Fe + O2 → Fe203
What should the coefficient for the diatomic oxygen
(O₂) be when this equation is correctly balanced?

The correct answer is (C) and (D). Both are chemical changes and both conserve mass.

The apple rots and turns into compost rotting over time. Due to the fact that the compost cannot be converted back into an apple core, this is an illustration of a chemical transition.

The sugar in the marshmallow can caramelize when it is heated over a flame; this chemical process gives the marshmallow its toasted flavor and brown hue.

When bonds between molecules or atoms are created, disrupted, or both, chemical changes result. This indicates the transformation of one substance with certain physical characteristics changes into another substance with distinct characteristics. Organic, inorganic, and biological changes are the three different types of chemical alterations.

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Answer:

a nucles

b electron cloud

Explanation:

The separation of the components of a mixture based upon the fact that each component has different set of physical and chemical properties.

These components are pure substances which can either be elements or the compounds. There are various factors for the separation of the components. These factors are state, melting and boiling point, solubility, magnetic nature etc.

Techniques such as chromatography, distillation, evaporation, and filtration are used for mixtures that can be separated through physical changes.

Physical changes do not affect or change the nature of the substance. It simply changes the form. Through chemical changes pure substances, such as compounds, can be separated.

Physical properties of the component can be physical state, magnetic and electrical properties, specific gravity, density, melting point, boiling point and solubility, etc.

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The density of the sample of glass with a mass of 37.4 g and a volume of 15.2 mL is - 2.460 g/ml.

The density of a body is defined as ratio of mass per unit volume. Mathematically -

ρ = M/V

M - mass of substance

ρ - density of substance.

V - volume of substance

Given is a sample of glass with a mass of 37.4 g and a volume of 15.2 mL.

From this, we can write -

Mass of glass [M] = 37.4 g

Volume of glass [V] = 15.2 ml

According to the question -

The ratio of mass per unit volume is -

ρ = M/V

Substitute the values of mass and volume, we get -

ρ = 37.4 / 15.2 ml = 2.460 g/cm³.

Hence, the density of the sample of glass with a mass of 37.4 g and a volume of 15.2 mL is - 2.460 g/ml.

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I believe that the wind power is more than they make it out to be. The most powerful and best is hydraulic and natural gas.

For exactly 200.00 ml NaCl solution the most appropriate tool would be volumetric flask because it gives the results in most precise way.

For a 0.02 ml acid solutions the most appropriate tool would be 1 ml pipette due to the reason of neutralization of alkali.

For approximately 400 ml of H20 the most appropriate tool would be beaker because we may need stirring the H2O in any experiment.

For exactly 77.5 ml methanol the most appropriate tool would be graduated cylinder we need a measuring cup during the experiment.

In conclusion the answer would be volumetric flask,  1 ml pipette, beaker, graduated cylinder.

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Answer: For exactly 200.00 ml NaCl solution the most appropriate tool would be volumetric flask because it gives the results in most precise way.

For a 0.02 ml acid solutions the most appropriate tool would be 1 ml pipette due to the reason of neutralization of alkali.

For approximately 400 ml of H20 the most appropriate tool would be beaker because we may need stirring the H2O in any experiment.

For exactly 77.5 ml methanol the most appropriate tool would be graduated cylinder we need a measuring cup during the experiment.

In conclusion the answer would be volumetric flask,  1 ml pipette, beaker, graduated cylinder.

Explanation:

The yellowish-green powder is a compound because two elements (iron and bromine) chemically combined to form it.

A compound in chemistry is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

This means that a compound is formed by the chemical bonding of two or more elements.

According to this question, a grey-coloured iron powder was heated in reddish-brown bromine vapour to form a yellowish-green powder.

The grey-coloured iron is an element that combined with the reddish-brown bromine gas. This suggests that two elements combined. It can be said to be a chemical reaction because a colour change was observed.

Therefore, the yellowish-green powder is a compound because two elements (iron and bromine) chemically combined to form it.

