Answer:
...
Explanation:
Which of the following best defines climate)_( Short-term atmospheric conditions of a region Ob The weather pattern of an area over two weeks or less Average weather conditions of a region over the long term Od A pattern of weather that never changes
Answer:
Average weather conditions of a region over the long term
Explanation:
Climate is the long-term average of weather, typically averaged over a period of 30 years. More rigorously, it denotes the mean and variability of meteorological variables over a time spanning from months to millions of years.
A 45.0 mL solution of 0.0450 M hydroxylamine is extracted with 125 mL of solvent. The distribution constant for the reaction is 5.00 and the pKa of the protonated form of hydroxylamine is 5.960. Calculate the concentration of hydroxylamine remaining in the aqueous phase at pH=4.50 and pH=6.50 .
Answer:
pH = 4.5, concentration = 0.045 M.
pH = 6.5, concentration = 0.175 M.
Explanation:
The ka for the can be calculated by using the formula below;
Ka = 10^-pka = 10^-5.960 = 1.1 × 10^-6
The concentration of hydrogen ion at pH = 4.50 can be calculated as given below;
{H^+ } = 10^-4.50 = 3.2 × 10^-5 M.
(NB=> 10 in this regards means the inverse of log).
The next step is to determine the distribution coefficient which can be calculated by using the formula below;
distribution coefficient = (partition coefficient) × ka / ka + ( concentration of Hydrogen ion,H^+).
distribution coefficient =( 5 × 1.1 × 10^-6 ) / 1.1 × 10^-6 + 3.2 × 10^-5 M. = 5.5 × 10^-6/ 3.2 = 0.00000171875
The fraction remaining from the compound = 45.0 mL / 45.0 mL + (0.00000171875 × 125).
= 0.999995.
Thus, the concentration at pH = 4.5 = 0.999995 × 0.0450 M = 0.045 M
(B). pH=6.50, thus the concentration of Hydrogen ion = 10^-6.5 = 3.2 × 10^-7 M.
distribution coefficient = (partition coefficient) × ka / ka + ( concentration of Hydrogen ion,H^+).
distribution coefficient = (5 × 1.1 × 10^-6)/ 1.1 × 10^-6 + 3.2 × 10^-7 M).
distribution coefficient = 5.5 × 10^-6/ 1.42 × 10^-6 = 3.9.
Therefore, the concentration = 3.9 × 0.0450 M = 0.175 M.
20.
Which of the following is an example of an analgesic?
- Aspirin
- Insulin
- Penicillin
- Cortisone
Answer:
Aspirin which is also considered as
NSAID
Explanation:
they are prescribed drugs
Among the given examples, aspirin is an example of an analgesic. The correct answer is option a.
Analgesics are a class of drugs that are used to relieve pain.
Aspirin is a non-steroidal anti-inflammatory drug (NSAID) that works by inhibiting the production of prostaglandins, which are chemicals in the body that cause pain and inflammation.
Aspirin is commonly used to treat mild to moderate pain, such as headaches, toothaches, and menstrual cramps. In addition to its analgesic properties, aspirin is also used as an anti-inflammatory and antipyretic (fever-reducing) agent.Therefore, the example of an analgesic is aspirin that is commonly used to relieve pain. Option a is the correct answer.
Learn more about Analgesics here:
https://brainly.com/question/17065064
#SPJ6
which charcoal Is used as gas mark absorbent
Answer:
where is the answers at
Explanation:
what does the word "local" mean
Answer:
belonging or relating to a particular area or neighborhood, typically exclusively so
Explanation:
A system includes:
а
objects that are interacting.
B the surrounding air.
C the surface or medium on which the objects rest.
D all of the above.
Module 1 Exam
Elicia
Chemistry A -
9. Water at which of the following temperatures would have particles with the greatest average kinetic energy?
O 50°C
O 100°C
O 10°C
0°C
Answer:
100°C
Explanation:
The higher temperature causes the molecules to increase in speed, and kinetic energy is greatest in the gas phase.
