The correct identification of the units is given below:
S.I Units: meter, kilogram and KelvinUS customary units: gallon. mile, pound, degrees FahrenheitWhat is the SI Unit?The SI units and the physical quantities they represent are the meter for length, the second for time, the kilogram for mass, the kelvin for temperature, the candela for light intensity, the ampere for current flow, and the mole for substance amount.
US customary units refer to the system of measures used in the US to measure objects. All other measures are conventional, including the gallon for volume, mile for length, pound for mass, and degree Fahrenheit for temperature.
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identify each unit as belonging to si units or us customary units. gallon. mile. meter. pound. kilogram. degrees farenheight. kelvin.
Atoms disappear during a chemical change true or false
Answer:
False
Explanation:
In a chemical reaction, only the atoms present in the reactants can end up in the products.
No new atoms are created, and no atoms are destroyed.
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Please answer my question.
The reaction is correct since the -NHCH3 moiety protonated leading to the hydrolysis of the amine . Option D
What is the hydrolysis of amides?We know that when we talk about hydrolysis, what we ,mean is the fact that there is a compound that is broken up. The breaking up of the compound would lead to the folrmation of the products of the reaction.
In the case of what we have here. We can see that when we react the acid with the amide the point of attack is the -NHCH3 and this would cause it to break off from the amide and then the products are formed.
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When a 0.57-g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 390 g of water from 22.7∘C to 37.5 ∘C .
The energy value of olive oil is 42.37 kJ/g. The enthalpy from the olive oil is 52.198 kJ/mol.
The question isn't complete. A similar question is in the attachment. A calorimeter is a tool that use to measure heat energy according to the equation
Q = m × c × ΔT
m = mass of water in calorimeter = 390 gramsc = specific heat capacity (J/g °C)The heat energy that release
Q = m × c × ΔT
Q = 390 × 4.184 × 14.8
Q = 24,150.048 J
Q = (24,150.048 ÷ 1,000) kJ
Q = 24.15 kJ
The energy value is the ratio between the heat energy and the mass. For this problem
Mass of olive oil = 0.57 gramsQ = 24.15 kJEnergy values = Q ÷ mass = 24.15 ÷ 0.57 = 42.37 kJ/gThe formula to calculate the enthalpy ΔH = Q ÷ n
n = number of moles Q = heat energy = 24.15 kJΔH = enthalpyOlive oil C₈₈H₁₆O₁₀Learn more about heat energy here: brainly.com/question/28842664
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Which type of molecule is
shown below?
O A. Alkyne
• B. Alkane
O C. Aromatic
O D. Alkene
In the formation of carbon dioxide from carbon monoxide and oxygen, how many grams of carbon dioxide are produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide?
The amount of carbon dioxide produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide is 16 grams.
How many grams of carbon dioxide are produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide?In the reaction of 8 grams of oxygen with an excess of carbon monoxide, 16 grams of carbon dioxide are produced.This is an example of a combustion reaction, whereby oxygen and a fuel, in this case carbon monoxide, combine to produce energy in the form of heat and light, as well as the product carbon dioxide.The reaction can be represented by the equation: 2CO + O2 → 2CO2.This equation indicates that for every 2 moles of carbon monoxide and 1 mole of oxygen, 2 moles of carbon dioxide are produced.Since 8 grams of oxygen is equal to 1 mole, 16 grams of carbon dioxide are produced.The excess of carbon monoxide ensures that all of the oxygen is used up in the reaction, resulting in the maximum amount of carbon dioxide being produced.To learn more about combustion reaction refer to:
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Gold (atomic mass=197) is plated from a solution clauric acid H4UCl4, It deposits on the cathode. Calculate the time to deposit 0.50g of gold passing a current of 0.10 (F=96485C)
Gold (atomic mass=197) is plated from a solution clauric acid H4UCl4, It deposits on the cathode. The time to deposit 0.50g of gold passing a current of 0.10 is 2.4 hour.
What is current ?The movement of electrons through a wire is referred to as electric current. The number of charges that move through the wire per second is measured in amperes (amps).
One mole of gold require 3 mole electron
Mass of gold deposited = 0.50g
Molar mass of gold = 197g
No of mole of gold = 0.50g/197g
= 0.0025
No of electron required = 3 × 0.0025
= 0.0076
1mole of electron having the charge of 96485C
Therefore, Columns for 0.0076 mole of electron = 940.43C
0.1 A current means 0.1 Columbs per second
Therefore, time to deposit 0.50g of gold = 940.44/0.1
= 9404.4second
= 2.4 hour
Thus, the time to deposit 0.50g of gold passing a current of 0.10 is 2.4 hour.
