PLEASEEEE HELPPPP I BEGG FOR HELPPP PLEASE
________________ are powered by redox reaction.
A) diesel engines B) steam engines C) rocket engines D) gasoline engines

Explanation:

This calculator will find the missing variable in the physics equation for force (F = M * a), when two of the variables are known.

Force is measured in newtons (N)

Force = mass × acceleration

Mass is in kilograms (kg) and acceleration in meters per second squared (m/s2).

a, proton following identifies an element

The number of protons identifies an element. Therefore, option A is correct.

The atomic number is used to identify an element, and it is the number of protons in an element's nuclei. Every element has a distinct number of protons, and thus an atomic number.

Electron configuration, atomic size, ionization energy, electron affinity, and electronegativity are atomic properties that are critical to element behavior.

The atomic number is the number of protons in the nucleus of an atom. The number of protons defines the identity of an element.

The number of protons in an element is the only way to identify it; the number of neutrons and electrons can vary without changing the element's identity.

Thus, The number of protons identifies an element, option A is correct.

To learn more about an element, follow the link;

https://brainly.com/question/13025901

#SPJ6

Answer:380.580722 g/mol

Explanation:

380.580722 g/molCopper(II) phosphateNamesChemical formulaCu3(PO4)2Molar mass380.580722 g/mol (anhydrous) 434.63 g/mol (trihydrate)Appearancelight bluish-green powder (anhydrous) blue or olive crystals (trihydrate)Solubility in waterslightly soluble

The molar mass of Cu₃(PO₄)₂ is calculated by summing the contributions of copper, phosphorus, and oxygen, resulting in a total of 380.59 g/mole.

To calculate the molar mass of Cu₃(PO₄)₂, follow these steps:

Identify the atomic masses for each element:

Cu = 63.55 g/mole,

P = 30.97 g/mole,

O = 16.00 g/mole.

Calculate the contribution of each element in the compound:

Add the contributions to find the total molar mass:

Molar mass of Cu₃(PO₄)₂ = 190.65 g/mole + 61.94 g/mole + 128.00 g/mole

= 380.59 g/mole.

Therefore, the molar mass of Cu₃(PO₄)₂ is 380.59 g/mole.

Ok so First of all we start with the fire. The fire gives off radiation because you can feel the heat through space. The fire also gives of conduction because you put the hotdog on the fire to cook it, and the hotdog will give off steam when it is hot causing it to give of Convection.

There is how cooking a hotdog over a fire uses all three heat transfer

Roasting a hot dog over a fire involves all three types of heat transfer: conduction, convection, and radiation. Conduction transfers heat through the stick to the hot dog, convection happens when heat is carried to the hot dog by hot gases rising from the fire, and radiation is heat traveling through the air from the fire to the hot dog.

When you are roasting a hot dog over a fire, all three types of heat transfer - conduction, convection, and radiation - are involved.

Conduction is when heat energy is directly transferred through a substance, in this case from the hot dog stick to the hot dog itself. Heat from the fire causes the molecules in the stick to vibrate more, which in turn cause the molecules at the lower end of the stick where the hot dog is placed to vibrate, and this transfers heat to the hot dog.

Convection occurs when heat is transferred through a fluid (which could be gases or liquids). Here, the hot gases rising from the fire reach the hot dog, heating it.

Lastly, radiation is heat transfer that doesn't require a medium to move through. Essentially, it's heat transfer simply through the air. In the hot dog scenario, it's the heat from the fire radiating outwards in all directions, some of it reaching the hot dog and cooking it.

So, in essence, roasting a hot dog over a fire is a great way to understand heat transfer!

https://brainly.com/question/13433948

#SPJ2

Answer:

color

Explanation:

Scientists can use the color of minerals to tell them apart.

Answer:

ΔH₁₂ = -867.2 Kj

Explanation:

Find enthalpy for 3H₂ + O₃ => 3H₂O given ...

