Answer:
A. 3
____________________________________________
What are significant figures?
Significant figures are used to establish the number which is presented in the form of digits. These digits carry a meaningful representation of numbers. The term significant digits are also used often instead of figures. We can identify the number of significant digits by counting all the values starting from the 1st non-zero digit located on the left. For example, 12.45 has four significant digits.
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Answer: A
Explanation:
1.89 ==> 1 + 8 + 9 ==> 3 sig figs ==> A
a water molecule can bond to up to other water molecules by bonds. a water molecule can bond to up to other water molecules by bonds. two ... hydrogen three ... ionic four ... polar covalent two ... polar covalent four ... hydrogen
A water molecule can bond to up to 3 other water molecules by hydrogen bonding.
What is hydrogen bond ?A hydrogen bond, also known as an H-bond, is an attraction that is essentially electrostatic and occurs when an electronegative atom with a single pair of electrons, or the hydrogen bond acceptor, is covalently attached to a greater electronegative "donor" atom or group (Dn) (Ac). A polar covalent bond is often denoted by a solid line, while a hydrogen bond is denoted by a dotted or dashed line. Such an interacting system is generally represented by the symbols DnHAc. The second-row elements nitrogen (N), oxygen (O), and fluorine (F) are used as donors and acceptors the most frequently (F).Intermolecular (between different molecules) or intramolecular (occurring among parts of the same molecule) hydrogen bonds are two different types of hydrogen bonding .Learn more about Hydrogen bond with the given link
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What is a metal and nonmetal that equals Ionic bond
M+NM= Ionic Bond
if possible can you show the covalent bond too?
GIVING 80 POINTS AND BRAINLIEST
A metal and nonmetal which forms or equals to ionic bond is sodium and chlorine respectively.
The force of attraction which binds or holds together two different atoms which are metals and nonmetals is known as ionic bond.
Na + Cl ------ NaCl
Metal Nonmetal
Sodium has 1 valence electron and chlorine has 7 valence electrons, sodium readily gives it valence electron to chlorine to achieve an octet configuration.
As chlorine receives this, it has 8 valence electrons too. The bonding formed here is known as ionic bonding.
How is a covalent bond formed?A covalent bond is formed mostly between nonmetals.
For instance, a covalent bond is formed between the sharing of electrons between carbon and oxygen to give carbon dioxide.
Characteristics of ionic compounds.Most ionic compounds formed as a result of ionic bonding as characteristized by the following properties:
When dissolved in water, ionic compounds conduct electricity.Ionic compounds are also used as insulatorsIonic compounds have high melting and boiling point.Therefore, a metal and nonmetal which forms or equals to ionic bond is sodium and chlorine respectively.
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A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?
In order to help the learner categorize the material, the following inquiry is best:" Is the material malleable or ductile?".
What is a malleable material?
Any substance that can be easily hammered into a thin sheet is bendable. The metal that is most malleable is gold. In contrast, ductility refers to a solid material's capacity to deform when subjected to tensile stress.
A ductile substance is what?
The capacity of a material to be hammered thin or stretched into wire without breaking is known as its ductility. You can draw a ductile material into a wire. The majority of metals, including gold, silver, copper, erbium, terbium, and samarium, are excellent examples of ductile materials.
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Questions:
A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material? A. Is the material malleable or ductile? B. Does the material feel hard to the touch? C. Will the material float in water? D. Does the material feel rough or smooth?
Calculate the molarity when 0.554 g NH3 is dissolved to make 15.0 mL solution.
Taking into account the definition of molarity, the molarity of the solution is 2.17 g/mL.
Definition of molarityA solution is a homogeneous mixture where all the particles that exist in it. The chemical present in the greatest quantity is called the solvent, while the other components are called solutes.
Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
molarity= mass÷ volume
Molarity is expressed in units mol/L.
This caseIn this case, you have:
mass of NH₃= 0.554 gmolar mass of NH₃= 17 g/molemoles of NH₃= mass of NH₃÷ molar mass of NH₃= 0.0326 molesvolume= 15 mL= 0.015 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
molarity= 0.0326 moles÷ 0.015 L
Solving:
molarity= 2.17 moles/L
Finally, the molarity of the solution is 2.17 g/mL.
