The statement which describes a characteristic of a question that can be answered through scientific inquiry is that it can be answered using measurements.
What is Measurement?This is referred to as a collection of quantitative or numerical data that describes a property of an object or a body. it has units which depicts the quantities which are present and an example is the unit of length being meter.
An example of a scientific method is experimentation which include different parameters. these parameters are mostly measured to get the actual values which makes it unique among other sets.
The features of a question that can be answered through scientific inquiry is that it can be answered using measurements because different values are getting and tested when dealing with a scientific method.
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explain why the use of glycerol (1,2,3-propanetriol) in lotions helps retain water and keep the skin moist.
The use of glycerol in lotions helps retain water and keep the skin moist because it is hygroscopic compound
Hygroscopic compounds which are also known as water loving compounds, which are able to attract or hold the water from the environment, either through absorption or adsorption. Many react chemically with water such as metal hydrides or alkali metals.
One of the main application of these compounds was in absorption cycles that were used in the refrigerators.
In glycerol the presence of 3OH groups in it make is more hygroscopic in nature and therefore when we use glycerol's in the lotions, it helps retain the water in it because it now attracts water and hence keeps the skin moist.
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what is the mole fraction of oxygen gas in air (see table below)? what volume of air contains 10.0g of oxygen gas at 273 k and 1.00 atm?
The volume of 0.5 mole of oxygen gas at the given condition is 11.2 dm³.
Volume of 1 mole of oxygen at STP
The volume of one mole of oxygen at standard temperature an pressure is 22.4 dm³.
Number of moles of the oxygen gas
The number of moles of the 10 g of oxygen is calculated as follows;
n= 16/32
n= 0.5 mole
The volume of 0.5 mole of oxygen gas
V = 0.5 x 22.4 dm³
V = 11.2 dm³
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Imagine you have a chocolate cake that weighs two pounds. If you slice the cake into ten slices, what will be the weight of all the slices put together?
If you slice the cake into ten slices, the weight of all the slices put together will be two pounds.
It is given that the weight of the cake is 2 pounds. On cutting the cake into 10 pieces, we get the 2 pounds gets divided into 10 parts. On dividing, we get, 2 pounds equal to 32 ounces. Therefore,
= 32/10
= 3.2 ounces
Therefore, each piece weighs 3.2 ounces. To determine the weight of 10 pieces of cake we need to add the weight of each piece. By doing so we get
Weight of the 10 pieces = weight of the cake
Weight of 10 pieces= 3.2 x 10 pieces of cake
Weight of 10 pieces = 32ounces
32 ounces is equal to 2 pounds which is the initial weight of the cake.
Therefore, the weight of the cake after putting all the slices together is 2 pounds.
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The gallium in the image is melting in the person's hand. Which
changes will occur on a microscopic level?
O The gallium atoms will gain potential energy, moving
freely from each other.
O The gallium atoms will increase in temperature,
O The gallium atoms will be moving faster on average.
O The gallium atoms will gain kinetic energy.
The gallium in the image is melting in the person's hand changes will occur on a microscopic level is the gallium atoms will increase in temperature at its melting point
The melting point also called as liquification is the process by which the solid substances turn into liquid upon giving heat energy and there is equilibrium established between the solid and liquid phase during melting of a substances and the gallium metal has low melting point and upon touching a person hand the atom heat up and there is increase in temprature which is enough to melt it and atom heat up and liquify as it reaches its melting point
Therefore when the gallium metal is kept on a person hand the atom heat up and melt upon reaching its melting point
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Now you know what the MaKey MaKey kit can do, but how does it work? What property of the matter that it can use (bananas, water, play-dough, noodles, human skin) does the MaKey MaKey take advantage of? Explain in a MEAL paragraph how you know whether this is a physical or a chemical property.
Answer: Bananas
Explanation:
A MaKey MaKey is a small circuit board that turns physical objects (like a banana) into buttons for your computer. It works by creating electrical circuits.
Make a list of the similarities and differences between covalent bonds and london dispersion forces.
Difference between covlant bond and London dispersion forces:
covlant bond are intramolecular forces of attraction.but londen dispersion forces are intermolecular attraction forces .similarities Between covlant bond and London Dispersion Forces
London Dispersion Forces and covlant bond both of forces of attraction.London Dispersion Force
The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that occurs when electrons of two adjacent atoms occupy positions that form a temporary dipole. This force is sometimes called the induced dipole induced dipole attraction. The London force is the attractive force that causes a non-polar substance to condense into a liquid and freeze into a solid when the temperature drops sufficiently.
