1. Under what conditions can potassium bromide conduct electricity?
A only when melted
B. when melted or dissolved in water
C. only when it is in crystal form
D. only when dissolved

Answer:

It is conserved

Explanation:

A week late (hehe)

During the given situation, the energy is conserved because, the energy lost by the person is gained by the box and becomes warm so the total energy is conserved.

The conservation of energy is a fundamental principle in physics that states that energy cannot be created or destroyed, but only transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time.

The principle of conservation of energy is based on the understanding that energy exists in different forms, such as mechanical energy, thermal energy, electrical energy, chemical energy, and others. Energy can be converted from one form to another, but the total amount of energy in the system remains the same.

Therefore, for the given situation, the energy is conserved because, the energy lost by the person is gained by the box and becomes warm so the total energy is conserved.

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Answer:

The number of hydrogen atoms in 36.04 g  sample of steam is 2.408 × 10²⁴ atoms of hydrogen

Explanation:

The  given parameters are;

The mass of the sample of water, H₂O = 36.04 g

From the principle of conservation of matter, the mass of the water = The mass of the steam, therefore;

The mass of the steam = 36.04 g

The molar mass of H₂O = 18.01528 g/mol

Therefore, the number of moles, n, of H₂O in the 36.04 g of steam is given as follows;

n = Mass/(Molar Mass) = (36.04 g)/(18.01528 g/mol) = 2.00052399963 ≈ 2 moles

The number of molecules of H₂O per mole of H₂O is geven by the Avogadro's number = 6.02 × 10²³ molecules

Therefore;

The number of H₂O in 2 moles of H₂O = 2 × 6.02 × 10²³ = 1.204 × 10²⁴ molecules

The number of hydrogen atoms per molecule of H₂O = 2 hydrogen atoms

Therefore;

The number of hydrogen atoms in the 1.204 × 10²⁴ molecules of H₂O = 2 × 1.204 × 10²⁴ molecules of H₂O

Which gives;

The number of hydrogen atoms in the 1.204 × 10²⁴ molecules of H₂O = 2.408 × 10²⁴ atoms of hydrogen

Therefore;

The number of hydrogen atoms in 36.04 g  sample of steam = 2.408 × 10²⁴ atoms of hydrogen.

3.9 tons of A and 1.8 tons of B must be burned for Steam power plants.

Steam power plants consist of boilers, steam turbines, generators, and other ancillary equipment. Boilers produce high pressure, high temperature steam. A steam turbine converts the thermal energy of steam into mechanical energy. The generator then converts mechanical energy into electrical energy. 

The amount of tons of each type of coal the Steam power plants must have burned is represented by the vector equation:

x1v1 + x2v2 = b

\(\left[\begin{array}{ccc}27.6&3100&250\\30&6400&360\\23&23610&1623\end{array}\right]\)

where first row represents v1, second row represents v2 and third row represents v3.

3.9 tons of A and 1.8 tons of B must be burned.

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Answer:

D :)

Explanation:

Cells die and the new cells that are being produced are replaced by new living cells. (If cell division prevented cancer, we'd all be saved by now.)

Cell division is carried to produce new identical cells to during reproduction as well to replace old and diseased cells.  Thus option C is correct.

Cell division is the process of multiplication of a cell into two identical daughter cells. Cell division is taking place in all living organism by which they reproduce and repair cells.

Cell division takes places through several stages namely,  interphase, telophase etc. There are different methods of cell division such as mitosis, meiosis, binary fission etc.

Different level of organisms follows different methods for cell division. In eukaryotes, mitosis takes place where genetically identical daughter cells are produced. It is called vegetative division.

In reproductive cell division the number of chromosomes will be reduced in daughter cell to half or that in parent cells. Thus in a cell cycle , the odl cells are replaced by new cells and identical offsprings are created by cell division. Hence, option C is correct.

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Answer:

H20 Covalent bond

Kl Ionic bond

NaBr ionic bond

Co2 Covalent bond

MgCl2 ionic bond

HCl Covalent bond

Explanation:

No approximations or assumptions need to be made in the calculation of the pH and the tartrate ion 1C4H4O6 2-2 concentration for a 0.250 M solution of tartaric acid.

The pH and the tartrate ion 1C4H4O6 2-2 concentration of a 0.250 M solution of tartaric acid can be calculated using the acid-dissociation constants and the Henderson-Hasselbalch equation. The acid-dissociation constants (Ka1 and Ka2) of tartaric acid are 1.14x10-2 and 5.01x10-5, respectively.

The pH of the solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([base]/[acid]) where [base] is the concentration of the conjugate base (the tartrate ion) and [acid] is the concentration of the acid (tartaric acid). Since the solution is 0.250 M in tartaric acid, [acid] = 0.250 M and [base] = 0.250 M - [tartrate ion], which can be calculated using the Ka1 and Ka2 values.

For Ka1, the tartrate ion 1C4H4O6 2-2 concentration can be calculated as 0.250 M - 0.250 * 1.14x10-2 = 0.249 M. For Ka2, the tartrate ion 1C4H4O6 2-2 concentration can be calculated as 0.250 M - 0.250 * 5.01x10-5 = 0.249 M.

Using the Henderson-Hasselbalch equation, the pH of the solution can be calculated as pH = pKa + log([base]/[acid]). The pKa values of tartaric acid are 3.92 and 5.63 respectively. Therefore, for Ka1, the pH of the solution can be calculated as pH = 3.92 + log(0.249/0.250) = 3.91, and for Ka2, the pH of the solution can be calculated as pH = 5.63 + log(0.249/0.250) = 5.63.

No approximations or assumptions need to be made in the calculation of the pH and the tartrate ion 1C4H4O6 2-2 concentration for a 0.250 M solution of tartaric acid, as the Henderson-Hasselbalch equation and the acid-dissociation constants of tartaric acid can be used.

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Answer:

energy stored is potential.

Explanation:

In a schematic illustration of a compound called a Lewis structure, the atoms and their associated electrons are shown. 

As a result, each fluorine and oxygen atom contains three lone electron pairs and six non-bonding electrons.

The equatorial plane The two F atoms would occupy the axial places in accordance with Bent's Rule, and the other two F atoms, along with the oxygen atom, would occupy the equatorial positions. This would result in a triangular bipyramidal structure.

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t’ = 22.6 years  The half-life of curium-243

Assuming that the radioactive decay of Curium is of 1st order, therefore the rate equation is in the form of:

A = Ao e^(-kt)

where,

A = amount after t years = 2755

Ao = initial amount = 3312

k = rate constant

t = number of years passed = 6

Therefore the rate constant is:

2755/3312 = e^(-6k)

-6k = ln (2755/3312)

k = 0.0307/yr

The half life, t’, can be calculated using the formula:

t’ = ln 2 / k

Substituting the value of k:

t’ = ln 2 / 0.0307

t’ = 22.586 years

or

t’ = 22.6 years

Is curium used in bombs?

Curium isotopes have been detected in the fallout regions of US nuclear hydrogen bomb test sites, and in spent nuclear fuel. Uses of curium are limited, but it served as a source of α-particles on the X-ray spectrometer on several Mars Rovers.

What does curium do to the body?

It tarnishes rapidly in air. Curium has been used to provide power to electrical equipment used on space missions. Curium has no known biological role. It is toxic due to its radioactivity.

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The efficacy of alcohol, specifically ethanol, as a temporary treatment for poisoning with ethylene glycol can be explained by its ability to competitively inhibit the metabolism of ethylene glycol in the liver.

Ethylene glycol is a toxic substance found in certain automotive antifreeze and coolant products. When ingested, it is metabolized in the liver by alcohol dehydrogenase, an enzyme that normally breaks down ethanol.

However, ethanol has a higher affinity for alcohol dehydrogenase than ethylene glycol. By administering ethanol as a treatment, it saturates the enzyme, effectively blocking the metabolism of ethylene glycol.

This competitive inhibition allows for the excretion of ethylene glycol through urine without its conversion into more toxic metabolites, such as glycolic acid and oxalic acid.

The presence of ethanol in the bloodstream ensures that alcohol dehydrogenase is primarily focused on metabolizing ethanol rather than ethylene glycol, reducing the toxic effects of ethylene glycol poisoning.

It's important to note that while ethanol can be used as a temporary treatment for ethylene glycol poisoning, it is not a definitive antidote. Prompt medical attention and appropriate medical treatments, such as dialysis and administration of fomepizole or 4-methylpyrazole, are essential for managing ethylene glycol poisoning effectively.

