write this number in scientific notation 41, 820, 000

The energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

The term enthalpy is defined as the sum of the system's internal energy and the product of its pressure and volume.  

Ice warming Cs = 2.09 J/g∙°C

Enthalpy of fusion ∆H = 6.02 kJ/mol

Liquid water warming Cs = 4.18 J/g∙°C

Enthalpy of vaporization ∆H = 40.7 kJ/mol

Steam Warming Cs = 2.01 J/g∙°C

Step 1: Warm ice from −15.0°C to 0°C.

q1 = 470.25 joule

Step 2: Melt ice.

q2 = 5016.66

Step 3: Warm liquid water from 0°C to 45.0°C.

q3 = 2821.5 joule

The total energy is the sum of the energy of each step.

q = q1 + q2 + q3

= 470.25 + 5016.66 + 2821.5

= 8.30kj

Thus, energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

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Answer:

matter is anything that occupies space and mass

Answer: In physics and chemistry, the law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

Explanation: Hope this help :D

Answer:

Garnet is a hard transparent mineral that is often used as gemstones and abrasives and quartz is the most abundant mineral on the earth's surface. They are both minerals that come out of the earth and that's about the most they have in common.

Explanation:

I got this answer correct.

The minerals quartz and garnet are both composed of silica but they differ in their color of crystals .

Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.

If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.

Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.

Physical properties of minerals include color,streak, luster,specific gravity and cleavage.

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Answer:

It comes from the sun.

Following the formula they gave you need to do

i × kb × mass

1 × 2.65 × 2

= 5.3

Change in temperature should be 5.3°C

Answer:

\(\boxed {\boxed {\sf molarity \approx 0.722 \ M \ HCl}}\)

Explanation:

Molarity is the concentration measurement equal to moles per liter.

\(molarity=\frac{moles}{liters}\)

We have 26.0 grams of HCl and 1.00 liters of water. We must convert grams of HCl to moles.

To convert from grams to moles, the molar mass is used. Usually we find these values on the Periodic Table, but they are already provided. The molar mass of hydrochloric acid is 36.0 grams per mole. Use this number as a ratio.

\(\frac {36.0 \ g \ HCl}{ 1 \ mol \ HCl}\)

Multiply by the given number of grams: 26.0

\(26.0 \ g \ HCl *\frac {36.0 \ g \ HCl}{ 1 \ mol \ HCl}\)

Flip the ratio so the grams of hydrochloric acid cancel.

\(26.0 \ g \ HCl *\frac {1 \ mol \ HCl}{ 36.0 \ g \ HCl}\)

\(26.0 *\frac {1 \ mol \ HCl}{ 36.0 }\)

\(\frac {26.0}{ 36.0 } \ mol \ HCl = 0.72222222222 \ mol \ HCl\)

Now we know the moles and liters.

Substitute these values into the molarity formula.

\(molarity = \frac {0.72222222222 \ mol \ HCl}{1.00 \ L }\)

\(molarity = 0.72222222222 \ mol \ HCl/L\)

The original measurements of grams and liters have 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.

The 2 tells us to leave the 2 in the thousandth place.

\(molarity \approx 0.722 \ mol \ HCl/ L\)

1 mole per liter is equal to 1 molar, or M. Change the units.

\(molarity \approx 0.722 \ M \ HCl\)

The molarity of this solution is approximately 0.722 M HCl

Answer:

the atoms in the metals form a matrix through which outer electrons can move freely. 

Explanation:

A flow of charged particles is an electric current. A metal has a built in supply of charged particles that can flow from one location to another- the pool of shared electrons.

The temperature of boiling water is used as the initial temperature of the metal in certain experiments because it serves as a known reference point for temperature. By using the boiling point of water, which is 100°C at standard atmospheric pressure, we can establish a consistent and easily reproducible starting temperature.

This choice of temperature allows for more accurate calculations of heat transfer and the determination of specific heat. Specific heat is a property of a substance that quantifies how much heat energy is required to raise the temperature of a unit mass of the substance by one degree Celsius (or Kelvin). It is denoted by the symbol "c" and has units of J/(g·°C) or J/(g·K).

By measuring the change in temperature of the metal when it comes into contact with boiling water, we can apply the principles of heat transfer and specifically calculate the heat absorbed or released by the metal. This can be done using the equation:

Heat (Q) = Mass (m) * Specific Heat (c) * Change in Temperature (ΔT)

Since the initial temperature of boiling water is known (usually taken to be 100°C), and assuming there is no heat loss to the surroundings, we can measure the change in temperature of the metal when it reaches thermal equilibrium with the water.

