What is the mass number of hydrogen? DUE TODAY!!!!

Answer:

1.Formation of Gas

2.Color Change

3.

Formation of a precipitate

4.Energy Change

Explanation:

Here are four signs that a chemical change has occurred:

1. Formation of a gas: If a gas is formed during a reaction, it indicates a chemical change. For example, if you mix baking soda and vinegar, carbon dioxide gas is produced.

2. Color change: If the color of the substances changes, it is often a sign that a chemical change has occurred. For example, when iron rusts, it changes from a silver color to a reddish-brown color.

3. Formation of a precipitate: A precipitate is a solid that forms from a solution during a chemical reaction. If a precipitate forms, it indicates that a chemical change has occurred. For example, when you mix silver nitrate and sodium chloride, silver chloride precipitates out of the solution.

4. Energy change: If energy is absorbed or released during a reaction, it is a sign that a chemical change has occurred. For example, when you burn a piece of paper, it releases energy in the form of heat and light.

If one electron is removed from sodium during a reaction energy level becomes the valence shell is outermost shell

Electrons are the smallest of the particles that make up an atom, and they carry a negative charge a neutral sodium atom is likely to achieve an octet in its outermost shell by loosing its one valence electron the cation produce in this way is Na⁺ is called as sodium ion distinguish it from element and the outermost shell of sodium ion is the second electron shell which has eight electrons in it

Know more about valence shell

https://brainly.com/question/20861869

#SPJ1

In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals

In the case of the equilibrium reaction provided, if the concentration of Co(H2O)2+ is increased, the reaction will shift to the right in order to consume the excess Co(H2O)2+ and produce more CoCl2 and H2O.

Conversely, if the concentration of CoCl2 is increased, the reaction will shift to the left in order to consume the excess CoCl2 and produce more Co(H2O)2+ and Cl- ions.

According to Le Chatelier's principle, a change in concentration of one or more of the reactants or products of a chemical reaction at equilibrium will cause a shift in the equilibrium position to counteract the change and re-establish equilibrium.

Specifically, if the concentration of one of the reactants is increased, the reaction will shift in the direction that consumes that reactant in order to restore equilibrium.

Learn more about chemical equilibrium at: https://brainly.com/question/18849238

#SPJ1

Answer:

5.7 pH

Explanation:

To find pH when given [H+], you use this formula: pH = -log[H+]

-log * 2.1e-6 = 5.6778 = 5.7 pH

The total energy needed to change 25 grams of water at 75 degrees to water vapor at 125 degrees is 60333.75 J

First, we shall determine the heat needed to change the water from 75 °C to 100°C. Details below:o

H₁ = MCΔT

H₁ = 25 × 4.184 × 25

H₁ = 2615 J

Next, we shall determine the heat needed to vaporize the water. Details below:

H₂ = m × ΔHv

H₂ = 25 × 2259

H₂ = 56475 J

Next, we shall determine the heat needed to change the steam from 100 °C to 125°C. Details below:

H₃ = MCΔT

H₃ = 25 × 1.99 × 25

H₃ = 1243.75 J

Finally, we shall determine the total heat needed to change the water from 75 °C to 120°C. Details below:

Q = H₁ + H₂ + H₃

Q = 2615 + 56475 + 1243.75

Total heat needed = 60333.75 J

Thus, we scan conclude that the total heat needed is 60333.75 J

Learn more about heat transfer:

https://brainly.com/question/25878495

#SPJ1

Answer:

I think it is option (b) river

The river flows is not driven by pressure differences.

Conclusively we can say that the river flows is not driven by pressure differences

Learn more from:

https://brainly.com/question/10152119

A pi bond is the result of the d) sideways overlap of two parallel p orbitals.

Pi bonds are bonds that occur as a result of overlapping orbitals of atoms that are not in the bond axis. Each p orbital that contributes to a pi bond has two lobes and has a node at the core.

The pi orbital can hold a maximum of two pairs of electrons. Whereas each electron in a pi bond is also called a pi electron, the pi electrons are used for double bonds or triple bonds. The 2p orbital of carbon has slightly higher energy than the sp2 orbital, so the pi bond formed from two 2p orbitals has somewhat higher energy and is slightly less stable than the sp2-sp2 sigma bond.

Learn more about  pi bonds at:

https://brainly.com/question/13243902

#SPJ4

1) Beryllium. This element is in the second group and the second period. The atomic number is 4 which is the number of protons.

The mass number is the sum of neutrons and protons.

Assuming the element has no charge the number of electrons is equal to the number of protons.

Protons: 4.

Neutrons: the mass number - the atomic number = 9 - 4 = 5.

Electrons: 4.

Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.

learn more about atom  here:

https://brainly.com/question/13654549

#SPJ4

According to the graph, the concentration of A decreases with time before leveling out. Option A.

The reaction shown is that of a reversible reaction in which A is on the reactant's side and A2 is on the product's side.

At the beginning of the reaction, the concentration of A decreases as a result of forming A2. In other words, the concentration of A2 increases just as that of A decreases.