A solution containing HCI would likely have
a high pH and a low pOH.
a low pH and a high pH.
a high pH and a high poH.
a low pH and a low poH
Answer:
B on EDGE 2021
Explanation:
THE ANSWER ABOVE IS INCORRECT brainliest pls?
Given the solution containing HCl, the solution is likely to have a low pH and a high poH
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH scaleThe pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.
The scale ranges from 0 to 14 indicating:
0 to 6 indicates acid 7 indicates neutral 8 to 14 indicate basicHowever, it should be noted that as the pH increases, pOH decreases and as pH decreases, pOH increases.
Considering the question given above, the solution (HCl) is acidic.
Therefore, the solution will have a low pH and a high pOH
Learn more about pH:
https://brainly.com/question/3709867
. The earth’s diameter is 1.276 x 107 meters. How many yards is this?
Answer:
1.396 x [tex]10^{7}[/tex] yards
Explanation:
The Earth has a spherical shape, thus its diameter is a straight line that passes through its center; dividing into two equal halves.
Given that the diameter of the earth is 1.276 x [tex]10^{7}[/tex] meters.
But,
1 meter = 1.09361 yards
So that,
1.276 x [tex]10^{7}[/tex] meters = x
⇒ x = 1.276 x [tex]10^{7}[/tex] x 1.09361
= 1.39545 x [tex]10^{7}[/tex] yards
The diameter of the earth is 1.396 x [tex]10^{7}[/tex] yards.
Examine the following electron configuration:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p1
11) How many total electrons are there?
12) Which element is this?
13) How many electrons are in the fourth energy level of this element?
14) What is the valence electron configuration of this element?
15) How many electrons are in the outermost energy level?
Answer:
The answer to 12 is Indium... you should be able to figure out the rest from there with help from the internet since i've given you the element
Explanation:
I would usually do it but I got a ton of hw
What is the primary means through which the Sun warms Earth?
a
b
Fluctuation of subatomic particles.
Fluctuation of gravitational fields.
C Transfer of energy through conduction.
D Transfer of energy by electromagnetic waves.
Answer:
D
Explanation:
Radiation - radiation is transfer of energy by electromagnetic waves
The sun warms the earth through the transfer of energy by electromagnetic waves. Therefore, option (D) is correct.
What are electromagnetic radiations?Electromagnetic radiation contains waves of the electromagnetic field, which propagate through space and carry radiant energy. It includes microwaves, radio waves, infrared, (visible) light, UV, X-rays, and gamma rays.
Electromagnetic radiation posses of electromagnetic waves, which oscillate with the electric and magnetic fields. Electromagnetic waves are created due to periodic changes in the electric field or magnetic field.
Depending on the periodic change that happens and the power produced, different wavelengths of the electromagnetic spectrum are produced. The effects of electromagnetic radiation on chemical compounds and biological organisms depend on the power of the radiation and its frequency.
In order of increasing frequency and decreasing wavelength, these waves are arranged in the electromagnetic spectrum. The transfer of electromagnetic waves from the Sun to the earth, the energy of these waves warms the earth.
Learn more about electromagnetic radiation, here:
https://brainly.com/question/10759891
#SPJ6
What can be done to remove a magnetic force around an electromagnet
made of a coiled copper wire wrapped around an iron bar and connected to a
power source?
O A. Uncoil the wire.
B. Remove the iron bar.
C. There is always a small magnetic force around the wire.
D. Stop the current.
What is the effect of convection in the mantle on earths land formations?
Answer:
As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
a human skull is ?????
Answer:
part of the skeleton that supports the structure of face and forms a cavity from bone.
Hope it help u.
Explanation:
hope it is helpful to you
What are phytoplankton and what percentage of oxygen do they produce? (ASAP)
Answer:
They are plants also known as plankton and they produce about 80-85% of the world's oxygen.
