How many grams are KBr are needed to make a saturated solution in 100g of water at 30c

Answer:the volume will be doubled

Explanation: the expression from the question clearly indicates Charles' law. Charles' law states that volume is proportional to temperature at constant pressure. This simply means as one variable increase, the other variable will also increase. Please see attachment for mathematical explanation

Answer:

A. fairly constant

Explanation:

In photosynthesis plants used carbon dioxide and produced oxygen while in respiration oxygen is taken and carbon dioxide is released thus level of both gases remain constant.

Aerobic respiration

It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

Photosynthesis:

It is the process in which in the presence of sun light and chlorophyll by using carbon dioxide and water plants produce the oxygen and glucose.

Carbon dioxide + water + energy →   glucose + oxygen

water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture  by chloroplast.

Chemical equation:

6H₂O + 6CO₂ + energy  →   C₆H₁₂O₆ + 6O₂

Answer:

option C = 9.0 x 10²³ atoms

Explanation:

Data Given:

no. of moles of tin (Sn) atoms = 1.5 moles

no. of tin (Sn) atoms = ?

Solution:

Formula used to find number of atoms

                  no. of moles = no. of atoms / Avogadro's number

Rearrange the above equation:

          no. of atoms =   no. of moles x Avogadro's number . . . . . . (1)

Where

Avogadro's number = 6.022 x 10²³

Put values in equation 1

           no. of atoms = 1.5 x 6.022 x 10²³

           no. of atoms = 9.033 x 10²³

Round the figure = 9.0 x 10²³ atoms

So option C is correct

Answer:

Mass = 2.222 g

Explanation:

Given data:

Volume of  neon gas = 2.56 L

Temperature = 273 K

Pressure = 1 atm

Mass of neon gas = ?

Solution:

PV = nRT

n = PV / RT

n = 1 atm × 2.56 L/ 0.0821 atm. L / mol. K× 273 K

n = 2.56 L.atm / 22.4 atm. L/ mol

n = 0.11 mol

Mass = number of moles × molar mass

Mass = 0.11 mol × 20.2 g/mol

Mass = 2.222 g

Answer:

Mercury is the only metal that's liquid at room temperature, bromine and iodine are the other

Explanation:

11 elements are gases

Others are solid

Answer:

Explanation:

the question is a bit confusing, but if i'm understanding correctly the answer is non-metals... some non-metals are gasses (all of the noble gasses), some are liquid (mercury and bromine), and some are solids (all the rest).

however, not all metals are solid at room temp, there are a few exceptions.

Answer:

sea floor spreading

Explanation: hfhgg

Answer:

87.29×10²³ atoms

Explanation:

Nᴀ=6.02×10²³ (constant)

N=n×Nᴀ=14.5×6.02×10²³=87.29×10²³

In this reaction, Cl2 is reduced to form HCl and HBr is oxidized to form Br2.

In this reaction, Cl2 is being reduced to form HCl, and HBr is being oxidized to form Br2. The substance being reduced gains electrons, while the substance being oxidized loses electrons.

Cl2 + 2HBr → 2HCl + Br2

Cl2 is the oxidizing agent because it causes the oxidation of HBr, and HBr is the reducing agent because it causes the reduction of Cl2. The oxidizing agent is the species that gets reduced, while the reducing agent is the species that gets oxidized.

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Final answer:

In the reaction Cl2 + 2HBr → 2HCl + Br2, HBr is oxidized and Cl2 is reduced, making the correct choice A) HBr oxidized; HCl reduced.

Explanation:

In the reaction Cl2 + 2HBr → 2HCl + Br2, the substance being oxidized is HBr and the substance being reduced is Cl2. According to the provided half-reactions, oxidation involves the loss of electrons, and in this case, Br− (from HBr) loses electrons to form Br2. Conversely, the reduction involves the gain of electrons where Cl2 gains electrons to form 2Cl− (from HCl).

Therefore, the answer to the question is that HBr is oxidized; Cl2 is reduced, making the correct choice: A) HBr oxidized; HCl reduced. The oxidizing agent is Cl2 and the reducing agent is Br− from HBr.

Answer:

a carboxylic acid and an amine

Explanation:

A functional group is an atom or group of atoms inside a molecule that has comparable chemical properties anytime it appears in numerous compounds. When other parts of the molecule are not similar, some functional groups react in certain manners.