With time, the reaction reaches an equilibrium during which the rate of formation of A equals the rate of formation of A2. At this point, the concentration of A levels off.

In summary, the concentration of A first decreases before leveling off.

More on reversible reactions can be found here: https://brainly.com/question/31950205

#SPJ1

When Chae and Bernie were ice-fishing at a frozen pond where the temperature was -4⁰C, the thermal energy of the ice was transferred to the boys' bodies, as well as some of the water on the ice.

When Bernie stepped onto the ice, some of the thermal energy from his body was transferred to the water on his glove, causing it to become wet. As the water on the glove cooled in the cold air, the thermal energy of the water was released, causing the glove to become colder.

The thermal energy of ice is the energy that is released or absorbed when the temperature of the ice changes. When ice is heated, it absorbs energy from its surroundings, which is stored as thermal energy. Conversely, when ice is cooled, it releases energy which can be used as thermal energy

Learn more about thermal energy of the ice:

https://brainly.com/question/28894941

#SPJ4

To prevent chemical splattering when working with acids, add acid to water at all times. Water is made acidic (AA).

Acid: What is it?

A substance that, when combined with specific metals, creates salts by releasing hydrogen ions into water. Acids taste sour and cause some colors to turn red. Gastric acid is one of the body's natural acids, and it can support organ function. Hydrochloric acid is an illustration of an acid. Any hydrogen-containing material that has the ability to give another substance a proton (hydrogen ion) is considered an acid. Any molecule or ion that can accept a hydrogen ion from an acid is known as a base. Typically, the sour taste of acidic compounds serves as a marker. The word "acid" is derived from the Latin word acidus, which meaning "sour," and it alludes to the astringent smell and sour flavor that many acids have.

Examples: A diluted solution of acetic acid in water gives vinegar its sour flavor. Citric acid is what gives lemon juice its tart flavor.

To learn more about  acid refers to:

brainly.com/question/25148363

#SPJ4

The number is 6.022 x 10^23 atoms/mol.

Answer:

Mole ratio is 1:1

Explanation:

The equation is:

PCl₃ +  Cl₂  →  PCl₅

We see that is correctly balanced.

1 mol of PCl₃ react to 1 mol of chlorine gas in order to produce 1 mol of PCl₅

That's why, the mole ratio is, 1:1

There is not another number than 1, at stoichiometry of reaction.

Answer: EPA regulates the production and distribution of commercial and industrial chemicals, in order to ensure that chemicals for sale and use in the United States do not harm human health or the environment.

Explanation:

The solubility of cubr(s) in distilled water is measured by  adding excess CuBr(s) to distilled water and stir the mixture until no more CuBr(s) dissolves.

The solubility of cubr(s) in an nabr(aq) solution is by adding excess CuBr(s) to a known concentration of NaBr(aq) solution and stir the mixture until no more CuBr(s) dissolves.

To measure the solubility of CuBr(s) in each solution, we need to prepare a saturated solution of CuBr(s) in each solution and determine the concentration of \(Cu^{2+}\) and \(Br^-\) ions in each solution. The solubility of CuBr(s) will be equal to the product of the concentrations of \(Cu^{2+}\) and \(Br^-\) ions.

To prepare a saturated solution of CuBr(s) in distilled water, we can add excess CuBr(s) to distilled water and stir the mixture until no more CuBr(s) dissolves. We can then filter the solution to remove any undissolved CuBr(s) and measure the concentration of \(Cu^{2+}\) and \(Br^-\) ions using suitable analytical techniques such as atomic absorption spectroscopy or ion chromatography.

To prepare a saturated solution of CuBr(s) in an NaBr(aq) solution, we can add excess CuBr(s) to a known concentration of NaBr(aq) solution and stir the mixture until no more CuBr(s) dissolves. We can then filter the solution to remove any undissolved CuBr(s) and measure the concentration of \(Cu^{2+}\) and \(Br^-\) ions using suitable analytical techniques.

To prepare a saturated solution of CuBr(s) in an \(NaNO_3(aq)\) solution or a \(Cu(NO_3)^2(aq)\) solution, we can follow the same procedure as for the NaBr(aq) solution, replacing the NaBr(aq) solution with the \(NaNO_3(aq)\) solution or the \(Cu(NO_3)^2(aq)\) solution.

Once we have determined the concentrations of \(Cu^{2+}\) and \(Br^-\) ions in each solution, we can calculate the solubility of CuBr(s) in each solution using the formula:

\(solubility = [Cu^{(2+)}][Br^-]\)

where\([Cu^{2+}]\)is the concentration of \(Cu^{2+\) ions and\([Br^-]\)is the concentration of\(Br^-\) ions in the saturated solution.

Learn more about Solubility at

brainly.com/question/29661360

#SPJ4

Adding baking soda to vinegar or battery acid will bubble, but not water. If the liquid fizzles, waft your fingers over it to smell it; battery acid does not smell like vinegar. Fizzing is battery acid, not vinegar.

This is further explained below.

Generally, A little amount of baking soda might be sprinkled on top of the liquid; if the liquid is vinegar or battery acid, it will fizz, however, water will not.

