Read the passage. Oceans and seas can act as a buffer heat reservoir to regulate climates. They can absorb great quantities of heat in the summer, with very little temperature change. In the winter, oceans and seas release the heat. This is the main reason why coastal climates are milder compared to terrestrial climates. Which choice correctly explains this phenomena? A) the high freezing point of water caused by the strength of O–H bonds B) the high boiling point or water caused by hydrogen bonding C) the high heat of vaporization of water caused by the strength of O–H bonds D) the high specific heat of water caused by hydrogen bonding
Answers
Answer:
D) the high specific heat of water caused by hydrogen bonding
Explanation:
The water has a higher specific heat and is due to the bonding of H2 molecules by the water. When the bonding is broken the heat is released and water molecules can move freely. This leads to a decline in the temperatures and thus the heat is released in winters and coastal climates are considered to be milder than terrestrial climates. As the energy is released on condensation.Related Questions
Can radiation take place in solids, liquids, and gasses?
Answers
Answer:
Yes!
Explanation:
Liquids & gases are poor conductors, but they can make heat (thermal energy) travel quickly from one point to another. ... ~ When waves of heat (thermal energy) travel through empty space and transparent mediums, heat transfer by radiation occurs. Solids, liquids, & gases can all be heated by radiation.
Bye Have A Nice Day!you have to prepare a ph 3.55 buffer, and you have the following 0.10m solutions available: hcooh , ch3cooh , h3po4 , hcoona , ch3coona , and nah2po4 . how many milliliters of hcooh and hcoona would you use to make approximately a liter of the buffer?
Answers
To make approximately a liter of pH 3.55 buffer, you would use 8.6 mL of 0.10 M HCOOH and 13.7 mL of 0.10 M HCOONa. We would use x mL of 0.10 M HCOOH and 0.4x mL of 0.10 M HCOONA to make approximately a liter of pH 3.55 buffer.
To prepare a pH 3.55 buffer using the available 0.10 M solutions of HCOOH (formic acid) and HCOONa (sodium formate), you can use the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
For formic acid (HCOOH), the pKa is approximately 3.75. We can rearrange the equation to find the ratio of [A-]/[HA]:
3.55 = 3.75 + log([HCOONa]/[HCOOH])
log([HCOONa]/[HCOOH]) = -0.20
[HCOONa]/[HCOOH] = 10^(-0.20) ≈ 0.63
Now, to make approximately a liter of buffer with a 0.10 M concentration, we can use the following:
0.10 L * (x + y) = 1 L
Since the ratio of [HCOONa]/[HCOOH] is 0.63, we can write:
x = 0.63y
Substitute x in the first equation:
0.10 L * (0.63y + y) = 1 L
0.73y = 10 L
y ≈ 13.7 L
Then, x ≈ 0.63 * 13.7 L ≈ 8.6 L
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who was a synthetic organic chemist that successfully synthesized physostigmine ?
Answers
The synthetic organic chemist who successfully synthesized physostigmine was Robert Burns Woodward.
He was an American organic chemist who is considered by many to be the preeminent organic chemist of the twentieth century. Woodward's synthesis of physostigmine, an alkaloid found in the Calabar bean, was an important milestone in modern organic chemistry. Physostigmine works by obstructing acetylcholine metabolism. The enzyme that breaks down acetylcholine in the synaptic cleft of the neuromuscular junction, acetylcholinesterase, is inhibited in a reversible manner by this substance.Woodward's method of synthesizing physostigmine was the first successful total synthesis of a complex natural product, and it established the precedent for modern organic synthesis.
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c. units of volume to units of
length.
d. units of length to units of
volume.
13.A student determined the density of
aluminum by averaging the
results of three density
calculations. Each value was
different, but the average was
equal to the accepted value for
aluminum's density. The results
of this investigation are best
described as
a. accurate, but not precise.
b. precise, but not accurate.
c. both precise and accurate.
d. neither precise nor accurate.
14. Neutral atoms contain equal numbers
of
a. electrons and neutrons.
b. protons and neutrons.
c. protons and electrons.
d. protons, electrons, and
neutrons.
15. An atom of potassium has 19 protons
and 20 neutrons. Its mass
number is
a. 9.
b. 19.
c. 20.
d. 39.