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arene and functionalized arene based two dimensional organic-inorganic hybrid perovskites for photovoltaic applications
Our study reveals that both the perovskites are direct band gap semiconductors and possess desirable band gap for solar energy absorption.
What is perovskites?Calcium titanium oxide mineral perovskite is made up of calcium titanate and has the pronunciation /prvskat/. (chemical formula CaTiO3). The perovskite crystal structure, which is the same as that of CaTiO3 (XIIA2+VIB4+X23), is the name given to the group of substances that share this structure. A wide range of tailored materials can be created by embedding numerous different cations in this framework.
It was named after Russian mineralogist Lev Perovski after being found in the Ural Mountains of Russia by Gustav Rose in 1839. (1792–1856).
Victor Goldschmidt's study on tolerance factors from 1926 is where the noteworthy crystal structure of perovskite was first discovered. X-ray diffraction data on barium titanate by Helen Megaw led to the publication of the crystal structure in 1945.
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what are the safety precautions when being in the science room (200 words essay or long paragraph)
Answer:
Know locations of laboratory safety showers, eyewashstations, and fire extinguishers. ...
Know emergency exit routes.
Avoid skin and eye contact with all chemicals.
Minimize all chemical exposures.
No horseplay will be tolerated.
Assume that all chemicals of unknown toxicity are highly toxic.
More items...
Explanation:
Using the information in the table, calculate the number of formula units in a 33.8 g 33.8 g33, point, 8, space, g sample of strontium fluoride ( S r F 2 SrFX 2 ). Write your answer in scientific notation using three significant figures.
The number of formula units in a 33.8 g sample of strontium fluoride, SrF₂ is 1.62×10²³ formula
Avogadro's hypothesis1 mole of SrF₂ = 6.02×10²³ formula units
But
1 mole of SrF₂ = 125.62 g
Thus,
125.62 g of SrF₂ = 6.02×10²³ formula units
How to determine the formula units in 33.8 g of SrF₂125.62 g of SrF₂ = 6.02×10²³ formula units
Therefore,
33.8 g of SrF₂ = (33.8 g × 6.02×10²³ formula units) / 125.62 g
33.8 g of SrF₂ = 1.62×10²³ formula units
Thus, 1.62×10²³ formula units is present in 33.8 g of SrF₂
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How much 5.70 m naoh must be added to 670.0 ml of a buffer that is 0.0200 m acetic acid and 0.0260 m sodium acetate to raise the ph to 5.75?
Volume is:
0.009524 moles of NaOH x (1L / 5.80mol) = 1.64 x 10⁻³L = 1.64 mL of 5.80 M are added
Moles acetic acid and sodium acetate:Acetic acid: 0.550L x (0.0215mol/L) = 0.011825 moles
Acetate: 0.550L x (0.0255mol/L) = 0.014025 moles
Total no. of moles = 0.025 moles = [ Acetate ] + [ Acetic acid ] (1)
H-H equation:
pH = p Ka + log [ Acetate ] / [ Acetic acid ]
Where pH is 5.75;
pKa of acetic acid is 4.74 ;
5.75=4.74 + log[Acetate] /[Acetic acid]
10.2329 = [Acetate] / [Acetic acid] (2)
Replacing (1) in (2):
10.2329 = 0.02585 - [Acetic acid]/[Acetic acid]
10.23 [Acetic acid] = 0.025 - [Acetic acid]
11.2329 [Acetic acid] = 0.02585
[Acetic acid]= 0.002301 moles.
Moles acetate:
[Acetate]=0.025 moles -0.0023 moles =0.0235 moles
Initial moles 0.0140 moles, and moles of acetate added are:
0.0235 moles - 0.0140 moles = 0.0095 moles of NaOH
1.64mL of 5.80M are added
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what happens to a cysteine residue whose side chain was previously a free thiol when you treat it with dtt
Cysteine is an amino acids.
