These solutions used to calibrate a pH meter are known as pH buffer.
A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity of an aqueous solution:
When pH is less than seven (pH<7), solution is acidic.
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.
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Select all the correct answers. a scientist carried out several different procedures, each of which caused a change in matter. select each procedure that is likely a chemical change. salt crystals were crushed into a fine powder. bubbles were produced when iron was placed in acid. two liquids were combined, and a solid appeared. a piece of metal melted when it was heated. a white substance turned blue when water was added.
Answer:
-bubbles produced when iron placed in acid -two liquids combined and a solid appeared -white substance turned blue when water was added
Explanation:
all the other answers could be turned back into their previous state, or haven't really changed.
the property of water molecules that is responsible for all the other physical and chemical properties is
The hydrogen bonding of water is one of the main property of water which makes it responsible for all the other physical and chemical properties.
Water molecules are polar in nature and they form hydrogen bonds. Hence, they have a high boiling point , high specific heat and density. Water can exhibit the properties of an acid, as well as a base (amphoteric character). The water molecules are constantly moving and the hydrogen bonds continuously breaks and forms again. These hydrogen bonds are strong, which is the reason for the unique properties of water.
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True or false? Dimensional analysis is the study of space and time. Why?
Answer:
False.
Explanation:
Dimensional analysis is a way of converting quantities. The study of space and time is cosmology.
An oxide of iron is found to be 77. 75% iron by mass. Determine the empirical formula for this compound and name it.
Convert 5.70 kilograms to milligrams show your work
5.70 kg = 5700000mg
kg- The International System of Units (SI) uses the kilogram (sometimes known as the kilogram) as the unit of mass.
mg- a unit of mass or weight that weighs 0.0154 grains or one thousandth of a gram.
Conversion is important because It's necessary to convert units; it's not merely important. Scientists and engineers have miscommunicated, leading to the loss of space probes.
You are aware that 1,000 g make up 1 kilogram.
After that, change 1 kilogram to milligrams.
To convert from grams to milligrams, multiply the number of grams by 1,000.
A kilogram is equivalent to one million milligrams.
∵1 Kg = 1000000 mg
∴ 5.70 kg = 5.70 x 1000000
= 5700000 mg
Hence , 5.70 kilograms equals 5700000 milligrams.
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What can contribute to erosion? Select ALL that apply.
John has a solution. It turns yellow when he adds red cabbage juice. Predict what colour the solution would turn if he added hibiscus- flower juice. Explain your answer.
As the solution turns yellow when re cabbage juice indicator is added it implies that its base solution so the color of the solution when hibiscus flower juice added is dark grey to green.
when hibiscus indicator added Anywhere from dark pink to pale pink usually indicates an acid, while dark gray to green colors usually indicate a base.
Dark blue should be the color of red cabbage indicator. The cabbage indicator's color will shift to red or pink if the solution is an acid, and to green or yellow if the solution is a base. In the event that the test solution is neutral, it will stay purple or blue
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Copper ions, cu+2, are produced in solution during bioleaching. write an ionic equation for the displacement reaction between these copper ions and iron. include state symbols
An ionic equation for the displacement reaction between copper ions and iron: Cu²⁺(aq) + Fe(s) → Cu(s) + Fe²⁺(aq)
In this chemical reaction, there is a transfer of electrons from iron (Fe) to copper (Cu).
Iron change oxidation number from 0 to +2 (loose electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Fe⁰ → Fe²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
Oxidation is increase of oxidation number.
Reduction is lowering oxidation number because atom gain electrons.
(aq) is an aqueous solution.
(s) is a solid, insoluble in the water.
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In a sample of air at 25 °C, the molecules of oxygen, nitrogen and carbon dioxide all move with
different average speeds. Which of the following lists the molecules in order of decreasing average speed?
Order of decreasing average speed is Nitrogen>oxygen>carbon dioxide
According to Graham's law of diffusion, the rate of diffusion is inversely proportional to the vapour density of the molecule and therefore the smaller the weight of the molecule the faster the rate of diffusion.
Because of the above reason nitrogen has the lowest vapour density followed by oxygen and carbon dioxide with the highest and therefore nitrogen will possess the greatest speed than the others and the decreasing order are nitrogen>oxygen>carbon dioxide.
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Describe Lavoisier's famous presentation and why his assertion of
L.O.C.O.M. replaced the Phlogiston Theory of ordinary burning. In this
assignment you must briefly research the Phlogiston Theory of ordinary
burning.