2H₂ + O₂ => 2H₂O      ΔH₁ = -483.6 Kj

        3O₂ => 2O₃        ΔH₂ = + 284.6 Kj

_____________________________

3(2H₂ + O₂ => 2H₂O) => 6H₂ + 3O₂ => 6H₂O       (multiply by 3 to cancel O₂)

6H₂ + 3O₂ => 6H₂O        ΔH₁ = 3(-483.6 Kj) = -1450.6Kj

          2O₃ => 3O₂           ΔH₂ = -284.6Kj              (reverse rxn to cancel O₂)

_______________________________

6H₂ + 2O₃ => 6H₂O         ΔH₁₂ = -1735.2 Kj       (Net Reaction - not reduced)

________________________________

divide by 2 => target equation (Net Reaction - reduced)

3H₂ + O₃ => 3H₂O            ΔH₁₂ = (-1735.2/2) Kj = -867.2 Kj    

Answer:

-1300

Explanation:

Answer:

1. Option(1) 3

2. Option (2) 1/2

Explanation:

1. We'll begin by obtaining the molar mass of H3PO4. This is illustrated below:

Molar Mass of H3PO4 = (3x1) + 31 + (16x4) = 3 + 31 + 64 = 98g/mol

Mass of H in H3PO4 = 3x1 = 3g

The percentage by mass of H in H3PO4 given by:

Mass of H in H3PO4/Molar Mass of H3PO4 x 100

=> 3/98 x 100

=> 3

2. Atoms present in H3PO4 are given below:

H = 3 atoms

P = 1 atom

O = 4 atoms

Total = 8 atoms

The fraction of oxygen atom in H3PO4 is given by:

=> Atom of O/total atoms

=> 4/8

=> 1/2

Answer:

CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4

Explanation:

The reaction between CuSO4 and NaOH leads to the formation of Cu(OH)2 as the insoluble precipitate and Na2SO4 in solution.

The reaction between CuSO4 and NaOH in an aqueous solution leads to the formation of copper (II) hydroxide, Cu(OH)2, and sodium sulfate, Na2SO4. However, the student's example and information provided seem to have mixed details regarding a different reaction involving carbonates. When CuSO4 reacts with NaOH, the insoluble precipitate formed is Cu(OH)2, a blue substance. This can be balanced and represented as CuSO4(aq) + 2NaOH(aq) → Cu(OH)2(s) + Na2SO4(aq). Here, sodium sulfate remains dissolved in the aqueous solution, functioning as spectator ions, and does not participate actively in the formation of the precipitate.

The precipitate for CuSO4 + NaOH reaction is Cu(OH)2. When copper sulfate reacts with sodium hydroxide, a double displacement reaction occurs where the insoluble copper hydroxide precipitates out. The balanced chemical equation would be: CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4

Answer:

its manganese

Explanation:

Manganese is in the middle of the period has the highest number of oxidation states because all other elements have at least two different oxidation states

Answer: hey its me btw the answer is The number of electrons the element needs to lose or gain to have a full valence shell

Explanation:

Final answer:

In Chemistry, significant figures represent precision in measurements. The number of significant figures varies for each measurement based on the rules of counting significant figures, considering zeros as either placekeepers or significant values.

Explanation:

The subject of this question is Chemistry, particularly focusing on significant figures which are crucial for representing precision in measurements. Let's determine the number of significant figures in each given measurement using the rules for counting significant figures:

0.0908 has three significant figures (leading zeros are not significant).

340.02 has five significant figures (zeros between non-zero digits are significant).

5420 has three significant figures, assuming the last zero is not significant unless otherwise stated (if in scientific notation, it would clarify).

12.90 has four significant figures (trailing zeros in a decimal are significant).

3.09 x 10^8 has three significant figures (all digits in the coefficient are significant).

0.79 has two significant figures (leading zeros are not significant).

0.02050 has four significant figures (trailing zeros in a decimal number are significant).

0.009 has one significant figure (leading zeros are not significant).

4709 has four significant figures (all non-zero digits are significant).

Answer:

Endergonic reactions

Explanation:

The terms endergonic and exergonic describe reactions in terms of the energy transfer. Because ender = in, exo = out, we can tell that endergonic reactions need energy put in, and exergonic don't need energy put in, they release energy!

The mass of carbon dioxide gas occupying a volume of 81.3 L at 204 kPa and 95 °C is calculated using the ideal gas law and converting the pressure and temperature to compatible units, followed by converting moles to mass using the molar mass of CO2.

To determine the mass of carbon dioxide gas that occupies a given volume under specific conditions of pressure and temperature, we can use the ideal gas law. The ideal gas law is represented by the 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 in Kelvin.