Used to making proteins and functions is to create metabolism.
thiol (-SH) is the side chain of cysteine residue.
thiol (-SH) often works in the agile site of enzymes. In protein molecules, two cysteine residues frequently make a disulphide bond, which is important in folding the proteins and balancing their structure.
When it free thiol (which is residue of cystine) is treat with dtt the important role of DTT in molecular biological test is to hold on to the proteins in a lower condition. Dtt is soluble in ethanol.
DTT can react with proteins without the help of cystine residue and that comes under biochemical reactivity.
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claudia performed a flame test in her lab. the result of her flame test is shown here. what scientific questions could claudia ask about the flame? check all that apply. what element causes this flame color? is this the prettiest flame color? will the flame color change if another element is added? will changing the temperature affect the flame color? which flame test does the class like the best?
Claudia performed a flame test in her lab, different element causes different flame color, prettiest flame color means it is blue color flame, each element has different amount of extra energy, different part of flame have different temperature, blue color flame test class like the best.
Flame test means the method in which identify of unknown metal and metalloids ion on their characteristics and color which are come on heat on the Bunsen burner called flame test.
Here Claudia performed a flame test in her lab and in that flame test the scientific question could she ask that is and answer of this questions are as follow : different element causes different flame colour because each individual element had its own identity that's why different element causes different flame colour. prettiest flame color means it is blue colour flame this blue colour is so pretty to see in bunsen burner, each element has different amount of extra energy because when heated electron get excited and move to a diffrent orbit and as they cool down they move back to thier normal position and this extra energy produce light waves, different part of flame have different temperature, because different temperature take different colour on the flame like colder part show diffusion and flame will be red in this way, blue or orange colour test are like the class most because it seen so pretty on the bunsen burner.
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An aqueous solution contains two species, a and b. the absorbance at 300 nm is 0.372, and at 250 nm is 0.478. the molar absorptivities of a and b are:________
The absorbance at 300 nm is 0.372 and at 250 nm is 0.478. The molar absorptivities of A and B are as follows: A: ε300= 3.22x104 L mol-1cm-1 ε250= 4.05x104 L mol.
What is molarity?Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
Because the volume of most solutions very minimally changes with temperature owing to thermal expansion, using molar concentration in thermodynamics is frequently not practical. Usually, incorporating temperature adjustment factors or utilizing a temperature-independent metric will fix this issue.
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Although both sugar and salt are soluble in water, the way in which they dissolve is different. explain how their dissolving process is different, and elaborate why these differences exist.
Salt starts off as a compound, as it dissolves in ions, which always happens. Sugar, known as covalent, is bonded because they share electrons and stays together in compounds.
How do ionic compounds dissolve in water?
Ionic compounds dissolve in polar solvents, especially water. this happens when the positive cation from the ionic solid is attracted to the negative end of the water molecule (oxygen) and the negative anion of the ionic solid is attracted to the positive end of the water molecule (hydrogen)
Why do salt and sugar dissolve differently in water?
The polar water molecules attract the oppositely charged polar areas of the sucrose molecules and pull them away, leading to dissolving. Since the ions in salt and therefore the molecules bin sugar are very different, their solubilities tend to vary .
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Factories in the midwest spew out nitrogen oxide and sulfur that fall as acid rain in the northeast, and northeastern states can do nothing about it. this is an example of?
Factories in the midwest spew out nitrogen oxide and sulfur that fall as acid rain in the northeast, and northeastern states can do nothing about it.
What is acid rain?
Due to atmospheric pollution, rainfall has become so acidic that it harms the environment, primarily lakes and forests. Burning coal and other fossil fuels for industrial purposes produces waste gases that are high in sulphur and nitrogen oxides, which react with atmospheric water to form acids. The main reason for acid rain is this.
This concept is usually referred to as "acid rain" because it covers a range of acidic precipitation. Acidic deposition can happen in two different ways: moist and dry. Wet deposition is the general term for any sort of precipitation that removes acids from the atmosphere and deposits them on the surface of the planet.
Chemicals released by Midwest factories end up in the Northeast as acid rain, and the region's states are powerless to stop it on their own. Only federal regulations can address that. Different laws may have negative repercussions that spread from one state to another.