Dispersion forces exist between all molecules, whether polar or nonpolar.
Large, heavy atoms and molecules exhibit stronger dispersion forces than smaller, lighter ones. In atoms or molecules larger than
, the valence electrons are on average farther from the nucleus than in smaller atoms or molecules. They are held less tightly and are more likely to form transient dipoles.
The ease with which electron distribution around an atom or molecule is distorted is called polarizability.
London Dispersion forces are generally
stronger between more polarizable molecules. It is weaker between molecules that are difficult to polarize.
Covalent Bonds
Covalent bonds occur when electron pairs are shared by atoms. Atoms covalently bond with other atoms to increase stability. This is achieved through the formation of perfect electron shells. By sharing their outermost (valence) electrons, atoms can fill their outer electron shells and gain stability. Non-metals readily form covalent bonds with other nonmetals to achieve stability, and can form 1-3 covalent bonds with other nonmetals depending on the number of valence electrons they possess.
Octet Rule
The octet rule requires that all atoms in a molecule have eight valence electrons to be stable by sharing, losing, or gaining electrons. In covalent bonds, atoms tend to share electrons with each other in order to follow the octet rule. This is the amount of electrons required to fill the s and p orbitals (electron configuration), so 8 electrons are required. Also called noble gas composition. All atoms want to be as stable as noble gases.
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Find the mass of 250 ml of water. The density of water is 1 g/ml. D= M= V=
The mass of 250 ml of water is 250 g.
The mass of a substance, when volume and density are given can be found by using the following formula:
mass = density × volume
Here,
density = 1 g/ml
volume = 250 ml
mass = 1 g/ml × 250 ml
= 250 g
Therefore, the mass of 250 ml of water is 250 g.
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What is the oxidation state argon
Answer: Possible oxidation states are 0.
How does the presence of an impurity affect the melting point range of a compound?.
The presence of impurities weakens the lattice, rendering it less stable.
What is melting point?
The temperature at which solid changes its state to liquid at atmospheric pressure is called melting point of that liquid.This is point at which both liquid and solid phase exists at equilibriumHow does impurity affect M.P of compound?
Impurities lowers melting point and increase the boiling point. This is due to reason that it stabilizes the liquid phase and make it more energetically favorable. Then it extends liquid range to lower temperatures and gaseous molecules to a higher temperatures.Depression at melting point occurs because of existence of solid state of a substance. Many of the solids, such as ice, form crystalline ions or molecular repeating lattices. This lattice is kept together by forces between molecules which create strong, stable structure. The solid has to be heated to certain temperature for destruction of this structure and melting of the solid. The presence of impurities therefore weakens the lattice, and rendering it less stable. The compound then melts at lower temperature.Learn more about depression of freezing point at https://brainly.com/question/26525184
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100 POINTS
Salt
The recommended daily value of salt in an adult diet is 1,500 mg. The average
American adult consumes 3,400 mg of salt per day. How many more molecules of salt
does the average American adult consume compared to the recommended daily value?
(1 g = 1,000 mg)
Answer:
3400-1500= 1900mg or 1.9 gm
Refer to the periodic table to find the correct molar mass for each element and compound.
Cl
CH4
C2H6
O2
O
S
Answer: 35.4 g/mol ; 16g/mol ; 30.07g/mol ; 32g/mol ; 16g/mol ; 32g/mol
Explanation: For CH4 : C=12g/mol ; H = 2g/mol
Hence CH4 is 16g/mol
For C2H6 : C = 12g/mol ; H = 2g/mol
Hence C2H6 is 30.07g/mol
For O2 : O = 16g/mol
Hence for O2 is 32g/mol
calculate the expected change in boiling point when 1.00 mole of nacl and 1.00 mole of c6h12o6 are each dissolved in seperate 500. g portions of water
The expected change in boiling point of a solution containing non-volatile solutes will always be higher than that of the pure solvent.
