How to find the mass number of an atom with 45 neutrons and 35 electrons?

Answers

Answer 1

Mass number = protons + neutrons
protons = electrons
so 35 electrons = 35 protons

So 35 protons + 45 neutrons =
80

The element is Bromine with the symbol: Br

Answer 2

Final answer:

The atom with 45 neutrons and 35 electrons (and therefore 35 protons) has a mass number of 80, which is obtained by adding the number of protons and neutrons.

Explanation:

To determine the mass number of an atom with 45 neutrons and 35 electrons, it's important to remember that an atom, in its electrically neutral state, has an equal number of protons and electrons. In this scenario, the atom has 35 protons because it has 35 electrons.

The mass number of an atom is calculated by adding the number of protons and neutrons together. So, for this specific atom, the mass number is calculated as 35 (protons) + 45 (neutrons), which totals 80. This mass number signifies the sum of particles in the atom's nucleus, which plays a fundamental role in defining its chemical properties and behavior.

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Related Questions

How many protons and electrons are in the atom of sodium whose atomic number is 11?

Answers

Sodium has 11 protons and and 11 electrons.

Hope this helps

The following diagram shows a common way that scientific knowledge is discovered.

mc024-1.jpg

Which term should replace the question mark?
hypotheses
theories
laws
publications

Answers

The common way the scientific knowledge is discovered passes through several steps:
First you observe the phenomenon around you. Then you develop a certain hypothesis based on your observation. After that you start testing your hypothesis and collecting the resultant data from your tests.
Finally comes the conclusion of whether your hypothesis is accepted or rejected.
If it is accepted, it can further develop into a theory and a publication afterwards.

The answer is: hypothesis

The answer to this question should be a hypothesis.

You can simply make hypothesis from observation, but you can make theories or laws just like that. Theories need data, thus it should be placed below experiments and result.

what are the most common student injuries in the chemistry lab and how can they be prevented

Answers

The most common injuries in a chemistry lab is making a fire, heat burns, chemical burns, cuts and scrapes, contamination, inhalation, and spills and breaks.

1.) You can prevent making a fire by making sure you close and seal flammable materials.
2.) You can prevent heat burns by teaching the students how to properly use tongs,water baths, and other cooling equipment.
3.) You can prevent chemical burns by treating the chemicals with caution, measure carefully, and use the approved containers.
4.) You can prevent cuts and scrapes by telling the students how to use the blades safely, and also when they are disposing broken or sharp items they should know how to wrap them up so no one else will get hurt.
5.) You can prevent contamination by washing your hands, protect their clothing and skin with a lab coat or a lab apron, gloves and glasses, and cleaning your area where the germs of the chemicals were so no one will become.
6.) You can prevent inhalation by opening up windows, using ventilation fans, and using an equipment that measures the amount of gas emission in a room.
7.) Finally, you can prevent spills and breaks by telling the students what will happen if anything spills, and tell them to clean up.

How do the general methods for separating mixtures and compounds differ?

Answers

There are several ways as to which the components of the mixtures and compounds are separated from one another. First, mixtures can be physically separated. These processes of separation include sifting, filtration, centrifugation, etc.

However, separation of the components of the compounds are rather more complicated as this involves chemical reaction and other heat intensive processes.

You’ll soon make two pieces of ice with the approximate shapes shown in the image. Both pieces of ice have the same mass and volume. How are the two shapes different from one another?

Answers

Is there an image? I'll stay to help you.

What is the formula for the compound methane? express your answer as a chemical formula?

Answers

The chemical formula for methane is CH4. with 4 being a subscript of H which is Hydrogen.

The chemical formula of methane is CH₄.

This means that a single molecule of methane consists of one carbon atom (C) and four hydrogen atoms (H). It is the simplest alkane and a major component of natural gas. Methane's structure can also be represented by a Lewis structure where the carbon atom forms covalent bonds with four hydrogen atoms.

This configuration allows methane to follow the octet rule, ensuring that the carbon atom has eight electrons in its valence shell, while each hydrogen atom follows the duet rule, having two valence electrons.The chemical formula of methane is CH₄, indicating one carbon atom bonded to four hydrogen atoms. The relative abundance of methane makes it a significant fuel source.

