a. Nitrogen number 2 in guanine typically acts as a hydrogen bond acceptor.
b. N2, N2-dimethylguanine (N2-meG) is less favorable in forming base pairs with cytosine than typical guanine-cytosine (G-C) base pairs because the methylation at nitrogen number 2 changes its properties, causing a decrease in the number of hydrogen bonds and stability of the base pair.
The methyl group disrupts the hydrogen bonding potential of nitrogen number 2, reducing the number of hydrogen bonds formed between N2-meG and cytosine. This leads to a decrease in the stability of the N2-meG: cytosine base pair compared to a typical G-C base pair.
Methylation is the addition of a methyl group (-CH3) to a molecule, and is a common pattern of modification in RNA molecules. One specific pattern of methylation is the double methylation of nitrogen number 2 in guanine to form N2, N2-dimethylguanine (N2-meG). In a typical guanine-cytosine (G-C) base pair, nitrogen number 2 acts as a hydrogen bond acceptor, forming two hydrogen bonds with the nitrogen atoms in the cytosine ring.
However, the formation of a base pair between N2-meG and cytosine is less favorable than the typical G-C base pair due to the effect of the added methyl groups. The methyl groups disrupt the hydrogen bonding potential of nitrogen number 2, reducing the number of hydrogen bonds that can be formed between N2-meG and cytosine. As a result, the stability of the N2-meG: cytosine base pair is lower compared to the G-C base pair.
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Imagine a product favored chemical reaction happening in a living organism in which a substance D goes to E. It is known that the concentration of D remains well above zero and constant over time.
Given that the reaction is product-favored, how is the concentration of D maintained? Give two possible reasons.
How might the catalysis of the reaction maintain the concentration of D?
The concentration of substance D in a product-favored chemical reaction is maintained because the reaction is moving towards a state of lower energy, in which the concentration of E is at a maximum. There are two possible reasons for this:
The reaction has a high activation energy, meaning that the reaction requires a lot of energy to get started.
The reaction has a negative delta G, meaning that the reaction releases energy, so it moves towards completion spontaneously.
Catalysis of the reaction may maintain the concentration of D by increasing the reaction rate, allowing the reaction to reach a state of lower energy more quickly.
The catalyst works by lowering the activation energy of the reaction, making it easier for the reaction to get started. This means that the concentration of D can be maintained at a relatively constant level over time, even though the reaction is moving towards a state of lower energy.
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write the principle involved in the manufacture of steel by open health process
Answer:
Explanation:
In the open hearth process for producing steel in a Siemens-Martin open hearth furnace, so called because the molten metal lies in a comparative shallow pool on the furnace bottom or hearth. The hearth is surrounded by a roof and walls of refractory bricks. The charge is fed through a charging door and heated to 1,600°C to 1,650°C mainly by radiation of heat from the burning of gaseous fuels above it. It is not the amount of heat but rather the high temperature heat that is essential for the purpose.
For many purposes we can treat ammonia (NH) as an ideal gas at temperatures above its boiling point of 33. "C. Suppose the pressure on a 6.0 m sample of ammonia gas at 16.0°C is tripled. Is it possible to change the temperature of the ammonia at the same time such that the volume of the gas doesn't change? A. Yes
B. No
If you answered yes, calculate the new temperature of the gas. Round your answer to the nearest "C.
Option (a) is correct. Yes.
The new temperature of the gas is 594°C. This is calculated from the Gay-Lussac's law.
Let us consider the initial pressure is P1
The final pressure P2 = 3P1
Volume remains constant.
We can apply here the Gay-Lussac's Law. Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas where the volume is kept constant. It is a gas law which states the pressure of a gas varies directly with temperature when mass and volume are kept constant. As the temperature increases the pressure will also increase. According to this law, a gas's pressure is directly proportional to temperature. here we assume a constant volume and a constant number of moles. As pressure increases or decreases, the temperature also increases or decreases.
P1/T1 = P2/T2
T2 = P2 * T1 / P1
= 3P1 * 289 / P1
= 867 K
T2 = 867 - 273 = 594° C
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How many cm3 of 1% solution of sodium formate should be added to 100cm3 of HCl solution with C=0.05M to obtain a solution with pH=3.7
Explanation:
The exact answer to this question depends on the pH of the HCl solution and the buffer capacity of sodium formate, which can vary depending on various factors such as temperature and impurities. To determine the volume of sodium formate needed to obtain a pH of 3.7, it would be necessary to perform a titration experiment and measure the pH of the solution at various points to determine the buffer capacity of the sodium formate.
you rent a car in Germany with a gas mileage rating of 10.9 km/L. What is its rating in miles per gallon?