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Determine the number of atoms in 29.0
grams of sodium, Na. (The mass of one
mole of sodium is 22.99 g.)
The number of atoms in 29.0grams of sodium, Na is 7.58 × 10²³ atoms.
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number; 6.02 × 10²³.
no of atoms = no of moles × 6.02 × 10²³
According to this question, there are 29.0 grams of sodium (Na). The number of moles can be calculated as follows:
moles = 29.0g ÷ 22.99g/mol = 1.26mol
No of atoms = 1.26 mol × 6.02 × 10²³
no of atoms = 7.58 × 10²³ atoms
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Consider the reaction.
MnS(s)+2HCl(aq)⟶MnCl2(aq)+H2S(g)
If the small amount of MnS is combined with the large amount of HCl, what is the mass of the products? The mass of any excess reactants will also be included in this total.
Mass of Empty flask - 400g
Mass Empty beaker- 250g
Mass of small amount flask- 404.35g
Mass of large amount flask - 408.70g
Mass of small amount beaker- 300g
Mass of large amount beaker -350
Mass of Small amount flask and large amount beaker = 504.35g
Mass of Large amount flask and small amount beaker = 458.70g
If the small amount of MnS is combined with the large amount of HCl, The mass of any excess reactants will also be included in this total is the mass of the beaker with the small amount of MnS(s) and HCl(aq) after reaction is 504.35g.
What is balance chemical equation ?A balanced chemical equation is one that has the same number of atoms of each type in the reaction on both the reactant and product sides. In a balanced chemical equation, both the mass and the change are equal.
The balance chemical equation is as follows:
MnS(s) + 2HCl(aq) ⟶ MnCl₂(aq) + H₂S(g)
Thus, The mass of any excess reactants will also be included in this total the mass of the beaker with the small amount of MnS(s) and HCl(aq) after reaction is 504.35g.
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NH3
Express your answer using four significant figures. What mass%N?
The percent by mass of the nitrogen is 82.4%.
What is the percent by mass?We have to note that the percent by mass can be obtained when we know the molar mass of the compound and that is the first thing that we would need to find in the problem that we have in the question that have been asked.
The molar mass of the compound is; 14 + 3(1) = 17 g/mol
The percent by mass = Mass of N/ molar mass * 100/1
= 14/17 * 100/1
= 82.4%
The nitrogen would have a percent by mass in the compound of about 82.4%
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Using a new swab each time will prevent contamination and false results
True
False
The statement given above is true.
Use only synthetic fiber swabs that have tiny wire or plastic shafts and were created specifically for sampling nasopharyngeal mucosa. Avoid using swabs made of calcium alginate or those with wooden shafts since they may contain chemicals that render some viruses inactive and thwart molecular testing. Although an OP specimen is a valid specimen type, the CDC advises only collecting the NP specimen. To increase test sensitivity and reduce the usage of testing resources, merge both NP and OP specimens into a single tube if they are obtained.
Maintain proper infection control and use the recommended personal protective equipment (PPE), which includes an N95 or higher-level respirator (or face mask if a respirator is not available), eye protection, gloves, and a gown, for healthcare professionals taking samples from patients or working within 6 feet of patients suspected of having the SARS-CoV-2 virus.
Follow standard precautions for healthcare professionals handling specimens who are not actively involved in the collection (such as handling self-collected specimens) or who are not working within 6 feet of the patient. Whenever they are within a healthcare institution, healthcare personnel should always wear some sort of source protection, such as a face mask.
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The rate of reaction is affected by all except........
The rate of a reaction is affected by several factors such as concentration, temperature, etc. except the magnitude of equilibrium constant. It is the Chemical kinetics that deals with the study of rate of reactions.
What is rate of a reaction?The rate of decrease in the amount of the reactants or the rate of increase in the amount of products is generally known as the rate of a reaction. It is usually expressed in the unit mol L⁻¹ s⁻¹.
The rate of a reaction is influenced by many factors like reactant concentration, temperature, presence of catalyst, intensity of radiations, etc.
In general, the increase in the concentration of the reactant, increase in the temperature of the system and the presence of a catalysts increases the rate of the reaction.
There is no relationship between the equilibrium constant and the rate of the reaction. The rate equation is given as:
Rate = k [ Reactant]ⁿ
Here k is the rate constant not the equilibrium constant.
The extent to which the reactants are changed into the products is given by the magnitude of equilibrium constant. It does not affect the rate of a reaction.