The Phlogiston Theory of ordinary burning posited that the materials that were combustible all contained a material called Phlogiston.
What is the Phlogiston Theory of ordinary burning?
In science, theories are often put forward to explain a phenomenon. theory may not survive the test of time when contrary evidences begin to emerge.
The Phlogiston Theory of ordinary burning posited that the materials that were combustible all contained a material called Phlogiston which is released when the material is burnt.
However, Lavoisier was able to show by experiment that this position was a mere speculation and the the combustion of a substance was due to its reaction with oxygen.
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True or False?
Electricity is a benefit from science that we use.
Answer: This is True
Explanation: I'm only writing this part so that it counts. :)
Answer: True
Explanation: because you got to understand we use electricity every day.
you have a hot reservoir held at 30°c and a cold reservoir held at 0°c. if you move 400 j of heat from the hot reservoir to the cold reservoir, what is the total change in entropy? (1 point)
Entropy has been defined as the unavailable energy for the thermodynamic system. The total change in the entropy of the reservoir with 400 J energy is 0.15 J/K.
What is the entropy change?Entropy change has been the measure of the energy that got dispersed in the thermodynamic system. The change in energy and the change in temperature are used to give the entropy change.
Given,
Heat transferred (ΔQ) = 400 Joules
Temperature of hot reservoir (Th) = 30°C (30 +273) = 303K
The temperature of the cold reservoir (Tc) = 0°C (273K)
Using ΔS = Q ÷ T as:
For hot resorvoir:
ΔShot = - 400 ÷ 303
ΔShot = - 1.32 J/K
For cold reservoir:
ΔScold = 400 ÷ 273
ΔScold = 1.47 J/K
Total change in entropy (ΔStotal) is given as:
ΔStotal = ΔShot + ΔScold
= - 1.32 + 1.47
= 0.15 J/K
Therefore, 0.15 J/K is the change in the entropy of the reservoir when heat is transferred from hot to cold.
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is mgco3 + 2hcl > mgcl2 + H2O + CO2 a redox reaction
What charge will elements in group 16 typically have when forming ionic compounds? Example: sulfur (S, #16) (1 pt)
*
1 point
+1
+2
-1
-2
complete the mechanism for the base‑catalyzed racemization of the chiral ketone by adding any missing atoms, bonds (including wedge and dash bonds), charges, nonbonding electrons, and curved arrows (forward reaction only). step 1: draw curved arrows.
The chiral ketone (2R) -2-methyl-1-phenylbutan-1-one is converted into
(2S)-2-methyl-1-phenylbutan-1-one by base‑catalyzed racemization.
The mechanism of base‑catalyzed racemization of the chiral ketone is as above.
What is Ketone?Ketone is defined as the organic compounds having C=O as a functional group.
What is Chiral Ketone?Chiral ketone are those in which the the alkyl group bonded with C=O are same.
What is base‑catalyzed racemization?Base‑catalyzed racemization is defined as a process in which the optically active compounds which is consist of only one enantiomer are allow to converted into an equal mixture of enantiomers having zero optical activity in the presence of catalyst which is basic in nature.
Racemization rates are mainly dependents on the molecule and conditions some of them are pH and temperature.
Thus, we concluded that the chiral ketone (2R) -2-methyl-1-phenylbutan-1-one is converted into
(2S)-2-methyl-1-phenylbutan-1-one by base‑catalyzed racemization.
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Which of the following statements about metals and nonmetals is correct? (1 pt)
*
1 point
A.Metals and nonmetals can both be found in any column of the periodic table.
B.Most metals are solid under normal room temperatures while most nonmetals are a liquid.
C.Metals can be hammered into thin sheets while nonmetals are brittle.
D.Metals tend to be poor conductors of electricity, while nonmetals are good conductors of electricity.
The statement metals can hammered into thin sheets and non metals are brittle is correct. Thus option C is true.
What are metals?Metals is defined as a substance with good conductor of electricity, luster and malleability, which are ready to lose electron to form a positive ion i.e. cation. Metals can also be defined according to their periodic table.
Non metals is defined as a substance which are poor conductor of electricity, luster and malleability which are ready to gain electron to form a negative ion i.e. anion. They can be gas, liquid or solid.
Thus, metals can hammered into thin sheets and non metals are brittle is correct. Thus option C is true.
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How many significant figures are in 91010?
