please help, I don't understand chemistry at all.
Density is a physical property of a molecule that’s measured as mass per unit volume.
(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3
).

Yes, the equilibrium constant of a reaction changes with temperature. This is because the reaction requires different energy at different temperatures thus the equilibrium constant changes.

In a forward endothermic reaction, the rate of reaction and thus equilibrium constant increases with a decrease in temperature similarly in a forward exothermic reaction, the equilibrium constant increases with an increase in the temperature.

An equilibrium constant doesn't change with the concentration of substrate and product or the volume of the container but does with the change in temperature. The position of equilibrium in a reaction might also change with the change in temperature.

Learn more about Equilibrium:

https://brainly.com/question/13414142

#SPJ4

Using the value of 1.27 g/cm^3 as silk density, calculate a fiber equivalent diameter in μm if such fiber linear density was 1 den: the fiber equivalent diameter in μm for a linear density of 1 den is 15.56 μm.

The first step is to understand the terms "value", "density", and "equivalent" in the context of the question.

Value refers to a numerical quantity that represents the worth or usefulness of something. In this case, the value is the density of silk, which is 1.27 g/cm^3.

Density refers to the mass of a substance per unit volume. In this case, it is the mass of silk per unit volume, which is expressed in grams per cubic centimeter (g/cm^3).

Equivalent refers to something that is equal or interchangeable with something else. In this case, it is the fiber equivalent diameter that is equivalent to a linear density of 1 den.

Now, to calculate the fiber equivalent diameter in μm, we need to use the formula:

Linear density (den) = mass (grams) / length (meters)

We know that the linear density is 1 den and the density of silk is 1.27 g/cm^3. We also know that the length is 9000 meters for 1 den (this is a standard conversion factor for denier).

So, we can rearrange the formula to solve for the mass:

Mass (grams) = linear density (den) x length (meters)

Substituting the values we know, we get:

Mass (grams) = 1 den x 9000 meters = 9000 grams

Now, we can use the density formula to calculate the volume of the silk:

Volume (cm^3) = mass (grams) / density (g/cm^3)

Substituting the values we know, we get:

Volume (cm^3) = 9000 grams / 1.27 g/cm^3 = 7086.61417 cm^3

Finally, we can use the formula for the diameter of a cylinder to solve for the fiber equivalent diameter:

Diameter (μm) = (4 x volume (cm^3) / π)^(1/3) x 10^4

Substituting the values we know, we get:

Diameter (μm) = (4 x 7086.61417 cm^3 / π)^(1/3) x 10^4 = 15.56 μm

Therefore, the fiber equivalent diameter in μm for a linear density of 1 den is 15.56 μm.

to learn more about diameter click here:

https://brainly.com/question/30460318

#SPJ11

The NaOH given to the student should weigh 46.3 grams.

The formula units can be calculated as moles multiplied by the Avogadro number.

Avogadro number is, 6.023 × 10^23.

The formula units are given to be 7.03 × 10^23.

Formula units = Avogadro Number × Number of moles

7.03 × 10^23 = 6.023 × 10^23 × Number of moles

Number of moles = (7.03 × 10^23)/(6.033 × 10^23)

Number of moles = 1.16

One mole of NaOH has the mass 39.99 grams.

1.16 moles of NaOH has mass = 1.16 × 39.99 grams.

= 46.38 grams.

Hence, the NaOH should weigh 46.3 grams.

To know more about the formula units, here

brainly.com/question/21494857

#SPJ4

According to Rutherford's theory, an atom's nucleus is surrounded by electrons that are negatively charged. He also asserted that the electrons that surround the nucleus travel in a circular pattern at extremely high speeds. Here the statement most of the volume of hydrogen atoms is due to the nucleus is not correct. The correct option is D.

The atomic structure of the elements was hypothesized by Rutherford. He emphasized that an atom contains a positively charged particle and that this region of the atom contains the majority of its mass.

The Rutherford model states that the majority of an atom's volume is empty and that the nucleus occupies a very small area of space at its center. As a result, the assertion is at odds with the Rutherford model.

Thus the correct option is D.

To know more about Rutherford model, visit;

https://brainly.com/question/21373854

#SPJ4

Your question is incomplete most probably your full question was:

Identify the incorrect statement among the following.

A. Aluminum atoms have 13 protons in the nucleus and 22 electrons outside the nucleus.

B. Helium atoms have two protons in the nucleus and two electrons outside the nucleus.

C. The majority of the mass of a nitrogen atom is due to its seven electrons.

D. Most of the volume of hydrogen atoms is due to the nucleus

Answer:

Explanation:

The ozone layer acts as a shield for life on Earth. Ozone is good at trapping a type of radiation called ultraviolet radiation, or UV light, which can penetrate organisms' protective layers, like skin, damaging DNA molecules in plants and animals.

