How are stars and comets different?

A star has a solid rock and gas surface, while a comet has tail of dust and gas.
A star has a tail of dust and gas, while a comet has a solid rock surface.
A star is made up of burning gases, while a comet is made up of ice, gases, rocks, and dust.
A star is made up of ice, rocks, and dust, while a comet is made up of burning gases.

The most complete list of the parts of the experiment presented in this scenario include:

This refers to the procedures which are performed in other to support or refute a hypothesis. It is also used to ascertain the authenticity of the claim by other people such as scientists etc who review it.

In the scenario given, we were told that the group of identical mice is given the supplement and the other group is not given any thing which means that the control group is the one which wasn't given anything while the ones who were given something is the experimental group.

The dependent variable is the supplement which was given to the mice and is therefore the reason why option B was chosen as the correct choice.

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-78° Celsius is the temperature in units of degrees Celsius.

Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius.

195 Kelvin = 195 - 273.15 = -78.15 Celsius.

-78° Celsius is the temperature in units of degrees Celsius.

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An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Tectonic plates are huge pieces of EARTH'S LITHOSPHERE that slowly move on the ASTHENOSPHERE.

A tectonic plate is a large, rigid slab of solid rock that makes up the Earth's outermost layer, known as the lithosphere. The lithosphere is broken up into a series of tectonic plates that are in constant motion, driven by the flow of the Earth's mantle beneath them. There are several major tectonic plates, including the North American, South American, African, Eurasian, Australian, Pacific, and Antarctic plates, as well as several smaller plates. The movement of tectonic plates is responsible for a variety of geological phenomena, such as earthquakes, volcanic eruptions, mountain building, and the formation of oceanic trenches and ridges. The theory of plate tectonics provides the framework for understanding the dynamics of the Earth's crust and how it has evolved over time.

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer: the unknown gas mentioned by the question is He

Explanation:

The question requires us to identify the gas (choosing from a list given), considering the information provided.

The following data was provided by the question:

mass of gas = m = 0.542 g

volume of gas = V = 3.0 L

temperature = T = 28 °C

pressure of gas = P = 16 psi

To solve this problem, we'll need to go through the following steps:

1) Calculate the number of moles of gas considering the volume, temperature and pressure given (note that we'll need to convert the pressure and temperature to the appropriate units);

2) Calculate the molar mass of the unknown gas from the mass given by the question and the number of moles calculated;

3) Compare the molar mass obtained to the list of gases provided.

Next, we'll go through these steps to solve the problem:

1) We can apply the equation of ideal gases, shown below, to calculate the number of moles of gas using the information provided by the question:

where R is the constant of gases (0.08205 L.atm/K.mol.

Rearranging this equation to calculate n (number of moles), we'll have:

Note that, due to the units of R (L.atm/K.mol), we'll need to convert the temperature from °C to Kelvin and the pressure from psi to atm:

Therefore, the volume, temperature and pressure that will be applied to the equation of gases are, respectively, 3.0 L, 301.15K and 1.09 atm:

Therefore, the amount of unknown gas in the container is 0.13 mol.

2) Next, we must use the mass given (0.542g) and number of moles calculated (0.13 mol) to obtain the molar mass of the gas.

Knowing that the number of moles of a substance can be obtained by dividing the mass of the sample by its molar mass, we can write:

Thus, applying the values obtained so far:

Therefore, the molar mass of the unknown gas is 4.1 g/mol.

3) At last, we must compare the molar mass obtained with the gases provided by the question. Among the gases given, only He presents molar mass close to the value obtained (molar mass of He gas = 4.00 g/mol).

Therefore, the unknown gas mentioned by the question is He.

Answer:

D. 110 Joules

Explanation:

Work = Force x Distance

The given force here is 55 Newtons, and the distance the object moved against the force is 2 meters.

Therefore 2 x 55 = 110 Joules of Work.

Hope this helped!

In a pure solvent, the freezing point is a constant. The presence of solute causes the freezing point of the solvent to decrease. The solvent's freezing point is depressed.

A solution's freezing point is lower than that of the pure solvent's. This indicates that freezing can only take place when a solution is lowered to a lower temperature than the pure solvent. Road salting in water is a relatively prevalent example of this occurrence in daily life. At 0°C, pure water freezes. In a pure solvent, the freezing point is the temperature at which the solvent will form a solid. The presence of solute particles interferes with the ability of the solvent molecules to form a solid, causing the freezing point to decrease. The solvent's freezing point is thus lowered or "depressed" by the addition of solute particles.

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The change to the reactants that would accomplish increase in reaction rate is increase in concentration of reactant.

Reaction rate is the speed at which a chemical reaction proceeds.

It is expressed in terms of either the concentration of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

Here, a student wants to increase the rate of a reaction that involves gases.

The increase in reaction rate will be result of increase in concentration of reactant.

In case of gases, it can be done via:

Increasing the pressure and decreasing the volume.

