Chemical Bonding : The molecules are usually categorized into two categories depending on the bonding and the bonding are classified into ionic bonds and covalent bonds.
Other comes under wander vall interactions.
If the molecular atoms are not hydrogen atoms then it must shares polar covalent bond , it is defined as the distribution of electrons unequally (that means one have partial charges considered both positive and negative.
The main reason behind the distribution of electrons in any atom is the electronegativity. It determines the distribution of of the shared electrons in the middle of two atoms in a polar covalent bonding.
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The best scientific theories not only explain and organize known facts but also
O a. generate new predictions.
O b. use historical perspectives.
O c. establish new facts.
O d. discredit other theories.
The best scientific theories not only explain and organize known facts but also (a) generate new prediction.
A scientific theory is made by performing various experiments to verify the observation made. A scientific theory is made by observing something, making hypothesis and testing that hypothesis using experiments and then coming to a conclusion. If the hypothesis made is proved wrong then a new hypothesis is made. And the process is repeated again.
A theory that is accepted now can be proved wrong in the near future. Or one can say that theory not necessarily be applicable in every situation.
The hypothesis that are made are nothing but generation of new predictions.
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Polyacrylamide is a water-soluble polymer whose aqueous solution containing 25 g/l develops an osmotic pressure of 0. 54 torr at 25◦c. Find the approximate molecular weight of the polymer sample.
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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Solve the following Scientific Notation Questions:
1) Express the following in standard form:
a) 5.2 x 10^3
b) 9.65x10^-4
c) 8.5x10^-2
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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Which of the following is a homogeneous mixture? a) Ice cubes in soda c) Sandy water b) Vinegar d) Silver
Answer:
The answer is salty water
Explanation:
Hope this helps :)
the mass of an empty beaker is 4.995 g. using a pipet, 2.00 ml of an unknown acid solution is added to the beaker. the combined mass of the beaker and acid is 9.893 g. calculate the density of the acid solution.
The answer would be for this question is density = 1.95 g ml^-1.
Density is defined as the mass upon volume.
It is denoted by D.
Its unit is g/cm^3.
According to question,
Given,
Mass of an empty beaker = 4.995 g
Mass of unknown acid solution = 2.00 ml
Total or combined mass of the beaker = 9.893 g
To find density of the acid solution.
Calculation -
As you know the mass of empty beaker also the mass of the beaker increases after adding acid solution so,
Mass = 9.893 g - 4.995 g = 4.898 g
As the mass of an acid already mentioned only you need to get the value of the volume,
1 ml * 4.898 g / 2.0 ml = 2.449 g
Now the density of the acid solution is 1.95 g ml^-1.
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Your job is to design a mixer to produce 200 kg/day of battery acid. The mixer will operate continuously and at steady state. The battery acid product must contain 18. 6 wt% h2so4 in water. Raw materials available include a concentrated sulfuric acid solution at 77 wt% h2so4 in water, and pure water. What is the flow rate of each raw material into the mixer?
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.
Grey-coloured iron powder was heated in reddish-brown bromine vapour. A yellowish-green powder was formed. State if the yellowish-green powder is an element, a compound or a mixture. Explain your answer.
The yellowish-green powder is a compound because two elements (iron and bromine) chemically combined to form it.
What is a compound?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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Jill is doing an experiment on the movement of pill bugs. She will place the pill bugs on flat surfaces covered with different materials to see how the texture of each material affects the bugs' movement.
Answer: BRO ONLY 5 POINTS RU MAD?
Explanation: FRGG G TRHGTHTFRH FHTYHRDSHYRSYH
What do these two changes have in common?
compost rotting
cellular respiration
Select all that apply.
Both are changes of state.
Both are caused by heating.
Both are chemical change
Both conserve mass.
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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When a metal was exposed to photons at a frequency of 1.34×1015 s−1,
electrons were emitted with a maximum kinetic energy of 3.60×10−19 J.
Calculate the work function, Φ,
of this metal.
Φ=
J/photon
What is the maximum number of electrons that could be ejected from this metal by a burst of photons (at some other frequency) with a total energy of 3.67×10−7 J?
number of electrons:
The work function of the metal is 5.2 * 10^-19 J while the number of electrons is 2.3 * 10^12 electrons.
What is the work function?From the photoelectric theory of Einstein, electrons are emitted when light of appropriate wavelength is incident on a clean metal surface. The minimum energy that the incident light must possess is called the work function of the metal.
We know that;
Kinetic energy = Energy of incident photon - Work function
Energy of incident photon = hf = 6.6 * 10^-34 Js * 1.34×10^15 s−1
= 8.8 * 10^-19 J
Work function = Energy of incident photon - Kinetic energy
Work function = 8.8 * 10^-19 J - 3.60×10^−19 J
Work function = 5.2 * 10^-19 J
Now;
The total energy = 3.67×10−7 J
Hence;
3.67×10−7 J = n * 1.6 * 10^-19 J
n = 3.67×10−7 J/1.6 * 10^-19 J
n = 2.3 * 10^12 electrons
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A sample of he gas and o2 have the same temperature, pressure, and volume. Which gas has a greater number of collisions of gas molecules with the walls of the container?.
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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1. What is the density and probable identity of a sample of glass with a mass of 37.4 g and a volume of 15.2 mL?
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.
Define density in terms of mass and volume ?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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The separation of the components of a mixture is based upon the fact that each component has different.