Overall, by using the known temperature of boiling water as the initial temperature, we simplify the experimental setup and enable accurate calculations of heat transfer and determination of specific heat, crucial factors in understanding the thermal properties of materials.

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Answer:

New growth of trees is an exception

Explanation:

when volcanoes erupt, they release hot magma that is destructive to the environment causing personal damage, lack of breathable air and death.

heat produce cannot in any way help in growth of trees

During chemistry class, carl performed several lab tests on two white solids. The results of three tests are seen in the data table. Based on this data, carl has concluded that substance b must have ionic bonds.

The complete transfer of certain electrons from one atom to another results in the formation of an ionic connection. A negatively charged ion known as a cation results from an atom losing one or more electrons. An anion, or negatively charged ion, is created when an atom gains one or more electrons.

If the electronegativity of the two atoms differs by enough to allow one to totally draw an electron away from the other, the connection is ionic. Compounds that mix elements from the left-hand side of the periodic table frequently encounter such circumstance (sodium, potassium, calcium, etc.)

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Answer: SORRY FOR TAKING TOO LONG

Fog is the kind of weather that usually forms over the northwest United States in the summer because of maritime polar air masses. Maritime polar air masses are cool and moist, and when they move over the relatively warmer waters of the Pacific Ocean, they can pick up moisture and become even more humid. When this humid air reaches the cooler air over the land, it can create fog, which is common in the coastal areas of the Pacific Northwest during the summer months.

A system of linear equations to balance the following chemical reaction:

Limestone, CaCO₃, neutralizes the acid, H₃ O, in acid rain is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

To balance the chemical equation:

H₃O + CaCO₃ → H₂O + Ca + CO₂

We need to ensure that the number of atoms of each element is the same on both sides of the equation.

Let's assign variables to the coefficients of each compound:

H₃O: x

CaCO₃: y

H₂O: z

Ca: a

CO₂: b

Now, we can set up the system of equations based on the number of atoms for each element:

For hydrogen (H):

3x = 2z

For oxygen (O):

3x + 3y = 2z

For calcium (Ca):

y = a

For carbon (C):

y = b

For calcium (Ca):

a = 1

Solving this system of equations will give us the balanced coefficients. Let's solve it:

From the equation y = a, we have y = 1.

From the equation y = b, we have b = 1.

Substituting b = 1 into the equation 3x + 3y = 2z, we have:

3x + 3 = 2z

From the equation 3x = 2z, we have x = (2/3)z.

Substituting x = (2/3)z into the equation 3x = 2z, we have:

3(2/3)z = 2z

2z = 2z

This equation is true for any value of z, indicating that z can take any value.

Therefore, we can choose z = 3 to simplify the coefficients:

x = (2/3)z = (2/3)(3) = 2

y = 1

z = 3

a = 1

b = 1

Thus, the balanced equation is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

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Particles in a gas do not interact with one another via either attracted or repulsive forces.

When compared to the volume of the container, the real volume of the gas particles is very tiny.

Because of their microscopic size, the particles take up a little amount of space in comparison to the volume that the gas occupies. There is no interaction between the particles. There are no forces that can be described as attracting or repulsive between them. The temperature has a direct relationship with the average kinetic energy of the particles in the gas.

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In a gas, there are no interactions between the particles due to either attracted or repellent forces.

The actual volume of the gas particles is negligible compared to the container volume.

The actual volume of the gas particles is incredibly little when compared to the volume of the container. The microscopic size of the particles means that they only occupy a small portion of the volume that the gas does. The particles don't interact with one another. Between them, there are no forces that can be defined as attracting or repelling. The average kinetic energy of the gas's particles is directly related to temperature.

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Answer:

Mass is lost due to the conversion of mass to energy

Explanation:

The question is not complete, the complete question is given as:

        \(^{235}_{72}U +^{1}_{0}n\)                       ⇒        \(^{140}_{56}Ba+^{93}_{36}Kr+3^{1}_{0}n+energy\)

total mass equals 236.053 u              total mass equals 235.868 u

Which statement explains the energy term in this reaction? (1) Mass is gained due to the conversion of mass to energy. (2) Mass is gained due to the conversion of energy to mass. (3) Mass is lost due to the conversion of mass to energy. (4) Mass is lost due to the conversion of energy to mass.

Answer: From Einstein’s equation  E = mc², when a radioisotope element undergoes fission or fusion in a nuclear reaction, it loses a tiny amount of mass.This mass lost is converted to energy.

The law of conservation of energy  holds for this type of reaction (i.e  the sum of mass and energy is remains the same in a nuclear reaction). Mass changes to energy, but the total amount of mass and energy combined remains the same before and after a nuclear reaction.