Dissolving 0.1 mol of sodium chloride or 0.1 mol of sugar in 1 L of water gives different increases in boiling point. Sugar is not an electrolyte and does not dissociate in aqueous solution. NaCl is a strong electrolyte and completely dissociates into sodium and chloride ions. Therefore, 0.1 mol of sodium chloride and 0.1 mol of sugar produce different numbers of particles. Therefore, boiling point elevation may vary.
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A chemistry teacher mixes two clear substances together and notices a solid forming at the bottom of the beaker. Is the teacher demonstrating a physical or chemical change?.
A chemistry teacher mixes two clear substances together and notices a solid forming at the bottom of the beaker then the teacher demonstrating chemical change
A chemical changes happen when bond are broken and new ones are created and thus in science lab cash mixes two clear liquid together in a beaker and bubbles are produced and white solid form and settle to the bottom means it is a precipitate and when heat the beaker over low heat and make more observation in a chemical change and as we know that chemical change are irreversible change and come out with new product always
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If the pressure of a gas is tripled and the absolute temperature of the gas is quadrupled, by what factor will the volume of the gas change?.
Answer:
Four on three
Explanation:
We so therefore the volume of gas change by a factor of four on three. So the correct option is option d. That is four x 3 is the right answer.
Sodium is not a product of the electrolysis of sodium chloride solution because it is more __________ than hydrogen. What word completes this sentence?
Sodium is not a product of the electrolysis of sodium chloride solution because it is more reactive than hydrogen.
What is electrolysis?Electrolysis is the decomposition of a substance in a molten or solution form when a direct current is passed through it.
A substance in a molten state or a solution that allows electric current to pass through it is known as an electrolyte.
During electrolysis, the ions in the solution of molten gain or lose electrons to become discharged as neutral atoms.
The ability of ions to be discharged during electrolysis depends on the position of the ion in the electrochemical series as well as on the concentration of the ions. Reactive ions are not easily discharged during electrolysis.
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Draw the structure of the major organic product formed in the reaction of 1−methylcyclohexene with bromine in water.
The major organic product formed in the reaction of 1−methylcyclohexene with bromine in water is attached as a picture.
A reaction mechanism is a representation of step by step transfer of electrons and molecules from one compound to another compound. In reaction mechanisms, the curved arrows show the moment of electrons.
In the reaction mechanism of 1-methyl cyclohexene the double bond of 1-methyl cyclohexene act as an attacking group and attacks Br2. As a result, one Br atom gets attached to 1-methyl cyclohexene. This results in a carbocation generation on the carbon having the methyl group. This carbon cation then attacks the oxygen of water molecules and (1S,2S)-2-bromo-1-methylcyclohexan-1-ol will generates as the major product.
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Combusting an unknown hydrocarbon produces 5 mol co₂ and 6 mol h₂o. What is the empirical formula of the hydrocarbon?.
C5H12 is the empirical formula of the hydrocarbon .
What are Hydrocarbons ?
Hydrocarbons are type of organic chemical compounds composed only of the elements carbon (C) and hydrogen (H). Carbon atoms bond to form the skeleton of a compound, and hydrogen atoms bond to it in various configurations. Hydrocarbons are the components of oil and natural gas. They are used not only as fuels and lubricants, but also as raw materials for plastics, textiles, rubber, solvents, explosives and industrial chemicals.
Many hydrocarbons exist in nature. Not only do they form fossil fuels, they are also present in trees and plants. For example, it exists in the form of pigments called carotenes found in carrots and green leaves.More than 98% of raw natural rubber is a hydrocarbon polymer, a chain-like molecule with many units attached. The structure and chemical properties of individual hydrocarbons are highly dependent on the type of chemical bond that connects the constituent atoms.
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Did the Simulations from this lesson provide evidence that supported the ideas you wrote on the proposed answer? This is not a simple yes or no question. Be detailed. Why did you say yes or no?
Use the CER method to receive full credit.
Answer:
q
Explanation:
Consider a molecule that has carbon as the central atom and is best described by sp3 hybridization. How many other atoms are connected to this carbon?.
According to the molecular geometry, if carbon is central atom and is sp³ hybridized then it is attached to four other atoms.
What is molecular geometry?
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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redox reactions occur spontaneously because . multiple choice question. atoms of different elements have different tendencies to gain and lose electrons atoms of different elements have different tendencies to gain and lose protons the products of redox reactions are not soluble in water
redox reactions occur spontaneously because atoms of different elements have different tendencies to gain and lose electrons
Redox reactions are oxidation-reduction chemical reactions in which the reactants undergo a change in their oxidation states. The term ‘redox’ is a short form of reduction and oxidation. All the redox reactions can be broken down into two different processes that is a reduction process and an oxidation process.