The mileage rating of the rent car is given 10.9 km/L. the mileage rating in miles per gallon is 25.63 mpg.
What is mileage rating ?The distance that a vehicle travels in unit volume of fuel is called its mileage rating. It depends on the performance of the vehicle such as fuel consumption, engine efficiency, feasibility of rods etc.
Mileage rate for each type of vehicles are different. Mileage is mainly expressed in miles per gallon. Gallon is a unit of volume of fluids.
1 km/L = 2.352 miles per gallon.
Hence, 10.9 km/L is converted to mpg as follows:
10.9 km/L = 10.9 km/L × 2.352 mpg/ 1 km/L = 25.6 mpg
Therefore, the mileage rating of the car is 25.6 miles per gallon.
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1. How many GRAMS of iron(II) hydroxide are present in 4.50 moles of this compound ?
2. How many MOLES of iron(II) hydroxide are present in 1.97 grams of this compound ?
(for a little extra help pls ;-; ik its 2 questions but im struggling with chem)
both gases and liquids are considered to be fluids that have individual molecules that move around with kinetic and potential energy. kinetic energy, defined as the energy related to motion, takes three forms: translational energy that occurs as a molecule moves from position a to position b, rotational energy that occurs as a molecule spins around an imaginary axis at its center of mass, and vibrational energy that occurs as individual atoms in a molecular bond move towards and away from each other. usually, molecules possess varying combinations of kinetic energy forms. in contrast, potential energy is defined as stored energy that could be released to become kinetic energy. the total energy of a molecule is fixed, meaning that a molecule has some combination of kinetic and potential energies. varying amount of kinetic and potential energies define how molecules in a fluid interact with each other. for example, when the kinetic energy of a molecule is high (greater than 1000j), it can no longer interact with neighboring molecules strongly enough to remain a liquid. however, if the potential energies are too high (greater than 1000 j), molecules cannot escape a liquid to become a gas. if the kinetic energy is high and the potential energy is low, molecules tend to become a gas and can be modeled by an equation known as the ideal gas law: pv
The General Gas Equation, sometimes referred to as the Ideal Gas Law, is a mathematical formula that describes how ideal gases behave. PV = nRT
where P is the gas's pressure, V is its volume, n is the number of moles, R is its gas constant, and T is its temperature. According to this equation, the volume and pressure for a given amount of gas at a particular temperature are equal to the number of moles of the gas times the gas constant times the temperature. This equation can be used to forecast how ideal gases will behave in certain circumstances. For instance, it can be used to figure out the volume of a gas at a specific pressure and temperature, the amount of pressure required to compress a specific amount of gas, or the density of a gas at a specific temperature.
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Which of the following explains how the system is changing when water boils in an isolated system with a movable piston, such as the one pictured?piston moves upward, increasing the volume
Piston moves upward than volume will increases when water boils in an isolated system with a movable piston.
First law of thermodynamics: The first law of thermodynamics, also termed as the law of conservation of energy, states that energy can neither be created nor be destroyed, but it will be changed from one form into another.
Mathematically, ΔQ = ΔU + W
This first law of thermodynamics will be used in movable piston.
ΔQ is the heat given or the heat lost
ΔU change in internal energy
W will be the work done
Isolated system: A system which cannot exchange matter or energy with the surroundings, is called as an isolated system.
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--The given question is incorrect, the correct question is
"How the system is changing when water boils in an isolated system with a movable piston?"--
Oxidative reactions in drug metabolism have which of the following effects on hydrophilicity and lipophilicity?A. An oxidative reaction does not impact hydrophilicity of the compoundB. An oxidative reaction does not impact lipophilicity of the compoundC. An oxidative reaction changes a lipophilic compound into a hydrophilic metaboliteD. An oxidative reaction changes a hydrophilic parent compound into a lipophilic metabolite
Oxidative reactions in drug metabolism have an oxidative reaction that changes a hydrophilic parent compound into a lipophilic metabolite. So option D is correct.
Drug metabolism refers to the biotransformation of a drug in the body. Hydrophilic compounds are soluble in water and lipophilic compounds are soluble in fats and oils.
The hydrophilicity and lipophilicity of a compound can impact its absorption, distribution, metabolism, and elimination in the body.
In oxidative reactions, a hydrophilic parent compound can be converted into a lipophilic metabolite. This can increase the lipophilicity of the drug and increase its solubility in fats and oils, allowing it to penetrate cell membranes and be more widely distributed in the body.