How many valence electrons does copper have?

Answers

Copper has 2 valence electrons.

Hope this helps

Which reagent is the limiting reactant when 0.550 mol Al(OH)3 and 0.550 mol H2SO4 are allowed to react?

Answers

H2SO4 The balanced reaction between Al(OH)3 and H2SO4 is 3 H2SO4 + 2Al(OH)3 ==> Al2(SO4)3 + 6 H2O So that indicates that you need 3 H2SO4 molecules for every 2 Al(OH)3 molecules. So you need more H2SO4 than you need Al(OH)3. Since you have the same number of moles of each reactant, that means that the limiting reactant is H2SO4

Find the atomic numbers of the as yet undiscovered next two members of the series. radon

Answers

This answer is based on the electron configuration.

And you can use Aufbau's rule to predict the atomic number of the next elements.

Radon, Rn is the element number 86.

Following Aufbau's rules, the electron configuration of Rn is: [Xe] 6s2 4f14 5d10 6p6. This means that you are suming 2 + 14 + 10 + 6 = 32 electrons with respect to the element Xe.

You can verity that the atomic number of Xe is 54, so when you add 32 you get 54 + 32 = 86, which is the atomic number of Rn.

Again, as per Aufbau's rules, the next element of the same group or period is when the 6 electrons of the 7p orbital are filled. For that, they have to pass 32 elements whose orbitals are:

7s2 5f14 6d10 7p6: count the electrons added: 2 + 14 + 10 + 6 = 32, and that is why the next element wil have atomic number 86 + 32 = 118.

Now, when you go for a new series, you find a new type of orbital, the g orbital, for which the model predict there are 18 electrons to fill.

So the next element of the group will have ; 2 + 18 + 14 + 10 + 6 = 50 electrons, which means that the atomic number of this, not yet discovered element, has atomic number 118 + 50 = 168.

By the way the element with atomic number 118 was already discovdered at its symbol is Og. You can search that information in internet.

Answers: 118 and 168

The atomic numbers of the as yet undiscovered next two members of the series are 118 and 168.

Further explanation

The noble gases is a group of chemical elements with similar properties such as under standard conditions they are all odorless, colorless, monatomic gases with very low chemical reactivity.

The heaviest known noble gas metal is radon, atomic number 86. Where The outermost shell configuration of radon is [tex]6s^2 6p^6[/tex]

Electronic configuration of the next noble gas is:

[tex][Rn]5f^14 6d^{10} 7s^2 7p^6[/tex]

Therefore, atomic number of the noble gas after Rn is 86+32 = 118

The atomic number is the number of protons found in the nucleus of every atom of that element.

Electronic configuration of still the next noble gas can be obtained by adding [tex]5g^18 6f^{14} 7d^{10} 8s^2 8p^6[/tex], which means 50 more electrons.

So the atomic number = 118 + 50 = 168

Therefore the atomic numbers of the as yet undiscovered next two members of the series are 118 and 168.

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Answer details

Grade: 9

Subject: Chemistry

Chapter: the atomic numbers

Keywords: the atomic numbers, radon, Electronic configuration, electrons, the noble gas

If a room requires 12.3 square yards of carpeting, what is the area of the floor in units of ft2? (3 ft = 1 yd)

Answers

The problem above is simply a conversion problem. We are asked to convert from units of square yards to units od square feet. To do this, we need a conversion factor which would relate the different units involved. We either multiply or divide this certain value to the original measurement depending on what is asked. From the problem statement, 3 ft is equal to 1 yard, we use this.

12.3 square yards ( 3 ft / 1 yd )^2 = 110.7 square feet

Final answer:

To convert 12.3 square yards of carpeting to square feet, multiply by 9, as there are 9 square feet per square yard, resulting in an area of 110.7 ft².