The oxidation and reduction reactions always occur simultaneously in redox or Oxidation-Reduction reactions. The substance that are getting reduced in a chemical reaction is known as the oxidizing agent, while a substance that is getting oxidized is known as the reducing agent.
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Question 1 (1 point)
Which of the following statements correctly describes the relationship between the
reactants and the products of a chemical reaction?
The total mass of the reactants must be less than the total mass of the products.
Products and reactants always have the same physical and chemical states.
Products always have a different physical and chemical state than reactants.
The total mass of the reactants must equal the total mass of the products.
Answer: A The total mass of the reactants must equal the total mass of the products.
Explanation:
In the calvin cycle, if nadph begins to run out, what would be the first compound to accumulate?.
Answer:
1,3-bisphosphoglycerate
Explanation:
The half life of radium-226 is 1602 years. If you have 500 grams of radium today how many grams would have been present 9612 years ago?
The initial mass present is 32000 g.
What is the mass of the radium-226?We know that the half life is the time that is taken for only half of the number of the original radioactive atoms to remain. Now, we have been told in the question that the half life of the atom is 1602 years.
Now we have;
N/No = (1/2)^t/[tex]t_{\frac{1}{2} }[/tex]
N = Number of atoms at time t
No = Number of atoms originally present
t = time taken
[tex]t_{\frac{1}{2} }[/tex] = Half life of the sample
Now;
500/No = (1/2)^9612/ 1602
500/No = (1/2)^6
No = 500/(1/2)^6
No = 32000 g
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.400 moles of CO2 gas are confined in a 5.00-liter container at 25 °C. Calculate the pressure exerted in atmospheres and mm Hg.
The pressure exerted by 0.400 moles of carbon dioxide in a 5.00 Liter container at 25 °C would be 1.9563 atm or 1486.788 mm Hg.
The ideal gas lawAccording to the ideal gas law, the product of the pressure and volume of a gas is a constant.
This can be mathematically expressed as:
pv = nRT
Where:
p = pressure of the gas
v = volume
n = number of moles
R = Rydberg constant (0.08206 L•atm•mol-1K)
T = temperature.
In this case:
p is what we are looking for.
v = 5.00 L
n = 0.400 moles
T = 25 + 273
= 298 K
Now, let's make p the subject of the formula of the equation.
p = nRT/v
= 0.400 x 0.08206 x 298/5
= 1.9563 atm
Recall that: 1 atm = 760 mm Hg
Thus:
1.9563 atm = 1.9563 x 760 mm Hg
= 1486.788 mm Hg
In other words, the pressure exerted by the gas in atm is 1.9563 atm and in mm HG is 1486.788 mm Hg.
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what does the lewis dot structure of mg2 look like? group of answer choices zero pair of electrons one pair of electrons one pair of electrons, two lone electrons four pairs of electrons
The Lewis dot structure of Mg2+ look like zero pair of electrons
Lone pair: what are they?
The electrons in a lone pair are those who did not participate in any chemical reactions. Any molecule's single electron pair is represented by the following.
Any atom's lone pair of electrons= (Valence electrons - the number of electrons the atom shares) / 2.
Two electrons are lost from the magnesium atom, creating the magnesium ion, or Mg2+.
Mg has the electrical configuration 1s2 2s2 2p6 3s2 and Mg2+ has the configuration 1s2 2s2 2p6.
In the K and L shells of Mg2+, there are only 10 electrons each. The Lewis structure of Mg2+ reveals that the magnesium ion does not contain a lone pair of electrons.
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If you forgot to add the primers to your pcr reaction, what would happen and why?.
Learn PCR reaction and primer.
What is PCR?
A specific DNA segment can be quickly multiplied (amplified) into millions or billions of copies using the polymerase chain reaction, also known as PCR, so that it can be further examined in the lab.
What is primer?
A substance used as a primer coat on previously unpainted wood, metal, or canvas, especially to stop the absorption of additional layers of paint or the growth of rust.
Taq polymerase cannot add bases in the absence of a small amount of DNA, so your reaction would not succeed. Because there wouldn't be an enzyme that could add new nucleotide bases, your reaction would fail.