Therefore, answer D is correct. An oxidative reaction changes a hydrophilic parent compound into a lipophilic metabolite.
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How many carbon atoms are there in a diamond (pure carbon) with a mass of 47mg?
[tex]\boxed{\boxed{\large\textsf{There are approximately 2.4$\sf\times10^{21}$ atoms in 47 mg of diamond}}}[/tex]
Explanation:To determine the number of carbon atoms in a diamond, we can use Avogadro's constant and the number of moles of carbon present.
Avogadro's constant, which is approximately 6.022 x 10²³, represents the number of particles (atoms, molecules, compounds, ions, etc.) in one mole (a specific amount) of substance.
The number of moles (symbol n; units mol) present in a substance can be determined by dividing the mass present (in grams; symbol m), by the molar mass of the specified substance (in g/mol; symbol M), as follows:
[tex]\boxed{\Large\text{$\displaystyle\rm n\,(moles)=\frac{m\,(mass)}{M\,(molar\,mass)}$}}[/tex]
Next, we can use the molar mass of carbon, which is 12.01 g/mol (found on a standard IUPAC Periodic Table), to find the number of moles of carbon in the diamond. Firstly we convert the mass from milligrams to grams, by dividing by 1000 = 0.047 g of carbon.
Then, plugging values into the above formula, the number of moles can be found to be:
[tex]\large\textsf{$\sf\displaystyle n\left(C\right) = \frac{0.047}{12.01}=0.003913\,mol$}[/tex]
Finally, to find the number of carbon atoms, we multiply the number of moles of carbon by Avogadro's constant:
[tex]\large\textsf{N(C)\ =\ $\sf n\times N_A$}\\\\\large \textsf{$\phantom{N(C)}$= 0.003913 $\sf\times\left(6.022\times10^{23}\right)$ }[/tex]
[tex]\boxed{\boxed{\large\textsf{$\sf\therefore $ Number of carbon atoms = 2.4 atoms (2 s.f)}}}[/tex]
[tex]\hrulefill[/tex]
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Which of the following compounds would be expected to form intermolecular hydrogen bonds in the liquid state? (a) CH3OCH3 (dimethyl ether), (b) CH4, (c) HF, (d) CH3CO2H (acetic acid), (e) Br2, (f) CH3OH (methanol)
Thus, the compounds among the given options which are expected to show intermolecular hydrogen bonding are:
(c) Hydrogen fluoride-HF
(d) Acetic acid
(f) Methanol
The correct answer will be option(c), (d) and (f).
Intermolecular forces is defined as the force which acts between molecules. The examples of intermolecular forces include the London dispersion force, dipole-dipole interaction, ion-dipole interaction, and Van der Waals forces. The compounds among the given options which are expected to show intermolecular hydrogen bonding are hydrogen fluoride, acetic acid and methanol.
The types of intermolecular forces present in the given compounds are,
Acetone
Acetone, a ketone, does not possess hydrogen attached to the electronegative oxygen atom and is not expected to show intermolecular hydrogen bonds.
Methane
Methane does not produce any intermolecular hydrogen bonds due to the inefficiency of conditions allowed for hydrogen bonding.
Hydrogen fluoride
The compound shows intermolecular hydrogen bonding due to the attachment of hydrogen to electronegative fluorine.
Acetic acid
The hydroxyl hydrogen in acetic acid is capable of forming hydrogen bonds.
Bromine
The molecular bromine cannot create hydrogen bonding due to the lack of electrons after the covalent bonding.
Methanol
The methanolic hydrogen is capable of forming intermolecular hydrogen bonding.
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Which of the following exhibits the weakest dispersion force?
Select the correct answer below:
O molecules that are smaller
O molecules that are larger
O molecules that are electrostatic
O none of the above
The statement exhibits that the weakest dispersion force is molecules that are smaller.
Thus, the correct answer is A.
The London dispersion force is the weаkest intermoleculаr force. The London dispersion force is а temporаry аttrаctive force thаt results when the electrons in two аdjаcent аtoms occupy positions thаt mаke the аtoms form temporаry dipoles. This force is sometimes cаlled аn induced dipole-induced dipole аttrаction. London forces аre the аttrаctive forces thаt cаuse nonpolаr substаnces to condense to liquids аnd to freeze into solids when the temperаture is lowered sufficiently.