Hence, the change to the reactants that would accomplish increase in reaction rate is increase in concentration of reactant. Increasing the pressure and decreasing the volume are ways to accomplish this.

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Answer:

The atomic mass of methane (CH4)is 12 amu for the carbon plus 4 x 1 amu for the four hydrogens, for a total of 16 amu. Therefore, the molar mass of methane is 16g.

Answer:

The answer is option D

Explanation:

This is because Mrs. Linde resolves the conflict by committing to a new life with Krogstad, which develops the theme that new beginnings are always possible.

The conflict in this passage develops a theme, as Mrs. Linde resolves the conflict by committing to a new life with Krogstad, which develops the theme that new beginnings are always possible. Option D.

A conflict is defined as a battle or disagreement. A dispute over parenting techniques is an example of conflict, the two parties not seeing eye to eye.

In conclusion, The passages conflict develops the theme that new beginnings are always possible.

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The balanced equation is: 4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

The given chemical equation is unbalanced. To balance it, we need to adjust the coefficients in front of each chemical species until the number of atoms on both sides of the equation is equal.

The unbalanced equation is:

2 \(H_2S\)+ 3 \(O_2\)→ \(SO_2\)

Let's start by balancing the sulfur (S) atoms. We have two sulfur atoms on the left side and one sulfur atom on the right side. To balance the sulfur, we can place a coefficient of 2 in front of the \(SO_2\):

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)

Now, let's balance the hydrogen (H) atoms. We have four hydrogen atoms on the left side (2 from each \(H_2S\)) and none on the right side. To balance the hydrogen, we can place a coefficient of 4 in front of the water (H2O) on the right side:

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

Finally, let's balance the oxygen (O) atoms. We have six oxygen atoms on the right side (3 from \(O_2\) and 3 from 2 \(SO_2\)) and three on the left side (2 from \(H_2S\)). To balance the oxygen, we can place a coefficient of 3/2 in front of the O2:

2 \(H_2S\)+ (3/2) \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

To remove the fractional coefficient, we can multiply all coefficients by 2:

4 \(H_2S\) + 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

Now the equation is balanced, with an equal number of atoms on both sides. The balanced equation is:

4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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to generate steam which act on copper

1.98 moles of ethene gas is contained in a 19.8 L tank that has a pressure of 2.52 atm at a temperature of 306 K.

The ideal gas law states that the pressure, temperature and volume of a gas are associate to each other. It is also called as real gas law.

Given:

Volume =  19.8 L

Pressure =  2.52 atm

Temperature = 306 K

Number og moles of ethene gas = ?

R = gas constant =  0.0821

According to ideal gas law,

PV = nRT

n = PV/RT

By substituting given values in above equation and we get

n =  2.52 × 19.8 / 0.0821 × 306

n = 1.98 moles

Thus, 1.98 moles of ethene gas is contained in a 19.8 Litre.

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The birth weight of cats at the 90th percentile would be approximately 3.7 ounces. b. The birth weight of cats at the 10th percentile would be approximately 2.3 ounces.

There are three main methods of calculating weight:

1. Balance Beam Scale: A balance beam scale is an example of a mechanical weighing system. It uses a set of calibrated weights to measure the weight of an object.

2. Digital Scale: A digital scale uses an electronic or digital readout to display the weight of an object.

3. Calipers: Calipers are devices used to measure the distance between two points, such as thickness or diameter. They come in various sizes and shapes, depending on the type of measurement the user wants to take.

Birth weight is the weight of a baby at the time of birth. It is usually measured soon after delivery, with a special baby scale, though sometimes the baby's weight is estimated. The normal range of birth weight is anywhere between 5 lbs 8 oz and 10 lbs, though preterm or premature babies may be significantly lighter. A baby's birth weight is important because it can provide a clue to the baby's overall health. High birth weights may indicate an underlying medical condition, and low birth weights can be a sign of premature or difficult delivery and health risks associated with such a delivery.

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Answer:

municipal

Explanation:

I got state and federal wrong and after it told me it was municipal and if you where wondering I got the answers wrong on purpose to answer this one the fastest but at least I am going you the correct answer not like other people who just say a answer just because they want to but I actually got the right answer but yeah. BYEEEEEE

Answer:

municipal

Explanation:

did it and got it right

i hope you have you a great day

Answer:

We have the final answer as

\(4.69 \times {10}^{ - 19} \: \: J\)

Explanation:

To find the energy of a photon of this light we use the formula

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

f = 7.08×10¹⁴ Hz

We have

E = 7.08×10¹⁴ × 6.626 × 10-³⁴

We have the final answer as

\(4.69 \times {10}^{ - 19} \: \: J\)

Hope this helps you

In the first option , the order of decrease in electronegativity is Li, Na and K.  In second option, the order is  Ca, K, Sc The order in the third group is S, As, Sn.

Electronegativity of an atom is the ability of its nucleus to attracts the share pair of electrons towards it. Elements like, fluorine, oxygen, nitrogen etc .are  highly electronegative.