In conclusion, Whether it fizzles, or wafting your fingers over the liquid to obtain a scent of it might help you discern if it has the smell of vinegar; battery acid does not smell like vinegar.

If it fizzles, however, it is not vinegar; it is the smell of battery acid.

Read more about  vinegar

https://brainly.com/question/4239583

#SPJ1

Answer:

9.5

Explanation:

that the answer I hope am correct

Answer:

The researcher should measure the difference in the amount of product at the end of the reaction.

Explanation:

Enzymes are defined as the protiens that are responsible for increasing the rate of reaction.

With the increase in temperature, the enzyme activity increases and so the rate of reaction increases. It means at lower temperature the rate of reaction decreases and the amount of product also decreases.

So, to determine the effectiveness of an enzyme at various temperatures, the difference in the amount of the product at the end of reaction should be measured.

Hence, the correct answer is "D".

To calculate the mass of the air contained in the room, you need to first find the volume of the room and then multiply it by the density of air.

The room measures 2.50 m x 5.50 m x 3.00 m, so its volume is:
Volume = 2.50 m * 5.50 m * 3.00 m = 41.25 m³

Since the density of air is given in g/dm³, we need to convert the volume from m³ to dm³:
41.25 m³ * (100 dm/m)³ = 41,250 dm³

Now multiply the volume by the density of air to find the mass:
Mass = Volume * Density = 41,250 dm³ * 1.29 g/dm³ = 53,212.5 g

Since the mass is given in kg for options A and D, convert the mass from g to kg:
53,212.5 g * (1 kg/1000 g) = 53.21 kg (rounded to two decimal places)

The mass of the air contained in the room is approximately 53.21 kg, which is closest to option D) 53.2 kg.

Learn more about density of air here:

https://brainly.com/question/3814070

#SPJ11

The mass fraction of the solute in the solution, given that 89 g of sodium nitrate is dissolved in the solution is 0.279

The following data were obtained from the question:

Mass fraction of solute = mass of solute / Total mass of solution

Inputting the given parameters, we have:

Mass fraction of solute = 89 / 319

Mass fraction of solute = 0.278

Thus, from the above calculation, we can conclude that the mass fraction of the solute is 0.279

Learn more about mass fraction:

https://brainly.com/question/14470971

#SPJ1

Given Figure 2 below shows a set of contour lines for temperature, and the question wants you to complete a simple analysis of temperature. The analysis should be made for the 75 and 70°F isotherms. The 80°F contour is also to be analyzed.

Figure 2 From the image above, we can identify the following contour lines and their values:Contour line C1 is for a temperature of 60°F.Contour line C2 is for a temperature of 65°F.Contour line C3 is for a temperature of 70°F.Contour line C4 is for a temperature of 75°F.Contour line C5 is for a temperature of 80°F.Using the given information, we can then proceed to answer the questions as follows:Analysis for the 75°F isotherm Contour line C4 shows a temperature of 75°F. This means that any point lying on this contour line has a temperature value of 75°F. Therefore, we can conclude that the following regions have a temperature of 75°F:Region A: This region is enclosed by contour lines C3 and C4.

Thus, it has a temperature of 75°F.Region B: This region is enclosed by contour lines C4 and C5. Thus, it has a temperature of 75°F.Analysis for the 70°F isotherm Contour line C3 shows a temperature of 70°F. This means that any point lying on this contour line has a temperature value of 70°F. Therefore, we can conclude that the following regions have a temperature of 70°F:Region C: This region is enclosed by contour lines C2 and C3. Thus, it has a temperature of 70°F.Region D: This region is enclosed by contour lines C3 and C4. Thus, it has a temperature of 70°F.Analysis for the 80°F contourContour line C5 shows a temperature of 80°F. This means that any point lying on this contour line has a temperature value of 80°F. Therefore, we can conclude that the following regions have a temperature of 80°F:Region E: This region is enclosed by contour lines C4 and C5. Thus, it has a temperature of 80°F.

To know more about point lying visit:-

https://brainly.com/question/30174758

#SPJ11

A. Fe3+. This is because Fe3+ has a higher charge than Ca2+ and Na+, which means it has a stronger attraction to the water molecules and therefore causes more disruption to the water's ability to vaporize.

Additionally, the concentration of Fe3+ ions would need to be much lower than Ca2+ and Na+ ions to have the same effect on the boiling point of water due to its higher charge.
The boiling point elevation depends on the number of ions present in the solution. In this case, if all ions have equal concentration, Fe3+ (A) will contribute most to elevating the boiling point of H₂O, because it has the highest charge and will produce more ions when dissolved in water.

Visit here to learn more about molecules brainly.com/question/19922822
#SPJ11

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.

For more question on Levoxyl click on

https://brainly.com/question/29924433

#SPJ11

Explanation:

2,2,4,4tetramethyl pentane

Answer:

Lithium Fluoride.

Explanation:I know science.

Answer:

Not sure about this one, sorry

Explanation:

Answer:

B - CALCIUM

Explanation:

Hopes it helps