Firstly, we need to convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature:
T(K) = 95 °C + 273.15 = 368.15 K

The pressure needs to be converted from kPa to atm because the standard value for the gas constant R is usually given in units of L atm/mol K. The conversion factor is 1 atm = 101.325 kPa, so:
P(atm) = 204 kPa / 101.325 kPa/atm = 2.012 atm

Using the ideal gas law, we can solve for the number of moles:
n = PV / RT = (2.012 atm)(81.3 L) / (0.082057 L atm/mol K)(368.15 K)

After calculating n, we then convert moles to mass using the molar mass of CO2, which is 44.01 g/mol. The final mass, in grams, will be the product of the number of moles and the molar mass.

Answer:

The answer is 3rd option.

Explanation:

Lipid is a liquid form of fat

Protein is not a sugar or starch solution.

Carbohydates is a large and complex molecules in a form of sugar.

The statement of kb is "[C5H5NH+][OH-]/[C5H5N]"

The base dissociation constant is defined as Kb. In water, the base dissociation constant is a measurement of how efficiently a base dissociates into its component ions.

The hydroxide ion is formed when weak bases react with water, as stated in the general equation below, where B is the parent base and BH+ is its conjugate acid:

B(aq) + H2O(l) ⇌ BH+ (aq) + OH−(aq)

The base dissociation constant (Kb), also known as the base ionisation constant, is the equilibrium constant for this reaction:

Kb = [BH+][OH−]/[B]

From the given equation, base dissociation constant comes out to be,

Kb = [C5H5NH+][OH-]/[C5H5N]

Hence the correct answer is Kb = [C5H5NH+][OH-]/[C5H5N]

Learn more about base dissociation constant here

https://brainly.com/question/9933883

#SPJ2

Answer:

P = 24.34 atm

Explanation:

V = 5.0L

P = ?

n = 4.75 moles

T = 39.3°C = (39.3 + 273.15)K = 312.45K

From ideal gas equation,

PV = nRT

P = pressure of the gas

V = volume of the gas

n = no. Of moles present

R = ideal gas constant = 0.082atm.L / mol.K

PV = nRT

P = nRT / V

P = (4.75 * 0.082 * 312.45) / 5

P = 121.699 / 5

P = 24.339 atm

P = 24.34 atm

The pressure of the gas is 24.34 atm

Final answer:

The pressure in a 5.00 L tank with 4.75 moles of oxygen at 39.3 °C is calculated using the ideal gas law, resulting in approximately 24.65 atm.

Explanation:

To calculate the pressure of a gas in a tank, we can use the ideal gas law which is 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 in Kelvin.

First, convert the temperature from degrees Celsius to Kelvin by adding 273.15 to the Celsius temperature:

T = 39.3 °C + 273.15 = 312.45 K

Next, use the ideal gas law to calculate the pressure:

P =[tex]\frac{nRT}{V}[/tex]

Given n = 4.75 moles, T = 312.45 K, V = 5.00 L, and R = 0.0821 atm·L/mol·K (value of the ideal gas constant when pressure is measured in atmospheres), we can calculate the pressure:

P = [tex]\frac{(4.75 moles)(0.0821 atm·L/mol·K)(312.45 K)}{5.00 L}[/tex]

Doing the calculation:

P =[tex]\frac{(4.75)(0.0821)(312.45)}{5.00}[/tex] = 24.65 atm

This means the pressure inside the 5.00 L tank containing 4.75 moles of oxygen at 39.3 °C is approximately 24.65 atmospheres.

Answer:

Prokaryotic are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleotide.

Explanation:

Answer:

cotyledons

Explanation:

A vascular plant that produces flowers, reproduces with seeds, and has two cotyledons is known as a Eudicot. Examples include dandelions and violets. They make up two-thirds of all flowering plants.

A plant that is vascular, produces flowers, reproduces with seeds, and has two cotyledons belongs to the Eudicots, also known as true dicots. Examples of these plants include dandelions or violets. They possess vascular tissue that forms a ring in the stem and their flower parts come in four, five, or many whorls. Seed plants, like eudicots, are further divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers.