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Answer:

118.5 grams

Explanation:

150*0.79 because there are 0.79 grams in a milliliter and we need to find out how many are in 150 milliliters

Stanley miller's spark - discharge experiment demonstrated simple molecules can react to form Organic molecules under the conditions of earth's early atmosphere.

The Stanley miller in 1953, performed a experiment to describe the origin of life on earth. The mixture of methane , water, hydrogen and ammonia , which were found in early earth's atmosphere. these mixture were sealed in inside a test tubes. and flasks connected together in a loop. one flask is half filled with water and another one contains electrode. gases were circulated around apparatus imitating the earth's atmosphere.

The electrodes were used to spark fire to imitate light and storm through vapor. vapours were cooled and come back to first flask in continuous cycle. After a week he found  amino acid and other organic compounds as a result of this experiment.

Hence, Stanley miller's spark - discharge experiment demonstrated simple molecules can react to form Organic molecules under the conditions of earth's early atmosphere.

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2.48 g of sodium are in it

Chemical element of the alkali metal group Group 1 A of the periodic table and sodium is a very soft silvery-white metal and sodium is the most common alkali metal and the sixth most abundant element on Earth

Here given data is  package of chocolate instant pudding = 2840 mg of sodium then in order to determine the amount of sodium in grams, we will follow the unit conversion method which is given below so, thus, the amount of sodium present in the chocolate instant pudding in grams is 2.48g

2840mg→g

1000mg/g = 2.48g sodium are in it

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Answer:

Water as a Compound and Molecule

A compound forms whenever two or more atoms form chemical bonds with each other. The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms. Thus, water is a compound

They only differ in that a 24Mg atom has 12, a 25Mg atom has 13, and a 26Mg atom has 14 neutrons in its nucleus.

Neutrons are defined as a proton-sized subatomic particle with no electric charge that is present in all atomic nuclei with the exception of those of regular hydrogen. Hydrogen is the sole exception, as it has a single proton in its nucleus. Compared to positively charged protons, neutrons have a little higher mass and a neutral electric charge.

Magnesium (Mg). Diagram of the magnesium-24 atom, the most prevalent isotope of this element, showing its nuclear structure and electron configuration. 12 protons (red) and 12 neutrons make up the nucleus (blue). When neutral, magnesium-26 contains 12 protons and 12 electrons.

Thus, they only differ in that a 24Mg atom has 12, a 25Mg atom has 13, and a 26Mg atom has 14 neutrons in its nucleus.

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A polymer mixture p that has number-average and weight-average molecular weights of 120,000 and 300,000 and then Number average molecular weight is 110,000 g/mol

a) The number average molecular weight (NAM) is calculate using the mole numbers of each component. In this case, we will multiple each component molecular weight by the number of moles of each one. After that we will sum them and finally to divide by the total number of moles.

NAM = (Na*MA + Nb*MB)/(Nt)

NAM = (1 mol *120000 g/mol + 1*100000 g/mol ) /(2 mol)

NAM = 110000 g/mol

The number average molecular weight for the polymer P is 110,000 g/mol

We have a polymer P made up of two monodisperse fractions.

A with molecular weight of MA = 120000 g/mol and B with MB =100000 g/mol.  

The batch contains an equal mole fraction of each component A and B.  

Let's suppose a total number (Nt) of mols 2 moles. Equal fraction means XA = 0.5 and XB =0.5

Nt = 2 mol

Na = 2*0.5 = 1 mol

Nb = 2*0.5 = 1 mol.

So, we have 1 mol of A, 1 mol of B and 2 moles in total.  

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Answer:

The answer is salty water

Explanation:

Hope this helps :)

Answer: Sulfuric acid

Explanation: Sulfuric acid is a colorless oily liquid. It is soluble in water with release of heat. It is corrosive to metals and tissue.

