Answer: An element has 2 isotopes: 6X at 7.59% and 7X at 92.41%. What is the average atomic mass?
Explanation:
In a bid to calculate the average atomic mass, we multiply the fraction of each isotope by the mass number , then add them together.
This is more like weighted average, as shown below:
average atomic mass=(mass number of first isotope*fraction)+(mass number of second isotope*fraction)
average atomic mass=(6X*7.59%)+(7X*92.41%)
average atomic mass= 6.92X
I don’t understand how to do this it’s very confusing
Answer:
a Naturally occurring and stable =
b. naturally occurring and radioactive
how much heat energy (in kj) will be absorbed or released if 8.33 grams of ammonia is produced?
-22.57 kJ of heat energy will be absorbed when 8.33 grams of NH3 is produced.
To determine the amount of heat energy absorbed or released when 8.33 grams of ammonia (NH3) is produced, we need to use the balanced equation for the reaction and the heat of formation for NH3.
The balanced equation for the production of NH3 is:
N2(g) + 3H2(g) → 2NH3(g)
The heat of formation, or delta Hf, of a substance is the amount of heat absorbed or released when one mole of a substance is formed from its elements at standard conditions. The standard enthalpy of formation (ΔHf°) for NH3 is -46.19 kJ/mol
To find out the amount of heat energy absorbed or released when 8.33 grams of NH3 is produced, we need to know the molar mass of NH3 and use it to convert the mass to moles, then multiply it by the enthalpy of formation.
The molar mass of NH3 is equal to 17 g/mol.
8.33 grams NH3 / 17 g/mol = 0.492 mol NH3
The heat energy absorbed or released when 8.33 grams of NH3 is produced is:
-46.19 kJ/mol * 0.492 mol NH3 = -22.57 kJ
So, -22.57 kJ of heat energy will be absorbed when 8.33 grams of NH3 is produced.
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at what point in the citric acid cycle do the methyl carbon from acetyl-coa and the carbonyl carbon from oxaloacetate become chemically equivalent?
The methyl carbon from acetyl-CoA and the carbonyl carbon from oxaloacetate become chemically equivalent at the point of the citric acid cycle where the enzyme citrate synthase catalyzes the condensation of acetyl-CoA and oxaloacetate to form citrate.
The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions that occurs in the mitochondria of cells. One of the key steps in this cycle is the condensation of acetyl-CoA and oxaloacetate to form citrate. This reaction is catalyzed by the enzyme citrate synthase. During this reaction, the carbonyl carbon of oxaloacetate and the methyl carbon of acetyl-CoA are chemically equivalent in the molecule of citrate. This reaction marks the starting point of citric acid cycle and forms the first intermediate of the citric acid cycle.
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a compound has a pka of 7.4. what is the ph of the resulting solution after we add 30 ml of 1.0 m hydrochloric acid to 100 ml of a 1.0 m solution of this compound at ph 8.0
Resulting pH = 7.4
Using Henderson Hasselbalch equation,
Since pH = pKa + log([A]/[HA])
8 = 7.4 + log([A]/[HA]), hence [A]/[HA] = 4 .....(i)
0.1 L = 0.1 mole (moles/L), hence [A] +[HA] = 0.1 .......(ii)
using eqn (i) and (ii), [A] = 0.08 moles and [HA] = 0.02 moles
After adding 30 ml of HCL, 0.03 L = 0.03 moles (mole/L)
Since [A] reduces and [HA] increases,
[A] = 0.08 - 0.03 = 0.05 and [HA] = 0.02 + 0.03 = 0.05
So new pH of solution becomes,
pH = 7.4 + log(0.05/0.05) = 7.4
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Water is essential to life. Which property of water affect(s) life less than the others?
a) Hydrogen bonds
b) Nearly colorless
c) Cohesiveness
d) High heat capacity
e) High heat of vaporization
Water is necessary for life. b) Nearly colorless property of water has the least impact on life
While all of the properties of water are important for life, the property of being nearly colorless is the one that affects life the least. The other properties, such as hydrogen bonding, cohesiveness, high heat capacity, and high heat of vaporization, all play critical roles in the functioning of living organisms and the environment. Hydrogen bonds between water molecules give water its high surface tension, which allows for the cohesion of water molecules that allows for the movement of water in plants, and the cohesion and adhesion property of water that allows for the movement of water in rivers and oceans. High heat capacity and high heat of vaporization are also important for maintaining a stable temperature range for living organisms.