Dispersion forces аre present between аll molecules, whether they аre polаr or nonpolаr. London dispersion forces tend to be:
stronger between molecules thаt аre eаsily polаrized.weаker between molecules thаt аre not eаsily polаrized.For more information about dispersion force refers to the link:
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The volume of a sample of gas is measured as 3690.5 cm³.
Convert the volume to cubic meters.
3690.5 cm³ = _____ m^3
The volume of a sample of gas in cubic meters (m³) is 3.6905 × 10-³m³
How to calculate volume?Volume is the three-dimensional measure of space that comprises a length, a width and a height.
Volume is measured in units of cubic centimeters in metric, cubic inches or cubic feet in English measurement.
The volume of a substance in cm³ (cubic centimetres) can be converted to cubic meters as follows:
1 cubic centimetre = 1 × 10-⁶ cubic metre
3690.5cm³ = 3690.5 × 1 × 10-⁶
3.6905 × 10-³m³
Therefore, 3.6905 × 10-³m³ is the volume of sample of gas in cubic meters.
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Can someone explain to me how to find amounts of atoms, how many moles in grams, amount of molecules, etc. I just need a better explanation
Number of
atom
can be calculated using stoichiometry.
Moles
can be calculated by dividing mass and molar mass.
What is atom?
The smallest unit of
matter
that can be divided without producing electrically charged particles is the atom. It is also the smallest piece of matter with chemical element-like characteristics. As a result, the
atom
serves as the fundamental unit of chemistry.
Number of
atom
can be calculated using stoichiometry. Moles can be calculated by dividing mass and molar mass. Number of
molecules
can be divided by multiplying moles and Avogadro number.
Therefore, number of
atom
can be calculated using
stoichiometry
.
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Which (if any) of the following can be determined by knowing the number of protons in a neutral element? Explain your answer. a. the number of neutrons in the neutral element b. the number of electrons in the neutral element c. the name of the element
Among the following that can be determined by knowing the number of protons in a neutral element is (b) the number of electrons in the neutral element.
The atomic number of an element is always equal to the number of protons that may be found in a neutral atom. This number is what differentiates an element from others. If we know the number of protons in a neutral atom, we can compute (b) the number of electrons in the neutral element; but, we are unable to use this information to compute the number of neutrons in the element.
We may deduce that the number of electrons in an atom must be equal to the number of protons since we already know that the number of protons in every particular atom is always the same.
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which of the following compound(s) would you expect to be visible on a tlc plate using uv light? (there may be more than one correct answer)
It is most useful for visualizing aromatic compounds and highly conjugated systems, as these strongly absorb UV.
About Aromatic compoundIn organic chemistry, an aromatic compound is a type of hydrocarbon compound that is cyclic, planar, has electrons in conjugated p orbitals and obeys Hückel's rule. Therefore, these compounds are often also referred to as aromatic hydrocarbons or Arenes (Arene).
Aromatic compounds are included in unsaturated cyclic compounds which have very different chemical properties from conjugated alkenes (polyenes) so that these compounds are classified as a separate class of hydrocarbons from alkenes.
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glitter cost about $9 for a 16 ounce container if an artist wants to fill a 2L bottle with glitter, how much will they need to spend on glitter?
An artist wants to fill a 2L bottle with glitter, $38.03 will they need to spend on glitter
Calculating the problem:First, convert the volume of the 2L bottle to ounces:
2 liters = 2 x 33.814 ounces = 67.6 ounces
So, the artist needs 67.6 / 16 ounces of glitter per container = 4.225 containers
Therefore, 4.225 containers x $9 per container = $38.03 on glitter.
How do glitters work?Plastic or metal glitters are small, shiny particles used for decoration. They are frequently utilized in fashion, cosmetics, and arts and crafts and come in a variety of colors and shapes.
Why is the ounce utilized?In the United States customary units system, the weight or volume of a substance is expressed in ounces (oz). It is frequently utilized to measure the volume of liquids like oil or water as well as the weight of food, beverages, or cooking ingredients.
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The Keq for the reaction below is 40 at 550.0 °C. What is the Keq for the reverse reaction?
H2(g) + I2(g) ⇌ 2HI(g)
The Keq for the reverse reaction, H[tex]_2[/tex] (g) + I[tex]_2[/tex](g) ⇌ 2HI(g) is 0.025. If this state is not disturbed by an external force, it will persist unbrokenly.
What is equilibrium?In physics, a system is said to be in equilibrium when neither it internal energy state nor its state of motion tend to vary over time. If a simple mechanical body experiences either accelerometers nor rotational acceleration, it is thought to be in equilibrium. If this state is not disturbed by an external force, it will persist unbrokenly.
