If Beryllium has a mass number of 7 and atomic number of 4, how many protons does it have?

Answer:

1-T

2-F

3-T

4-T

Explanation:

big brain

*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆

Answer: 1513.15789 Pennies

Explanation:

2300 / 1.52 = 1513.15789

I hope this helped!

<!> Brainliest is appreciated! <!>

- Zack Slocum

*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆

The student added sodium chloride in order to precipitate lead II chloride because this is a positive test for lead II ions.

Some times when we carry out an aqueous phase reaction, the products of the reaction would be found to be in the solid phase. This implies that one of the products of the reaction is insoluble in water and separates out of the solution.

In this case, the student knows that lead II chloride is insoluble in water thus it is obtained upon the addition of sodium chloride. This informed the addition of the sodium chloride solution.

Learn more about precipitates:https://brainly.com/question/16950193?

#SPJ1

Missing parts;

A 50.0 mL unknown aqueous sample was tested in the laboratory. The unknown sample was identified

to be lead (II) ions by a precipitation reaction with sodium iodide. Since the unknown was identified to

have lead (II) ions in it, a student added excess sodium chloride (NaCl) to the 50.0 mL sample. A white

precipitate was made and was subsequently filtered, washed, and dried to completion. The precipitate

was measure to have a mass of 2.350 grams.

(a) How did the students determine through the addition of sodium iodide that the sample had lead (II)

ions in it?

Answer:

hey! i hope you'll find this helpful, can i have brainliest please? thank you!

When an iron nail is repeatedly rubbed against a permanent magnet in the same direction, it can become temporarily magnetized. This phenomenon is known as magnetic induction.

Iron is a ferromagnetic material, which means it has the ability to be easily magnetized. When the nail is rubbed against the magnet, the magnetic domains within the iron align in a particular direction due to the influence of the magnetic field produced by the magnet. The repeated rubbing in the same direction helps align the magnetic domains more consistently.

The magnetic domains are small regions within the iron where groups of atoms have their magnetic moments aligned. In an unmagnetized iron nail, these domains are randomly oriented, resulting in a net magnetic field of zero. However, when the iron nail is rubbed with a magnet, the magnetic domains align in a common direction, creating a temporary magnetic field within the nail.

The alignment of the magnetic domains persists even after the rubbing stops, causing the iron nail to exhibit magnetism. However, this magnetism is relatively weak and temporary, as the domains can easily revert to their original random orientation. It means that the iron nail loses its magnetic properties over time unless it is exposed to a stronger external magnetic field or is made into a permanent magnet through a different process.

In summary, rubbing an iron nail against a permanent magnet in the same direction aligns the magnetic domains within the iron, resulting in temporary magnetization.

:D

<FIRST ANSWER>  

The answer is A; tundra is at a higher latitude than a desert

Explanation:

Both a tundra and a desert are very dry, so that eliminates B and C.

And as for D, Tundra receives more rain than a desert does, so that eliminates D.

A compound contains only c, h and cl. combustion of 35.0 g of the compound produces 44.7 g co2 and 11.0 g h2o then the empirical formula for this compound is C2Cl3.

What does Compund means?

A compound is a substance composed of two or more distinct elements that have been chemically combined in a predetermined ratio. Organic and inorganic compounds are the two types of compounds. Organic compounds are those that contain carbon and hydrogen, whereas inorganic compounds do not contain carbon and hydrogen. Proteins, fats, carbohydrates, and nucleic acids are examples of organic compounds. Water, salts, and acids are examples of inorganic compounds.

What is an Hydrogen?

An atom of hydrogen is a chemical element with the symbol H and the atomic number 1. It is the most abundant and lightest element in the universe, accounting for roughly 75% of the total mass. Hydrogen is a highly reactive element that can form bonds with other elements to form a variety of compounds, the most important of which is water.

To know more about Compund,

https://brainly.com/question/26487468

#SPJ4

Answer:

a one rotation of the planet on its axis

Explanation:

The two types of motion that planets undergo are;

1) rotation of the planet about its axis

2) revolution of the planet around the sun.

In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.

It takes the earth 1 earth day (24 hours) to complete rotation on its axis.