Carboxylic acid is a carbonyl-containing functional group, with carbon atom bonded to an hydroxyl group on one side and on the other side is either a carbon or hydrogen atom.  

An amine group is composed of a nitrogen atom bonded to a combination of carbon and hydrogen atoms.

Answer:

56.44 %

Explanation:

The formula of copper(II) sulfate pentahydrate is [tex]CuSO_4\cdot 5H_2O[/tex].

In order to calculate the mass percentage of water in it, we may assume that we have 1 mol of copper(II) sulfate pentahydrate. In general, the mass percentage is a ratio between the mass of a component and the total mass of the compound expressed in percent:

[tex]\omega = \frac{m_c}{m_t}\cdot 100 \%[/tex]

Since we're taking 1 mole of a substance here, we may state that the mass percentage of water will be calculating using molar masses instead:

[tex]\omega_{H_2O} = \frac{5M_{H_2O}}{M_{CuSO_4\cdot 5 H_2O}}\cdot 100 \%[/tex]

Notice that we take 5 molar masses of water, as 1 mole of copper(II) sulfate pentahydrate contains 5 moles of water molecules, then:

[tex]\omega_{H_2O} = \frac{5\cdot 18.016 g/mol}{159.609 g/mol}\cdot 100 \% = 56.44 \%[/tex]

gold:element

salt solution: mixture

bronze: compound

calcium carbonate: compound

hydrogen: element

soil: mixture

3CaCl₂ + 2Na₃PO₄→ Ca₃(PO₄)₂ + 6NaCl

We are given the Equation;

CaCl₂ + Na₃PO₄→ Ca₃(PO₄)₂ + NaCl

Assuming the question requires us to balance the equation;

In this case;

3CaCl₂ + 2Na₃PO₄→ Ca₃(PO₄)₂ + 6NaCl

Answer:

When a basketball player jumps to make a shot, _____

The downward force on the floor is equal to the upward force on his feet

Explanation:

According to Newton's Third Law of motion :

For every action there is equal and opposite reaction .

Hence when the  basketball player jumps to make a shot, The gravity (downward force) and his energy (upward force on his feet) exert equal forces on each other in opposite directions.

Answer:

Cells

Explanation:

High-powered microscopes are used in order to see microscopical (extremely small) structures of objects that cannot be seen with a naked eye.

When we look at a leaf, we will see the composition of it and the structural patterns that we couldn't see clearly or at all without a microscope.

Leaves consist of cells and spores (stomata) between the cells. Using a microscope will enable us to see them.

Answer:

4d¹ electron has quantum numbers

n=4; l=2; ml= -2; ms= 1/2

Explanation:

There are 4 quantum numbers, namely

the principal quantum number (n)

the orbital angular momentum quantum number (l)

the magnetic quantum number (ml)

the electron spin quantum number (ms)

The principal quantum number describes the orbit or shell of the electron

here n = 4 ⇒ electron is in 4th shell

the orbital angular momentum quantum number describes the shape of orbital the electron is present in.

l= 0 ⇒ s-orbital

l= 1 ⇒ p-orbital

l= 2 ⇒ d-orbital

l= 3 ⇒ f-orbital

In our case l= 2 ⇒ p-orbital

ml specifies in which orbital electron is present of given shape

ml has 2l+1 values,which range from -1 to +l

here l = 2 ⇒ ml has 2(2)+1 = 5 values (-2 to +2)

so electron is present in one of the five d-orbitals

ms represents the spin of electron (+1/2 or -1/2)

If  +1/2 represents clockwise then -1/2 represents anti-clockwise and vice-versa.

⇒  4d¹ electron has quantum numbers

n=4; l=2; ml= -2; ms= 1/2.

An electron with quantum numbers n=4, l=2, ml=-2, ms=1/2 is located in the fourth energy level of an atom, within a 'd' shaped orbital pointing in a predetermined space direction, with an upward spin.

The student's question refers to a specific electron in an atom characterized by four quantum numbers: principal quantum number (n=4), azimuthal quantum number (l=2), magnetic quantum number (ml=-2), and spin quantum number (ms=1/2). These quantum numbers reveal the electron's energy level, shape, orientation in space, and spin direction, respectively.