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why do bananas go bad after leaving them out for two weeks
2. Why does each metal ion in the lab have its own unique spectrum when energized?
Answer: each element contains differing numbers of electrons and thus different energy levels.
Explanation: All of the atoms of a particular element have the same number of protons, but could differ in the number of neutrons or the number of electrons. If the number of electrons changes, the atom becomes a charged particle and is called an ion. Each atom has a set of energy levels associated with it.
Vancomycin is an especially useful antibiotic for treating infections in cancer patients on chemotherapy and renal patients on dialysis. Which oh groups are bonded to sp2 hybridized carbon atoms?.
Carbonyl groups is bonded to sp2 hybridized carbon atom.
The interaction within a carbonyl group, when both the oxygen and carbon atoms are sp2 hybridized, is explained by the same hypothesis.
When a carbon atom bonds with one s-orbital and two p orbitals, it becomes sp2 hybridized. Between the three atoms, 2 individual connections and a double bond are formed. The hybridization orbitals are arranged in a triangle with bonds at 120° angles.
A carbon atom is the double to an oxygen atom to form a carbonyl group, which is a chemical organic functional group. Aldehydes and ketones, which are typically joined to another carbon compound, are the simplest carbonyl groups. Many aromatic chemicals have these structures, which contribute to flavor and fragrance.
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What is the atomic number of a hydrogen atom?
Answer:
1
Explanation:
There is proton and 1 electron in the atomic structure
0.054619 + 0.363792 + 0.217056 = ? round the answer and sig fig
Answer:
0.64
Explanation:
HELP
What is true about a pseudoscientific idea?
It can be replicated and verified.
It is improved with new information.
It ignores parts of the method within an investigation.
It tries to explain natural phenomena by analyzing, observing, and testing.
Answer:
Explanation:
Pseudoscience consists of a body of knowledge presented as being derived from scientific experiments and methods while simultaneously failing to present evidence of its veracity. Belief in various pseudoscientific ideas has been widespread in different historical periods, and even in the present day
A student wants to prepare a sugar solution for immediate use. Explain the factors that he should consider to prepare the solution.
answer based on factors affecting solubility
The factors affecting solubility the student should consider are temperature, pressure and surface area.
What is solubility?Solubility is the amount of solute that dissolves in a solvent.
Solubility can also be defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
Factors affecting solubilityThe following factors affect solubility of a solute;
Temperature: increase in temperature increases the solubility of a solute.Pressure: Gaseous substances are much more influenced than solids and liquids by pressure.Surface area: increase in surface area of a solute increases its solubility.However, there are two direct factors that affect solubility. They include temperature and pressure. Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases.
Thus, the factors affecting solubility the student should consider in preparing the sugar solution for immediate use are temperature, pressure and surface area.
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true or false
The mass number of an atom is equal to the total number of
protons and neutrons.
Answer:
True
Explanation:
I'm 90% sure it's true
What is the optimal number of receiver buffers required for a sliding window protocol and 4 sequence number?
The optimal number of receiver buffers required for a sliding window
protocol With 4 bits, the number of sequence numbers possible = 16
How do you calculate optimal window size in sliding window protocol?Maximum window size = 1 + 2*a where a = Tp/Tt Minimum sequence numbers required = 1 + 2*a.
All the packets in the current window will be given a sequence number.Although the Stop and Wait ARQ provides error and flow control, it may have serious performance implications because the sender always waits for acknowledgment even when the next packet is prepared to be sent. Consider a scenario in which you have a high bandwidth connection and a high propagation delay (you are connected to a server in another country via a high-speed connection), but you are unable to utilize this full speed due to stop-and-wait restrictions.This efficiency issue is resolved by the sliding window protocol by sending multiple packets with a larger sequence number at once. Similar to pipelining in architecture, the concept.A flow control protocol is the sliding window protocol.The sender is able to send several frames before the acknowledgments become necessary.
so the answer is the optimal number of 4 sequence numbers is 16
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classify each element. note that another term for main group is representative, another term for semimetal is metalloid, and the inner transition metals are also called the lanthanide and actinide series. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. main‑group metal (representative metal) main‑group nonmetal (representative nonmetal) main‑group semimetal (metalloid) transition metal inner transition metal (lanthanide/actinide)
The classification of the metals is;
Main group/ representative metals - Tl
Main group non metal - Se, Rn
Main group metalloid - As
Transition metal - Mo
Inner transition metal - Ru, Eu
What is the periodic table?The periodic table is a classification of elements according to their atomic numbers. We know that elements are arranged in the periodic table in order of increasing atomic numbers of the elements.