Thus the rate of a reaction is affected by all except magnitude of equilibrium constant.
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What are chalcogenes? In chemistry
Answer:
The chalcogens are the elements that belong to group 16 of the modern periodic table (or the oxygen family). Chalcogens consist of five elements – oxygen, sulfur, selenium, tellurium, and polonium.
The chalcogens (ore forming) are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. Group 16 consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv).Explanation:
Answer the question OR ELSE... you will eat a French Fry with a beatle in it.
N2 + 3H2 --> 2NH3
What volume(L) of NH3 at STP is produced if 25.0g of N2 is reacted with an excess of H2 ?
Question 1 options:
40.0 L
25.0 L
45.0 L
0.89 L
Answer:
40.0L
Explanation:
9. If 150 g of water at 25°C are mixed with 75 g of ethyl alcohol at 95°C, find the final temperature of the system.
Enthalpy is the energy that travel through one object to the other when temperatures are different. Therefore, 31.4°C is the final temperature.
What is enthalpy?Enthalpy is the energy that travel through one object to the other when temperatures are different. Enthalpy passes from the hot to the cold object when two object with different temperatures are brought closer.
From one state to another, such as from solid to liquid, from such a solid to a vapour, from either a liquid to a vapour, either from one solid form to another, a substance can absorb enthalpy without increase in temperature.
q=m ×c×ΔT=m ×c×(T −Ti)
q=-m×c×ΔT= -75 ×4.18(T−95°C)
q=m×c×ΔT=150×4.18(T− 25°C )
-75 ×4.18(T−95°C) =150×4.18(T− 25°C )
final temperature=31.4°C
Therefore, 31.4°C is the final temperature.
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Suppose a different fatty acid molecule were used, with a molecular volume of 4.48 x 10-22 mL/molecule, and a molar mass of 235 g/mol. Use these data and the expected value for Avogadro's number to calculate its density (g/mL) by dimensional analysis. Hint: try starting with 235 g over 1 mole.
The dazzling colors produced by fireworks result from excited gaseous atoms or molecules emitting light. The normal electron configuration of an atom is known as the
"ground state." In ground state all electrons are in the lowest energy levels available. When atoms or ions are heated, some electrons may absorb enough energy to
allow them to "jump" to higher energy levels. The atom or ion is then said to be in the "excited state." The electrons cannot remain in this excited state for long and will
emit energy in the form of light when they return to ground state. It is this light we see when an atom is heated in a flame. The frequency or color of light emitted
depends on the energy difference between the excited state and the ground state.
Chose the correct ground state configuration for Sr
1s22s22p63s23p64s23d104p65s2
1s22s22p63s23p64s23d104p8
1s22s22p63s23p64s23d104p75s1
1s22s22p63s23p64s24p64d105s2
Answer:
The ground state electron configuration of Sr (Strontium) is 1s22s22p63s23p64s23d104p65s2. This means that the electrons in the Sr atom occupy the lowest possible energy levels available to them. The electron configuration is written as a series of numbers and letters that indicate the number of electrons in each orbital. In this case, the first electron goes in the 1s orbital, the next two electrons go in the 2s orbital, the next six electrons go in the 2p orbital, the next six electrons go in the 3s orbital, the next six electrons go in the 3p orbital, the next ten electrons go in the 4s orbital, and the final two electrons go in the 5s orbital. When Sr is heated and its electrons are excited, they absorb enough energy to jump to higher energy levels. When these electrons then return to the ground state, they emit light of a specific frequency or color.
Which of the following is the equation for impulse?
impulse =p
impulse =mv
impulse =FΔt
impulse =ma
The correct equation for impulse is FΔt. The third option.
What is impulse?In mechanics, the impulse is the amount of force applied to an object for a certain amount of time leading to a change in the momentum of the object.
The impulse is mathematically expressed as:
Impulse = FΔt
Where F is the amount of force applied in Newton and Δt is the changes in the time spent applying the force. In other words, impulse is the product of force in Newtons and time in seconds.
Thus:
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In this lab, you will do experiments to identify types of changes. Using the question format you learned (shown above), write an investigative question that you can answer by doing these experiments.
An investigative question that you can answer by doing these experiments is: what type of change is not easily reversible and which is reversible
What are the two types of changes?The two types of changes are given below:
physical change and chemical changePhysical changes are changes that are easily reversible and which do not result in the formation of new substances. Examples of physical change include the melting of ice, the freezing of water, and the dissolution of sugar in water.