Therefore, an electron with these quantum numbers is found in the fourth energy level (n=4) of an atom. The shape of the orbital where this electron is located is a 'd' orbital (l=2). The negative sign of the magnetic quantum number reveals that the orbital is oriented in one of the five spatial orientations possible for 'd' orbitals. Lastly, the spin quantum number of 1/2 means the electron's spin is up.

This shows the student's question is related to quantum mechanics studies in chemistry and physics, specifically atomic structure and electron configuration.

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Answer:

According to Bohr's theory, an electron's path around the nucleus defines its

energy level.

Explanation:

It the certain energy by which the electrons have occupied there place in the orbitals. They can also be moved to the higher energy level by taking the energy from the surrounding. The emission of light can be seen when the electron falls from the higher energy state to the lower state. The orbital that is close to the atomic centre having the lowest energy level and the one that is found to be far away from the atomic centre has the highest energy level.

According to Bohr's theory, an electron's path around the nucleus defines its

d. Energy level.

It the specific energy by which the electrons have involved there place in the orbitals. They can likewise be moved to the higher energy level by taking the energy from the encompassing. The outflow of light should be visible when the electron tumbles from the higher energy state to the lower state. The orbital that is near the nuclear focus having the most reduced energy level and the one that is viewed as distant from the nuclear focus has the most noteworthy energy level.

Thus, correct option is d.

Find more information about Bohr's theory here:

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The Law of Conservation of Energy states that The total energy of an isolated system is constant. Energy can neither be created nor destroyed. It can only be transformed from one form to another or transferred from one system to another.

The mass of 6.45 x 10²² atoms of carbon​ is 12.864 grams

To calculate the mass of 6.45 x 10²² atoms of carbon, divide the number of atoms by Avogadro's number to get the number of moles, then multiply by the molar mass of carbon (12.011 g/mol) to find the mass in grams.

To calculate the mass of 6.45 x 10²² atoms of carbon, we will use Avogadro's number and the molar mass of carbon. Avogadro's number is 6.022 x 10²³ particles/mol, and the molar mass of carbon is 12.011 g/mol. We use these constants as conversion factors.

First, find the number of moles of carbon atoms:

Number of moles = (6.45 x 10²² atoms C) / (6.022 x 10²³ atoms/mol)

Number of moles = 1.071mol

The next step will be to convert these moles to grams using the molar mass of carbon:

Mass of carbon = Number of moles x Molar mass of carbon

Mass of carbon = 1.071 mol x 12.011 g/mol

Make the calculation and the result will give you the mass in 12.864 grams.

Foliation:

exfoliation :

Answer:

Making oxygen

Oxygen can be made from hydrogen peroxide, which decomposes slowly to form water and oxygen:

hydrogen peroxide → water + oxygen

2H2O2(aq) → 2H2O(l) + O2(g)

The rate of reaction can be increased using a catalyst, manganese(IV) oxide. When manganese(IV) oxide is added to hydrogen peroxide, bubbles of oxygen are given off.

Apparatus arranged to measure the volume of gas in a reaction. Reaction mixture is in a flask and gas travels out through a pipe in the top and down into a trough of water. It then bubbles up through a beehive shelf into an upturned glass jar filled with water. The gas collects at the top of the jar, forcing water out into the trough below.

To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.

Instead of the gas jar and water bath, a gas syringe could be used to collect the oxygen.

Answer:

D. a very fast run

Explanation:

Fermentation :

The second step of anaerobic respiration is fermentation. It involve the fermentation of pyruvate into lactic acid or alcohol depending upon the organism in which it is taking place. There is no ATP produced, however carbon dioxide is released in this step.

Anaerobic respiration in plants:

Anaerobic respiration in plants produced ethanol which if accumulate then cause the harmful effect in plants. It is also occur in some microorganisms such as yeast.

C₆H₁₂O₆  →   2C₂H₅OH  + 2CO₂

Anaerobic respiration in animals:

Anaerobic respiration in animals pyruvate converted into lactic acid and it is not as harmful as ethanol in plant if accumulate. It is produced during exercise because oxygen is not supplied to muscles. It can produce the cramps which can be cured with massage.

C₆H₁₂O₆  →   2C₃H₆O₃

Answer:

Formula unit mass of [tex]NaHCO_{3}[/tex] is 84 u.

Explanation:

Formula unit mass can be calculated by the adding individual element mass in the formula of the compound.

The given compound - [tex]NaHCO_{3}[/tex]

From the given the atomic mass of each element in the given compound is as follows.