16. The isotope uranium-235 has 92
protons and 143 neutrons.
Therefore, its mass number
a. 92.
b. 235.
c. 143.
d. impossible to determine.
Answers
13.A student determined the density of aluminum by taking average of the results of three density calculations. Each value was different, but average was equal to the accepted value for density of aluminum. The results of investigation are described as a.) accurate, but not precise.
What is mass number?
The total number of protons and neutrons in an atom is known as the mass number. It is calculated by adding the number of neutrons and the number of protons together .
14.Neutral atoms contain equal numbers of c.) protons and electrons.
15. An atom of potassium has 19 protons and 20 neutrons. Its mass number is d.) 39. As we know that, mass number = Number of protons + number of neutrons. Hence, 19 + 20 = 39
16.The isotope uranium-235 has 92 protons and 143 neutrons. Therefore, its mass number b.) 235.
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Which of the following signs of a chemical reactioi
are observed in the reaction of potassium with
water?
precipitate formed
temperature change
smell produced
gas produced
color change
The answer is temperature change, gas produced, and color change
Answers
Answer:
temperature change
color change
Gas produced
Answer:
B: temperature change
D: gas produced
E: color change
How are the phases of matter distinguished from one another?
Answers
Answer:
Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. Gas are well separated with no regular arrangement. Liquid are close together with no regular arrangement. Solid are tightly packed, usually in a regular pattern.
Explanation:
Determine the mass of zirconium_______________, silicon__________________, and oxygen________________, found in 0.3384 mol of zircon, ZrSiO4, a semiprecious stone. Your answer must have the correct number of significant figures.Enter the number only, with no units.
Answers
1) Determine the mass of zirconium
Convert moles of zircon into moles of zirconium
\(\text{molesofZr}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofZr}}{1molofZrSiO_4}=0.3384\text{molesofZr}\)Convert moles of zirconium into mass of zirconium (g)
\(\text{gramsofZr}=0.3384\text{molesZr}\cdot\frac{91.224\text{ g Zr}}{1\text{molofZr}}=30.87\text{ g Zr}\)2) Determine the mass of Silicon
Convert moles of zircon into moles of silicon
\(\text{molesofSi}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofSi}}{1molofZrSiO_4}=0.3384\text{molesofSi}\)Convert moles of silicon into mass of silicon (g)
\(\text{gramsofSi}=0.3384\text{molesofSi}\cdot\frac{28.085\text{ g of Si}}{1\text{molofSi}}=9.504\text{ g Si}\)3) Determine the mass of Oxygen
Convert moles of zircon into moles of oxygen
\(\text{molesofO}=0.3384molesofZrSiO_4\cdot\frac{4\text{molofO}}{1molofZrSiO_4}=1.3536\text{molesofO}\)Convert moles of oxygen into mass of oxygen
\(\text{gramsofO}=1.3536\text{molesofO}\cdot\frac{15.999\text{ g O}}{1\text{mol of O}}=21.66gO\)The mass of zirconium is 30.87 g
The mass of silicon is 9.504 g
The mass of oxygen is 21.66 g
if you increase the concentration of an base, what changes in both types of bases?
Answers
Answer: Increasing the concentration of a base will cause the pH level of the solution to increase. Increasing the concentration of an acid will cause the pH level of the solution to decrease.
Explanation:
What is the formula unit for the ionic bond between Sodium (Na) and Phosphorus (P)?
Na P
Answers
The ionic bond between Na and P has formula unit Na3P.
What is the formula unit?
Formula units is the chemical formula which gives all the ions present in the lowest ratio possible to make it neutral charge of an ionic compound. For example, the formula unit for sodium chloride can be written as NaCl where charge on Na is +1 and charge on Cl is -1. So to make it neutral they can be cancelled and written as NaCl.
In sodium phosphide, the charge on Na (sodium) ion is +1 and the charge on the P (phosphorous) ion is -3. Therefore, make the charges neutral, 3 Na ions need to be added to 1 P ion. Formula units can be used to describe or represent the molecules or the elements which make up a substance.
Hence, Na3P is the formula unit of Na and P in sodium phosphide.
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6 points
6. According to this equation, how many moles of Ag, S will be produced
from 20 moles of Ag? (Assume H S and O, are in excess). *
-
4Ag + 2H2S + O2 → 2A82S + 2H20
O A. 20 moles
O B. 10 moles
O C. 5 moles
O D. O moles
Answers
Answer:
I think it’s 7.0 moles of water.
Explanation:
gj
For a given reaction, Kc is the equilibrium constant based on the molar _____ of reactants and products while Kp is the equilibrium constant based on the partial _____ of reactants and products.4HCl + MnO2 <-> MnCl2 + 2H2O +Cl2
Answers
For a given reaction, Kc is the equilibrium constant based on the molar mass of reactants and products while Kp is the equilibrium constant based on the partial pressure of reactants and products.
The chemical reaction is given as,
4HCl + MnO₂ → MnCl₂ + 2H₂O +Cl₂
Generally, for a chemical reaction, the equilibrium constant can be usually defined as the ratio between the amount of reactant and the amount of product which is often used to determine the chemical behavior. Equilibrium constant is denoted as Kc.
Kp is defined as the equilibrium constant which is calculated from the partial pressures of a reaction equation. Kp is used to express the relationship present between product pressures and reactant pressures.
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A human zygote has 46 chromosomes. This number of chromosomes represents what in a human cell?
Answers
If AH° for the reaction 2X --> 4Y is -112 kJ/mol, what is the value for the reaction 2Y --> X sign for the reaction below:
H2(g) + Cl2(g) --> 2 HCl(l)
a. 56 kJ
b. -56 kJ
c. 112 kJ
d. -224 kJ
Answers
The given reaction is an exothermic reaction as it releases heat, and the value of AH° is -112 kJ/mol.
The given reaction is an exothermic reaction as it releases heat, and the value of AH° is -112 kJ/mol. This means that for the formation of 4 moles of Y, the reaction releases 112 kJ of heat. Now, we have to find the value of the reaction when 2 moles of Y form X. The given reaction is not directly related to the required reaction, so we have to use the Hess's law. According to Hess's law, the heat of a reaction is independent of the pathway taken and depends only on the initial and final states of the reactants and products.
Thus, to find the value of 2Y --> X, we can reverse the given reaction and divide its AH° by 2. The reversed reaction would be X --> 2Y, and its AH° would be +112 kJ/mol. Dividing this value by 2, we get +56 kJ/mol. Since the reaction is endothermic, the sign of the value would be positive, and the correct option is a. 56 kJ.
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How much water is needed to make 7.2moles of glucose?\(6CO2 + 6H2O -\ \textgreater \ C6H12O6 + 6O2\)
Answers
Approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.
The balanced equation provided is:
6CO2 + 6H2O -> C6H12O6 + 6O2
From the equation, we can see that for every 6 moles of water (H2O), 1 mole of glucose (C6H12O6) is produced. Therefore, we need to determine the amount of water required to produce 7.2 moles of glucose.
The mole ratio between water and glucose is 6:1. This means that for every 6 moles of water, we obtain 1 mole of glucose. To find the amount of water needed for 7.2 moles of glucose, we set up a proportion using the mole ratio:
(6 moles H2O / 1 mole glucose) = (x moles H2O / 7.2 moles glucose)
Solving for x, we can cross-multiply:
6 moles H2O * 7.2 moles glucose = x moles H2O * 1 mole glucose
43.2 moles H2O = x moles H2O
Therefore, we need 43.2 moles of water to produce 7.2 moles of glucose.
To convert moles of water to grams, we need to know the molar mass of water, which is approximately 18 g/mol. Using the molar mass, we can calculate the mass of water needed:
Mass of water = moles of water * molar mass of water
Mass of water = 43.2 moles * 18 g/mol
Mass of water = 777.6 g
Therefore, approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.
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What is the average atomic mass of 38 atoms of Copper-65 and 92 atoms of Copper-63?
Answers
Convert 2.50 mol Na2SO4 to mass of NaOH. Please round your answer to two digits after the decimal point and don't forget units and substance!