Answer:
4
Explanation:
Number--Scientific Notation--Significant Figures
9000 9.0×103 1
91010 9.101×104 4
956 9.56×102 3
9010.0 9.01×103 5
Answer:
Number; 91010
Scientific Notation; 9.101×10^4
Significant Figures; 4
Explanation:
Which one of the following is insoluble in water
Answer:
The correct answer is Calcium Carbonate.
Explanation:
Please ask questions correctly
6. CCC Patterns Compare the ions of elements listed in the table with the atoms of the element. For example, compare the fluorine ion to the fluorine atom. Based on the similarities and differences between the two, write a definition for "ion.'
The number of protons and electrons in an atom is equal, making them neutral particles. According to definition, an ion is an electrically charged particle that is created by either taking electrons from a neutral atom to generate a positive ion or adding electrons to produce a negative ion.
Take note that while the ion is known as fluoride, the atom is called fluorine. The electronic structure of a fluoride ion is similar to that of a neon atom (Ne). A fluoride ion, however, is not a neon atom. A fluoride ion's nucleus, which is an atom of fluorine, has 9 protons, but the nucleus of a neon atom has 10.
The fluorine atom has nine electrons, but the fluorine ion (flouride) has ten, meaning that while fluorine has nine protons and electrons, the flouride has one more electron than the fluorine atom does, which has nine and ten electrons respectively.
While flouride is negatively charged electrically, fluorine is electrically neutral.
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What's the balanced equation of 3Fe + 4H2O→Fe3O4 + 4H2?
The balanced equation of Fe + [tex]H_{2} O[/tex] → [tex]Fe_{3} O_{4}[/tex] + [tex]H_{2}[/tex] is given as ,
3 Fe + 4[tex]H_{2} O[/tex] → [tex]Fe_{3} O_{4}[/tex] + 4[tex]H_{2}[/tex]
The balance equation is the equation in which number of atom in reactant side is equal to number of atom in product side .
The inclusion of stoichiometric coefficients to the reactants and products is necessary to balance chemical equations . This is significant because a chemical equation must adhere to the laws of conservation of mass and constant proportions , meaning that both the reactant and product sides of the equation must include the same amount of atoms of each element .
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what type of bonding helps in stabilizing the alpha helix structure of a protein hydrogen bonds ionic bonds disulfide bonds hydrophobic interactions
Hydrogen bond are help in stabilizing the alpha helix structure of a protein.
Alpha helix structure is a structure whose inner section is tightly coiled main chain, its side chain extending outward in helical array. alpha helix structure is a element of secondary structure in which amino acid structure is arranged in spiral. alpha helix structure for proteins is stabilizing by intramolecular hydrogen bonding between C=O and N-H group of different peptide bond.
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EASY QUESTION IS SCIENCE PLEASE HELP.
A student says that all pure substances are elements. Do you agree? Why or why not?
A student says that all pure substances are elements. Do you agree? Why or why not?
I agree. Pure substances include only single atoms made of one element.
I disagree. Elements are not pure substances. All pure substances include only molecules and compounds, which are more complex.
I disagree. Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.
I disagree. All pure substances are also mixtures.
A student says that all pure substances are elements. Do you agree? Why or why not?
i don't. pure substances include elements, compounds and crystals. they would've been correct if they stated all elements were pure substances.
or
I disagree. Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.
the density of water at 4 degree celsius is 1.00 g/ml britanny takes a sample of water and finds the mass to be 16.7 g and the volume to be 16.2 what was her percent error
The mass is 16.7 g and the volume is 16.2. The percent error is 2 percent.
What is the percent error?Percent error is the difference between the estimated value and the calculated value. Percent error is calculated by the actual value subtracted by the expected values divided by the expected value.
Given, that the density is 1.00 g/ml
The temperature is 4-degree celsius
The mass is 16.7 g
The volume is 16.2 l
Density = m/v 16.7 / 16.2 = 1.03 which is the actual value
The estimated value is 1.00 g/ml
The formula is
1.03 - 1.00 / 1.00 = 0.02
0.02 x 100 = 2 %
Thus, the percent error is 2 %.
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George used the apparatus below to find out what substances are produced when methanol burns.
As the methanol burned two different gases were produced.
A) One of these gases condensed in the u-Tube to give a colourless liquid. Give the name of this liquid.
B) The other gas turns the limewater cloudy. Give the name of this gas
The term combustion has to do with a situation in which a substance is burnt in oxygen. When we burn a substance in oxygen, we say that the substance is oxidized.