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she decides to repeat the experiment using lower concentrations of lead than those she used initially. what conclusion can the scientist in this scenario make from her results?
If the scientist repeats the experiment using lower concentrations of lead than those she used initially, she can draw several conclusions based on the results of the experiment.
If she finds that the results are similar or the same as her initial experiment, she can conclude that the effect observed in her initial experiment is likely due to the lead and not a result of chance. This would provide support for her hypothesis that lead is responsible for the observed effect. Additionally, this could also indicate that the effect is likely to be present at a wide range of lead concentrations, and not just at the higher concentrations used in the initial experiment. If the results are different, however, she may conclude that the effect is dependent on the concentration of lead and that lower concentrations have a weaker effect. For example, she may have used different methods for preparing the lead solutions in the repeat experiment which could have led to variations in the final concentrations.
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an acid that has a high percentage ionization in solution is called a acid, while an acid that has a low percentage ionization is called a acid. acid strength is a measure of how readily a compound donates a(n) .
Acid the tendency of an acid to donate a proton. Thus, the more readily a compound donates a proton, the stronger the acid.
Acids and bases are measured using the pH scale.The relative strength of an acidacidacid can be predicted based on its chemical structure. In general, an acid is stronger when the H–A bond is more polar. Acidity is also greater when the H–A bond is weaker and when the conjugate base, A⁻, is more stable.acids are defined as being able to donate protons in the form of hydrogen ions; whereas bases are defined as being able to accept protons.This took the Arrhenius definition one step further as water is no longer required to be present in the solution for acid and base reactions to occur.go through the given link below to know more about acid:-
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Which method would provide evidence to support the inference that this is a exothermic reaction
The chemical change that would provide evidence of exothermic reaction is evolution of heat.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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What is required for a fossil to become petrified?
o decay
O ground water
bacteria
mold
Lice
O minerals
Minerals is required for a fossil to become petrified.The preserved remains, or signs of remains, of extinct animals are called fossils.
The remnants of the creature itself are not fossils! They're stones. An full organism or only a portion of one can be preserved as a fossil. Leaves, feathers, shells, bones, and shells may all turn into fossils. Fossils come in a wide range of sizes. Only a microscope can see microfossils. Microfossils include pollen and bacteria. Petrified trees or dinosaur bones are examples of macrofossils. Once preserved remains have aged 10,000 years or more, they are considered fossils. Deep underground rock formations are a common place to find fossils. Through replacing the original material and filling the original pore spaces with minerals, petrification is the process by which biological material turns into a fossil.
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Strontium-90 has a half-life of 28.8 years. If you start with a 10-gram sample of strontium-90, how much will be left after 115.2 years? Justify your answer.
If purple flowers are dominant in a plant and white flowers are recessive in that plant, then when purple-flowered plants with two dominant genes are mated with white-flowered plants with two recessive genes, the first generation of offspring should have
A
100% white flowers
B
75% purple flowers and 25% white flowers
C
50% purple flowers and 50% white flowers
D
100% purple flowers
If purple flowers are dominant in a plant and white flowers are recessive in that plant, then when purple-flowered plants with two dominant genes are mated with white-flowered plants with two recessive genes, the first generation of offspring should have 100% purple flowers. Therefore, option D is correct.