Explanation:
Explain your thoughts on whether or not using solely IR is a good method to make positive IDs of chemicals.
Answer:
No, IR should not soely be used to identify molecules
Explanation:
IR is a method that identifies the functional groups in a molecule by deducing the frequency of stretching and vibration of bonds. Each peculiar type of bond has a frequency for the vibration of each bond represented on the IR spectrum.
However, one method is never enough to identify a compound. A combination of methods must always be used to clear up ambiguities arising from overlapping IR frequencies. Also, interpretation of the nuanced peaks of the fingerprint region in IR spectra is quite challenging and only gives a fair idea of the functional groups present in the compound.
Therefore other methods such as NMR, UV-VISIBLE etc should also be involved in the identification of compounds.
A cleaning product company is having trouble with the phi control of one of their products. The prod basic but the pH is too high What could the company try to correct the pH of the product? A. Increasing the amount of product in each container B. Diluting the contents of each container by adding water C. Allowing some water to evaporate from each container D. Adding drain cleaner from this activity to each container (tts)
Answer:
Option B.
Explanation:
Obviously, a cleaning agent companies is going to be a producer of cleaning agents which are chemical substance which are used for the main purpose of removing unwanted particles (dirt).
For this particular Question, option ''B'' is correct because upon the addition of H2O, there will surely be changes in the numbers of ions in the cleaning agents.
From the Question above, we have that the cleaning agents has pH which is too high, therefore in order to reduce the pH of the cleaning agents, water will be used to mix the product or cleaning agents. Upon the addition of water there will be decrease in OH^-.
What evidence would a scientist use to determine the age of rock in a layer?
Answer: They can find fossils and use a technology called radiocarbon to find the age of the fossil and then do an approximate about the age of the rock.
Explanation:
Of the metal ions tested, sodium produces the brightest and most persistent color in the flame. Do you think potassium could be detected visually in the presence of sodium by burning this mixture in a flame
When sodium is present, it is challenging to distinguish potassium because sodium causes the flame to have the most vivid and lasting color.
Spectra of Sodium and PotassiumSodium should be absent if we wish to distinguish the coloration of other metals. In the absence of sodium, potassium tints the flame violet. However, we were able to identify the existence of both ions using a spectroscope. Only a few brightly colored lines in the spectrum can be detected when the light produced by an element's atoms is observed in a spectroscope.
A given excited atom may only undergo energy changes of specific fixed, definite amounts, as evidenced by the fact that it only emits radiation at a limited set of fixed wavelengths.
These ions' emission spectra can be seen to consist of a number of lines when we use a spectroscope to look at them. Each metal's series is distinct. In contrast to sodium, potassium has a distinctive set of lines. Thus, both are distinguishable from one another.
To know more about the similar questions on 'spectroscope'
visit- https://brainly.com/question/2114494
#SPJ2
Select the atomic models that belong to the same element.
Answer:
top right and bottom left
Explanation:
just took test plato/edmentum
Write two advantages and two disadvantage of hydrogen
Rank the following from least to greatest electron affinity: Carbon (C), Nitrogen (N), Oxygen (O).
Group of answer choices
O < N < C
C < N < O
N < C < O
C < O < N
Answer:
C < N < O.
Explanation:
Hello!
In this case, since the electron affinity is a periodic property of elements indicating how likely is for the element to gain one electron, which is also related to the electronegativity, we can notice that fluorine is the most electronegative element or also, the element with the highest electron affinity whereas francium is the least electronegative element.
Therefore, we can infer that the electron affinity or electronegativity, increases from left to right and from bottom to top in the periodic table, it means that among carbon, nitrogen and oxygen, the element with the greatest electron affinity is oxygen, then nitrogen and finally carbon with the least one, thus answer is C < N < O.
Best regards!