Ah yes.

The atomic radius is basically the distance between the nucleus of the atom and the outermost electron in the farthest orbital of the atom. The more bigger the atomic radius , the less powerful is the force that holds together the nucleus and its electrons.

Answer:

a) Barney wants to repeat the rutheford experiment

b) the element will be in row 8 column 1 being an alkali metal

c) it should be a radioactive element, with a lot of mass

Explanation:

n this exercise they indicate that the particle Gz has atomic number 119 and atomic mass 305 amu, when reviewing the element periodicity table with this atomic number it has not yet been discovered, it should be in row 8 column 1 therefore it should be an alkali metal .

Therefore, it has only one electron in its last orbit.

a) Barney wants to repeat the rutheford experiment

b) the element will be in row 8 column 1 being an alkali metal

c) it should be a radioactive element, with a lot of mass

As there are multiple factors at play. To start, we can use the formula for distance fallen due to gravity:

d = 1/2 * g * t^2

Where d is distance, g is acceleration due to gravity (9.8 m/s^2), and t is time. If we plug in the given time of 4 seconds, we get:

d = 1/2 * 9.8 m/s^2 * (4 s)^2 = 78.4 meters

So after 4 seconds, the ball has fallen 78.4 meters.

Next, we can use the formula for velocity due to gravity:

v = g * t

Plugging in the values we have, we get:

v = 9.8 m/s^2 * 4 s = 39.2 m/s

So after 4 seconds, the ball is traveling at a velocity of 39.2 m/s.

If there were air resistance, however, this speed would be affected. Air resistance would slow the ball down, making it travel at a slower velocity than it would without air resistance. The amount of air resistance would depend on factors such as the size and shape of the ball, as well as the density of the air around it. In general, the higher the density of the air and the larger and more irregular the shape of the ball, the more air resistance there would be. This is why objects like feathers or pieces of paper fall more slowly than objects like rocks or metal balls - their irregular shapes and low densities make them more affected by air resistance.

To know more about gravity visit:-

https://brainly.com/question/31321801

#SPJ11

Answer: Na2C2O4 probably sodium oxalate

Explanation: assume you have 100 g substance.

Mass of Na is m(Na) = 34.31 g, m(C) = 17.93 g and m(O) = 47.76 g.

Calculate moles n(Na) = 34.31 g/22.99 g/mol= 1.49 mol.

For C n(C) = 1.49 mol and n(O) = 2.985. You divide all by 1.49 you

Get n(Na) : n(C) : n(O) = 1:1:2 M(NaCO2) = 67 g/mol.

Divide 134:67 = 2. You get formula Na2C2O4

In the case of the ionization of acetic acid, which can be represented as CH3COOH ⇌ CH3COO- + H+, the given equilibrium constant of 0.00002 tells us important information about the system.

Since the equilibrium constant is very small (less than 1), it indicates that the forward reaction (ionization of acetic acid) is not favored. In other words, the concentration of the products (CH3COO- and H+) at equilibrium is much lower compared to the concentration of the reactant (CH3COOH). This suggests that the majority of the acetic acid remains unionized.

Moreover, the small equilibrium constant suggests that the reverse reaction (recombination of CH3COO- and H+ to form CH3COOH) is favored. This means that any CH3COO- and H+ ions produced tend to recombine to form acetic acid, rather than remaining as dissociated ions.

Overall, the low equilibrium constant of 0.00002 indicates that the ionization of acetic acid is limited, and the majority of the acetic acid remains as unionized molecules in the system.

Learn more about ionization here

https://brainly.com/question/1602374

#SPJ11

Nuclear magnetic resonance spectroscopy (NMR) is used to study the electronic environment of atoms and the bonding nature of a compound.