Answer:

Solid

1. Stone

2. Brick

Liquid

1. Water

2. Oil

Gas

1. Oxygen

2. Nitrogen

Answer:

rock and sand, water and steam, smoke and hydrogen

Explanation:

rock and sand are solids, water and steam are liquids, smoke and hydrogen are gases. trust me i know this

Answer:

Explanation:

Carbon monoxide →  Prevents oxygen from being transported in the body

Nitrogen oxides → Can cause asthma

Particulate matter → Irritates lungs, dizziness, seizures, or death

Sulfur oxides → Inflammation and irritation of the respiratory system

I hope this helps!

sodium hydroxide

cobalt (II) phosphide

lead (IV) carbonate

Magnesium fluoride

lithium sulfite

ammonium phosphate

iron (II) oxide

calcium sulfate

silver nitride

sodium sulfide

Answer:

\(c=3.71\ J/g^{\circ} C\)

Explanation:

Given that,

Mass of sample, m = 996.9 g

The change in temperature of the sample, \(\Delta T=-70.98^{\circ}C\)

Heat produced, Q = 62.9  calories = 263173.6 J

The heat released by a sample due to change in temperature is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat capacity

So,

\(c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{263173.6}{996.9\times 70.98}\\\\c=3.71\ J/g^{\circ} C\)

So, the specific heat of ethanol is equal to \(3.71\ J/g^{\circ} C\).

Answer:

True

Explanation:

Volume is measured in "cubic" units. The volume of a figure is the number of cubes required to fill it completely, like blocks in a box. Volume of a cube = side times side times side. Since each side of a square is the same, it can simply be the length of one side cubed.

Polymers are materials made of long, repeating chains of molecules.  

Polymers are the materials that have unique properties, depending on the type of molecules being bonded and how they are bonded. Some polymers are bended and stretched, like rubber and polyester.

In general,  polymer is considered as a class of natural or synthetic substances that comprises of very large molecules, called macromolecules, these are multiplication of smaller chemical units called monomers. Thus, A polymer is made up of a number of joined-together monomers. Polymers are used to make many of the materials that can be used by humans and are used as raw material for man-made materials.

To learn more about Polymers ,here

brainly.com/question/17354715

#SPJ4

Answer:30.573 Billion atoms are in one gram

Explanation:

Answer:

the answer base on my test is H3O4P1

Answer:

O 6

Explanation:

Oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Answer:

23.6°C

Explanation:

use delta h method

Answer:

Ley.

Explanation:

En la teoría de la ciencia, la regularidad de los procesos en la naturaleza se denomina ley de la naturaleza. Las leyes naturales se diferencian de otras leyes en que los seres humanos no pueden ponerlas en vigor ni anularlas a su discreción. En tal sentido, la composición química del agua es indudablemente una ley natural, en tanto el hombre no puede modificarla sin modificar las características inherentes del agua como tal.

The balanced nuclear equations for the following:(c) Alpha decay of ²¹²₈₃Bi is ^22688Ra → ^22286Rn + ^42He

Alpha decay usually occurs in heavy nuclei such as uranium or plutonium, and therefore is a major part of the radioactive fallout from a nuclear explosion.

Alpha decay occurs most often in massive nuclei that have too large a proton to neutron ratio. An alpha particle, with its two protons and two neutrons, is a very stable configuration of particles.

Learn more about alpha decay here:

brainly.com/question/1898040

#SPJ4

Answer: B. Metal

Explanation: The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium Hope This Helped (=^･-･^=)

The types of biochemical reactions that are primarily reductive in nature are known as reduction reactions. Reduction reactions involve the gain of electrons or the decrease in oxidation state of a molecule, resulting in a reduction in its overall energy or the transfer of electrons from a donor to an acceptor molecule.

One prominent example of a reductive biochemical reaction is photosynthesis, where plants and some bacteria use sunlight energy to convert carbon dioxide (CO2) into glucose. In this process, carbon dioxide is reduced to glucose by accepting electrons and hydrogen atoms from water molecules. Another example is cellular respiration, specifically the electron transport chain, where electrons derived from the breakdown of glucose and other fuel molecules are transferred through a series of redox reactions, resulting in the reduction of molecular oxygen (O2) to water (H2O) as the final electron acceptor.

Learn  more about biochemical reaction here: brainly.com/question/13314092

#SPJ11

Sodium chloride is white, crystalline solid at room temperature.

It is a compound whose components atoms are sodium and chlorine.

The atoms of the two elements combine chemically through an ionic bond. The sodium donates it valence electron to the chlorine atom.

Thus, sodium chloride is an ionic compound. It has a characteristic white appearance and crystalline structure.

The compound is a solid at room temperature. It has a melting point of 801 °C.

More on sodium chloride can be found here: https://brainly.com/question/9811771

#SPJ1

Answer: 1.45M

Explanation:

The definition of molarity is moles/liter.  The neutralization of NaOH with HI is:

HI + NaOH = NaI  + H2O

One mole of HI reacts with 1 mole of NaOH.  We'll assume this is a titration reaction and that the 10.00ml sample of NaOH contains the same number of moles as the 56.75ml of 0.256M HI.

Moles HI:  (0.256 moles/liter)*(0.05675 L) = 0.01453 moles HI

That means we muct have 0.01453 moles NaOH in 10.0ml of NaOH solution.