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Answer:

40

Explanation:

The total mass of calcium in the products is 40

The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

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The proposed solution, which has 10.0 grams of glucose in 100 gram of water, has a freezing point of 1.034 C.

The degree of heat in which a liquid becomes solid. precisely the temperatures at which a material's solid and liquid states are balanced at atmospheric pressure.

If a substance is kept below its freezing point, it may either become more or less dangerous. The freezing point additionally offers an essential safety standard for evaluating the impacts of occupational exposure to cold conditions.

m = molality

i = van 'toff factor,

molality = n/w*t of solvent

n = w*t of Glucose/M* w t

= 10/180*1/0.1

=0.555 w* t

= 1.86*0.555*1

= 1.034

T (solvent) - d= 0-1.034

freezing point = -1.034C

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Answer:

NH

3

acts as a Bronsted-Lower acid by giving its lone pair electrons.

Only in reaction 1 and 2 it acts as Bronsted-Lowry acid.

Explanation:

hope it's help you

Based on the data and calculations obtained, it can be concluded that the hypothesis stating, "If the density of the object is 19.32 g/ml, then the object is gold" is not supported.

To support this conclusion, the data and calculations regarding the density of the object should be analyzed. If the calculated density of the object differs significantly from the expected value of 19.32 g/ml, it indicates that the object is not gold.

The accuracy and precision of the data can be assessed by comparing the calculated density with the expected density value. If the calculated density is close to the expected value, it suggests high accuracy. Additionally, if multiple measurements of density yield consistent results, it indicates high precision.

Further experimentation could involve additional tests to determine the identity of the object. These tests could include assessing other physical or chemical properties such as melting point, electrical conductivity, or reactivity with certain substances.

Possible sources of error in the experiment could include instrumental errors in measuring the mass or volume of the object, contamination of the object, or inaccuracies in the known density of gold used for comparison. These factors could contribute to deviations between the calculated and expected densities.

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The molar mass of the unknown gas is approximately 31.27 g/mol.

To determine the molar mass of an unknown gas, use the ideal gas law equation:

PV = nRT

Where:

P = Pressure (in atm)

V = Volume (in liters)

n = Number of moles

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

T = Temperature (in Kelvin)

First,  need to convert the given values to the appropriate units:

Pressure (P) = 728 mmHg = 0.961 atm

Volume (V) = 102 ml = 0.102 L

Temperature (T) = 97°C = 370 K (converted to Kelvin)

Next,  rearrange the ideal gas law equation to solve for the number of moles (n):

n = PV / RT

Substituting the values:

n = (0.961 atm) * (0.102 L) / (0.0821 L·atm/(mol·K) * 370 K)

n = 0.01244 mol

Now , determine the molar mass (M) of the gas using the formula:

Molar Mass (M) = Mass (m) / Moles (n)

Given that the mass (m) of the gas is 0.389 g and the moles (n) calculated above is 0.01244 mol:

M = 0.389 g / 0.01244 mol

M ≈ 31.27 g/mol

Therefore, the molar mass of the unknown gas is approximately 31.27 g/mol.

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The Correct answer is 50 Meters,Displacement is defined to be the change in position of an object.

Displacement is the term used to describe the shift in an object's location or the shortest path/length between two places. With such a magnitude and orientation, it is a vector quantity.

Displacement=Δx=x f −x 0

The student's path fortunately consisted of straight lines and right angles. Therefore we can use the pythagorean theorem to find the distance between where the student's path started and stopped.

A2+B2= C2.

We Give

meters east in for A, 40.

meters north for B  60 .

Distance =40+60+20=110m

Displacement OC= Root of (40 ²+30 ²)

                            = 50 m

That's the length of the distance between where the student started and where the student ended up.

A2 plus B2 equals C2. We plug 30. meters east in for A, and 40. meters north for B. 30. meters squared plus 40. meters squared equals 2500 meters2. Then we take the square root of that number and get 50. meters.

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Answer:

V = 29.3 inch³

Explanation:

Given data:

Diameter of cone = 4 inch

Height of cone = 7 inch

Volume of cone = ?