Methanol is a member of the alkanol series of organic compounds. The equation for the combustion of methanol is shown to be as follows;
[tex]CH_{3} OH + 3O_{2} ---- > 2O_{2}+ 4H_{2}O[/tex].
Looking at the set up as we can see it in the question, we can observe the following;
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what would be the final concentration if you added the two 2 l of distilled water to the 0.5 l of 12 m kcl?
The final concentration after adding 2L of water to a 0.50 L volume of 12 M KCl is 2.4 M.
The concentration of a solute in terms of molarity is expressed as the number of moles of solute per liter of solution. The problem is regarding the dilution process of KCl. The molarity can be calculated using the dilution formula, expressed as (initial concentration of 1st solution)(initial volume)=(final concentration)(final volume). This formula shows that the number of moles remained the same throughout the process.
(12 M KCl) * ( 0.50 L) = (final concentration) ( 0.50 L + 2.0 L)
final concentration = 2.4 M KCl
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a typical atom has a diameter of about 1.0 × 10-10 m. approximately, how many atoms are there along a 1.0-inch line?
The number of atoms in 1 inch is 240 billion atoms
Given:
diameter of atom = 1.0 × 10^-10 m
To Find:
atoms are there along a 1.0-inch line
Solution:
1 inch = 0.254 m
0.254 m = 1 inch
1 m = 1/0.254 = 3.93 inch
1.0 × 10^ -10 = 3.93 x 1.0 × 10^-10 = 3.93 x 10^-10 inch
3.937 x 10-2 inches. This is approximately 4 one-billionths of an inch.
Divide 24 cm by the atomic diameter to get the number of atoms.
24/ (1.0 x 10^-10)= 24 x 10^10 = 2.4 x 10¹¹
240 billion atoms
Hence, the number of atoms in 1 inch is 240 billion atoms
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Describe how atoms form positive ions by losing electrons or negative ions by gaining electrons
Atoms form positive ions by losing electrons or negative ions by gaining electrons through a special type of chemical combination called electrovalent or ionic combination.
How atoms of sodium and chlorine combine together to form their ionsIt follows that metals are electropositive elements which donates its valence electrons to the nonmetals. The atoms which donates its electrons become positively charged while the species that recieve electrons become negatively charged.
In the formation of sodium chloride, sodium donates its 1 valence electron to chlorine become positively charged; Na+ and chlorine which recieves the electron to add to it's 7 valence electrons become negatively charged; Cl-
Na + Cl ---- Na+Cl-
So therefore, atoms form positive ions by losing electrons or negative ions by gaining electrons through a special type of chemical combination called electrovalent or ionic combination.
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equilibrium and dynamical characteristics of hydrogen bond bifurcations in water–water and water–ammonia dimers: a path integral molecular dynamics study
The path integral molecular dynamics study describes the effects of nuclear quantum fluctuations on the dynamical and equilibrium characteristics of bifurcation pathways in hydrogen-bonded dimers combining ammonia and water.
At the order of 20 K of cryogenic temperatures , the hydrogen atoms in the molecules along these isomerizations acting as hydrogen-bond donors interchange their original connective characters. It comprises three stages in the resulting quantum transition paths, the final and the initial states comprise general rotations during which two protons possess their classical-like characteristics
The impacts from quantum fluctuation are displayed in the changes operated at the medium passages over transition states, as the proton's spatial extents stretch over usual lengths comparable to the distances between dangling and connective basins of attractions.
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A fall outbreak of influenza caused many absences at work and school. Health department
officials sent out warnings to use precautions when coughing and to wash hands
thoroughly. Which members of the population are a primary concern?
Influenza viruses spread mainly through droplets of respiratory secretions in the air, typically generated by coughing and sneezing.
What is Influenza viruses?A contagious illness brought on by influenza viruses, influenza is also referred to as "the flu." Flu-like symptoms, which can range in severity from moderate to severe, frequently include fever, runny nose, sore throat, muscle discomfort, headache, coughing, and exhaustion. After being exposed to the virus, these symptoms usually appear one to four days later and remain for two to eight days.
Especially with children, diarrhea and vomiting can happen. Pneumonia, which can be brought on by the influenza virus or a subsequent bacterial infection, may develop from the viral-related illness. Other side effects of infection include meningitis, encephalitis, acute respiratory distress syndrome, and deterioration of pre-existing conditions like asthma and cardiovascular disease.
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explain any industry that uses heavy chemical as raw materials production
Answer: This may help you
https://ay.live/1vVB3
Explanation: