Express the number in
standard notation or
standard form.
1.25 x 10²
Standard Form

To determine the density of a living body, divide the body mass by the volume of the body.

"Density is the mass per unit volume". It is a scalar quantity. It is referred to by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.

To calculate the density of a living body. Just calculate the mass of the body and the total volume of the body and divide these entities. Humans have a density approx to 1000 kg/m3

The formula is

d = m / v

Thus, to calculate density,  the body mass is divided by the body's volume.

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The number of tires contained by 2.5 moles of cars is 10 tires.

The number of moles of a substance equals the ratio of its given mass in a chemical reaction to the mass of one mole of that substance.

The number of tires contained by 2.5 moles of cars is calculated as follows;

1 moles of a car contains 4 tires

2.5 moles of cars will contain -------?

Substitute the given parameters and solve for the number of tires contained in 2.5 moles of cars.

= 2.5 moles x 4 tires/1 mole

= 10 tires

Thus, the number of tires contained by 2.5 moles of cars is 10 tires.

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Protons and neutrons make up the majority of an atom's mass because electrons have almost negligible mass. Consequently, an atom's mass in atomic mass units is determined by the sum of its protons and neutrons.

An element's mass number is determined by the sum of its proton and neutron counts: Protons and neutrons together make up mass. Simply deduct the number of protons, or atomic number, from the mass number to get how many neutrons each atom has.

This becomes significant when there is a mass number. It enables us to distinguish between elements known as isotopes that have differing numbers of neutrons.

Although protons and neutrons are similar in size, they are both significantly heavier than electrons (approximately 2,000 times as massive as an electron). A proton's positive charge is equivalent to an electron's negative charge in strength.

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Question: ) ✨ Illustrate the structural and functional difference between glucose and fructose?

Answer: We know that Glucose is six membered ring, while fructose is a five-membered ring. Both rings contain an oxygen atom.Glucose and fructose are structural isomers: have the same chemical formula but have different arrangement of atoms. While glucose has aldose sugar- carbonyl group at the end of the chain, fructose has ketose sugar- carbonyl group in an internal of the chain (specifically, at the second carbon.

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Explanation:

Answer:

sugar is hygroscopic

Explanation:

sugar is hygroscopic

Answer:0.0303495251

Explanation:

I know the answer looks weird.

If the answer is wrong then the formula for density is mass divided by volume.

Answer: $582.47

Explanation:

Convert $4.64 per lb to $ per gallon. That would equal around $37.10. Multiply that by 15.70 gallons of strawberries and you'll get $587.47.

15.70 gallons of strawberries would cost approximately $365.40.

To determine the cost of 15.70 gallons of strawberries, we need to convert the volume from gallons to pounds and then multiply by the cost per pound.

First, we need to know the conversion factor between gallons and pounds for strawberries. This conversion factor depends on the density or specific gravity of strawberries, which can vary. Without this information, it is not possible to accurately convert gallons to pounds.

If we assume an average conversion factor of 1 gallon of strawberries weighing approximately 5 pounds, we can estimate the cost. However, please note that this is an approximation and the actual weight of strawberries per gallon may vary.

15.70 gallons * 5 pounds/gallon * $4.64/pound = $365.40

Therefore, based on the approximation, 15.70 gallons of strawberries would cost approximately $365.40.

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A substance's temperature in physics' laws, is directly related to the average kinetic energy of its particles. Because the particles' mass is constant, they must travel faster as the temperature rises.

In physics, the kinetic energy of an object is the energy it possesses as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a given speed.

The body retains its kinetic energy, having acquired it during acceleration, until its speed changes.

Kinetic energy is present in an accelerating ball, a walking human, and electromagnetic radiation like light. Another type of kinetic energy is the energy associated with the continuous, random bouncing of atoms or molecules.

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Answer:

Simple staining provides the contrast between the bacteria and the surroundings.

Explanation:

Over staining the bacterial smear may cause the cell wall disruption or totally destroy the cell wall which results in the loss of true morphological characteristics of the bacterial cell

The volume of the alloy of gold and silver having density of 13.1 g/cm³ and mass 4.80 g is 0.367 cm³.

We have an alloy of gold and silver.

We have to calculate the volume of a 4.80 g sample of the alloy.

The ratio of mass to density is equal to volume of a substance. Mathematically -

M/ρ = V

ρ - density of substance.

M - mass of substance

V - volume of substance

According to the question -

The ratio of mass to density is -

V = M / ρ

Substitute the values -

V = 4.80 / 13.1 = 0.367 cm³.

Hence, the volume of the alloy of gold and silver is 0.367 cm³.

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The given statement is false ~

As we know, large distances can only be measured by using larger units like kilometers, miles, or other units, and it's much convenient. so, it's so different if we were to measure that distance using small unit like " decimeters "

I hope that was reasonable for you to understand, let me know if you have any questions ~

Answer: Uranus and neptune

Explanation:

Answer:

a change in physical property

The lithium cation is smaller than lithium atom .

The lithium atom's electronic configuration is as follows:

Li = 1s², 2s

While the following describes the electronic structure of the lithium cation,

Li⁺ = 1s

Some of the reasons why lithium cation is shorter than the corresponding parent atom .

The Li atom's valence shell is shown in electronic configurations as being two whereas the Li cation's is one; as a result, the distance between the valence electrons and nucleus has shrunk, resulting in small size.

Shielding effect refers to the way the core electrons protect the valence electron from nucleus pull. Since there are no core electrons in a cation of lithium, the electrons are more drawn to the proton, which causes the cation to be tiny.

Three protons and three electrons make up the Li atom; as a result, three protons will pull three electrons, making the game somewhat balanced. However, once one electron leaves the Li cation, the proton side becomes stronger and exerts more force on the remaining electrons, bringing them closer to the nucleus and shrinking their size.

In this way, a lithium cation became shorter than its corresponding parent atom.

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A chemical reaction does occur when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined.

The correct answer choice to the above is option a.

This means that when an aqueous solutions of lead(II) nitrate and nickel II chloride are combined, it gives lead II chloride and nickel trixonitrate IV

The net ionic equation is given below:

Pb(NO3)2 + NiCl2 ----- PbCl2 + Ni(NO3)2

Pb2+ NO3- + Ni2+Cl- ----- Pb2+ Cl- + Ni2+ NO3-

Chemical reactions are those reactions whereby substances combine together to form other substances. The substances which combine together are called the reactants while the new substance formed is known as product.

So therefore, a chemical reaction does occur when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined.

Complete question:

Does a reaction occur when aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined?

a. yes

b. no

If a reaction does occur, write the net ionic equation.

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If,105.5mg sample of a white substance, suspected of being cocaine (C17H21NO4), forms 279.3mg of CO2 and 66.46mg of water on combustion, then we can conclude that the white solid is cocaine.

1. Pure Cocaine :

The product is often passes with the help of the supply chain.

2.Crack Cocaine :

3. Synthetic Cocaine :

4.Black Cocaine :

A combustion reaction is a type of chemical reaction in which generally a fuel undergoes an oxidation by the reaction with the help of an oxidizing agent, which ,results in release of energy.  

Thus from the above conclusion we can say that, If,105.5mg sample of a white substance, suspected of being cocaine (C17H21NO4), forms 279.3mg of CO2 and 66.46mg of water on combustion, then we can conclude that the white solid is cocaine.

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Answer: its A

Explanation: Graphic notation (or graphic score) is the representation of music through the use of visual symbols outside the realm of traditional music notation. Graphic notation became popular in the 1950s and can be used either in combination with or instead of traditional music notation.

The electron dot structure for H2O shows that the O has 2 lone pairs of electrons. So the answer would be 4 non bonding electrons are in a water molecule.

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The Pressure of gas in the bulb = 1392.70 atm

1) The barometric pressure is also called atmospheric pressure as it is the pressure with in the earth.

2) The given  values are

The barometric pressure =  766 Torr = 1.00789 atm (convert the value of torr into the standard pressure that is atm)

The height of Barometer (in mercury)= 141 mmHg

Pressure of a gas in bulb = need to find out.

The formulae used is

P=ρ×g×h, where:

P = pressure of gas (unknown )

g = acceleration due to gravity = 9.8m/s²

h = Hight of the liquid

By substituting all the values in above equation,

P = 1.00789×9.8× 141

P = 1392.70 atm

so the The barometer whose barometric pressure is 1392.70 atm  atm exerted by the mercury and the height of the liquid is 141 mmHg.

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The middle element in a specific group of similar elements act as an intermediate between the other two because it is close to the average of the other two elements and is denoted as option C.

These are the substances which aren't unable to be broken down by a chemical reaction and comprises of subatomic particles such as electron, proton etc.

The middle element in a specific group of similar elements act as an intermediate between the other two because it is close to the average of the other two elements when arranging the elements in order of their atomic masses.

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Yes. The melting point of a substance can be used as a criterion of its purity.

The melting point of a solid substance is the temperature at which the molecules of the solid melt to become liquid.

The melting point of a solid substance can be used as a criterion to judge how pure the substance is.

Pure solids have sharp or narrow melting points. On the other hand, impure solids melt over a wide range of temperatures, as high as 5 degrees Celsius.

The presence of impurity also lowers the melting point of substances. For example,  pure sugar melts at 186 degrees Celsium while sugar with impurity will melt at lower temperatures but over a wide range.

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The period of the pendulum is defined as  time it takes the pendulum to make one full back-and-forth swing

The pendulum is a device that could be used to demonstrate oscillatory motion. We know that the pendulum has a long string that is fastened to a support. The bulb is displaced at a small angle and the period is the time that is taken to complete the cycle.

The kind of motion that is undergone by a pendulum is what we define as the oscillatory motion. It is a regular repeating motion and the acceleration is directed always towards the center of the motion.

We can tell that the pendulum swings from one side to the other and we could use the stop clock to measure the movement of the pendulum. Thus it follows that the period of the pendulum is defined as  time it takes the pendulum to make one full back-and-forth swing.

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Answer:

3.974 x 10¹³ mg

Explanation:

To find the amount in milligrams (mg), you need to multiply the given number by the conversion, 1,000 mg/g. This conversions exists as a ratio which compares the amount of mg per every 1 g. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator).

1,000 mg = 1 g

3.974 x 10¹⁰ g            1,000 mg
-----------------------  x  -------------------  =  3.974 x 10¹³ mg

                                       1 g

The characteristic property of the substances in the solutions does thin-layer chromatography utilize is molecular polarity. The correct option is A.

Thin layer chromatography s used to separate the molecules on the basis of their polarity. It is done on a thin sheet of aluminum foil or glass or plastic in which the molecules are poured, and then it is covered by a sheet of material.

When solvents travel through the sheet, the molecules travel at different speeds or paces.

Thus, the correct option is A, molecular polarity.

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a. 2C₄H₁₀(g) + 13O₂(g) → 8CO₂(g) + 10H₂O(g)  

The coefficient of CO2 in the above equation is 8.

b. 2Cr(s) + 3H₂SO₄(aq) → Cr₂(SO₄)₃(aq) + 3H₂(g)

c.  Cl₂O₇(g) + Ca(OH)₂(aq) → Ca(ClO₄)₂(aq) + H₂O(l)

this equation is already balanced

d. PBr₃(l) + 3H₂O(l) → H₃PO₃(aq) + 3HBr(g)

e. (NH₄)₂CO₃ + CaSO₄→ (NH₄)₂SO₄ + CaCO₃

this equation is already balanced

f. K₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2KCl(aq)

g.  C(s) + 3Fe₂O₃(l) → 2Fe(l) + 3CO(g)

h. 2HCl(aq) + FeS(s) → FeCl₂(aq) + H₂S(g)

A chemical formula describes the changes that occur during a chemical reaction. It has the general form: reactant → product. All chemical formulas must be balanced. This means that there must be an equal number of each type of atom on each side of the arrow. A factor of is used to balance the chemical formula.

A coefficient is a numerical value that precedes a chemical symbol or formula. This indicates that a number of atoms or molecules of matter are involved in the reaction.

To balance a chemical formula, prefix the symbol or formula with the necessary coefficients so that the same number of each type of atom occurs in both reactants and products.

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Answer:

c

Explanation:

it is the amount if energy required to move the temoreture of a substance by one 1 Celsius degree

The energy needed to change the temperature of a substance. Option C is correct.

Specific heat capacity is a physical property of a substance that represents the amount of energy required to change the temperature of a unit mass (usually 1 gram) of the substance by one degree Celsius or one Kelvin. It is expressed in units of joules per gram per degree Celsius (J/g°C) or joules per gram per Kelvin (J/g K).

Specific heat capacity is essential in understanding how different substances respond to changes in temperature. Substances with higher specific heat capacities require more energy to increase their temperature, and conversely, they release more energy when their temperature decreases. This property also determines how well a substance can store or release thermal energy.

The formula to calculate the heat absorbed or released by a substance during a temperature change is Q = mcΔT, where Q is the heat energy absorbed or released, m is the mass of the substance in grams, c is the specific heat capacity of the substance in J/g°C or J/g K, and ΔT is the change in temperature in degrees Celsius or Kelvin.

For example, water has a relatively high specific heat capacity (4.18 J/g°C), meaning it can absorb or release a significant amount of energy without experiencing a significant temperature change. This property is why water helps to regulate temperature in natural environments, and it makes water an excellent coolant and heat reservoir in various industrial and biological processes.

In summary, specific heat capacity is a crucial factor in understanding how substances respond to changes in temperature and how they store and release thermal energy. It plays a significant role in various fields, including chemistry, physics, and engineering.

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The density of the baby oil, ρ = 0.833 g/ml.

density = mass / volume

ρ = m / V

where,

ρ is density

m is mass

V is volume

So putting the values in the formula,

ρ = 10g / 12ml

ρ = 0.833 g/ml

The three most fundamental characteristics of an object are mass, volume, and density. Volume indicates something's size, mass indicates how heavy it is, and density is calculated as mass divided by volume. Although you deal with mass and volume on a daily basis, the concept of density is less clear-cut and requires careful consideration.

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Taking into account the definition of density, the density of the star is 1,587,553.58 g/cm³.

Density is defined as the  quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

density= 2×10³⁹ g÷ 1.2598×10³³ cm³

Solving:

density= 1,587,553.58 g/cm³

In summary, the density of the star is 1,587,553.58 g/cm³

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