Which of the following describes a particle that contains
36 electrons, 49 neutrons, and 38 protons?
an ion with a charge of 2-
an ion with a charge of 2+
an atom with a mass of 38 amu
an atom with a mass of 49 amu
Od

Answer:

1068.8 g of N₂ are required.

We can also say, 1.07 kg of N₂

Explanation:

Let's apply the Ideal Gas Law equation to solve the problem:

Formula is  P . V = n . R . T

At STP we know, that P is 1 atm and T is 273.15 K. So let's replace the formula:

1 atm . 855 L = n . 0.082 L.atm /mol.K . 273.15 K

(1atm . 855L) / (0.082 L.atm /mol.K . 273.15 K) = n

38.17 moles = n

Let's convert the moles to mass, nitrogen is a dyatomic gas → N₂

Molar mass N₂ = 28 g/mol

38.17 mol . 28 g/mol = 1068.8 g of N₂ are required.

AT STP the 1 moles of gas is equal to the 22.4 L of gas. The mass of the nitrogen gas in the 855 L tank at STP is 1068 g.

The mass of the Nitrogen gas can be calculate using the formula,

[tex]\bold {w = n \times m}\\[/tex]

Where,

w -mass = ?

n - number of moles = [tex]\bold {=\dfrac {855}{22.4} = 38.169\ moles }[/tex] at STP.

m - molar mass  [tex]\bold {N_2}[/tex] =  

Put the values in the formula,

[tex]\bold {w = 38.169 \times 28 = 1068.73\ g}[/tex]

Therefore, the mass of the nitrogen gas in the 855 L tank at STP is 1068 g.

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Answer:

18.91 ml

Explanation:

Initial volume of base=2.04 ml

Final volume of base = 20.95 ml

Volume of base used= 20.95 - 2.04 = 18.91 ml

Note that the volume of base used is obtained as the difference between the final and initial volume of base, hence the answer given above.

Answer:

(b). Mass and distance.

Explanation:

The gravitational force between two objects is given by Newton's law of universal gravitation. The formula is as follows :

[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]

Here,

G is universal gravitational constant

r is the distance between two objects

It is very clear that the gravitational force is directly proportional to the product of masses and inversely proportional to the square of the distance between them.

Hence, the two quantities are used to predict gravitational force according to Newton's law of universal gravitation are mass and distance.

Answer:mass and distance

Explanation:

it’s correct

Answer:

Explanation:

Chemistry is the science that studies the composition, structure and properties of matter and the changes it undergoes during chemical reactions and their relationship with energy

Explanation:

Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.

Answer:

6.63

Explanation:

From the relationship;

pH = pKw/2

Pkw = 13.26

Then it follows that;

pH = 6.63

Hence if. pKw = 13.26, the pH = 6.63

Answer:

c- observations

hope this helps

Explanation:

Answer:

The correct answer would be - observing with the help of five senses.

Explanation:

To find and describe the physical properties of the given substance or the solution or liquid students can observe using their five senses. By looking at the liquid one can find its state and color, by smelling students can find the odor of the sample, by touching it one can observe and describe the texture.

Fluidity can also be measure by the touch if the solution is viscous or free-floating. By using a thermometer and using a graduated cylinder one can find the temperature at room temperature and the weight of substance respectively.

Answer:

Explanation:

move an object a greater distance than the distance that part of the machine was moved

Answer:

Explanation:

Answer:

Alkali Metals

Explanation:

Because they are in group one, but Hydrogen is not an alkali metal.

Answer:

Slower

Explanation:

Different forces, such as gravity, can affect an object in many ways.

Scenario 1: A car is climbing a hill and then starts to coast.

Here, when the car starts to not accelerate anymore, gravity could pull it to slow down and eventually stop.

Scenario 2: A car is speeding downwards.

Here, when the car isn't on the gas pedal, gravity could act upon the car and make it go faster.

forces can make things move faster or slower them down.

Answer:

The volume (mL) of 0.135 M NaOH that is required to neutralize 13.7 mL of 0.129 M HCl is 13.1 mL (option b).

Explanation:

The reaction between an acid and a base is called neutralization, forming a salt and water.

Salt is an ionic compound made up of an anion (positively charged ion) from the base and a cation (negatively charged ion) from the acid.

When an acid is neutralized, the amount of base added must equal the amount of acid initially present. This base quantity is said to be the equivalent quantity. In other words, at the equivalence point the stoichiometry of the reaction is exactly fulfilled (there are no limiting or excess reagents), therefore the numbers of moles of both will be in stoichiometric relationship. So:

V acid *M acid = V base *M base

where V represents the volume of solution and M the molar concentration of said solution.