CaSO4 + 2 NaOH --> Na2SO4 + Ca(OH)2
Answers
When we convert 2.50 moles of Na₂SO₄ to mass of NaOH, given the chemical equation, the result obtained is 200 grams
How do I i convert 2.50 moles of Na₂SO₄ to mass of NaOH?We'll begin by obtaining the moles of NaOH that reacted to produce 2.50 moles of Na₂SO₄. Details below:
CaSO₄ + 2NaOH -> Na₂SO₄ + Ca(OH)₂
From the balanced equation above,
1 mole of Na₂SO₄ was produced from 2 moles of NaOH.
Therefore,
2.50 moles of Na₂SO₄ will be produce from = 2.5 × 2 = 5 moles of NaOH.
Finally, we shall determine the mass of NaOH. Details below:
Mole of NaOH = 5 moles Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol Mass of NaOH =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of NaOH = 5 × 40
Mass of NaOH = 200 grams
Thus, the mass of NaOH is 200 grams
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You plan to use the water displacement method to
determine if a ring is pure silver. Each of these tools Is
required, EXCEPT
A balance
A stopwatch
A measuring cup filled with water
A density of elements chart
Answers
Answer: A stopwatch
Explanation:
You don’t needed
A student requires all of them except a balance. The correct option is A.
What is the water displacement method?Students calculate the volume of various rods that have the same mass using the water displacement method. Each rod's density is calculated, and the distinctive densities of each material are used to distinguish the five rods.
Then, to explain why various rods have varied densities, students think about the connection between the mass, size, and arrangement of atoms. The periodic table will be briefly introduced to the class.
The volume displacement method is often used to determine the volume of an object with an irregular shape. This technique involves submerging an object into a known amount of water; as a result, the water level will rise.
Therefore, A student requires all of them except a balance. The correct option is A.
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by chemical analysis, what nutrient is present in the highest amounts in most foods?
Answers
The nutrient that is present in the highest amounts in most foods is carbohydrates. Carbohydrates provide the body with energy and are found in a wide variety of foods, including fruits, vegetables, grains, and dairy products.
Carbohydrates are one of the three macronutrients that are essential to human health, along with protein and fat. They are composed of sugars, starches, and fibers and are broken down into glucose, which the body uses as its primary source of energy.
Carbohydrates are found in a wide range of foods, from simple sugars found in fruits and honey to complex carbohydrates found in grains and vegetables.
Carbohydrates are especially abundant in foods such as bread, pasta, rice, and potatoes, which are staples in many diets around the world. Dairy products, such as milk and yogurt, also contain carbohydrates in the form of lactose.
Fruits and vegetables are also good sources of carbohydrates, as they contain natural sugars and fibers that help to regulate blood sugar levels and support digestive health.
While carbohydrates are an important source of energy, it is important to consume them in moderation and to choose complex carbohydrates over simple sugars whenever possible.
This can help to prevent spikes in blood sugar levels and support overall health and wellbeing.
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____is the degree of hotness or coldness of a body or place
Answers
What is
metal refinning
Answers
Answer:
It is the way of cleaning of impurities present in metals
if 4.50 ml of s2o32- titrant is used in titrating a water sample, how many mg o2/l was found in the sample?
Answers
The quantity of s2o3 used in titrating a water sample is 4.5 ml
Then the quantity of O2 found in the sample will be according to the reaction:
S2O3 + I2 -> S2O6 + O2
If the quantity of titrate here is assumed to be 5 ml then the quantity of oxygen will be
5/4.5 ml = 1.111 ml of oxygen
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On Eagle Mountain (the highest point in Minnesota), you weigh ____ when you travel the 15 miles to get to Lake Superior's shore.
Question 2 options:
less than
the same as
more than
all of the above
Answers
If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.
What is weight?The weight of an object is the product of the mass and the acceleration due to gravity. The acceleration due to gravity of an object is the impact owing to the fact that the object lies within the earth's gravitational field.
If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.
