methane are replaced one at a time by chlorine atoms. You end up with a mixture of chloromethane, dichloromethane, trichloromethane and tetrachloromethane.

I hope this help you!:)

Explanation:

Answer:

The traditional vision of the role science should play in policy making is of a two stage process of scientists first finding out the facts, and then policy makers making a decision about what to do about them.

Explanation:

Answer:

p4 is the correct answer

Answer:

It produces magnesium oxide and hydrogen gas.

Explanation:

When magnesium burns with steam it produces magnesium oxide which is white in color and hydrogen gas. When magnesium burns, it mixes with the oxygen present in the air produces magnesium oxide in powder form. Magnesium react with oxygen by giving two electrons present in its valance shells while the oxygen needs two electron for completing their valance shell and becomes stable.

Answer:

yes I think that they are correct

Answer:

Neutrons

Explanation:

An isotope has more or less number of neutrons in the nucleus.

The nucleus of an atom is made up of two fundamental particles, the protons and the neutrons. Protons are positively charged particles in an atom. Neutrons do not carry any charges whatsoever.

Answer:

1.875 gallons

Explanation:

Answer:

The answer is 3

C2H5OH + O2 CO2 +H2O (unbalanced)

C2H5OH +3O2(g). 2CO2(g)+3H2O(balanced)

According to the balanced chemical equation, C₂H₅OH + 3 O₂\(\rightarrow\) 2 CO₂ + 3 H₂O the coefficient of oxygen is three.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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answer and explanation

to determine the the solution of this problem we need to used the combined gas law which states :

P1V1/T1 = P2V2/T2

we can rearrange this and make T2 the subject of the formula like so:

T2 = (P2V2)T1/ P1V1

= (1atm x 1000ml)x 75/ 750 ml x 0.750 atm

= 133 degrees celcius

The internal energy △E of the gas increased by 7,012.5 J.

The internal energy change of a system is given by the equation: ΔE = q + w where ΔE is the change in internal energy, q is the heat added to the system, and w is the work done by the system.

Since the volume remains constant, no work is done, so w = 0. Therefore, ΔE = q.

The heat added to the system is given by the equation:

q = nC(v)ΔT

where n is the number of moles of gas, C(v) is the molar specific heat capacity at constant volume, and ΔT is the change in temperature.

Substituting the given values, we get:

q = (1.00 mol) x (25.00 J/mol.K) x (280.5 K - 140.0 K)

q = 7,012.5 J

Therefore, the internal energy change for this process is:

ΔE = q = 7,012.5 J

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Following are the effects of acid rain.

What is Acid Rain?

Acid rain is caused by the accumulation of nitric and sulfuric acids in the atmosphere. These compounds are strong acids and are very soluble in water, dissolving in droplets in clouds.

Limestone effect:

Calcium carbonate, [Ca][CO3], is a very common mineral. A limestone is a well-known form of calcium carbonate. The acid contained in acid rain reacts with carbonate ions and promotes the dissolution of calcium carbonate.

This will create a bicarbonate solution. The presence of limestone and other calcium carbonates in lakes and streams helps maintain a constant pH as the mineral reacts with excess acidity. However, acid rain can eventually exceed the buffering capacity of surface waters.

How does acid rain affect buildings made of marble and limestone?

It is mainly affected in 2 ways: dissolution and alteration. Calcite dissolves when sulfuric, sulfuric and nitric acids in polluted air react with calcite in marble and limestone. Exposed areas of buildings and statues show rough surfaces, worn materials, and loss of sculptural detail. Stoneface material can be lost anywhere or only in more reactive areas.

Hence, this is how acid rain affects.

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The Method of Mixtures Electrical Method is a method used to determine the electrical conductivity of a material.

The Electrical Method is a geophysical prospecting technique that uses electrical resistivity to map subsurface features, such as geological structures, fractures, and mineral deposits.

It involves measuring the amount of current that passes through a mixture of two materials under the application of a known voltage. The electrical conductivity of each material can then be determined by calculating the ratio of the current to the applied voltage. The electrical conductivity obtained from the Method of Mixtures Electrical Method can be used to characterize materials such as semiconductors and insulators.

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Answer:i try and try but nobody likes me

Explanation: that's the story of the day lucky person brainiest pls

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Answer:

i think it table broke in half

Explanation:

Answer: it would be change in water temperature

Explanation: because the change in the water is the temperature and its is

evaporation

Molarity as Stoikiometri

Equatuions od Molarity :

M = m/Mr × 1000/V

Mr Lithium Dichromate (Li2CrO4)

= Ar Li (2) + Ar Cr + Ar O (4)

= 7 (2) + 52 + 16 (4)

= 14 + 52 + 64

= 130 g/mol

Molarity

= m/Mr × 1000/V

= 19.5 g/130 g/mol × 1000/95 mL

= 0.15 mol × 10.53 /L

= 1.5795 mol/L

So, the molarity of the solution is 1.5795 mol/L

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Answer:

Sonar Pulse

Explanation:

A seismometer is a device that captures the surface trembling of the Earth brought on by seismic waves. Sonar Pulse is not part of a seismograph.

A seismometer is a device that detects vibrations in the ground brought on by explosions, volcanic eruptions, and earthquakes. A seismograph is typically made up of these together with a timing device and a recording device.

A seismometer is a device that captures the surface trembling of the Earth brought on by seismic waves. The combined seismometer and recording equipment is referred to as a seismograph in most cases.

Geologists utilize a seismometer, sometimes known as a seismograph, to measure and capture seismic waves. Scientists can map the interior of the planet by looking at these records, and they can also quantify or pinpoint earthquakes and other ground tremors.

Thus, option B is correct.

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The heat energy required to boil 75.25 g of ethanol is 62.1775 kJ.

To calculate the heat energy required to boil 75.25 g of ethanol, we need to use the formula:
Q = m × ΔHvap

Where Q is the heat energy required, m is the mass of ethanol, and ΔHvap is the heat of vaporization for ethanol.
Substituting the given values into the formula, we get:
Q = 75.25 g × 0.826 kJ/g
Q = 62.1775 kJ

This means that we need to supply 62.1775 kJ of heat energy to the ethanol to convert it from a liquid to a gas. The heat of vaporization is a measure of how much heat energy is required to break the intermolecular forces between the molecules of a liquid and convert it to a gas at a constant temperature. In the case of ethanol, it takes 0.826 kJ of heat energy to vaporize one gram of the liquid.

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Answer:

If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?