H[tex]_2[/tex] (g) + I[tex]_2[/tex](g) ⇌ 2HI(g)
Keq =40
Keq for the reverse reaction
Keq =1/40
=0.025
Therefore, the Keq for the reverse reaction, H[tex]_2[/tex] (g) + I[tex]_2[/tex](g) ⇌ 2HI(g) is 0.025.
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3. How many moles of CaCO3 are produced if 56 grams of sodium carbonate
react completely with calcium hydroxide. How many grams of sodium
hydroxide are produced?
Based on the mass of sodium carbonate reacting,
Mass of CaCO₃ produced = 52.8 gMass of sodium hydroxide produced =42.24 gWhat is the equation of the reaction of sodium carbonate reacting with calcium hydroxide?The equation of the reaction of sodium carbonate reacting with calcium hydroxide is given below:
Na₂CO₃ + Ca(OH)₂ ----> 2 NaOH + CaCO₃
Moles of sodium carbonate reacting = mass /molar mass
The molar mass of sodium carbonate = 106 g/mol
Moles of sodium carbonate reacting = 56/106
Moles of sodium carbonate reacting =0.528 moles
Moles of CaCO₃ produced = 0.528 moles
Mass of CaCO₃ produced = 0.528 * 100 g
Mass of CaCO₃ produced = 52.8 g
Moles of sodium hydroxide produced = 2 * 0.528
Mass of sodium hydroxide produced = 2 * 0.528 * 40 g
Mass of sodium hydroxide produced =42.24 g
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What is the equation for alum and ammonia
Answer:
Chemical formula: (NH4)A(SO4)2
Explanation:
Please answer the following!
Question 8:
The chemical formula of Magnesium sulfate (MgSO4) is anhydrous. To find the number of moles of anhydrate in the sample, we need to use the molar mass of anhydrate. The molar mass of MgSO4 is 120.37 g/mol.
4.06 g of MgSO4 / 120.37 g/mol = 0.03367 moles of anhydrate
So, the sample contains 0.03367 moles of anhydrate.
Perform each conversion from one metric unit of volume to another.
8.23mL=
0.0647cL=
Answer:
0.00823 L and 0.000647 L
Explanation:
Use standard metric conversions
1 cL = 0.01 Liters
1 mL = 0.001 Liters
THE ELEMENT MERCURY HAS A DENSITY OF 13.6 g/cu.cm. HOW MUCH DOES A CUBIC
FOOT OF IT WEIGH.
Mercury weighs 13.6gmL-1, which is its density, The approximate diameter of an atom of mercury is given by the formula a is 2.900410xcm.
What's the mass of a cubic foot of mercury?There are 844.90 pounds in a cubic foot of mercury. One cubic foot contains how many pounds of mercury is,the correct response is that, for the same mercury type, a change of 1 cu ft - ft3 (cubic foot) unit equals = to 844.90 lb (pound).
Mercury weighs 13.6gmL-1, which is its density. Assuming that each atom occupies a cube with edges that are the same diameter as the mercury atom, the approximate diameter of an atom of mercury is given by the formula a=2.900410xcm.
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an unknown metal M reacts with sulfur to form a compund M2S3.If 3.12g of M reacts with 2.88g of Sulfur. What is that name of M and M2S3?.
When an unknown metal M reacts with sulfur to form a compund M2S3.If 3.12g of M reacts with 2.88g of Sulfur, the name of M chromium and M2S3 will be chromium(III) sulfide.
How to explain the metalLet M = atomic weight of M
2M + 3S → M2S3
Molar ratio is 2:3
2M g of M + 3* 32.056g of S
2M/(3*32.056) g will react with 1.000 g of S
.: [2M/(3*32.056)]*2.88 g of M will react with 2.88 g of S
Given this equals 3.12 g
.: 3.12 = [2M/(3*32.056)]*2.88 = 0.05990M
M= 52.1 g; using at wt of S = 32.0 gives M = 52.0 so it is chromium At Wt = 51.996
The name is chromium(III) sulfide.
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What is the value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm? Hint: Consider the closest set of lattice planes.
The value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm is 45°.
What is diffraction?Waves spreading outward around obstructions is known as diffraction. Sound, electromagnetic radiation like light, X-rays, even gamma rays, as well as very tiny moving particles like atoms, neutrons, even electrons that exhibit wavelike qualities all exhibit diffraction.