What is dominant gene?In genetics, dominance occurs when one variant of a gene on a chromosome masks or overrides the effect of another variant of the same gene on the opposite copy of the chromosome.
The first variant is called dominant, while the second is called recessive. When there is dominance, it is always expressed. When no dominant genes are present, recessive genes are expressed.
Purple-flowered plants with two dominant genes should produce 100% purple flowers in the first generation when mated with white-flowered plants with two recessive genes.
The attached Punnett square shows the above combination.
Thus, option D is correct.
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what trend do you notice for electronegativity down a family? explain the reason for this trend in 2-3 sentences.
Answer:
Going down a family means the elements are getting larger. As more electrons surround the positively charged nucleus, they reduce the attractive electrostatic force because they are further away, and existing electrons repulse them.
Explanation:
Electronegativity is a measure of the attraction an element has for electrons. Fluorine has a high electronegativity (2.98), while Francium does not (0.7). Fluorine more readily attracts other electrons. When going down a family on the periodic table, electronegativity decreases. This is because the existing electrons have already filled the electron shells closest to the positive nucleus. A new electron arriving near Francium doesn't experience the full attraction of the nucleus since it so far away. The existing electrons form a repulsive barrier.
Choose which of the four Spartan files is most likely to be the best approximation of the actual complex, SEFeox3LS, SEFeox3HS, B3LYPFeox3LS, or B3LYPFeox3HS. Open that file the one deemed to be the most stable spin case of Fe ( ox ) 3 − 3 in the previous question. Go to the Setup window and choose Calculations. Click the boxes next to Infrared Spectra and Vibrational Modes. Click Submit. The calculation time will depend on the processor in the computer, but may need to run overnight
More stability is demonstrated by [Fe(C). 2 \s \s O \s4 \s \s ] \s3− In comparison to non-chelates, metal chelates are more stable. Oxalate produces metal chelates.
stability and is a bidentate ligand. Because of this, [Fe(C 2 O 4 ] 3 is more stable.the four Spartan files is most likely to be the best approximation of the actual complex, SEFeox3LS, SEFeox3HS, B3LYPFeox3LS, or B3LYPFeox3HS. Open that file the one deemed to be the most stable spin case of Fe ( ox ) 3 − 3 in the previous . Go to the Setup window and choose Calculations. Click the boxes next to Infrared Spectra and Vibrational Modes. The calculation time will depend on the processor in the computer, but may need to run overnight [Co(en)3] [Co(NH3)6] is less stable than 3+. As [Co(en)3], 3+ Due to the presence of the bidentate ligand, ethylene diamine, 3+ is a metal chelate. Comparatively speaking, monodentate lignad-only complexes are less stable than metal chelates.
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a molecule will always be polar if it . a. consists of more than three atoms b. has polar bonds c. is diatomic with different electronegativities d. contains atoms with different electronegativities e. contains both carbon and chlorine
A molecule will always be polar if it has polar bonds.
For a molecule to be polar, it must have polar bonds and have those bonds organized in such a way that the bond dipoles do not cancel each other out. Molecules that are polar have both positively and negatively charged parts. A common polar substance is water. Because of its structure and the types of bonds it contains, the molecule has a slight positive charge at one end (the hydrogen end) and a slight negative charge at the other (the oxygen end). Due to the uneven distribution of electrons among the atoms and the asymmetrical nature of the water molecule, the hydrogen atoms at one pole of the molecule are positively charged, while the oxygen atoms at the other pole are negatively charged (side). We use the term "electrically polar" to describe the water molecule.
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1. How many moles of methane (CH4) are needed to produce 5.75 moles of water vapor? (Assume excess oxygen.) CH4(g) +202(g) → CO₂(g) + 2H₂O(g)
5.75 moles of water vapor require 2.875 moles of methane, CH4, which is required in a different way.
How can I calculate the necessary mole of CH4?The moles of CH4 that reacted from the balanced equation will be obtained first.