Explanation:

To calculate the area of the floor in square feet (ft²) given that the area is 12.3 square yards, we need to use the conversion between yards and feet. One square yard is equal to nine square feet, as 1 yard is equivalent to 3 feet and this conversion applies in both dimensions of area. Hence, to convert square yards to square feet, you multiply the square yards by the square feet equivalent of one square yard:

12.3 yd² × (9 ft²/1 yd²) = 12.3 × 9 ft²

The area of the carpeting required in square feet is therefore:

12.3 × 9 = 110.7 ft²

Which element could provide one atom to make an ionic bond with fluorine? (Hydrogen will not make ionic bonds easily, so do not use this element).

Answers

Any element from group 1 of the Periodic Table.

If the atomic number of potassium is 19, how many protons occur in the nucleus of a potassium atom?

Answers

19 protons because the number of protons are the same as the atomic number which is 19.

Hope this helps

Final answer:

Potassium has an atomic number of 19, which means there are 19 protons in the nucleus of a potassium atom.

Explanation:

The atomic number of an element, such as potassium, is defined as the number of protons in the nucleus of an atom of that element. Since potassium has an atomic number of 19, there are 19 protons in the nucleus of a potassium atom. Additionally, this atomic number also means that a neutral atom of potassium would have 19 electrons. The electron configuration code for potassium, reflecting the arrangement of these 19 electrons in different shells or energy levels, can also be determined based on its atomic number.

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.

Answers

From reference or science books, we can actually know that the elementary charge of phosphorus is -3. Since it is negative, this means that it has an excess of electrons, which further means that it takes up 3 electrons to become an ion. Therefore the equation can be written as:

P + 3e ---> P3-

Answer: [tex]P+3e^-\rightarrow P^{3-}[/tex]

Explanation: Phosphorous atom is the element with atomic number 15 and thus contains 15 electrons.

[tex]P:15:1s^22s^22p^63s^23p^3[/tex]

Thus it is short of 3 electrons to attain stable noble gas configuration. Thus it gains three electrons and converts to phosphide ion [tex](P^{3-})[/tex] with 18 electrons.

[tex]P^{3-}:18:1s^22s^22p^63s^23p^6[/tex]

When an atom combines chemically with another atom it either gains loses or shares?

Answers

When an atom combines chemically with another atom, it either gains, loses, or shares ELECTRONS.

Butane, ch3-ch2-ch2-ch3, is a hydrocarbon fuel used in lighters. how many moles of molecules are there in a 350. gram sample of butane

Answers

6.03 moles.

1 molecule of butane contains 4 carbon atoms and ten hydrogen atoms.

The molar mass is 4 times the atomic mass of carbon, 12 g/mol, plus 10 times the atomic weight of hydrogen, 1 g/mol.

Molar mass = 4 * 12 g/mol + 10 * 1 g/mol = 58 g/mol.

This means that 1 mole of butane has a mass of 58 g.

To figure out how many moles are in a sample of butane, divide the mass of sample in grams by 58 grams

Number of moles in sample = 350 g / 58 g/mol = 6.03 moles.

When cream mixes with coffee, is this a chemical or physical change?

Answers

It is a physical change when cream mixes with coffee, it changes the color of the coffee. When you add more or less cream there is a color change depending on the consistency of cream. The properties are not changes and a no new compound is formed as in chemical change with a reaction of two compounds, a new compound is formed with different properties. So it is a physical change.

How many protons, neutrons, and electrons are in a neutral atom with the symbol 41Ca

Answers

The 41 beside the chemical symbol of calcium signifies the mass number of the isotope which would be 41. It would be equal to the sum of the number of protons and neutrons in the atom. the number of proton is equal to every isotope calcium has which is 20. therefore the number of neutrons would be 21. since it is being states the atom is neutral, the number of electrons would be equal to protons which is 20.

Final answer:

The neutral 41Ca atom has 20 protons, 21 neutrons, and 20 electrons. The atomic number of Calcium is 20 which represents the number of protons and also the electrons in the neutral atom. To determine the number of neutrons, we subtract the number of protons from the total mass number, getting 21 neutrons.

Explanation:

The symbol 41Ca for Calcium represents an isotope of Calcium. The number before the symbol, 41, is the mass number, which is the sum of protons and neutrons. The atomic number of Calcium (Ca), which represents the number of protons is 20 (from the periodic table). This doesn't change irrespective of the isotope. As it is a neutral atom, the number of electrons is equal to the number of protons, again 20.