(0.01453 moles NaOH)/(0.010L) = 1.45 M

==

Another approach is to use the relationship M1V1 = M2V2, which is useful for titrations (M is concentration and V is volume):

We want M2, so rearrange:  M2 = M1V1/V2

M2 = (0.256M)*(56.75ml)/(10.0ml)

M2 = 1.45M

The density of Xe gas at a pressure of 788 mmHg, a volume of 830 mL, and 37°C is approximately 5.65 g/L.

To calculate the density of Xe gas at a given pressure, volume, and temperature, we can use the ideal gas law, which states:

PV = nRT

Where:

P = Pressure (in atmospheres)

V = Volume (in liters)

n = Number of moles

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature (in Kelvin)

First, let's convert the given values to the appropriate units:

Pressure = 788 mmHg = 788/760 atm ≈ 1.037 atm

Volume = 830 mL = 830/1000 L = 0.83 L

Temperature = 37°C = 37 + 273.15 K = 310.15 K

Now we can rearrange the ideal gas law equation to solve for density:

Density = (n * M) / V

Where:

M = Molar mass of Xe (131.29 g/mol)

To determine the number of moles (n), we can rearrange the ideal gas law equation:

n = (PV) / (RT)

Substituting the given values:

n = (1.037 atm * 0.83 L) / (0.0821 L·atm/(mol·K) * 310.15 K)

n ≈ 0.0358 mol

Now we can calculate the density:

Density = (0.0358 mol * 131.29 g/mol) / 0.83 L

Density ≈ 5.65 g/L

Therefore, the density of Xe gas at a pressure of 788 mmHg, a volume of 830 mL, and 37°C is approximately 5.65 g/L.

Note: None of the answer choices provided match the calculated density, so the correct answer is not among the given options.

To learn more about Xe gas refer here:

https://brainly.com/question/28232484

#SPJ11

Answer:

The answer is 3.87 J/g°C

Explanation:

Here is the equation we are going to use:

\(C=\frac{q}{mT}\)

C= specfic heat in J/g°C

q = heat in joules (J)

m = mass in grams (g)

T = change in temperature

Here is what is given:

q = 849 J

m = 95.4 g

T = 48.0 - 25.0 = 23°C

Find:

Specific heat capacity in J/g

The first thing we are going to do is plug everything into the equation:

\(C = \frac{849J}{(9.54g)(23degreesC)}\)

Then we are going to solve for C

\(C = \frac{849J}{219.42gC} = 3.87 J/gCelsius\)

Hope this helps!

Answer:

The answer is 3.87 J/gC

Answer:

because the water/air needs to be pumped out.

Explanation:

hoped this helped! (just give it a 1 star if it didn't)

Answer: D. C and O

Reason: Both Carbon and Oxygen are nonmetals and covalent bonds occur between nonmetals on the periodic table.

Answer:

its c and o

Explanation:

After looking at answers I agree with the statement Chemistry is fun.

Answer:

Question 1:

Answer: True

• A nucleus comprises of "proton and neutron"

Question 2:

Answer: True

• Lithium atom has 3 protons while helium atom has 2 protons.

Question 3:

Answer: False

• Molecular compounds are formed when elements are combined be it metal or non-metal.

• A compound formed from a metal and non-metal is an ionic compound.

Question 4:

Answer: False

• Noble gases are inert / unreactive. They don't undergo any reaction because they are very stable.

Question 5:

Answer: True

Question 6:

Answer: False

\({ \rm{H _{2}O \: \dashrightarrow \: water}}\)

• The formular in the question is for hydrogen peroxide.

Question 7:

Answer: False

• What you have to know is that, molecular compounds such as halogens are made of discrete particles with weak vander waals forces of attraction, hence energy required to break these forces is quite low. Hence low melting points.

Question 8:

Answer: True

• Ionic compounds such as sodium chloride are highly soluble in water.

Question 9:

Answer: False

• Water is a polar covalent compound because it is formed due to hydrogen and covalent bonding. It is polar because oxygen is highly electronegative than hydrogen.

Question 10:

Answer: False

• Check answer for question 4

Question 11:

Answer: False

• They form charge of +1

Question 12:

Answer: True

• This are called radicals

Question 13:

Answer: False

• least reactive families are halogens and noble gases.

Question 14:

Answer: True

• This is a situation of ionic bonding.

Question 15:

Answer: False

• It is made up of 3 atoms.

In chemistry, when an acid and a base react with each other, they neutralize to form a salt and water. This neutralization reaction occurs when the hydrogen ions (H+) in the acid react with the hydroxide ions (OH-) in the base.

During the reaction, the hydrogen and hydroxide ions combine to form water, while the remaining ions combine to form a salt. The acid and base are referred to as reactants in this reaction, as they are the starting materials that react with each other to produce the salt and water.

The products of the reaction are the salt and water that are formed. This neutralization reaction is an example of an ionic reaction, as it involves the transfer of electrons between the two reactants. The reaction is also exothermic, meaning that it releases energy in the form of heat.

Know more about neutralization reaction here

https://brainly.com/question/28970253#

#SPJ11