O2 + CH4 = CO2 + 2H2O
Given the above-mentioned balanced equation,
From 1 mole of CH4, 2 moles of H2O were created.
We can calculate the amount of moles of CH4 required for the reaction using the information above. Details are provided below:
Given the above-mentioned balanced equation,
From 1 mole of CH4, 2 moles of H2O were created.
Therefore,
The formula is: (5.75 1) / 2 = 2.875 moles of CH4 yields 5.75 moles of H2O.
The formula is: (5.75 1) / 2 = 2.875 moles of CH4 yields 5.75 moles of H2O.
In light of this, we can say that 2.875 moles of CH4 are required.
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bromobenzene used in the experiment is 3.2 g. what is the mass of magnesium turnings (mg) that is 1.25 molar equivalent to the amount of bromobenzene used? use the molar mass data available in the manual.
We can calculate the number of moles of magnesium that is equivalent to the bromobenzene used:
n_Mg = n_Br * 1.25 = 0.020mol * 1.25 = 0.025mol
Finally, we can calculate the mass of magnesium:
m = n * M
m = 0.025mol * 24.31 g/mol = 0.6 g.
So the mass of magnesium turnings equivalent to the amount of bromobenzene used is 0.6 g.
What is a molar equivalent?A molar equivalent is a unit of measurement that corresponds to the number of moles of a reactant that is needed to react with one mole of another reactant.
What is bromobenzene used for?Bromobenzene is a clear, colorless liquid with a pleasant odor. It is primarily used as a solvent and motor oil additive, and in making other chemicals.
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compare the three states of matter in terms of their shape and volume. explain in your own words why a gas takes both the shape and volume of its container, compared to solids and liquids?
Solids have a fixed volume as well as a fixed shape. Liquids have a fixed volume but liquids do not have a fixed shape. Gases do not have a fixed volume or a fixed shape and take up the shape and volume of the container they are placed in due to the weak intermolecular forces of attraction.
Among the three states of matter, solids have the most rigid structure. This is because solids have the strongest intermolecular forces of attraction amongst them and have a fixed shape as well as volume.
Among solids, liquids and gases, liquids have intermediate forces of attraction and hence they have a fixed volume but not a fixed structure and hence they take the shape of the container in which they are kept.
Particles of gases have the weakest intermolecular forces of attraction and hence they have no fixed volume or fixed shape and hence gases take up both the shape as well as the volume of the container they are kept in.
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What's the structural formula of 4, 4 dimethyl pent-2-ene?
The structural formula of 4,4-dimethyl pent-2-ene is:
H3C-CH2-CH(CH3)-CH(CH3)-CH2-CH3.
This molecule contains a pent-2-ene chain which is composed of 5 carbon atoms and 2 double bonds with a methyl group (-CH3) attached to the 4th and 5th carbon atoms. The structural formula of 4,4-dimethylpent-2-ene represents the arrangement of atoms in the molecule using chemical symbols and bond lines.
The chemical symbol for carbon is "C" and for hydrogen is "H". In this structural formula, you can see that there are 5 carbon atoms (C) and 14 hydrogen atoms (H) in the molecule.
The line (-) represents a single bond, which is a covalent bond between two atoms. The double bond is represented by "=".
The molecule contains a pent-2-ene chain which is composed of 5 carbon atoms and 2 double bonds between the 2nd and 3rd and 4th and 5th carbon atoms. The molecule also contains two methyl groups (-CH3) attached to the 4th and 5th carbon atoms. A methyl group is a functional group that contains one carbon atom and three hydrogen atoms.
This structural formula is a way to represent the molecular structure of 4,4-dimethyl pent-2-ene in a simplified way.
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A spring with a spring constant of 3N/m is stretched until extended by 1.4m. How much elastic potential energy is stored by the spring?
Give your answer to 2 decimal places
The energy that is stored in the spring is 2.94 J.