Chemical changes are changes that are not easily reversible and which result in the formation of new substances. Examples of chemical changes are rusting of iron, burning of wood, etc.
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Consider the endothermic reaction N2(g) + 3H2(g) ⇌ 2NH3(g). How does the following action affect an equilibrium reaction by driving the reaction? Increasing the volume of the system, while decreasing pressure
is this a forward or reverse reaction
For the given reaction, increasing the volume of the reaction system will shift the equilibrium to forward reaction. Decreasing the pressure will shift the equilibrium to the reverse direction.
What is chemical equilibrium ?The state of a reaction at which, the back ward and forward reaction takes place in equal rates is called equilibrium state. According to Le -Chatlier's principal, if any disorder imbalance the system, the system will balance it and shift to a new equilibrium state.
When the volume of reactants is increased, the reaction changes to the forward direction in which the increased volume is decreased. Hence, as the volume increases, forward reaction takes place.
When the pressure is decreased, the reaction will shift to the direction in which the number of moles of gas is increasing to increase the pressure. Here, the reactant side haves the 4 moles of gases and product side have 2 moles of gas.
Hence, decrease in temperature make a shift to the reverse reaction.
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Total anions =
Total cations =
The total number of cation is 1 and the total number of anion is 1.
What is cation and anion ?The positively charged particles are called as cation and the negatively charged particles are called as anions.
The number of atoms present in unit cell at corner are 4 red ( B cation ) 4 Blue (A cations)
Total number of cations at the corner = 8
1 atom at corner have 1/8th of its portion
8 atom have 1/8th × 8 atom = 1 atom
Number of cation = 1
Atoms at the edge contributes ¼ th portion
There are 4 anions at edges
Contribution from 4 anions
= 1 / 4 × 4
= 1
Total anions = 1
Total cations = 1
Thus, the total number of cation is 1 and the total number of anion is 1.
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the total pressure of gas collected over water is 650 mmHg and the temperature is 19.5c what is the pressure of hydrogen gas formed in mmHg
The pressure of hydrogen gas formed in mmHg is 633.5mmHg.
Pressure of hydrogen gas = total pressure - vapor pressure of water
Vapor pressure of water at 19°C = 16.5 mmHg
Hydrogen gas pressure = 650.0mmHg to 16.5mmHg = 633.5mmHg
About pressurePressure is the magnitude of a strong pushing force. In Physics, pressure is a popular material whose phenomena we can easily find.
Pressure is the magnitude of the force acting on each unit surface area. The emergence of the pressure phenomenon is the result of a push on an object in a perpendicular direction.
A simple example of the pressure phenomenon is when we stand with two feet pressing against the ground. The push from our feet produces pressure that keeps balance awake.
Pressure is not only related to force but also to area, volume, and temperature. In addition, we can know the factors that affect the amount of pressure based on the type of substance itself.
The international unit for pressure is the newton per unit area (N/m2), while the symbol for pressure is P or p. In addition, another unit of measurement for pressure is Pascal (Pa), which is the last name of the French physicist, Blaise Pascal.
Then it can be stated that 1 N/m2 = 1 Pa
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Select all the measurements that could represent volume.
0 10 ft³
85.5 km²
300 cm²
Due to the fact that this is a generally used (unit)3, such as cubic centimeters, cubic inches, cubic feet, cubic meters, etc., volume is computed for three-dimensional objects and is therefore represented in cubic units or another format of writing cubic unit.
What quantities could be used to indicate volume? Due to the fact that this is a generally used (unit)3, such as cubic centimeters, cubic inches, cubic feet, cubic meters, etc., volume is computed for three-dimensional objects and is therefore represented in cubic units or another format of writing cubic unit.If the length or radius is expressed in cm.It is typically measured in terms of the liter (L), or 1.057 qt in conventional measurements, or the milliliter (mL), or 1/1000 of a liter, or roughly 0.0338 of an ounce.In and out of the laboratory, it is frequently measured using cylinders, flasks, pipettes, or syringes.As an illustration of volume, a learner could use a graduated cylinder to calculate the volume of a chemical solution in milliliters.You could purchase a quart of milk.To learn more about volume refer
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A___is a charged particle because it has more or fewer electrons than protons. When
an atom___an electron, it becomes a positively charged ion. When an atom___an electron, it becomes a negatively charged ion.
Answer:
1. ion
2. loses
3. gains/adds
Explanation:
An ion is an atom or group of atoms that has an electric charge. Ions with a positive charge are called cations. Ions with a negative charge are called anions.