When a loudspeaker emits sound of different wavelengths or frequencies, the loudspeaker itself functions as an obstruction and casts a shadow to its back, diffusing just the longer bass notes there.
2dsin θ = nλ
substituting all the given values in the above equation, we get
2×d×sin θ = n×λ
2×126 ×sin θ =1× 58.0
θ = 45°
Therefore, the value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm is 45°.
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A student determined the average concentration of total reducible iodine in the aqueous phase from their 'best two' determinations in Part 1 to be 0.0178 M. They also determined the average concentration of 12 in the CH₂Cl₂ phase from their 'best two' determinations in Part 2 to be 0.0198 M. Determine what the concentration of I2 in water would be based on this student's previous work. Report your final answer, in mol/L, to 6 decimal places and only include the numerical value (no units). Do not
use scientific notation for this question.
The amount of I2 in water will be 0.001202 mol/L according to the student's work.
In chemical, what is concentration?The amount of a particular chemical solute in a specific concentration of the solution seems to be how strong it is. Molarity, or the number of molecules of material in one liter of solution, is a common unit of measurement for concentrations.
How does a person concentrate?The capacity to focus is being able to control your attention. Control of attention is what it means. The capacity to concentrate without getting sidetracked on one thing, object, or concept. Focusing one's attention while ignoring extraneous thoughts is known as this.
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Fill in the blank.
A ____ property of water is that it is unreactive with oil.
Select one:
O a. Experiment
O b. Chemical
O c. Burning
O d. Liquid
A chemical property of water is that is unreactive with oil .
4. Use the balanced chemical equation from the last question to solve this situation: You combine 0.5 moles of Na2CO3 with enough CaCl2 that your compound reacts completely. How many moles of NaCl would you expect this reaction to produce? Show all work below.
The balanced chemical equation for the reaction between Na2CO3 (sodium carbonate) and CaCl2 (calcium chloride) is:
Na2CO3 (sodium carbonate) + CaCl2 (calcium chloride) -> 2NaCl (sodium chloride) + CaCO3 (calcium carbonate)
Given that you have 0.5 moles of Na2CO3, you need 0.5 moles of CaCl2 for the reaction to go to completion.
The number of moles of NaCl produced in the reaction can be calculated by multiplying the number of moles of Na2CO3 by the coefficient in front of NaCl in the balanced equation:
2NaCl/1Na2CO3 * 0.5 moles Na2CO3 = 1 mole NaCl
Therefore, the reaction between 0.5 moles of Na2CO3 and enough CaCl2 to react completely would produce 1 mole of NaCl.
Classify the figures shown below as depicting a chemical reaction, a physical change, or neither of these.
Answer:
Explanation:
A) None
B) Chemical
C) Physical
D) Chemical
E) Physical
F) None
G) Chemical
H) None
I) Chemical
Figures can be classified as depicting a chemical reaction, a physical change, or neither of these. A chemical reaction involves the formation of new substances or a change in chemical composition. A physical change involves a change in physical properties without a change in chemical composition.
Explanation:Classification of FiguresThe figures shown below can be classified as depicting a chemical reaction, a physical change, or neither of these:
Chemical Reaction: A figure showing the formation of new substances or a change in chemical composition. Examples include burning of wood, rusting of iron, and digestion of food.Physical Change: A figure showing a change in physical properties without a change in chemical composition. Examples include melting of ice, boiling of water, and tearing of paper.Neither: A figure that does not depict a chemical reaction or a physical change. Examples include figures showing static objects or processes that do not involve a change in properties.Learn more about Classifying Figures here:https://brainly.com/question/32823174
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A bowman is shooting arrows at a target. Which of the following demonstrates high accuracy but low precision?
Possible Answers:
The bowman consistently hits to the left of the target
The bowman consistently hits the bullseye
The bowman consistently hits to the right of the bullseye
The bowman consistently hits around the target but never hits the bullseye
The bowman consistently misses the target and hits a tree in the same spot
Option 4 is correct. The bowman consistently hits around the target but never hits the bullseye demonstrates his high accuracy but low precision.
Accuracy: The ability of an instrument is to measure the accurate value is known as accuracy. In other words, it is the the closeness of the measured value to a standard or true value.
Precision: The closeness of the two or more measurements to each other is called as the precision of a substance.
In a laboratory situation, high precision with low accuracy will results from a systematic error. Either the measurer makes the same mistake will repeatedly, or the measuring tool is somehow flawed. A poorly calibrated balance may give the same mass reading every time, but it will be so far from the true mass of the object.
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