To calculate the number of neutrons in this isotope, we subtract the number of protons from the mass number. So the number of neutrons = 41 - 20 = 21 neutrons.

In conclusion, the neutral 41Ca atom has 20 protons, 21 neutrons, and 20 electrons.

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Calculate the density of a material that has mass of 52.457g and a volume of 13.5 cm3

Answers

1 cm3 = 1 ml
Density is g/ml

So this is 52.457g / 13.5ml = 3.89 g/ml

The diameter of a human red blood cell is 0.000006m write this number using scientific notation a10b

Answers

To convert the expanded form into exponent form or what is commonly known as scientific notation, you have to move the decimal place until you reach the last digit. From its original place, there are 6 places in order to reach to the last digit. Since you moved to the right, the exponent would have a positive sign. The scientific notation would be 6×10⁶ m.

Scientists can find new discoveries that change their current understanding of scientific knowledge.

True or False?

Answers

The correct answer is True, it happens all of the time.

yea the answer is true

Adding energy or increasing the speed of the particles at very low pressure in a solid would cause
A) boiling.
B) condensation.
C) melting.
Eliminate
D) sublimation.

Answers

the answer is c, bc we are talking about a solid and adding more energy to a solid makes it melt.

Answer:

D) sublimation.

Explanation:

took the test

Sublimation is the transition of a solid directly to gas. it can be seen as temperature moves to the right at very very low pressures.

An automobile can travel 40.0 miles on one gallon of gasoline how many kilometers per liter is this

Answers

Sent a pic of your problem and worked it out.

Answer: 17.04 km/L

Explanation:

Given: An automobile can travel 40.0 miles on one gallon of gasoline

That is 40 miles/ gallon

Now using the conversion factor :

1 mile = 1.61 km

Thus 40 miles =[tex]\frac{1.61}{1}\times 40=64.4km[/tex]

Alsousing the conversion factor

1 gallon = 3.78 L

Thus [tex]40miles/gallon[/tex] will be [tex]\frac{64.4km}{3.78L}=17.04km/L[/tex]

Thus the answer is 17.04 km/L.

In the "methode champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. the reaction is given below. c6h12o6(aq) 2 c2h5oh(aq) + 2 co2(g) fermentation of 724 ml grape juice (density = 1.0 g/cm3) is allowed to take place in a bottle with a total volume of 825 ml until 12% by volume is ethanol (c2h5oh). assuming that the co2 is insoluble in h2o (actually, a wrong assumption), what would be the pressure of co2 inside the wine bottle at 29°c? (the density of ethanol is 0.79 g/cm3.)

Answers

Final answer:

To calculate the pressure of CO2 in the wine bottle, you can use the ideal gas law equation PV = nRT. Convert the volume of ethanol produced to the volume of CO2 using stoichiometry. Take into account that the assumption that CO2 is insoluble in H2O is incorrect.

Explanation:

The pressure of CO2 inside the wine bottle can be calculated using the ideal gas law 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. To calculate the number of moles of CO2 produced, you need to convert the volume of ethanol produced to the volume of CO2 using stoichiometry. Finally, you can calculate the pressure of CO2 using the equation.

The density of ethanol is given as 0.79 g/cm3, so you can convert the volume of ethanol to its mass. The volume of CO2 produced is twice the volume of ethanol produced. From the information given, you can calculate the number of moles of CO2 produced. Then, you can convert the temperature in Celsius to Kelvin and use the ideal gas law equation to calculate the pressure of CO2 inside the wine bottle at 29°C.

Remember that the assumption made in the question that CO2 is insoluble in H2O is incorrect. In reality, it dissolves to some extent in water, which affects the pressure calculation.

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how does the government provide support to the people of the HIV and AIDS awareness campaign

Answers

By providing the drugs necessary to those without insurance

Answer:

AIDS is acquired immuno deficiency syndrome caused by the HIV (human immunodeficiency virus). The government has raised the following awareness campaign on AIDS:

Government provides proper health care to the individual suffering from AIDS.