DO NOT TROLL AND ANSWER WITHOUT THE CORRECT ANSWER! I EXPECT THE CORRECT ANSWER NOT A TROLL SO IF YOU DONT HAVE THE ANSWER DO NOT WRITE ANYTHING. IF YOU TROLL I WILL REPORT YOU
A weather balloon with a volume of 3.40774 L
is released from Earth’s surface at sea level.
What volume will the balloon occupy at an
altitude of 20.0 km, where the air pressure is
10 kPa?
Answer in units of L.
Answer: The volume occupied at an altitude of 20.0 km is 34.5289 L
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
where,
[tex]P_1[/tex] = initial pressure of gas = 101.325 kPa ( sea level)
[tex]P_2[/tex] = final pressure of gas = 10 kPa
[tex]V_1[/tex] = initial volume of gas = 3.40774 L
[tex]V_2[/tex] = final volume of gas = ?
Now put all the given values in the above equation, we get the final pressure of gas.
[tex]101.325\times 3.40774=10\times V_2[/tex]
[tex]V_2=34.5289L[/tex]
Therefore, the volume occupied at an altitude of 20.0 km is 34.5289 L
how to differentiate between methane and ethene gas
Assume a density of water of 1.00 g/mL, and calculate the mass of water in the solution
Answer:
1g or 10^-3kg
Explanation:
as you know , the density =mass \volume
so you have the mass from the number it self
[tex]\frac{1g}{1 ml}[/tex] so from this equation, you will get 1 g and you can to SI to be [tex]10^{-3}[/tex]kgThe properties of compund are different from the properties of their constituenr
Answer: Atoms of carbon and hydrogen
Explanation:
What two atoms are held together by a covalent bond in NaHCO3
Answer: covalent bond is the force of attraction that holds together two atoms that share a pair of valence electrons. Covalent bonds form only between atoms of nonmetals. The two atoms that are held together in a covalent bond may be atoms of the same element or different elements.
Explanation:
How does temperature effect the molecules of a substance that is dissolved.
Explanation:
Generally, temperature increases the rate of any chemical reaction considerably.
In a dissolution process, the solute is solvated in the solvent. Solutes are usually the solids or liquids being dissolved in the solution.
When temperature increases, the average kinetic energy of the solvent molecules increase also. The indicator of the average kinetic energy in a body is heat. As molecules begins to move rapidly, it brings both the solvent and solute in contact faster with each other.When the absolute value of the difference in electronegativity of two adjacent atom in a compound is 1, they are most likely bonded by:____________.
a. nonpolar covalent bond
b. a polar covalent bond
c. ionic bonding
Answer:
A polar covalent bond
Explanation:
When the absolute value of the difference in electronegativity of two bonded atoms is between 0.4 and 1.8 they tend to form polar covalent bonds.
Copper coins turn green when exposed to water. What happens to this chemical reaction if the coins are heated?
1.The coins will turn green slower because chemical reactions slow down with higher temperatures
2.The coins will turn green faster because chemical reactions speed up with higher temperatures
3.The coins will turn green at the same rate as before because temperature has no affect on the speed of chemical reactions
4.The coins will not turn green, algae cannot survive in hot temperatures
Answer:
The coins will turn green faster because chemical reaction speed up with higher temperatures
Copper coins turn green when exposed to water because the coins will turn green faster because reaction speeds up with higher temperatures.
What is the rate of the chemical reaction?The rate of a chemical reaction can be defined as the speed at which the products are formed from the reactants. The rate of a reaction gives information about the time frame under which a reaction can be finished.
The rate of reaction can be described as the speed of a chemical reaction at which reactants are transformed into products. Some chemical reactions are generally instantaneous, while some reactions take time to reach the final equilibrium. Pressure increases the concentration of gaseous reactants resulting in an increase in the rate of reaction.
The rate of reaction will increase with an increase in the temperature of the reaction as the reactant molecules get more kinetic energy and increase the number of collisions.
Therefore, copper coins will turn green faster because reactions speed up with higher temperatures.
Learn more about the rate of reaction, here:
brainly.com/question/13571877
#SPJ2