Solution:

Formula:

V = πr²h/3

we calculate the radius from diameter,

r = 4 inch/2 = 2 inch

Volume:

V = 3.14 ×(2 inch)²  × 7 inch/3

V = 3.14 × 4 inch² × 7 inch/3

V = 29.3 inch³

Answer:

Scientists develop knowledge by making observation about the natural world that may lead to a scientific question.

A scientific question may lead to a(n) hypothesis which can be tested.

The results of experimentation can lead to changes in scientific knowledge.

Explanation:

In the process of developing scientific knowledge, scientists carry out series of observations on what happens in the natural world. This helps them to develop scientific questions. These scientific questions drawn can then lead to hypotheses which are testable.

The testing process leads to experimentation. It is in this process that much scientific questions receive answers. Testing actually lies at the core of scientific inquiry for all scientists. Whatever hypothesis made must always be tested.

The result of the testing or experimentation brings changes in scientific knowledge.  

Answer:

false

Explanation:

Answer:

False.

Explanation:

The sum of potential energy and the kinetic energy of an object is mechanical energy.

Hope that this helps!!! :)

Answer:

gas and element and compound

Explanation:

because it's different and more power so the elements

Answer ;

Your answer is C

Explanation:

There is the formation of intermolecular hydrogen bonding in ethanol as shown in the model below.

Intermolecular interactions can arise when ethanol, a common alcohol, is liquid. These interactions result from the ethanol molecule's polarity and hydrogen bonding propensity.

Two carbon atoms, five hydrogen atoms, and one oxygen atom make up the compound ethanol (C2H5OH). Because the oxygen atom is more electronegative than the carbon and hydrogen atoms, they are bound together by a polar covalent bond.

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Answer:

When a solid dissolves the solid (solute) and the liquid (solvent) form a very close intimate mixture called a solution. :)

(Brainliest?)

Explanation:

Answer:

Base

Explanation:

Why is Alka-Seltzer a base?

Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.

1.84 pressure (in atm) is applied by a segment of mercury 1.30 m high? the thickness of mercury is 13.5951 g/cm3.

Thickness of mercury= 13.5951 g/cm cubed, gravitational constant= 9.80665 m/s squared , 1 atm= 101,325 Pa= 760 torr mm Hg)

1.401000mm/1m1atm/760= 1.84

The ideal gas regulation, PV = nRT. In this equation, 'P' is the pressure in atmospheres, 'V' is the volume in liters, 'n' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas steady (0.0821 liter atmospheres per moles Kelvin).

The pressure of our segment liquid mercury is equivalent to the thickness of mercury, 13,595 kilograms for every meter cubed, times the speed increase because of gravity, 9.81 meters each second squared, times the level of the liquid mercury, 0.760 meters. At the point when we increase out these three values, we get a pressure of 101,358.88 pascals.

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Therefore, the mass of 9.03 x 10^23 atoms of S is approximately 48.11 g.

So, the answer is (B) 48.1 g S.

What is Molar Mass?

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is calculated by adding up the atomic masses of all the atoms in a molecule. Molar mass is a useful concept in chemistry because it allows chemists to convert between mass, moles, and number of particles.

To find the mass of 9.03 x 10^23 atoms of S, we first need to find the number of moles of S in 9.03 x 10^23 atoms:

1 mole of S contains 6.022 x 10^23 atoms of S (Avogadro's number).

So, the number of moles of S in 9.03 x 10^23 atoms of S is:

9.03 x 10^23 atoms / 6.022 x 10^23 atoms/mol = 1.50 mol

Next, we can use the molar mass of S to convert moles to grams:

1.50 mol x 32.07 g/mol = 48.11 g

Therefore, the mass of 9.03 x 10^23 atoms of S is approximately 48.11 g.

So, the answer is (B) 48.1 g S.

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Terrestrial planets are smaller, denser, and have rocky surfaces, while gas giants are larger, less dense, and have gaseous atmospheres.

Planetary orbits are elliptical, with the Sun at one focus. Planets revolve around the Sun in elliptical orbits.

Planets speed up as they move closer to the Sun and slow down as they move farther away from the Sun.

The cube of a planet's orbital radius is proportional to the square of its period.

Use Kepler's third law to predict a body's period given its orbital radius. Kepler's third law can be used to predict a body's period given its orbital radius.

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