The number of different signals observed in the 1H NMR spectra of the given compounds are as follows: Compound A: 10 signals, Compound B: 6 signals ,Compound C: 4 signals Compound D: 6 signals ,Compound E: 9 signals, Compound F: 3 signals

In proton nuclear magnetic resonance spectroscopy (1H NMR), the magnetic field strength and electronic environment of the protons influence the chemical shifts. The shielding effect or deshielding effect of the nearby atoms, bond length, and bond angle, among other factors, all influence the chemical shifts. There are five different types of proton environments, which correspond to five different chemical shifts, in this case: Type 1: Hydrogen atoms that are covalently bonded to sp3 hybridized carbons. Type 2: Hydrogen atoms that are covalently bonded to sp2 hybridized carbons. Type 3: Hydrogen atoms that are covalently bonded to sp hybridized carbons. Type 4: Hydrogen atoms that are covalently bonded to aromatic carbons. Type 5: Hydrogen atoms that are directly bonded to electronegative elements such as nitrogen, oxygen, or halogens.

Here, to determine the number of signals expected in the 1H NMR of the compounds. Compound A: 10 different proton environments => 10 signals. Compound B: 6 different proton environments => 6 signals. Compound C: 4 different proton environments => 4 signals. Compound D: 6 different proton environments => 6 signals. Compound E: 9 different proton environments => 9 signals. Compound F: 3 different proton environments => 3 signals.

Let's learn more about NMR:

https://brainly.com/question/17564948

#SPJ11

Answer:

Human exhale

Explanation:

When humans exhale-carbon is that which all humans produce=18% of all carbon output

7.5 × 10²³ formula units of magnesium hydroxide have a mass of 70. g, when considering Avogadro's number and its molar mass.

It represents the number of particles in 1 mole of particles.

The conversion factor is Avogadro's number.

7.5 × 10²³ formula units × (1 mol/6.02 × 10²³ formula units) = 1.2 mol

The conversion factor is the molar mass of Mg(OH)₂.

1.2 mol × 58.32 g/mol = 70. g

7.5 × 10²³ formula units of magnesium hydroxide have a mass of 70. g, when considering Avogadro's number and its molar mass.

Learn more about Avogadro's number here: https://brainly.com/question/8946174

#SPJ1

Answer:

there it is fella tried on ma own consciousness

To estimate the deltaH for the reaction we can do it from the bond energies, that is, starting from the energy needed to form or break a bond.

The reaction energy will be equal to the binding energy of the reactants minus the binding energy of the products. To calculate each bond energy we must first identify which bonds are involved in the reaction. They give us a balanced reaction:

For the reaction, we have the following bonds

Now we are going to calculate the energy taking into account the values that we can find in tables of the bond energy.

Bond Ee (kJ/mol)

H - H 436

O=O 499

O - H 460

Therefore the energy on each side of the reaction will be:

The reaction energy will be:

We have an exothermic reaction since the result is negative. This means that the energy of the products is greater than that of the reactants.

Now we will convert the energy units to kcal:

ΔH (kcal/mol) estimated of the reaction will be -112kcal/mol

Answer:

B

Explanation:

The warmer the water, the more space it takes up, and the lower its density.

Answer:

The density decreases

Explanation:

The colder the water the closer the particles move together making it denser. The hotter the water the more the particles slow down and move away from each other making the water less dense.

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

To know more about moles and molecules,

https://brainly.com/question/29367909

Answer:

A, D, E

Explanation:

Answer:

Made of cells

Explanation:

cells are the basic building blocks of life

Using the given mass of the compound (0.520 g) and the calculated moles, we can determine the molar mass of the compound.

To find the molar mass of the compound, we can use the formula:

ΔT = Kf * m

where ΔT is the freezing point depression, Kf is the cryoscopic constant (in this case, 3.90 °C/m), and m is the molality of the solution.

First, we need to calculate the molality (m) of the solution:

m = moles of solute / mass of solvent (in kg)

The mass of the solvent (lauric acid) is given as 4.62 g. Since the unknown compound is a solute, we need to convert its mass to moles:

moles = mass / molar mass

Given that the mass of the unknown compound is 0.520 g, we can now calculate the moles of the compound.