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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In normal tissue, the
A rate of mitosis is equal to the rate of apoptosis
B rate of mitosis is much greater than the rate of apoptosis
C rate of mitosis is less than the rate of apoptosis
D rate of mitosis and apoptosis will be zero
Please i need answr rn
Answer:
B. The rate of mitosis is much greater than the rate of apoptosis
The process of changing position is
Motion is the act of shifting one's position.
By motion, what do you mean?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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Another classmate argues that wind power merits more investment and development, and cites data in Figure 2 as evidence. Evaluate this argument. Do you agree with the classmate? What additional evidence would help strengthen your position?
PLEASE HELP!!!!!!!!!!!!!!!!
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.
When sodium (Na) is mixed with water, an explosion takes place. Based on its location on the periodic table, how will potassium (K) behave with water?PLS HELP ME
a) Potassium is in the same period as sodium and shares similar properties so it will explode.
b) Potassium has the same number of valence electrons as sodium so it will explode in water.
c). Potassium is a non metal but sodium is a metal so potassium will not explode.
d) Potassium is in the same group as sodium so it does not share similar chemical properties and it will not explode.
Answer:d
Explanation:
Which option describes the particles of water as the liquid water actively boils?
(1 point)
Responses
The particles will have the same average kinetic energy and the same temperature during boiling.
The particles will lose kinetic energy and increase temperature during boiling.
The particles will have the same average kinetic energy and a decrease in temperature during boiling.
The particles will lose kinetic energy and decrease temperature during boiling.
2.
What does temperature measure? (1 point)
Responses
the empty space between the particles
the average kinetic energy of the particles
the heat of the particles
the total energy of the particles
3.
Which is the best interpretation of the two flat portions of the graph?
(1 point)
Responses
These show where kinetic energy is increasing.
These show where changes of state are occurring.
These show where temperature is 0ºC.
These show where thermal energy does not exist.
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.
is the formation of phosgene from carbon monoxide and diatomic chlorine an elementary reaction? that is, does it occur in a single step? explain your answer.
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.
Elementary reactionThe 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.
What does a chemical fundamental reaction entail?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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According to the linear model of mass communication, an advertisement for cereal is an example of a:______
According to the linear model of mass communication, an advertisement for cereal is an example of a message.
What do you mean by mass communication?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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Water is an example of a(n)
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
truction
Check
A
Active
Identifying Parts of an Atom
B
Identify the parts of the atom that are labeled in the
diagram.
Label A:
Label B:
science
Answer:
a nucles
b electron cloud
Explanation:
Stanley miller’s spark-discharge experiment demonstrated simple molecules can react to form _____ under the conditions of earth’s early atmosphere.
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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Describe the relationship between the kinetic energy of particles and states of matter.
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:
Matter exists as a solid if particles lack the kinetic energy to dissipate the force of attraction between them. The particles are held securely in place and are tightly packed together. They are only able to vibrate. This explains why the volume and shape of solids are fixed.Matter exists as a liquid if particles have enough kinetic energy to partially overcome the force of attraction between them. While the particles can slide past one another, they cannot totally separate. This explains why liquids have a constant volume but can change shape.Matter exists as a gas if particles possess sufficient kinetic energy to totally overcome the force of attraction between them. The granules may separate and disperse. This clarifies why.So, the kinetic energy is decidable factor in the occurrence of matter in a particular state.
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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. What does this information indicate about the differences between solid silver and liquid silver? PLS HELP ME
a)The particles in solid silver have more mass than those in liquid silver.
b)When solid silver melts, its particles move farther apart.
c)The particles in solid silver have more energy than those in liquid silver.
d)When solid silver melts, some of its particles evaporate.
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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Thanks for you help:)
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.
What was the mass of the ethanol plus the graduated cylinder when 20.0 ml of ethanol was added? choose the closest answer.
The mass of the ethanol + graduated cylinder would be 90.33 g.
Density of 20 ml ethanol is = 0.789 g/ml
As we know that density = mass UPON volume
so mass = density * volume
mass = 0.789 g/ml * 20 ml
mass = 15.78 g
If we try to get the volume of water in the experiment it will be 8.9 ml
Mass of graduated cylinder = 29.13 g
Mass of cylinder and mass = 36.33 g
If we combine all the masses we'll get 90.33 g.
Hence, the answer is 90.33 g.
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HELP ASAP PLEASEEEEEEEEE!
The respective atomic number, mass number, protons, electrons and neutrons of the following atoms are as follows:
Na - 11, 23, 11, 11, 12S - 16, 32, 16, 16, 16Ag (silver) - 47, 108, 47, 47, 61Au (gold) - 79, 197, 79, 79, 118What is atomic number?The atomic number of an element is the number of protons in the atom of that element. In a neutral atom, the number of protons is same as the number of electrons.
However, the mass number is the sum of the number of protons and neutrons in the atom.
This means that we can get the number of neutrons in an atom of an element by subtracting the number of protons/atomic number from the mass number.
Therefore, based on the above explanation, the respective atomic number, mass number, protons, electrons and neutrons of the following atoms are as follows:
Na - 11, 23, 11, 11, 12S - 16, 32, 16, 16, 16Ag (silver) - 47, 108, 47, 47, 61Au (gold) - 79, 197, 79, 79, 118Learn more about atomic number at: https://brainly.com/question/16858932
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Select the most appropriate tool for each measurement. exactly 200.00 ml salt solution: a 0.02-ml acid solution: approximately 400 ml water: exactly 77.5 ml methanol:
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:
Water molecules that surround a less polar molecule in solution are ________.
a. mobile and ordered
b. immobile and disordered
c. mobile and disordered
d. immobile and ordered
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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