In this case:

Replacing:

0.0137 L* 0.129 M= V base* 0.135 M

Solving:

[tex]V base=\frac{0.0137 L*0.129 M}{0.135 M}[/tex]

V base=0.0131 L = 13.1 mL

The volume (mL) of 0.135 M NaOH that is required to neutralize 13.7 mL of 0.129 M HCl is 13.1 mL (option b).

Answer:

Since elements in a group have the same number of valence electrons, they behave similarly in chemistry. An example would be the alkali metals (excepting hydrogen. Hydrogen is in this group only because it has one valence electron.

Explanation:

because it is

Answer:

See attached picture.

Explanation:

Hello,

In this case, for the given compound, since it is a salt, it contains a cation (positive charge) and an anion (negative charge), thus, since chlorine tends to gain electrons, it is negative whereas the nitrogen-containing side is positive, forming the anion and cation respectively. Moreover, for the drawing of its Lewis structure we must know that the chlorine is likely to interact via its seven valence electrons with nitrogen via its five valence electrons wherein four are bonded with four methyl radicals forming the tetramethylammonium chloride as shown on the attached picture.

We must realize that the nitrogen remain positively charged due to the presence of an extra bond with one methyl group (one carbon bonded to three hydrogens) which allow the formation of the salt.

Regards.

The Lewis structure for compound [tex](CH_3)_4NCl[/tex] is attached in the image below as an attachment.

Lewis  structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .

They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.

Thus, the Lewis structure for compound [tex](CH_3)_4NCl[/tex] is attached in the image below as an attachment.

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Answer:

183 cg = 0.00183 kg

0.25 kg = 250 g

Explanation:

Use conversion factors. 1kg is equal to 1 x 10^5 cg (100000) and 1 kg is equal to 1 x 10^3 grams (1000 grams).

Explanation:

the atomic radius of ( Sn) is 225pm

Answer:

Thickness = 5.0 * 10^-6 to 1 significant figure

Explanation:

Volume of oleic acid added:

2 drops when there are 100 drops per cm³ means that each drop has a volume of;

2 * 0.01 = 0.02 cm³

A 5% v/v oleic acid in solution will contain:

5/100 * 0.02 = 0.001 cm³ of oleic acid .

Area of circular film on the water surface = πr²

where r, radius = 16 /2 = 8cm, π = 3.14

Area = 3.14 * 8²

Area = 201 cm²

Since volume = area * height or thickness

Thickness = volume/area

Thickness = 0.001 cm³ / 201 cm²

Thickness = 0.00000498 or 4.98 * 10^-6 cm

Thickness = 5.0 * 10^-6 to 1 significant figure

Answer:

i believe it is 5

Explanation:

.......

Answer:

0.015 mol HCL

Explanation:

Molarity = moles solute/liters solution

Step 1: Define variables

M = 0.200

L = 75.0 mL

m = unknown, x

Step 2: Convert mL to L

1000 mL = 1 L

75.0 mL/1000 mL = 0.075 L

Step 3: Substitute

0.200 M = x mol/0.075 L

Step 4: Find x

x = 0.015 mol HCL

Answer:

1. Democritus - Matter was made of different kinds of things.

2. Bernoulli- Gases are formed from tiny particles so small you can’t see them. The particles are spread out into a certain area and move when people walk through them.

3. Priestley- Substances combine or break apart to create new, different substances.

Explanation:

1. Democritus was a philosopher who because of his immense contribution to atomic theory was regarded as the "FATHER OF SCIENCE". His idea was that matter was made of different kinds of things called which he called ATOMOS meaning ATOM.

2. Daniel Bernoulli was another outstanding mathematician and scientist who played a major part in the kinetic molecular theory of gases via his "HYDRODYNAMICA". His idea, which states that "gases are formed from tiny particles so small you can’t see them. The particles are spread out into a certain area and move when people walk through them"

was based on fluid dynamics.

3. Joseph Priestley is remarkably known for his 1774 discovery of oxygen. His findings that air is a mixture of gases and not just a substance made of one element paved the way for his idea that " Substances combine or break apart to create new, different substances".

Answer:

1. Democritus- Matter was made of

different kinds of things.

2. Bernoulli- Gases are formed from tiny particles so small you can't see them. The particles are spread out into a certain area and move when people walk through them.

3. Priestley- Substances combine or

break apart to create new different substances.

Explanation:

1. Democritus was a Greek philosopher regarded to be the "Father of Science". He discovered that all matter were composed of indestructible things he called ATOMOS. Hence, his idea was that Matter was made of different kinds of things (atoms).

2. David Bernoulli, a mathematician, was born in 1700. He contributed immensely to the kinetic molecular theory of gases. In his postulated theory, he gave the idea that gases are formed from tiny particles so small you can't see them. The particles are spread out into a certain area and move when people walk through them.