Atomic mass of sodium (Na) = 23 u

Atomic mass of Hydrogen (H) = 1 u

Atomic mass of carbon (c) = 12 u

Atomic mass of oxygen (O) = 16 u

The number of atoms in the formula:

1 sodium atom =23 u

1 hydrogen atom = 1 u

1 carbon atom =  12 u

3 oxygen atom = 3 X 16 u = 48 u

_____________________________

Formula mass = 84 u

_______________________________

Therefore, Formula unit mass of [tex]NaHCO_{3}[/tex] is 84 u.

Answer:

A chemical equation can be described as a symbolic representation of a chemical reaction. It can be written in the form of words or symbols.

The following chemical reaction can be completed as :

Na2SO4·10H2O + 2C = Na2S + 10H2O + 2CO2

Sodium Sulfate Decahydrate + Diamond = Sodium Sulfide + Water + Carbon Dioxide

The products of the reaction are:

Answer:

3.011 × 10²³ particles

Explanation:

Given data:

Number of moles = 0.5 mol

Number of particles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

one mole of substance =  6.022 × 10²³ particles

For 0.5 mole of substance:

0.5 mol × 6.022 × 10²³ particles / 1 mol

3.011 × 10²³ particles

Answer:

0.0286 mol Cl

Explanation:

to convert atoms to moles, we need Avogadro's number.

1 mol= 6.02 x 10^23 atoms

1.72 x 10^22 atoms (1 mol/ 6.02 x 10^23)= 0.0286 moles

Answer:

88.04moles

Explanation:

Nᴀ=6.02×10²³ (constant)

n=N/Nᴀ=

[tex] = \frac{ {5.3 \times 10}^{25} }{ {6.02 \times 10}^{23} } = 88.04moles[/tex]

We can convert the number of molecules to moles by dividing the number of molecules by Avogadro's number. In this case, 5.3 x 10²⁵ molecules of CO₂ is approximately equal to 88.04 moles.

To solve the student's problem, we need to find the number of moles in 5.3 x 10²⁵ molecules of CO₂. We do this by dividing the number of molecules by Avogadro's number (approximately 6.02 x 10²³ mol-1), a constant which tells us the number of molecules in a mole.

So, the calculation is as follows:

Number of Moles = (Number of molecules) / (Avogadro's number)

Which in this case becomes: Number of Moles = (5.3 x 10²⁵ molecules) / (6.02 x 10²³ mol⁻¹) ≈ 88.04 moles

So, 5.3 x 10^25 molecules of CO₂ is approximately equal to 88.04 moles.

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Explanation:

Characteristics of electric energy Typically, these negative electrical charges (electrons) move through the electrical conductor. Normally the conductor is made of a metallic material because they have a greater amount of free electrons. Electrons and protons are charged particles within an electric field.

Electrical energy is the ability of electric charges to perform work due to their relative positions. It is continuously converted to other forms of energy in an electric circuit, and it can also be generated mechanically and stored for later use.

Electrical energy, which falls under the broader category of physical energy forms, has some distinct features. Firstly, electrical energy is the ability of charged particles to perform work as a result of their positions relative to each other - this is also referred to as electric potential energy. It's important to note that positive charges usually move from regions of high potential to low while negative ones do the opposite.

Secondly, electrical energy is commonly present in electric circuits where it gets continually converted into other forms of energy. For instance, in a conductor, the electrical energy transforms into thermal energy. These energy conversions are radically important because they illustrate the principle of energy conservation, which states that energy can neither be created nor destroyed, only transformed.

Lastly, electrical energy is produced mechanically by moving a conductor through a magnetic field and stored in devices such as batteries and capacitors for future use. In biological systems, electrolytes in cells and body fluids supply electrical energy, leading to voltage changes that aid in transmitting impulses in nerve and muscle cells.

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Answer:

Not necessarily

Explanation:

The answer would be: not necessarily, there is no such requirement.

Whenever we're multiplying in scientific notation, we may simply multiply the numbers separately and the rest separately. Let's say that in a general case we have two numbers:

[tex]n_1 = a \cdot 10^b[/tex]

[tex]n_2 = c \cdot 10^d[/tex]

In order to multiply them, we:

Let's apply this for some specific example, say, we have:

[tex]n_1 = 2\cdot 10^3[/tex]

[tex]n_2 = 3\cdot 10^4[/tex]