Additionally, eudicot plants have two cotyledons, and the veins form a network in their leaves. Their root system is generally characterized by one main root that develops from the embryonic radicle. Eudicots constitute about two-thirds of all flowering plants which also makes them a significant part of the angiosperms - a division of plants that emerged about 160 million years ago.

https://brainly.com/question/39283679

#SPJ12

Answer:

1. False 2. True

Explanation:

1. Nitrogen forms the rungs

Answer:

2000

Explanation:

it is verified by scientists

3440 kJ is the energy that is required to vaporize 2 kg of aluminum. The elemental source of energy upon earth is said to be the sun.

On earth, energy comes in a variety of ways. The elemental source of energy upon earth is said to be the sun. Energy is seen as a quantifiable property in physics that may be transferred form an item to carry out work. Thus, we might characterise energy as the capacity to engage in any sort of physical action. So, to put it simply, we may describe energy as:

The capacity to perform work is energy. Energy "can neither be created neither destroyed but must instead be converted forms one form to another," according to the rules of conservation of energy. The SI unit for energy is called a joule.

Q = m× Lvapor

    =m×293.4 kJ/mol

    =3440 kJ

Therefore, 3440 kJ is the energy that is required to vaporize 2 kg of aluminum.

To know more about energy, here:

https://brainly.com/question/1932868

#SPJ7

Answer:

Write 2 behind the NaCl so it becomes 2NaCl and 2 behind the NaF so it becomes 2NaF. The others take 1 each

Explanation:

The coefficients of the given balanced chemical equation are 2, 1, 2, 1.

A chemical equation can be defined as the representation of a reaction in terms of symbols of the reactants and products. A chemical equation has of reactants contributing to the reaction, formed products.

The equation which contains the number of atoms of substances that is equal on either side of the equation is known as a balanced chemical equation.

The law of conservation of mass has to be followed by a balanced chemical equation. By obeying this law, the total mass of reactants in the chemical reaction should be equal to the total mass of the products in a balanced chemical equation.

The given equation of the reaction of sodium chloride and fluorine is:

[tex]NaCl + F_2 \longrightarrow NaF + Cl_2[/tex]

The balanced chemical equation for the above reaction NaCl ad F₂ is:

[tex]2NaCl + F_2 \longrightarrow 2NaF + Cl_2[/tex]

Therefore the coefficients to balance the given equation are 2, 1, 2, 1.

Learn more about the balanced chemical equation, here:

brainly.com/question/15052184

#SPJ2

Malaria  is transmitted indirectly through a vector.Another word for communicable diseases is infectious.Botulism is a bacteria caused illness found in raw eggs. It causes diarrhea symptoms. The transmission of this disease would best be described as oral -fecal.

Communicable diseases are defined as diseases or  illnesses which spread from one person to another or from an animal to a person, or from a surface or a food. Diseases can  also be transmitted during air travel through:

1) direct contact with a sick person

2) respiratory droplet spread from a sick person  while sneezing or coughing

3) contact with blood or other body fluids

4)  inhalation of viruses or bacteria present in the air

5)contact with a contaminated surface or object

6) bites from insects or animals that can transmit the disease

7) ingestion of contaminated food or water

Learn more about communicable diseases,here:

https://brainly.com/question/27330218

#SPJ3

Answer:

34.8 L of hydrogen gas

Explanation:

Now we have to use the ideal gas equation;

PV= nRT

P= pressure of the gas= 3.22atm

V= volume of the gas = ?????

T= temperature of the gas = 45°C +273= 318K

n= number of moles =4.3 moles

R= universal gas constant= 0.082atm Lmol-1K-1

Making V the subject of the formula

V= nRT/P

V= 4.3×0.082×318/3.22

V= 34.8 L

Answer:

34.82 L

Explanation:

Step 1:

Data obtained from the question:

Number of mole (n) = 4.3 mole

Temperature (T) = 45°C = 45°C +273 = 318K

Pressure (P) = 3.22 atm

Volume (V) =?

Step 2:

Determination of the volume hydrogen gas.

With the application of the ideal gas equation, the volume of Hydrogen gas can be obtained as follow:

Note that the gas constant (R) = 0.082atm.L/Kmol

PV = nRT

3.22 x V = 4.3 x 0.082 x 318

Divide both side by 3.22

V = (4.3 x 0.082 x 318) /3.22

V = 34.82 L

Therefore the volume occupied by the hydrogen gas is 34.82 L

Answer:

1025.08

Explanation:

Answer:

1.025e+6 joules

Explanation:

Answer : The negative value indicate about the reaction is exothermic and heat is released.