What is the elastic potential energy?We have to note that the elastic potential energy of the spring is the energy that has been stored in the spring and it is released to be able to do work once we pull the spring.
In this case we already know that;
W = 1/2Ke^2
W = work done
K = force constant
e = extension
Thus;
W = 0.5 * 3 * 1.4^2
W = 2.94 J
We can see that the stored energy for the spring in question is 2.94 J of energy stored.
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A compound called calcium nitrate tetrahydrate is analyzed and determined to contain 0.44 moles of calcium nitrate. How many moles of water does this compound contain?
Calcium nitrate tetrahydrate is written as Ca(NO3)2.4H2O, which means that it contains one mole of calcium nitrate (Ca(NO3)2) and four moles of water (4H2O).
Since we know that the compound contains 0.44 moles of calcium nitrate, we can use the coefficient of the water in the chemical formula to find out how many moles of water the compound contains. The coefficient of water in the chemical formula is 4, so we can use it to calculate the number of moles of water in the compound:
0.44 moles of calcium nitrate x 4 moles of water/1 mole of calcium nitrate = 1.76 moles of water.
So the compound contains 1.76 moles of water.
How would you prepare 500cm³ solution of 0.25 mol/dm³ of Potassium hydrogen phthalate KHC8H4O4 (K=39, H=1 C=12 O=16)
We would need to measure 25.5 g of the potassium hydrogen phthalate an d make up to 500cm³ mark.
What is the preparation?We know that we can be able to prepare a chemical if we can be able to measure out a given mass of the chemical that is in question and then make up to the mass that we need.
In the case of the Potassium hydrogen phthalate that we have;
Number of moles to be prepared = concentration * volume
= 0.25 mol/dm³ * 500/1000 L
= 0.125 moles
Mass of the compound = Molar mass * Number of moles
= 0.125 moles * 204 g/mol
= 25.5 g
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will a bond form if an atom of this element moves towards an atom having seven valence electrons? why or why not?
No, it would not be very probable to happen because the first element, neon, is already stable due to the fact that the outermost shell of its atom is completely filled.
An electron that is linked with an atom and that can take part in the development of a chemical bond is referred to as a valence electron. In the formation of a single covalent bond, each of the atoms in the bond contributes one valence electron in order to form a shared pair.
It is possible for the existence of valence electrons to determine the chemical characteristics of an element as well as whether or not it can form bonds with other elements. A valence electron can only exist in the most outer electron shell of an element that is part of the main group.
An atom that has its valence shell completely filled with electrons has a high probability of being chemically inert. A highly reactive atom is one that has one or two valence electrons in excess of what is required for a closed shell. This is because the additional valence electrons can be quickly stripped away to produce a positive ion.
An atom that has one or two valence electrons less than a closed shell is also extremely reactive. This is due to the fact that such an atom has a greater propensity to either gain the missing valence electrons or share valence electrons with neighboring atoms.
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I need help with these questions
A chemical compound is a substance formed by the union of two or more chemical elements in a fixed ratio, the union being a chemical bond.
A pure substance is a substance that are made up of only one kind of particle and have a fixed or constant structure. Pure substances are further classified as elements and compounds.
A molecule is the smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.
A mixture is a compound made up of two or more chemical components that are not chemically linked together. This means that a mixture can be made of elements, compounds etc. but not the other way round.
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Part B
Now observe the properties of the liquid in the container labeled unknown. Record the properties of the unknown
substance in the table.
Based on the observed properties of water and rubbing alcohol, the properties of the unknown substance are as follows;
It is colorless and dissolves readily in water but sparingly in rubbing alcohol.the substance is a polar substanceWhat are the properties of alcohol and water?The properties of water are as follows:
water is a colorless, odorless, and tasteless liquidWater can dissolve saltwater is a polar liquidThe properties of rubbing alcohol are as follows:
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Complete question:
Part A
Water and rubbing alcohol have distinct properties and will react differently with the same substance. Observe these properties of water and rubbing alcohol: color, smell, and ability to dissolve the salt. Record your observations in the table. To observe the solubility of salt in the liquid, put a one-quarter teaspoon of salt into each container and stir. You may weigh out 1.5 g of salt on the electronic balance if you don’t have a one-quarter teaspoon measure.