3. Priestley- Joseph Priestley, born in 1733, is widely known for his discovery of oxygen gas among other gases. His idea was that substances combine or

break apart to create new different substances.

Explanation:

aam= 90%•20amu+10%•22amu/100

aam= 2020/100

aam= 20.2

Taking into account the definition of atomic mass, isotopes and atomic mass of an element, the average mass of the element is 20.2.

First of all, you have to know that atoms are made up of protons and neutrons in a central nucleus, as well as an electronic cloud (the extra-nuclear zone), a place where there is a greater probability of finding electrons orbiting the nucleus of the atom.

Then, it is neccesary to know that the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus.

The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.

This is, isotopes are atoms whose atomic nuclei have the same number of protons but different numbers of neutrons.

Because the isotopes of an element have different atomic masses, the relative atomic mass or atomic weight is an average of the atomic masses of the different isotopes in a sample taking into account the relative abundance of each of them.

In this case, 90% of the isotopes have a mass number of 20 amu, while 10% have a mass number of 22 amu. Then, the average mass of the element can be calculated as:

20 amu×0.90 + 22 amu×0.10= 20.2

Finally, the average mass of the element is 20.2.

Learn more:

Answer:

Dipole-dipole interactions

Explanation:

Dipole-dipole interactions occur between two molecules with two polar end- a partially positive end and a partially negative end. The dipoles exists in these molecules due to the difference in the electronegativities of the atoms if the molecule. The positive end of a dipolar molecule will be attracted to the partially negative end of the neighboring molecule.

In the separation of molecules using silica gel as the adsorbent surface, the dominant interactive forces between the adsorbent and the materials to be separated are dipole-dipole interactions. The silica gel have polar SiOH groups on its surface which attracts polar molecules in the material to be separated. These polar molecules are strongly adsorbed to the silica gel surface whereas nonpolar or less polar molecules in the material to be separated are less strongly adsorbed, and thus, are eluted faster than the polar molecules.

Answer:

Earth's gravitational pull

Explanation:

Astronauts in the space shuttle float because they are in “free fall” around Earth, just like a satellite or the Moon. Again, it is gravity that provides the centripetal force that keeps them in circular motion.

Answer:

Which part of the immune system is a physical barrier?

> Skin.

How can individuals in communities prevent the global spread of hepatitis C?

> By avoiding the blood of other people.

A)skin is a physical barrier.

The physical barrier is incorporating the stratum corneum, corneocytes, and lipid layers, as well as the nucleated epidermis.

The skin provides an effective barrier between the organism and the environment, preventing the invasion of pathogens and fending off chemical and physical assaults, as well as the unregulated loss of water and solutes.

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Answer: SF6

Sulfur hexafluoride or sulphur hexafluoride, is an inorganic, colorless, odorless, non-flammable, non-toxic but extremely potent greenhouse gas, and an excellent electrical insulator. SF₆ has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom.

Answer:

Red blood cells

Explanation:

An average adult human has somewhere around 25 trillion red blood cells in their body.

Answer:

Heya! Maddie here! The answer is Red Blood Cells.

Explanation:

Hope this helps!

Answer:

Explanation:

1) A fulcrum is a pivot point that plays a central role (not necessarily located at the center) in a lever. The fulcrum of the attached picture has been circled (in blue).

2) The object placed on this lever's measurement tray is balanced by placing it at the center of the tray. This is the standard way of placing objects on any balance.

The fixed point on the rigid bar around which the machine (lever) can turn is called the fulcrum. It refers to the support that the lever rotates around. For instance, the midway or support is where the rod will pivot in the case of a common balance.

1) A fulcrum is a pivot point that plays a crucial (but not always essential) role in a lever. The accompanying image's fulcrum has been highlighted in blue with a circle.

2) By putting it in the middle of the measurement tray for this lever, the object is balanced. The norm for placing items on any balance is in this manner.

The pivotal point of the beam is known as the fulcrum. A load is applied at the other end of a lever when an effort is exerted on one end of the lever.

The fulcrum can be shown as follows:

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Answer:

[tex]\Delta \rho =2.22 g/mL[/tex]

Explanation:

Hello,

In this case, since a change in science is widely known to be considered as a subtraction between the the final and initial values of two measured variables and is represented via Δ, here the final density is 5.43 g/mL and the initial one was 3.21 g/mL, therefore, the change in density is:

[tex]\Delta \rho=\rho _f-\rho _i\\ \\\Delta \rho=5.43g/mL-3.21g/mL\\\\\Delta \rho =2.22 g/mL[/tex]

Best regards.

Answer: Ionic compound are made by strong electrostatic interactions  in the middle of ion , which will result in higher melting points and electrical conductivity when being compared to covalent compounds . covalent counds have bonds where the electrons are shared allying atoms .

Hoped I Helped-

Sleepy~