Explanation :

Enthalpy of a reaction (ΔH): It is defined as the energy change that takes place during the chemical processes. It is represented as, ΔH.

If the heat is absorbed during the chemical process then the enthalpy of reaction is positive.

If the heat is released during the chemical process then the enthalpy of reaction is negative.

That means,

When the value of enthalpy of reaction is negative then the heat is released and the reaction will be exothermic reaction.

When the value of enthalpy of reaction is positive then the heat is absorbed and the reaction will be endothermic reaction.

Final answer:

A negative ∆H in calorimetry signifies an exothermic reaction where heat is released by the system to the surroundings.

Explanation:

A negative ∆H in a calorimetry investigation indicates that the reaction is exothermic, meaning heat is released by the system to the surroundings.

For example, if the enthalpy change is negative in the combustion of methane, it signifies that heat is being given off by the system.

In calorimetry, negative ∆H values represent energy being transferred from the system to its surroundings in exothermic reactions.

Answer:

Explanation:

Copper is a single element, not made up of anything but copper.

Salt is an element, as it is made up of multiple things, such as chlorine and sodium, but are combined per molecule. Jelly beans are made up of multiple elements, but are a mixture as they are not all the same. there isn't a single "jelly bean" molecule that is uniform throughout them.

Answer:

V = 3.89 L

Explanation:

Given data:

Mass of oxygen  = 5.024 g

Temperature = 28°C (28+273 = 301 k)

Pressure = 0.988 atm

Volume occupy by oxygen = ?

Solution:

PV = nRT

We will calculate the number of moles;

Number of moles = mass/ molar mass

Number of moles = 5.024 g/ 32 g/mol

Number of moles = 0.157 mol

Now we will calculate the volume,

PV = nRT

V = nRT/P

V = 0.157 mol × 0,.0821 atm.L /mol.K × 301 K / 0.998 atm

V = 3.88 L / 0.998

V = 3.89 L

Answer:

second

convection current

first

lithosphere

Explanation:

xoxo

Demi

Answer: 0.37 m/s

Explanation:

Given that:

Velocity of object = ?

Mass of object = 17.6 kg

kinetic energy of object = 1.19 J

Since kinetic energy is the energy possessed by a moving object, and it depends on the mass of the object and its velocity, apply the formula

K.E = 1/2 x mass x velocity^2

1.19J = 1/2 x 17.6kg x velocity^2

1.19J = 8.8kg x velocity^2

velocity^2 = 1.19J / 8.8kg

velocity^2 = 0.135

To get the value of velocity, find the square root of 0.135

velocity = √0.135

Velocity = 0.367 m/s (Rounded to the nearest hundredth as 0.37m/s)

Thus, the velocity is 0.37 m/s

These models are similar because "both the nuclear model and the solar system model have concept of nucleus, electron, positively charged nucleus at center and electrons orbiting around the nucleus".

Explanation:

The points which showcase similarities among both the atomic structure and the composition of the solar system are like the large percentage of the mass centered in the core which is the nucleus or the sun. Attractive forces bring the structure together by application of electromagnetic force or gravitational force.

The existence of the external objects influences the stable state of other surrounding objects as suggested by Pauli theory of exclusion and gravitational disturbance. Overall on the basis of the view only, in both the model their is similarity like atomic model speaks about electrons orbiting the nucleus similar to planets orbiting the sun.

The percentage of water in the hydrated lithium nitrate is calculated by subtracting the mass of the dehydrated compound from the initial mass of the hydrated compound. The result is the mass of water, which is then divided by the initial mass of the hydrated compound and multiplied by 100 to give the percentage of water.

A chemist started with a hydrated lithium nitrate which weighed 170 grams. After heating it and driving off the water of hydration, the mass of the sample reduced to 95.3 grams. This mass reduction is due to the loss of water molecules.

The chemist found that the mass of water lost is 170 grams − 95.3 grams = 74.7 grams. Therefore, the percentage of water in the hydrate can be calculated by dividing the mass of the water lost by the initial mass of the hydrate and then multiplying by 100%.

Using this method, the percentage of water in the hydrated lithium nitrate can be calculated as: (74.7 grams/170 grams)*100% = 43.94%. Therefore, approximately 44% of the mass of the hydrated lithium nitrate is water.

https://brainly.com/question/33725459

#SPJ12