If an isotope of an element has 40 neutrons and a mass number of 79, how many electrons must it have?

The balanced nuclear reaction is:10/5 B → 4/2 He + 6/3 Li.The balanced nuclear reaction is:137/55 Cs → 137/56 Ba + 0/-1 e Where Ba stands for Barium.

The balanced nuclear reaction for Boron-10 emits alpha particles and cesium-137 emits beta particles are as follows:Balanced nuclear reaction for Boron-10:Boron-10 emits an alpha particle, which consists of two protons and two neutrons, therefore the atomic mass of Boron-10 decreases by four, and the atomic number decreases by two, resulting in the formation of a new atom i.e. Helium-4.

Balanced nuclear reaction for Cesium-137:Cesium-137 emits a beta particle which is an electron, and when a beta particle is emitted, a neutron inside the atom changes into a proton, resulting in the formation of a new atom with the same mass number, but an atomic number that has increased by one.

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Final answer:

The radioactive decay of Boron-12 by beta particle emission can be represented by the nuclear equation ⁵B¹² → ⁵C¹² + ⁰e⁻ + γ, resulting in Carbon-12 and a gamma ray. For Cesium-137, the decay is represented by ⁵⁵Cs¹³⁷ → ⁵⁶Ba¹³⁷ + ⁰e⁻, producing Barium-137 and a beta particle.

Explanation:

The student's question requires writing balanced nuclear equations for the radioactive decay of Boron-10 and Cesium-137. However, the question has an error since Boron-10 does not usually emit alpha particles, so we will correct it to Boron-12, which undergoes beta decay:

Boron-12 emitting a beta particle and a gamma ray can be represented as:

⁵B¹² → ⁵C¹² + ⁰e⁻ + γ

In this equation, Boron-12 ( ⁵B¹² ) decays to Carbon-12 ( ⁵C¹² ) by emitting a beta particle (⁰e⁻) and a gamma ray (γ). The gamma ray represents the release of excess energy after the decay.

For Cesium-137 undergoing beta decay, the equation is as follows:

⁵⁵Cs¹³⁷ → ⁵⁶Ba¹³⁷ + ⁰e⁻

In this equation, Cesium-137 (⁵⁵Cs¹³⁷) decays to Barium-137 (⁵⁶Ba¹³⁷) by emitting a beta particle (⁰e⁻).

Answer:

the temperature of a substance while changing often times while rise or fall depending on what is happening. Say you have an ice cube and you put it into a hot soup to cool the soup down the ice cube melts due to the surrounding temperature. In other cases if you want to cool something hot like say hot water you can 1:put it in a cool place such as a refrigerator or freezer or 2:you can leave it out to cool to room temperature.

If something I said didnt make sense plz dont get mad or anything I am only in jr.high in 8th grade and the school year is still fresh so I'm trying to catch up on somethings.

Answer:

When any substance changes its state, the temperature remains constant.

Explanation:

It happens so because the amount of heat supplied during the change of state of any substance is utilized to break the intermolecular forces of attraction or other kinds of forces.

Answer:

2RbNO³ --> 2Rb + N² + 30²

Hope this helps!

The decomposition of RbNO3 can result in different products depending on the reaction conditions, and alkali metal nitrates typically decompose into their metal oxides, nitrogen dioxide, and oxygen. For an accurate balanced equation, specific details regarding the decomposition conditions are necessary.

The decomposition of RbNO3 (rubidium nitrate) would lead to the formation of rubidium nitrite (RbNO2) and oxygen (O2). However, typical nitrates of alkali metals like rubidium do not decompose into nitrites and oxygen as do nitrates of heavier metals; instead, they usually decompose into the nitrate's corresponding metal oxide, nitrogen dioxide, and oxygen. Therefore, since this behavior can be complex and context-dependent, I would need more specific information about the conditions of the decomposition to provide a precise equation.