Answer:

(1) 5.2 × 10^3 in standard form is 5200

(2) 9.65 × 10^-4 in standard form is 0.000965

(3) 8.5 × 10^-2 in standard form is 0.085

Explanation:

(1) The exponent is 3, making it 10 to the power of 3. As the exponent is positive, the solution is a number greater than the origin or base number. To find our answer, we move the decimal to the right 3 time(s), giving you 5200 as your answer in standard form.

(2) The exponent is -4, making it 10 to the power of negative 4. When an exponent is negative, the solution is a number less than the origin or base number. To find our answer, we move the decimal to the left 4 times, giving you 0.000965 as your answer in standard form.

(3) The exponent is -2, making it 10 to the power of negative 2. When an exponent is negative, the solution is a number less than the origin or base number. To find our answer, we move the decimal to the left 2 times, giving you 0.085 as your answer in standard form.

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Answer:

they spread out waiting until each orbital has one electron before doubling up (the last bullet point)

Explanation:

This is because electrons are negatively charged so if they doubled up together in the begging, they would repel each other.  

The density of silver at room temperature is 10.49 g/cm3, and the density of silver at its melting point is 9.3 g/cm3 when solid silver melts, its particles 'move farther apart'

From the given data density of silver at room temperature is 10.49 g/cm3, and the density of silver at its melting point is 9.3 g/cm3 then solid melts, liquid state is obtained and intermolecular distance in liquid is more than the intermolecular distance in solid due to this, the strength of intermolecular forces of attraction decreases when silver solid melt then its particles move farther apart and that's why the solid silver which is at room temperature density is more because it is in room temperature but we melt then particles are move faster and move apart from other and density become less.

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Answer:

B. The rate of mitosis is much greater than the rate of apoptosis

Motion is the act of shifting one's position.

The physics term for a body's position or orientation changing over time. Translation is the movement along a straight or curved path.. Rotation is a motion that modifies a body's orientation.

According to the information provided,

a body is said to be in motion if its position varies over time. Speed, velocity, distance traveled, displacement, acceleration, and time may all be quantitatively described.

Physics' discipline of kinematics discusses a body's motion without mentioning its cause, while dynamics examines forces as well as how they affect motion.

When it is discovered that an object is not altering its location with respect to a certain frame of reference, it is said to be at rest. Another word for the condition of rest is stationary.

Thus, we could draw the conclusion that motion is the process by which an object's location changes over time.

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Answer:

The correct option is;

a. The particles will gain a large amount of kinetic energy

Explanation:

As the water temperature reaches 100°C, which is the boiling point for water at atmospheric pressure, the continued heating is then used to break up the strong inter molecular forces between molecules of the water  such that the individual molecules are free to move about and due to the high temperature, have gained considerable amount of kinetic energy for the to rise to appreciable height and to also spread.

The heat which converts water into steam is called latent heat as during the boiling phase, the temperature of the water remains constant.

The molar volume of gas is 20.48 liter/mol.

We need to know about molar volume to solve this problem. The molar volume is defined as how much volume is in one mole of the substance. It can be calculated by this equation

Vm = V / n

where Vm is molar volume, V is the volume of the substance and n is the total amount of substance in moles.

From the question above, the given parameters are

n = 5.47 moles

V = 112 L

By substituting the given parameter, we can calculate the molar volume

Vm = V / n

Vm = 112 / 5.47

Vm = 20.48 L/mol

Hence, the molar volume of gas is 20.48 liter/mol.

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If a sample of He gas and O₂ have the same temperature, pressure, and volume then He gas will have more collisions.

This is because the He gas has less molecular mass then the oxygen gas and hence it can move more easily than oxygen thus will collide more with the walls of the container while being on the same temperature, pressure and volume as the oxygen gas. because of its low molecular mass it moves with the high average velocity than the oxygen gas and hence  the rate of its collision with the walls of the container ins more.

Thus the He gas will have more number of collisions then the Oxygen gas while having same temperature, pressure and volume.