Let us now classify each element as required;
Main group/ representative metals - Tl
Main group non metal - Se, Rn
Main group metalloid - As
Transition metal - Mo
Inner transition metal - Ru, Eu
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Which molecule is formed when the protein ferrodoxin transfers electrons to an electron carrier? atp adp nadp nadph
To get the most reliable temperature measurment, a thermometer should be placed ?
A thermometer should always be submerged in a substance just deep enough to completely cover the bulb in order to measure temperatures accurately.
What is thermometer?An instrument known as a thermometer is used to measure temperature or a temperature gradient. A thermometer consists of two key components: a temperature sensor that changes in response to changes in temperature and a way to translate these changes into a numerical value.
An instrument that measures temperature is a thermometer. It is able to gauge the temperature of solids like food, liquids like water, and gases like air.
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if a plot of 1/[a] versus time produces a straight line with a positive slope for the reaction a → b c, what is the order of the reaction? a) zero b) first c) second d) third e) cannot determine order from this information
A plot of 1/[a] versus time produces a straight line with a positive slope for the reaction a → b+ c. The reaction is a second order reaction.
What is order of a reaction?
The strength of the rate's dependency on the reactant concentration determines the reaction's order. As a result, the rate of a first-order reaction will undoubtedly depend on the concentration of a single species, a second-order reaction will undoubtedly depend on the concentration of two species, and so on.
rate = k{[A]^x + [B]^y}
Thus, for the given reaction, order is 2, that is a plot of 1/[a] vs time producing a straight line with positive slope shows second order kinetics.
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Solve each problem. Give your answers to the correct number of significant figures.
a. 8.3 m x 2.22 m
b. 8432 m divide 12.5
c. 35.2 seconds x (1 minute/60 seconds)
a. 18 [tex]m^2[/tex]
b. 674 m
c. 4220 [tex]seconds^2[/tex]
Significant figures operation
When performing division or multiplication operations, the significant figure of the final answer is determined by the participating number with the lowest significant figure.
If the operation is subtraction or addition, the significant figures after the decimal of the final answer should be the same as that of a participating number with the least significant figure.
Thus;
8.3 m x 2.22 m = 18 [tex]m^2[/tex] (the least has 2 significant figures)
8432 m divide 12.5 = 674 m (the least has 3 significant figures)
35.2 seconds x 120 seconds = 4220 [tex]seconds^2[/tex] (the least has 3 significant figures)
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Recall that the color of neon lights is dependent on the type of gas that is in
the sign. Helium gas produces yellow light, neon gas produces red light, and argon gas
produces blue light. Explain what is happening to the electrons of the gas atoms in these
signs and why each gas produces different light. Which electrons have the most energy?
The chester company will increase its automation for the cure product by 2.0. assuming no further change in capacity, how much will this investment in automation cost?
By increasing its automation for the Cozy product, the Chester company's investment in automation will increase by $21,600,000.
How much does automation cost?A capital expenditure will be required to implement automation in any environment. The capital expenditure will frequently result in a significant increase in expenses for a given quarter, but it will be a worthwhile investment over the course of a company's financial statements.Automation was costly for five main reasons: Highly trained individuals who are developers in any way: They write complex code, switch VMs and browsers on and off, and deal with large-scale performance testing. Finding great developers is difficult.The risks include the possibility that workers will become slaves to automated machines, that vast computer data networks will invade human privacy, that human error in technology management will endanger civilization, and that society will become economically dependent on automation.To learn more about Automation cost refer to
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What are some examples of chemistry?
plisss
creo que es fermentacion
Answer:
Es Fermentación