Let's take a more generic example for illustrative purposes:

In case of RbNO3, if we were to speculate a similar simple decomposition, a balanced chemical equation might be:

2 RbNO3 → 2 RbNO2 + O2.

However, this is just a hypothetical example and should not be taken as the actual decomposition of rubidium nitrate. Understanding the decomposition of such compounds requires knowledge of the specific conditions under which the reaction occurs.

Freshness of french fries is dependent variable , time is independent variable,jar is controlled variable.

Variables are defined as any characteristics, number or quantity which can be measured . It can also be called as a data item . It is called as variable because they can vary and can have variety of values.

There are three types of variables 1) manipulated variable where in a condition is specified, 2) responding variable which is dependent on manipulated variable 3)controlled variable which do not change

Example of manipulated variables are number of hours spent by a student studying , that of responding variable is result of a student and temperature is an example of controlled variable.Variables are useful in analysis of variables.

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30 degrees from the mirror's surface

pretty sure It's correct and if it is then your welcome

The concept law of reflection is used here to find out the angle of reflected ray. The angle of reflected ray is also  27 degree. The light reflected from a mirror surface is an example of reflection of light.

The law of reflection states that the angle of reflection is always equal to the angle of incidence. Here the incident ray, reflected ray and the normal to the surface of the mirror is found to lie in the same plane.

A common reflected image is given by the the law of reflection where the distance between the object and the mirror is same as that of the distance between the image and the mirror.

The law of reflection can be shown here.

Thus the angle of reflected ray is 27 degree which is same as that of incident angle.

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Answer:

If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.

If the gas particles move more quickly, they will collide more frequently with the walls of the container  and pressure will increase.

If the gas particles move more quickly, they will collide with the walls of the container more often and  with more force, and pressure will increase.

Explanation:

The temperature of gases is a measure of the average kinetic energy of the molecules. With increasing temperature comes more kinetic energy for the gaseous particles. If temperature of the system is reduced, the particles will have less kinetic energy and would not be able to move. Temperature is directly proportional to average kinetic energy.

Pressure of gases increases when there is more frequent collision between their particles. The usual case is for gases to move more rapidly as a result of increase in kinetic energy of the system. The particles collides more frequently with one another and the walls of the container if the kinetic energy is raised.

Answer:

If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.

If the gas particles move more quickly, they will collide more frequently with the walls of the container and pressure will increase.

If the gas particles move more quickly, they will collide with the walls of the container more often and with more force, and pressure will increase.

Explanation:

Answer 12

Explanation:

Answer:

Ion formed from the atom contains 8 positive protons and 5 negative electrons

Explanation:

Atomic number = number of electrons = number of protons

So the atom contains 8 protons and 8 electrons

Protons are positively charged and electrons are negatively charged.

An ion with a positive charge (cation) is formed by the loss of negative electrons

An ion with a negative charge (anion) is formed by the gain of negative electrons.

The question says ion has a net charge of 3+ so it means the atom has lost 3 electrons from it.

So ion formed from the atom contains 8 positive protons and 5 negative electrons (Answer)

To find the number of neutrons we make use of the formula  

Please Note: Mass number - atomic number = number of neutrons

The answer is option A "second." The SI unit of time is a second other units of measure consist of mass, metre, temperature, and kilogram. A second is how you measure time because how 60 seconds equal a minute, 60 minutes equal a hour, 24 hours equal a day then so on.

Hope this helps.

Answer:

extensive properties depend on the amount of matter being used. intensive properties do not depend on the present substantive.

Explanation:

The quantity of materials in a sample determines whether a property is referred to as an extensive property. The type of matter in a sample, not the quantity, determines an intense attribute of matter.

Physical properties are defined as the properties of matter that may be seen and measured without affecting the sample's chemical composition. Physical characteristics of substances and systems are frequently referred to as extensive and intensive characteristics.

Mass, weight, and volume are examples of extensive qualities that change depending on the amount of the substance. Contrarily, intensive qualities, such as color, melting point, boiling point, electrical conductivity, and physical state at a specific temperature, are independent of the amount of the substance present.

Thus, the quantity of materials in a sample determines whether a property is referred to as an extensive property. The type of matter in a sample, not the quantity, determines an intense attribute of matter.

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Answer:

The answer is: If mass remains the same while the volume of a substance decreases, the density of the substance will increase.

Explanation:

Let's make an example:

If we have a wood block that's 1 kg, and the volume of the block is 1 cubic meter, that means that we have a wood block with a density of 1 kg/m3. If we now decrease the volume down to 0.2 cubic meters, while the mass stays at 1 kg, we suddenly have a change of density. Why?

If we now try to increase the volume of the wood block, with the mass increased as well, equal to the amount of increased volume, to get to 1 m3, we need to increase the size of the wood block 5 times, meaning the mass increases 5 times. So, we have now a wood block with a volume of 1 cubic meter and 5 kg, which leaves us with a density of 5 kg/m3, which is, again, 5 times higher than we started with.

Explanation:

To convert from moles to molecules we simply multiply the number of moles by Avagadro's number, 6.02 × 10²³.

For example if we have 1 mol of a substance we have 6.02 × 10²³ molecules of that substance.

1 mol × 6.02 × 10²³ = 6.02 × 10²³ molecules.

To convert moles to molecules, multiply the number of moles by Avogadro's number, which is 6.022 x 10²³ molecules/mole.

To convert moles to molecules, you need to use Avogadro's number. Avogadro's number is 6.022 x 10²³, which is the number of molecules (or atoms, ions) in one mole of a substance.

Here are the steps for the conversion:

First, identify the number of moles you want to convert.

Next, multiply the number of moles by Avogadro's number (6.022 x 10²³ molecules/mole).

For example, if you have 2 moles of a substance, the number of molecules is calculated as follows:

Molecules = Moles x Avogadro's number

Molecules = 2 moles x 6.022 x 10²³ molecules/mole

Molecules = 1.2044 x 10²⁴ molecules

So, 2 moles of a substance contain 1.2044 x 10²⁴ molecules.

Answer:

Salt Water

Explanation:

A substance is homogeneous if its composition is identical wherever you sample it - it has uniform composition and properties throughout. Homogeneous is Latin for the same kind. If a substance is not homogeneous, it is said to be heterogeneous.

Answer: Eukaryotic cells are very diverse in shape, form and function. Some internal and external features, however, are common to all. These include a plasma (cell) membrane, a nucleus, mitochondria, internal membrane bound organelles and a cytoskeleton.

Explanation:  Both prokaryotic and eukaryotic cells have structures in common. All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. The plasma membrane, or cell membrane, is the phospholipid layer that surrounds the cell and protects it from the outside environment.

All eukaryotic cells have various common characteristics and structures such as -nucleus and other membrane-bound compartments or organelles that help in giving all of them a specialized function.

A eukaryotic cell is a type of cell that contains the nucleus and other membrane-bound compartments or organelles that help in giving all of them a specialized function.

Thus, All eukaryotic cells have various common characteristics and structures such as - nucleus and other membrane-bound compartments or organelles that help in giving all of them a specialized function.

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Answer:

385 miles

Explanation:

To solve this question using dimensional analysis we first must seperate the speed into a fraction. Then we multiply this by the amount of hours, this will cancel out the hours giving us the speed.

[tex]\frac{55 mi}{1h}[/tex] × 7 h = 385 miles

To find the number of oxygen atoms in a sample of calcium carbonate, calculate the number of moles of calcium carbonate and multiply by the number of oxygen atoms per molecule. The sample contains approximately 29.331 oxygen atoms.

To determine the number of oxygen atoms in a sample of calcium carbonate, we need to know the number of moles of calcium carbonate and the formula of calcium carbonate. The formula for calcium carbonate is CaCO3, which means there is one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O) in each molecule of calcium carbonate.

First, we need to find the volume of the cube. The volume of a cube is given by V = s3, where s is the length of the sides of the cube. In this case, the length of the sides of the cube is 2.805 in. Therefore, the volume is V = 2.8053 = 22.124 in3.

Next, we need to convert the volume from cubic inches to cubic centimeters, as the density is given in g/cm3. Since 1 in3 = 16.3871 cm3, the volume in cm3 is 22.124 in3 * 16.3871 cm3/in3 = 362.274 cm3.

Finally, we can calculate the mass of the sample of calcium carbonate using the density formula: density = mass/volume. Rearranging the formula, mass = density * volume. Plugging in the values, mass = 2.70 g/cm3 * 362.274 cm3 = 978.780 g.

Now, we know the mass of the sample, which is equal to the molar mass of calcium carbonate multiplied by the number of moles. The molar mass of calcium carbonate (CaCO3) is calculated by adding the atomic masses of calcium, carbon, and three oxygen atoms: 40.08 g/mol + 12.01 g/mol + (3 * 16.00 g/mol) = 100.09 g/mol.

Using the equation: mass = molar mass * moles, we can solve for the moles of calcium carbonate in the sample. Rearranging the equation, moles = mass / molar mass. Plugging in the values, moles = 978.780 g / 100.09 g/mol = 9.777 mol.

Since there are three oxygen atoms in each molecule of calcium carbonate, the total number of oxygen atoms in the sample is calculated by multiplying the number of moles of calcium carbonate by the number of oxygen atoms per molecule: 9.777 mol * 3 = 29.331 oxygen atoms.

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Answer:

C. An explanation

Answer: hi

Explanation:

Answer:

B. 33 mm²

Explanation:

The language "product" means that we must multiply the numbers given to get our answer.

5.4 mm × 6.02 mm = 33 mm²

The significant figures rule for multiplication is that we must us the amount of significant figures in the number with the least significant figures, in this question this is 2 significant digits from 5.4 mm.

Answer:

Explanation:

Plutonium is a radioactive element belonging to the actinide series on the peroidic table. It is located on the f-block.

The isotope of plutonium with a neutron number of 144 can be expressed below:

                                      ²³⁸₉₄Pt

238 is the mass number of the isotope

94 is the atomic number

Pt is the symbol of this isotope.

The mass number is the sum of the protons and neutrons in the nucleus of the atom of an element. Here, the number of protons is 94 and it is the same as the number of electrons. Since the given number of neutrons is 144, combining them gives 238 as the value of the mass number.

The atomic number is the number of protons in the atom which is 94.

Answer:

We need a picture of the problem to solve!

Explanation:

Potential energy is greatest at the top of a loop (like a rollercoaster or pendulum), due to height and gravity. Kinetic energy, or the energy of motion, is greatest at the bottom of the loop, due to speed and the downward pull of gravity.

The distinction between where kinetic energy and potential energy are greatest in the loop of, say, a roller coaster or pendulum swing depends on gravity and motion.

At the top of the loop, the potential energy is at its greatest. This energy is stored due to the object's position relative to other objects, height, and gravity. Potential energy is highest when the rollercoaster is at its highest point because gravitational pull is maximized and movement is momentarily paused.

On the other hand, kinetic energy, which is energy in motion, is greatest at the bottom of the loop. This is because all the potential energy has been converted into kinetic energy as the rollercoaster or pendulum descends, speed increases, and pulls downwards by gravity.

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Answer:

False

Explanation:

''A mixture is the chemical bonding of two or more substances in any proportion'' is false statement because a mixture don't include bonding of chemical substances.  

Mixtures in chemistry are including blending of substances and we have two tipes of mixture:

Some of the chemical mixtures are: mixture of water and sand, mixture of sand and iron filings and more...

If we are talking about bonding in chemistry there are Covalent bonds and Ionic bonds.

Answer:

The statement is False.

Explanation:

A mixture contains two or more elements present in it.

The elements are not in chemical combination with each other.

A compound too contains two or more elements but they are in chemical combination.

For example NaCl  is a compound which contains 1 part of Sodium and 1 part of Chlorine.

[tex]H_2 O[/tex] is a compound 2g of hydrogen is chemically combined with 16g of Oxygen.

Chemical bonding is the attractive forces  which holds the atoms together in a molecule.

NaCl - the attractive force is called as Ionic bond.

[tex]H_2 O[/tex] - the bond present is a covalent bond

A mixture has two or more elements but there is no chemical bonding present in it. The components of a mixture can be easily separated from it.

Answer:

The correct answer will be options-

1. Both artists and scientists use their imagination to create things.

2. Both artists and scientists rely on others in their field for inspiration.

3. Both artists and scientists use technological innovations to explore new possibilities.

Explanation:

The artist and scientist share many common features related to their philosophy and exploration.

Both artist and scientist acquire new ideas and talent by the previous work done by experts in their fields. They take inspiration from them to do new work.

An artist creates a new piece of work by imagination like a painter which is also used by the scientist to think new ideas in a scientific investigation like the theory of relativity was based on the logical imagination.

An artist and a scientist use the new technologies to advance their work in their respective fields and thus, the selected options are the correct answer.

Answer:

1.) Both artists and scientists use their imagination to create things.

2.)Both artists and scientists rely on others in their field for inspiration.

4.)Both artists and scientists use technological innovations to explore new possibilities.

Explanation:

Correct on edge 2021

Answer:

Hot air rises

Explanation:

Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.

Answer:

P'(-30, -20), Q'(10, -50), R'(40, 0)

Explanation:

Multiply each coordinate by 5 to get your above answer.

I am joyous to assist you anytime.

The vertices of triangle PQR are dilated by a factor of 5 resulting in new vertices P′(-30,-20), Q′(10,-50), and R′(40,0).

The given task is about a geometric transformation called dilation. In the game of dilation, each point moves closer to or further from the origin (0, 0) based on the scale factor. Here, the given triangle is dilated by a scale factor of 5. So, each coordinate of the triangle would be multiplied by that factor.

Let's calculate:

Therefore, the coordinates of the vertices of triangle P′Q′R′ after dilation will be P′(-30,-20), Q′(10,-50), and R′(40,0).

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Answer:

219.125 kg.

Explanation:

Density: This can be defined as the ratio of mass of a body to the nolume of the body.

The Formula of density is given as,

D = m/v ................... Equation 1

Where D = Density of benzene, m = mass of benzene, v = volume of benzene.

Make m the subject of the equation

m = Dv ................. Equation 2

Given: D = 0.8765 g/mL, v = 250 mL.

Substitute into equation 2

m = 0.8765×250

m = 219.125 kg.

Hence the mass of benzene = 219.125 kg.

The mass of 250.0 mL of benzene is 219.125 grams if the density of benzene is 0.8765 g/mL.

​

Density is a physical property of a substance that describes how much mass is contained in a given volume. It is calculated by dividing the mass of an object or substance by its volume. The formula for density is:

Density = Mass / Volume

The units of density depend on the units of mass and volume used in the calculation. Common units of density include grams per milliliter (g/mL) for liquids and solids, and grams per cubic centimeter (g/cm³) for solids.

Density is often used to characterize and compare the properties of different materials and substances.

Given:

Volume of benzene = 250.0 mL

Density of benzene = 0.8765 g/mL

Mass = 250.0 mL × 0.8765 g/mL

Mass = 219.125 g

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Answer:

Oxygen's atomic weight is 16.00 amu. 1 mole of oxygen is 6.02 x 1023 atoms of oxygen 1 amu = 1.661 x 10-24g What is the molar mass (g/mole) of oxygen? Molar mass (in grams) is always equal to the atomic weight of the atom!

Explanation:

i looked it up ok

Answer:

Mass of sodium + nitrogen +oxygen+ oxygen+ oxygen = =85 g/mol

Explanation:

Molar mass is the mass of 1 mole of the substance and its unit is g/mol

We find the molar mass by just adding atomic mass of the elements present in the chemical formula of the compound

For example  

[tex]H_2 SO_4[/tex]

Atomic mass of H is 1.008 (approximately 1)

Atomic mass of S is 32

Atomic mass of O is 16

There are 2, H atoms 1, S atom and 4, O atoms

So, the molar mass of the compound [tex]H_2 SO_4[/tex] will be

[tex]\\$=[(2 \times 1)+(1 \times 32)+(4 \times 16)]$\\\\$=(2+32+64)=98 \frac{g}{m o l}$[/tex]

The question says 1, Na  

1, N and  

3, O

So the chemical formula we get is [tex]NaNO_3[/tex]

The molar mass of the compound [tex]NaNO_3[/tex] is

[tex]\\$=[(1 \times 23)+(1 \times 14)+(3 \times 16)]$\\\\$=(23+14+48)$[/tex]

=85 g/mol (Answer)

If the data from an investigation do not support the original hypothesis, the correct next step is to revise the hypothesis and perform another experiment. Data is not manipulated to fit the hypothesis; instead, the hypothesis is adapted based on the objective data collected. The goal is to advance knowledge through a reliable scientific process.

When the data from an investigation do not support the original hypothesis, the appropriate next step is to revise the hypothesis and conduct a new experiment. It is essential to understand that manipulating data to fit a hypothesis is not a valid scientific practice. Instead, the hypothesis must be adjusted to reflect the reality of the data collected. This iterative process of hypothesis testing is at the core of the scientific method, which values objectivity and systematic investigation whether in a laboratory setting or through natural observation.

Experiments are tools for gathering objective data to determine whether a hypothesis is supported or refuted. If the data do not support the hypothesis, this does not imply that the data are incorrect. Rather, it may indicate that the hypothesis needs to be revised. The new hypothesis should then be tested with a fresh experiment, furthering our understanding of the phenomenon under study.

Ultimately, the goal is not to force the data to fit preconceived notions but to let the data guide the development of credible scientific theories. This process contributes to the advancement of knowledge in the field and ensures that scientific findings are reliable and can be built upon.

They are located on the right side of the periodic table. Metals are located on the left side of the periodic table.

Hope that helps!!

Answer:

1.115 Kg of HF needed to react with UO₂.

Explanation:

Given data:

Mass of UO₂ = 3.76 Kg   (3.76× 1000 = 3760 g)

Mass of HF = ?

Solution:

First of all we will write the balance chemical equation.

UO₂(g) + 4HF(g) → UF₄ (g) + 2H₂O(l)

Now we will calculate the number of moles of UO₂.

Number of moles = mass / molar mass

Molar mass of UO₂ = 270.03 g/mol

Number of moles = 3760 g / 270.03 g/mol = 13.9244 mol

Now we will compare the moles of HF and UO₂ from balance chemical equation.

                   UO₂    :    HF

                    1         :     4

              13.9244    :    4×13.9244 = 55.7 mol

Mass of HF = number of moles × molar mass

Mass of HF = 55.7 mol × 20.01 g/mol

Mass of HF = 1114.56 g

In kilogram:

1114.56 / 1000 = 1.115 Kg

Answer:

fating on acid and bases will give u the property of paper blue litmus and they tase sour and they typically contain an =oh group with slippery stuff and a propety of acids

Explanation:

Acids are substances that release hydrogen ions in solution, participate in chemical reactions, and are classified by how many protons per molecule they can give up in a reaction. Acid strength varies, with strong acids ionizing completely in solution and weak acids partially ionizing.

An acid is a type of substance with specific properties. First, an acid is a substance that releases hydrogen ions (H*) in solution. This release of ions means that a positively charged hydrogen ion is just a proton and this proton is likely to engage in chemical reactions. Acids are also classified by the number of protons per molecule they can give up in a reaction, with monoprotic acids like HCl containing one ionizable hydrogen atom.

Another property of acids is that their strength varies. Strong acids, like hydrochloric acid, ionize completely and release all their hydrogen ions in the solution, while weaker acids like vinegar or acetic acid do not ionize completely, leaving some of their hydrogen ions still bonded within the compound in the solution. Therefore, the stronger the acid, the more readily it donates its H*.

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