The government raises the awareness and the importance of the HIV test.

The government provides drugs to the people that are effective against the HIV.

_____ bonds share electron pairs. Ionic Metallic Hydrogen Covalent

Answers

Covalent bonds- are bonds that share electron pairs between atoms.

Ionic bonds are bonds that are made after one atom GIVES AWAY one or more electrons to the other atom.

Hydrogen Bonds- bonds between hydrogen(H) and usually O,N, or F. Hydrogen bonds are NOT TRUELY BONDS they are an ELECTROMAGNETIC ATTRACTIONS. These bonds can be Intramolecular(bonds within a molecule) or Intermolecular bonds (between two separate molecules). Individually a hydrogen bond is weak. However, hydrogen bonds can be strong in large numbers.

Metallic Bonding- occurs when metals bond with other metals their valence electrons become "delocalized," or free to move around. This delocalization forms something called the electron sea. In the electron sea, valence electrons DO NOT BELONG TO ANYONE ATOM.

Therefore, the answer is Covalent bonds.
Hope this helped! :)

Answer:

Covalent Bonds

Explanation:

Got it right on Odessyware ;) Have a nice day!!!

Which of the following correctly describes the role of scientific models in the advancement of technology?
a. Models represent the basic facts.
b. Models are educated guesses that can be tested.
c. Models help us better understand the phenomena. <---?
d. Models answer specific questions about phenomena.

Answers

Hello There!

Based on the information i'd say it's C too.
Models are representations of ideas and are used to explain a phenomena sometimes.

Hope This Helps You!
Good Luck :)

Which substance can not be broken down by a chemical change?
a.ammonia
b.methanol
c.propane
d.phosphorus?

Answers

The substance that can not be broken down by a chemical change are phosphorus.

Naturally occurring copper is 69.15% copper-63 (atomic mass = 62.93 amu) and 30.85% of some other isotopic form of copper. what must the atomic mass of this second isotope be in order to account for the 63.55 amu average atomic mass of copper? (write the answer to two decimal places.)

Answers

64.94 First, write out an expression about what we know 0.6915 * 62.93 + 0.3085 * x = 63.55 Now solve for x 0.6915 * 62.93 + 0.3085 * x = 63.55 43.5161 + 0.3085 * x = 63.55 0.3085 * x = 20.03391 x = 64.93972 Rounding the answer to 2 decimal places gives x = 64.94

Discuss why the formation of membranes helped in the development of more complex life forms.

Answers

Membranes provided significant advantages for the survival of organisms and the replication of their genetic material.

One significant advantage was the ability to better regulate and insulate the cells internal environment from the external environment. The cell had better control over the chemical composition and temperature inside its membrane, which made it easier to survive.

Cells with membranes were able to contain their genetic material, ensuring that, when replicated, it was identical to the parent cell. This meant that organisms with better survivability traits passed on their genetic material in a way that better preserved their genes, and by extension these advantageous traits.

These advantages helped cells with membranes to better survive and replicate, and also enabled the more complex cells with advantageous genetic material to better preserve and copy that material to new cells, allowing for a higher probability of reproduction among more complex life forms.

. Divide 94.20 g by 3.167 22 mL.

Answers

94.20 g/3.16722 mL = 29.74 g/mL

The ratio of mass to volume is equal to the substance's density. Thus, 29.74 g/mL is the density of whatever substance it may be. Density does not change for incompressible matter like solid and some liquids. Although, it may be temperature dependent.

Answer : The answer will be 29.74 g/mL

Explanation :

As we are given an expression :

Divide 94.20 g by 3.16722 mL.

To solve this problem, we use division operation. So,

[tex]\frac{94.20g}{3.16722mL}[/tex]

By solving the term, we get:

[tex]\Rightarrow 29.74g/mL[/tex]

According to the significant rule of division, the least number of significant figures in any number of the problem determines the number of significant figures in the answer.

In the given expression, 94.20 has 4 significant figures and 3.16722 has 6 significant figures. From this we conclude that 4 is the least significant figures in this problem. So, the answer should be in 4 significant figures.

Thus, the answer will be 29.74 g/mL

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