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Which element is it more difficult to take electrons from? Tin or Gallium ? Explain why? You
Answers
The reason is gallium has a higher ionization energy. Ionization energy is the energy needed to take an electron from an atom. On the period table, the ionization energy tends to increase as you go across a period and decrease when you go down a group.
which column has fewer theoretical plates? column 1 column 2 they are the same. which column has a smaller plate height? column 1 column 2 they are the same. which column gives higher resolution? column 2 column 1 they are the same. which column gives a greater separation factor (adjusted relative retention)? column 2 they are the same. column 1
Answers
a. Column 1
b. Column 2
c. Column 1
d. Same
e. Column 2
f. Column2
According to the question:
a. Because the geometry of the peaks reflects the number of theoretical plates, Column 1 has more theoretical plates. In comparison to columns with fewer theoretical plates, those with more theoretical plates produce peaks that are higher and narrower.
b. Because Column 2 measures the effectiveness of a chromatography column by comparing its height to a theoretical plate, or plate height H, it has a higher plate height.
c. The capacity to distinguish between two signals called resolution in general. This pertains to the capacity to distinguish between two peaks in chromatography. The resolution is therefore higher in Column 1.
d. The relative affinities of the substances for the stationary and mobile phases determine the rates of migration of the substances during chromatographic processes. In comparison to solutes more strongly attracted to the mobile phase, those more strongly attracted to the stationary phase are held back. Thus, the relative retention for both columns is the same.
e. In chromatography, K' (K prime, or capacity factor) is used to determine whether a peak will produce repeatable and linear results over time. As a result, there is minimal risk of minor pH or mobile phase inaccuracies having a significant effect on peak retention or responsiveness. The equation is k = (Tr - To)/To. In this case, Column 2's capacity factor is higher.
f. When two concentrations are in equilibrium, a substance's concentration in one medium or phase (C1) is equal to its concentration in the other (C2), hence the partition coefficient is defined as (C1/C2) equilibrium. C1 and C2 may have separate unit systems. Column 2 has a higher partition coefficient in this instance.
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Sugar C12 H22 011 can be classified as a element, heterogeneous mixure, solution, compound
Answers
Answer:
The answer is a compound.
it is a compound as it contains different elements
Explanation:
Find the volume of 5.74 grams of NO2 (Hint: use two factors)
Answers
Answer:
1.2 cm^3
Explanation:
5.74 grams of a something occupies a volume of 1.2 cm^3 .
Which economical systems do you most agree with and why
Answers
Answer:
be specific it's too little information
what is the melting point of benzoic acid that you determined? how does this compare to the literature value?
Answers
The melting point determined of benzoic acid is in range of 121-123 °C.
Melting point determination of different elements helps to understand the purity of a substance. A pure substance has a melting range of one or two degrees but the range of melting of impure substances is much higher than the pure substance. The melting point also depends on the structure of the molecule.
A melting-point apparatus is a scientific instrument used to determine the melting point of a substance.
Pure benzoic acid has a melting point range of 121-123 °C. If benzoic were contaminated with an impurity, the melting point range might decrease and broaden to 117-120 °C.
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identify the empirical formula. please choose the correct answer from the following choices, and then select the submit answer button. answer choices A. b2cl2B. b4h10C. na2po4D. al2cl6
Answers
The empirical formula represents the simplest whole number ratio of atoms in a compound. To identify the empirical formula, we need information about the composition of the compound in terms of the elements present. Among the given answer choices, the correct empirical formula is B. b4h10, representing the compound boron tetraboride.
To determine the empirical formula, we consider the ratios of the different elements present in the compound. Let's evaluate the answer choices:
A. b2cl2: This represents a compound with boron (B) and chlorine (Cl). The ratio of boron to chlorine is 2:2, simplifying to 1:1. The empirical formula for this compound would be BCl.
B. b4h10: This compound consists of boron (B) and hydrogen (H). The ratio of boron to hydrogen is 4:10, which simplifies to 2:5. Thus, the empirical formula for this compound is B2H5.
C. na2po4: This compound includes sodium (Na), phosphorus (P), and oxygen (O). The ratio of sodium to phosphorus to oxygen is 2:1:4, which is already in its simplest form. Therefore, the empirical formula for this compound is Na2PO4.
D. al2cl6: This compound contains aluminum (Al) and chlorine (Cl). The ratio of aluminum to chlorine is 2:6, which simplifies to 1:3. Hence, the empirical formula for this compound is AlCl3.
Among the given answer choices, the compound with the empirical formula B2H5 is the correct option.
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Use the information from the article to answer the question. why is pluto now called a dwarf planet?
Answers
Answer:
coz it doesn't meet the three criteria the iau uses to define a full sized planet
Explanation:
it meet all other except one :has no cleared its neighboring region of other object