Part B
Now observe the properties of the liquid in the container labeled unknown. Record the properties of the unknown substance in the table.
an unknown compound has the following chemical formula: where stands for a whole number. measurements also show that a certain sample of the unknown compound contains of sulfur and of phosphorus. write the complete chemical formula for the unknown compound.
The complete chemical formula for the unknown compound P₄Sₓ is P₄S₆.
The given unknown compound has the formula P₄Sₓ , where P stands for phosphorus and S stands for sulphur. "X" stands for a whole number which denotes the number of sulphur atoms in the compound.
To determine the value of "X" we need to know the ratio between P and S. There are 4 phosphorus atoms present in the compound.
Since it is given that, we have 6.3 moles of phosphorus(P) and 9.4 moles of sulphur (S). In order to express this in terms of 1, we can divide both sides by 6.3 moles to get a ratio of 1 to 1.5
P= 6.3/6.3= 1
S= 9.4/6.3=1.5
This implies, for every 1 P, there is 1.5 S . So, for 4 P we get;
P= 1× 4= 4
S= 1.5× 4= 6
Thus, for every 4 P we will have 6 S.
Hence, the complete chemical formula is P₄S₆.
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examples of soluble and insoluble salts
Explanation:
This is answer is given the following
2. Which of the following types of particles found in an atom has no charge?
A. Electron
B. Nucleus
Neutron
D. Proton
Answer: Neutron
Explanation:
Protons have a positive charge (+).
Electrons have a negative charge (-).
Neutrons have no charge.
Aluminum + hydrochloride acid yield aluminum chloride + hydrogen gas
What’s the balanced equation?
Aluminum + hydrochloride acid yield aluminum chloride + hydrogen gas therefore the balanced equation is 2Al+6HCl→2AlCl₃+3H₂.
What is a Chemical reaction?This is referred to as the process in which one or more substances which are called the reactants, are converted to one or more different substances known as the products and it involves the exchange of electrons between elements.
In this scenario, when Aluminum and hydrochloride acid reacts they form aluminum chloride and hydrogen gas which is the product and the equation can be seen above.
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the superalloys divide into three basic groups, according to the base metal used in the alloy. which one is not one of these three groups.
The superalloys divide into three basic groups, according to the base metal used in the alloy. Name the three groups: (1) iron-based alloys, (2) nickel-based alloys,and (3) cobalt-based alloys.
WHAT IS SUPERALLOYSuperalloy materials are materials that have been developed to have the ability to maintain their strength at high temperatures (> 650oC) for a long time. A good combination of high strength and good ductility at low temperatures as well as good surface stability, surface stability means corrosion resistance, the formation of Cr2O3 and Al2O3 will improve surface stability. Superalloys originate from group VIIIB elements and generally consist of various combinations of Fe, Ni, Co, and Cr.
There are also alloying elements in smaller amounts, including W, Mo, Ta, Nb, Ti, Al, and V. Alloys in small amounts play a role in increasing strength by:
1. Mechanism of solid solution strengthening (W, Mo, Ti),
2. Forming carbides (W, Mo, Nb, Ta, Ti, V),
3. Precipitation strengthening (Al and Ti).
The reinforcement mechanism in superalloys is also controlled by means of:
1. Minimizing the formation of brittle phases: sigma phases, chi phases,
2. Controlling the carbide that is formed (so that it is not too brittle),
3. Controlling the grain size (so that the strength does not decrease).
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two ways can scientists exhibit ethical behavior?
Answer:
1. Creating products that improve people's lives.
2. Remaining impartial about data while conducting experiments.