Therefore, your reaction would not succeed. Because there wouldn't be an enzyme that could add new nucleotide bases, your reaction would fail.
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Which of the following areas of the mitochondria has the lowest pH?a. The mitochondrial christaeb. The mitochondrial matrixc. The intermembrane spaced. The cytosol
The intermembrane space has the lowest pH in the mitochondria.
Describe mitochondria.
The majority of the chemical energy required to drive a cell's metabolic operations is produced by membrane-bound cell organelles called mitochondria. Adenosine triphosphate (ATP) is a little molecule that stores the chemical energy generated by the mitochondria. Small chromosomes unique to mitochondria make up each cell.A proton gradient is necessary for ATP synthase, which is found on the inner mitochondrial membrane, to produce ATP. Accordingly, protons must be pushed through the inner mitochondrial membrane and into the intermembrane space. As a result of the high proton concentration, the intermembrane space in the mitochondria has the lowest pH.
While the cytosol is not a component of the mitochondria, the inner mitochondrial membrane is where the mitochondrial matrix is located. Neither of these have pH values that are unusually low.
The inner mitochondrial membrane has folds called christae that increase its surface area for the activities involved in the electron transport chain. Despite being structurally important in promoting respiration, the pH of christae is similar to that of the mitochondrial matrix.
Hence, The intermembrane space has the lowest pH in the mitochondria.
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Which five systems help you change from a child to an adult?
Answer:
Infancy (neonate and up to one year of age)
Toddler ( one to five years of age)
Childhood (three to eleven years old) - early childhood is from three to eight years old, and middle childhood is from nine to eleven years old.
Adolescence or teenage (from 12 to 18 years old)
Adulthood.
Explanation:
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The number of ubatomic particle in an ion i different from the number in a neutral element. Complete figure 1 to how the miing information about each ion
Components of atoms are called subatomic particles and generally include the proton, electron, and neutron.
What are subatomic particles?
Proton:
Proton and neutron make the nucleus of an atom and hence are called nucleons.
They are positively charged subatomic particlesThe number of protons in an atom is equal to number of electrons in it.It was discovered by Ernest Rutherford.Protons can be produced via removal of an electron from a hydrogen atom.Electron:
Electrons are subatomic particles that revolve around nucleus of an atom.
Ions can be formed either by loss or gain of electronsThey are negatively charged subatomic particles.An equal number of electrons and protons are found in atoms of all elements.It was discovered by J. J. ThomsonNeutron:
Neutrons are named for their neutral nature as unlike protons and electrons they dont carry any charge
The masses of two different isotopes of an element vary due to the difference in number of neutrons in their respective nuclei.It was discovered by James Chadwick in 1932.Protons and electrons are subatomic particles which are equal in a neutral atom
What are ions?
An ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion. In ions the electrons may be less or more than the protons.In anions the electrons are more than the protons.In cations the electrons are less than the protons.learn more about subatomic particles at https://brainly.com/question/16847839
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a student weight out .250 g of an unknown diprotic acid, and uses 30ml of .1m naoh to reach the second equivalence point in titrating this acid. show how to calculate the molecular weight of this acid
If 250 g of an unknown diprotic acid, and uses 30ml of .1m naoh to reach the second equivalence point in titrating this acid, then the molecular weight of this acid is 166.67 g/ mol.
Firstly, we will calculate the total number of moles of NaOH.
As we know that,
Molarity = Moles / volume
Moles = M × volume
Given,
Molarity = 0.1 M NaOH
volume = 0.03 L
By substituting all the values, we get
0.1 × 0.03 = moles
moles = 0.003 mol
As we know that the given acid is diprotic acid which means that the second equivalent point in titrating this acid reached, two moles of NaOH is treated by one moles of acid. Due to which the relationship is given as below:
0.003 × 1 mol acid / 2 mol NaOH = 0.0015 mole
Now, we will calculate the molar mass of diprotic acid as follow:
Molar mass = g acid /mol acid
= 0.250 g/ 0.0015 mol
= 166.67 g / mol.
Thus, we concluded that 250 g of an unknown diprotic acid, and uses 30ml of .1m naoh to reach the second equivalence point in titrating this acid, then the molecular weight of this acid is 166.67 g/ mol.
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