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The existence of distinct states of matter is explained by variations in kinetic energy. Because matter particles are attracted to one another, they tend to group together. Only if the particles possess sufficient kinetic energy to overcome this force of attraction can they move apart.

It can be explained as follows:

So, the kinetic energy is decidable factor in the occurrence of matter in a particular state.

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Yes, formation of phosgene from carbon monoxide and diatomic chlorine is an elementary reaction. A one-step reaction kind that is referred to as an elementary reaction. And this kind of reaction occurs in a single step.

The coefficients of all the reactants in the balanced equation can also be used to get the rate law for an elementary reaction.

For example, to be seen as the rate = k[A]2[B] is the rate rule for the elementary reaction 2A + B products.

The simplest kind of reaction is an elementary reaction that takes place in just one step.

The molecularity of an elementary reaction—a measure of how many molecules of reactants is involved—is typically used to categories them.

Elementary reactions are also well-defined chemical processes that happens only when two or in rarely three molecules or ions that collide.

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The volume of a gas that initial occupies 1.56 L at 101.3 KPa is 3.47L.

The volume of a gas at a given pressure can be calculated using Boyle's law equation as follows:

P1V1 = P2V2

Where;

According to this question, a gas occupies 1.56 L at 101.3 kpa, the volume of this gas if the pressure becomes 45.5kpa can be calculated as follows:

101.3 × 1.56 = 45.5 × V2

158.028 = 45.5V2

V2 = 3.47L

Therefore, the volume of a gas that initial occupies 1.56 L at 101.3 KPa is 3.47L.

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Water molecules that surround a less polar molecule in solution are immobile and ordered.

Water is good at dissolving ions and polar molecules, but it is poor at dissolving non-polar molecules. Water makes an excellent solvent because of its polarity and ability to form the hydrogen ions.

Polar molecules have the electric charges which are unequally distributed. Water forms the electrostatic interactions which are charge-based attractions with the other polar molecules and ions, due to its polarity.

Hydrogen carries a partial positive charge and oxygen with partial negative charge. Oxygen having partial negative charge  and hydrogen having partial positive charge results in the polarity of the molecule.

The less polar molecules and ions interact with the water, the partially positive and partially negative ends of water. The positive charges attracts negative charges, thus leading it to be immobile and ordered.

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According to the linear model of mass communication, an advertisement for cereal is an example of a message.

The process of developing, sending, receiving, and analyzing messages for large audiences through spoken and written media is known as mass communication (or communications). It is a broad field that takes into account both the means by which a communication is created and its intended audience. These media span a variety of platforms and include print, social media, digital and Internet media, radio, and television. Strategic communication, health communication, political communication, integrated marketing communications, journalism, and other related professions are all included in the multidisciplinary aspect of mass communication.

There are various bachelor's and master's in mass communication programs provided by colleges and universities across the country for those who are interested in working in public communication or studying it as a topic of study.

The development, dissemination, and evaluation of effective communications aimed at sizable audiences is the domain of mass communication specialists who are knowledgeable in rhetorical principles and strategic media tactics.

Every day, mass communication strategies are used by public relations specialists, journalists, broadcast professionals, advertisers and marketers, content writers, graphic designers and illustrators, public health educators, corporate media managers, and other media professionals to create and implement strategic communication plans — from broadcast news to online marketing campaigns and public health announcements — across almost every industry.

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Answer:d

Explanation:

By ideal gas approximation, the molecular weight of the polymer sample is 861471.83 gram.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (0.0821 atm.L/mol.K) and T is temperature.

From the question above, we know that

ρ = 25 g/L

P = 0.54 torr = 0.00071 atm

T = 25⁰ C = 298 K

We can change the number of moles to density form

P . V = n . R . T

P . V = gr/Mr . R . T

Mr = ρ  . R . T / P

Mr = 25 . 0.0821 . 298 / 0.00071

Mr = 861471.83 gram

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