When an atom is in neutral state, the number of protons = number of electrons
if an atom loses an electron, now electron count is less than the protons. (electrons < protons), hence it will be more positive.
if an atom gains or adds an electron, now electron count is more than the protons. (electrons > protons), hence it will be more negative.
Is my answer right ? I use what I know best
H-F is a dipole molecule.
Does H-F is a dipole molecule?H-F is a polar covalent molecule that exhibits dipole-dipole interactions. Because it contains an electronegative atom, F, which is bonded to a H atom, an H-bond exists between its molecules. Because of these H-bonds, -HF molecules exist in liquid form.
Because HF is a polar molecule, it exhibits both dispersion and dipole-dipole forces. However, hydrogen bonding is possible because a hydrogen atom is covalently bonded to a fluorine atom and the same hydrogen atom interacts with a fluorine atom on another HF molecule.
A polar bond exists between H and F. All other molecules have regular geometry and, as a result, have a zero dipole moment.
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Help please!! ill give brainliest
Answer:
What process formed this delta?
A.) erosion and deposition
Explanation:
You're welcome.
Answer:
Erosion and deposition
Explanation:
Erosion happens as a result of the washing away of the top soil and this usually goes along with the deposition of some particles; loose or fine, mainly sand. So yes, the answer is option a.
What is the volume in liters of 3.17 kg of ethylene glycol?
The volume in liters of 3.14 kg of ethylene glycol is 2.8288 L
What is Volume?A measurement of three-dimensional space is volume. It is frequently quantified numerically by various imperial or US customary units, SI-derived units, or both.
To find the volume:
Ethylene glycol density is: 1.11 g/cm³
m= 3.14 kg = 3140 g
v= ? L
v= m/d
= 3140g/1.11 g/cm³
=2828.8 cm³
= 2.8288 L
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Insulators ? thermal energy transfer.
Insulation is the process of constructing a barrier between hot and cold objects that prevents heat from transferring between them by either reflecting thermal radiation or reducing conduction and convection.
What reduces thermal energy transfer?
What is an insulator?The prevention of heat transfer between surfaces that are in thermal contact or within a radiative influence zone is known as thermal insulation. In addition to using the right item forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.
Thermal insulation prevents heat from moving from one substance to another when they are in thermal contact.
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9. Using the van der Waals equation, calculate the pressure exerted by 15.0 mol of carbon dioxide confined to a 3.00 L vessel at 56.0 C. Note: Values for a and b in the van der Waal equation: a = 3.59 L2.atm/mol, and b = 0.0427 L/mol.
Using the van der Waal equation, the pressure exerted by 15.0 mol of carbon dioxide confined to a 3.00 L vessel at 56.0 C is 81.95 atm.
What is the van der Waals equation?The van der Waals equation is given below as follows:
(P + a * n²/V²) (V - nb) = nRT
where:
P is pressure = ?
a = 3.59 L².atm/mol
b = 0.0427 L/mol.
V is volume = 3.00 L
n is the number of moles = 15.00 moles
R is molar gas constant = 0.0821 Latm/mol/K
T is the temperature in kelvin = (273 + 56) or 329 K
Substituting the values:
(P + 3.59 * 15²/3²) (3 - 15 * 0.0427) = 15 * 0.0821 * 329
(P + 89.75) = 171.7
P = 81.95 atm
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Determine the number of moles in 2.07 × 10²³ formula units of CaCl₂.
The number of moles in 2.07 × 10²³ formula units of CaCl₂ is 0.34 moles.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
1 mole of any molecule = 6.023 × 10²³ molecules
1 mole of CaCl2 = 6.023 × 10²³ molecules
Therefore,
2.07 × 10²³ molecules of CaCl2 1 mole / 6.023 × 10²³
= 0.34 moles
Thus, the number of moles in 2.07 × 10²³ formula units of CaCl₂ is 0.34 moles.
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HELPPP PLSS ILL GIVE U BRAINLIEST
Mountains can evolve in a variety of ways over time. They are susceptible to erosion from rain and wind, as well as landslides caused by flooding. Volcanic activity causes some mountains to change. They may also change as a result of earthquakes and tectonic plate movement.
What is volcanic activity ?A volcanic eruption occurs when lava and gas are expelled from a volcano, sometimes violently. A 'glowing avalanche,' which occurs when freshly erupted magma flows down the sides of a volcano, is the most dangerous type of eruption.
The heat from the mantle plume melts and thins the crust, resulting in surface volcanic activity.
Thus, In figure 3 there are two images one is millions of years ago and another is present day image. In both the images mountains are different because of erosion from rain and wind, as well as landslides caused by flooding.
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