From the reaction above, the total decrease in mass = 236.053 - 235.868 = 0.185 u

Answer:

Option C

Explanation: Pass me the brainliest I only need 1

Answer:

Atomic Number = 3.

Explanation:

The number of protons determines the atomic number. Basically the number of protons is the exact same as the atomic number.

Protons 3 = Atomic number 3

Answer:

A. 35

B. 7

C. halogênios

Explanation:

Aqui, para responder a essa pergunta, precisaremos conhecer o elemento particular em questão.

..... 4s ^ 2 3d ^ 10 4p ^ 5 significa que está a cinco elétrons da configuração eletrônica do último elemento na primeira camada dos metais pesados.

O último elemento da 1ª série do elemento de transição é o zinco, portanto, como está a apenas 5 elementos de distância, o átomo de que estamos falando é o átomo de Bromo de Bromo.

A. O zinco tem um número atômico 30 e como o bromo está a 5 elementos de distância, seu número atômico é 35

B. Uma vez que pertence ao grupo halogênio, tem 7 elétrons de valência como o resto da família

C. Pertence à família dos halogênios

Some common protic solvents used in SN1 reactions include water, alcohols, and carboxylic acids.

In organic chemistry, SN1 reactions are a type of substitution reaction that occurs in a protic solvent.

A protic solvent is a solvent that has a hydrogen atom bonded to an electronegative atom, such as oxygen or nitrogen. This allows the solvent to form hydrogen bonds with the reactants and stabilize the transition state of the reaction.

These solvents are able to stabilize the carbocation intermediate that is formed during the reaction, which helps to increase the reaction rate.

It is important to note that the choice of solvent can have a significant impact on the rate and outcome of the reaction. For example, a polar protic solvent like water will favor the SN1 reaction, while a polar aprotic solvent like acetone will favor the SN2 reaction.

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In order to determine the pH in the given scenarios, several calculations and considerations need to be taken into account.Firstly, the Henderson-Hasselbalch equation can be used, which relates the pH of a solution to the pKa of the acid and the ratio of its conjugate base to the acid. This equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.

The first problem asks for the pH of a solution made by mixing 0.20 mol of acid HA with 0.30 mol of its conjugate base NaA. The pH can be calculated using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Given that the pKa is 6, we can plug in the values and solve for the pH.

The second problem asks for the pH after adding 0.05 mol of NaOH to the previous solution. Since NaOH is a strong base, it will react with the acid HA and form water.

The amount of NaOH added is small compared to the amount of acid, so we can assume that the acid will be fully neutralized. We can calculate the resulting concentration of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

The third problem involves mixing 200 mL of 0.20 M HA with 300 mL of 0.30 M NaA. We need to calculate the concentrations of the acid and its conjugate base after mixing, and then use the Henderson-Hasselbalch equation to find the pH.

The fourth problem asks for the pH after adding 10 mL of 0.50 M HCl to the previous solution. Since HCl is a strong acid, it will completely dissociate and increase the concentration of the acid HA.

We need to calculate the new concentrations of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

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Answer:

The easiest way to determine if a 1943 cent is made of steel, and not copper, is to use a magnet. If it sticks to the magnet, it is not copper. If it does not stick, the coin might be of copper and should be authenticated by an expert

Explanation:

Answer:

The state of matter is solid

Explanation:

Answer:

Chlorine I guess.

Explanation:

none

Answer:

D.

Explanation:

The electron cloud has negligible mass. Most mass come from the nucleus.

Answer:

8.9

Explanation:

According to the balanced equation, 31.7 grams of nitrogen gas (N₂) reacting with excess hydrogen gas (H₂) will produce a 2.264 moles of ammonia gas (NH₃).

To determine the moles of ammonia formed, we need to convert the given mass of nitrogen gas to moles using its molar mass and the stoichiometric ratio of the balanced equation.

The molar mass of nitrogen gas (N₂) is 28.02 g/mol. To calculate the number of moles of nitrogen gas, we divide the given mass by its molar mass:

31.7 g / 28.02 g/mol = 1.132 mol

According to the stoichiometry of the balanced equation, the ratio between nitrogen gas and ammonia gas is 1:2. This means that for every 1 mole of nitrogen gas, 2 moles of ammonia gas are produced.

Therefore, using the stoichiometric ratio, we can determine the moles of ammonia formed:

1.132 mol N₂ * (2 mol NH₃ / 1 mol N₂) = 2.264 mol NH₃

Thus, upon the complete reaction of 31.7 grams of nitrogen gas with excess hydrogen gas, 2.264 moles of ammonia gas will be formed.

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Explanation:

'Z' would be compounds ....like ' chemical compounds'  made up of elements