In periodic table, along a period electronegativity increases. Whereas down  group, electronegativity decreases. The first groups elements are Li, Na , K and Cs and Fr. Hence, electronegativity decreases from Li to K.

Among, K, Sc and Ca, Ca is comparatively electronegative than K. Sc is a transition metal and not electronegative. In the last group the S is mot electronegative than As more than Sn.

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The final concentration of the solution would be 0.93 M.

According to the dilution principle, the number of moles before dilution must be equal to the number of moles after dilution. This can be mathematically represented by:

\(m_1v_1 = m_2v_2\)

Where \(m_1\) and \(m_2\) are initial and final concentrations, while \(v_1\) and \(v_2\) are initial and final volumes of the solution.

In this case:

\(m_1\) = 4.0 M

\(v_1\) = 230 mL

\(v_2\) = 990 mL

Substituting each of these variables into the dilution equation and making the final concentration the subject of the formula, we have:

\(m_2\) = \(m_1v_1/v_2\)

    = 4x230/990

   = 0.93 M

In other words, the final concentration after diluting 230 mL of a 4.0 mol/L sodium chloride soltuion to a final volume of 990 mL would be 0.93 M.

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The atomic mass of the reactants equals the atomic mass of the product, and the product has the same.

The conservation of mass is a fundamental principle in physics and chemistry that states that the total mass of a system remains constant, regardless of any changes that take place within the system. In other words, mass cannot be created or destroyed, only transformed from one form to another.

This law applies to both physical and chemical processes, and is a key concept in fields such as thermodynamics, mechanics, and material science. It forms the basis for our understanding of the behavior of matter and energy in the universe, and is widely used in scientific and engineering calculations and experiments.

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Answer:

1. the reactants and the products have the same number of atoms of the same elements

2. the mass of one titanium atom is equal to the mass of four carbon atom

3. The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants.

4. 80amu

5. A molecule with two atoms combined with a molecule with three atoms to produce a molecule with a mass of 84 u.

Explanation: got 100% hope you get the same!

Answer:

d. selenium (Se) I’m a non metal

Explanation:

What we know about the element in view is that it has:

              4 orbitals

              6 valence electrons

The orbitals are the energy levels in the element.

Valence electrons are the outermost shell electrons.

The orbitals tells us the periods in which an element belongs. Since we have 4 orbitals, this suggests that our element belongs to the 4th period.

The number of valence electrons tells us the group in which the element could be found. Since we have 6 valence electrons, the group number is 6.

Therefore, the element is period 4 and group 6 is selenium. Selenium is a non-metal.

Answer: SiO2 has more electrons and stronger London dispersion forces.  

MgSO4.7H2O

First of all, we need to calculate the molar mass of this molecule, using the periodic table.

Let's take each atomic mass of the elements that form this molecule from the periodic table.

Mg = 24.30 u

S = 32.06

O = 15.99 u

H = 1.007 u

Now, we have to do this:

Molar mass (g/mol) = 1 x 24.30 + 1 x 32.06 + 4 x 15.99 + 14 x 1.007 + 7 x 15.99

Molar mass = 246.3 g/mol

We have to be careful with this result because 246.3 g is the mass of 1 mole of MgSO4.7H2O and we want the mass of 1 formula unit or molecule.

Pay attention to this:

1 mole of MgSO4.7H2O = 246.3 g = 6.022 x 10^23 formula units or molecules of MgSO4.7H2O

(We want the mass of 1 molecule and we have just calculated the mass of 6.022x10^23 molecules)

----------------------------------------------------------------------------------------------------------------

For 1 formula unit or molecule:

246.3 g of MgSO4.7H2O ------------- 6.022 x 10^23 formula units or molec.

x ------------- 1 formula unit or molec.

Answer: The mass of 1 formula unit or molecule of MgSO4.7H2O = 4.09x10^-22 g

To find the density of the unknown piece of metal, we can use the formula:

Density = mass / volume.

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The jumbled word "gzeysktqix" can be unscrambled to form the word "skyzigtext."

Here are possible words that can be made from this jumbled word:

Sky: Referring to the atmosphere above the Earth.

Zig: Describing a series of sharp turns or angles.

Text: Referring to written or printed words.

Six: The number following five and preceding seven.

It seems that the jumbled word has provided a mix of letters that can be rearranged to form these words. This exercise is likely intended to enhance the student's vocabulary skills, spelling ability, and problem-solving skills. By unscrambling the letters, the student is encouraged to explore different word possibilities and apply their knowledge of language. It also promotes critical thinking and creativity as they find valid words from the given set of letters.

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The average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.

The density of a substance is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated using the following formula:

D = m/v

Where;

According to this question, a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm.

Volume = 7.0cm X 17.0.cm X 19.0 cm = 2261cm³

1 cubic centimetre = 0.001 litre

2261cm³ = 2.261L

Density of the crackers = 0.25kg ÷ 2.261L

Density = 0.1105Kg/L

Therefore, the average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.

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