Next, we convert the mass of the solvent to kg by dividing by 1000:

mass of solvent (lauric acid) = 4.62 g / 1000 = 0.00462 kg

Now we can calculate the molality:

m = moles of solute / mass of solvent = (moles of the compound) / (mass of solvent)

Finally, we can use the freezing point depression formula to find the molar mass of the compound:

ΔT = Kf * m

Substituting the given values:

4.20 °C = 3.90 °C/m * m

Now solve for m:

m = (4.20 °C) / (3.90 °C/m)

Once we have the molality, we can calculate the moles of the compound:

moles = molality * mass of solvent (in kg)

Finally, we calculate the molar mass:

molar mass = mass of solute / moles of solute

Learn more about molar mass here :-

https://brainly.com/question/31545539

#SPJ11

Claim: The genotype of the mother (Lily) is Bb, and the genotype of the father is BB.

Evidence:

1. Two of Lily's children have blonde hair, which is a recessive trait. This indicates that Lily carries the recessive allele for blonde hair (b).

2. Dark hair is the dominant trait, and Lily's husband is the biological father of all three children. Therefore, the father must carry at least one dominant allele (B) for dark hair.

3. All of Lily's children share the same father, so the father must have passed on the dominant allele for dark hair to each child.

4. Since Lily and her husband have three children, and two of them have blonde hair (recessive phenotype), it is likely that Lily is heterozygous for the hair color gene (Bb), while her husband is homozygous dominant (BB).

Reasoning:

Inherited traits are determined by alleles, or alternative forms of a gene. In this case, the gene for hair color has two alleles: B (dominant for dark hair) and b (recessive for blonde hair). The presence of blonde-haired children indicates that Lily carries the recessive allele (b) for hair color, as blonde hair is a recessive trait. Since all of Lily's children share the same father and two of them have blonde hair, it suggests that the father must have passed on the dominant allele (B) for dark hair to each child. This indicates that Lily's husband is homozygous dominant (BB) for the hair color gene. Therefore, the genotype of Lily is Bb, and the genotype of her husband is BB.

For more questions on genotype
https://brainly.com/question/16616523
#SPJ8

Answer:

4.22

Explanation:

pH stands for potential hydrogen. The letter “p” denotes potential and the letter “H” denotes hydrogen.

pH helps to find the acidity or alkalinity of an aqueous solution.

The number of hydrogen ions (protons) present in a solution is determined by the pH scale.

A pH greater than 7 makes the water more alkaline and a pH less than 7 makes the water more acidic.

\(pH=-\log [H^+]=-\log [0.00006]=4.22\)

The average speed is zero if our frame of reference is the rotation of the Earth because the relative distance with respect to the earth is zero.

Average speed = 0.26 km/hr

total time = 316 minutes

distance = speed * time

                = 8.3 * 5*1/30 = 8.3 *1/6

                = 1.38 km

Average speed = total distance / total time

                             1.38 km / 5.27

                             = 0.26 km/hr

Distance is described to be the importance or length of displacement among positions. observe that the gap between two positions is not the same as the distance traveled between them. Distance traveled is the whole period of the path traveled among positions. Distance traveled isn't a vector.

There are three foremost styles of average: imply, median, and mode. each of these strategies works barely otherwise and frequently results in slightly distinct ordinary values. The suggest is the maximum usually used commonly. To get the mean cost, you add up all of the values and divide this general by means of the variety of values.

Learn more about average speed here:-https://brainly.com/question/4931057

#SPJ4

At a pressure of 5.0 atm, IS 200 L of gas would need to be stored in the volume tank (V2).

To learn more about volume, refer to:

https://brainly.com/question/27100414

#SPJ1

Answer: Tendons.

Explanation: A tendon is a fibrous connective tissue which attaches muscle to bone.

An atom Y has atomic number 13, so the no. of electrons and protons in it is 13 and after loses it will form cation and no. of electrons will become 10.

Atomic number of an atom is equal to the number of electrons or protons present in that atom.

Number of protons and electrons in the atom before loses electron is 13, as given atomic number is 13.

Number of elctrons in the atom is 10 and number of protons is 13, as protons are present in the nucleus.

So, number of protons is always same i.e. 13 within the atom and no. of electrons after losing 3 electrons is 10.

To know more about atomic number, visit the below link:
https://brainly.com/question/1805828

Answer:

i dont know

Explanation:

Answer:

Silicon conducts electricity as well as copper does.

Explanation:

you didn't gave any statements to choose the answer from.

but otherwise, what all I my knowledge says that Silicon conducts electricity as well as copper does.