Answer:
Paleoclimatology
Step by Step explanation:
is the study of climate records from hundreds to millions of years ago. Information for paleoclimate studies come from natural records rather than instruments: these indirect records of climatic conditions are called proxy records. Coring a tree to gain access to tree ring data.
When a car uses a gallon of gas, how much carbon dioxide is emitted into the environment? I give branlyest
Answer:
19.5
Please tell me if wrong.
When a car uses a gallon of gas, 22.0 miles per gallon of carbon dioxide is emitted into the environment.
What happens when carbon dioxide is emitted?After being released into the atmosphere, carbon dioxide (CO₂) is initially quickly dispersed among the atmosphere, the upper ocean, and plants.
The sources of carbon dioxide emissions include both natural and human activities. Decomposition, oceanic discharge, and respiration are examples of natural sources.
The annual carbon dioxide emissions from a typical passenger automobile are around 4.6 metric tonnes. This estimates that the typical gasoline car on the road today gets roughly 22.0 miles per gallon of fuel and travels about 11,500 miles annually.
Thus, 22.0 miles per gallon of carbon dioxide is emitted into the environment.
To learn more about the carbon dioxide, follow the link;
https://brainly.com/question/3049557
#SPJ6
If you have 500 mL of a 0.10 M solution of the acid, what mass of the corresponding sodium salt of the conjugate base do you need to make the buffer with a pH of 7.74 (assuming no change in volume)
Answer:
5.90g of NaClO are needed
Explanation:
Assuming the weak acid is HClO pKa = 7.54
To solve this question we must use the H-H equation for acids:
pH = pKa + log [A-] / [HA]
Where pH is the pH we want = 7.74
pKa is pKa of the weak acid = 7.54
[A-] could be taken as the moles of the conjugate base (Moles NaClO) and [HA] moles weak acid = 0.500L * (0.10mol/L) = 0.0500 moles HClO
Replacing:
7.74 = 7.54 + log [NaClO] / [0.0500 moles]
0.20 = log [NaClO] / [0.0500 moles]
1.5849 = [NaClO] / [0.0500 moles]
Moles NaClO = 0.0792 moles
The mass is: -Molar mass NaClO = 74.44g/mol-
0.0792 moles * (74.44g / 1mol) =
5.90g of NaClO are needed5.90g of NaClO mass of the sodium salt of the conjugate base are need to make the buffer with a pH of 7.74.
What is pH?pH tells the solution is acidic or basic. pH means potential hydrogen.
Given,
Assuming the weak acid is (hypochlorous acid) HClO
pKa = 7.54
[tex]pH = pKa + \dfrac{ log[A-] }{ [HA]}[/tex]
(Moles NaClO) and [HA] moles weak acid = 0.500L * (0.10mol/L) = 0.0500 moles HClO
Putting the value
[tex]7.74 = 7.54 + \dfrac{ log[NaClO] }{ [0.0500 moles]}\\0.20 =\dfrac{ log}{[0.0500 moles]} \\1.5849 =\dfrac{ [NaClO]}{Moles\;of\; NaClO } = 0.0792 moles[/tex]
The mass is
Molar mass NaClO
= 74.44g/mol - 0.0792 moles * (74.44g / 1mol)
=5.90g of NaClO are needed
Thus, 5.90g of NaClO are needed.
Learn more about pH, here:
https://brainly.com/question/15289741
A sample of O2 with an initial temperature of 50.0 oC and a volume of 105 L is cooled to -25 oC. The new pressure is 105.4 kPa and the new volume is 55.0 L. What was the initial pressure of the sample? Show your work, using the G.U.E.S.S. method.
Answer:
71.92 kPa
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (kPa)
P2 = final pressure (kPa)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
T1 = 50°C = 50 + 273 = 323K
V1 = 105L
T2 = -25°C = -25 + 273 = 248K
P2 = 105.4 kPa
P1 = ?
V2 = 55.0 L
Using P1V1/T1 = P2V2/T2
P1 × 105/323 = 105.4 × 55/248
105P1/323 = 5797/248
0.325P1 = 23.375
P1 = 23.375 ÷ 0.325
P1 = 71.92 kPa
2KOH + H2SO4 → K2SO4 + 2H20
What mass of water would be produced if 19.6g of KOH were reacted?
19.6 × ( 1 mol KOH / 56 grams KOH )
= 0.35 mol KOH
_________________________________
0.35 mol KOH ×( 2 mol H2O / 2 mol KOH )
= 0.35 mol H20
_________________________________
0.35 mol H2O × ( 18 g H2O / 1 mol H2O )
= 6.3 grams H2O
Guys pls HELP ME PLS I WOLL GIVE BRAINLIEST PLS
Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?
Answer:
Explanation:
Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant). For example, the latent heat of fusion of one kilogram of water, which is the amount of heat energy that must be supplied to convert 1 kg of ice without changing the temperature of the environment (which is kept at zero degrees celsius) is 333.55 kilojoules
The latent heat of fusion of a substance also accounts for the energy required to accommodate any increase in the volume of the substance post the change of its physical state. The temperature at which the substance undergoes the phase transition is called the melting point of the substance. Unless specified to be otherwise, the pressure of the environment (when expressing the latent heat of fusion of a substance) is always assumed to be 1 atmosphere of pressure (which is roughly equal to 101.325 kilopascals).
An oxide of nitrogen contain its own volume of nitrogen
its vapour dentity is 22. Find the molecular formula
Of nitrogen Oxide
Answer:
NO2 is the molecular formula of nitrogen Oxide
Explanation:
Correct question
An oxide of nitrogen contain its own volume of nitrogen
its vapour dentity is 23. Find the molecular formula
Of nitrogen Oxide
Solution
As we know
Molecular Weight is equal to two times the vapour density
Hence, the molecular weight of Oxide of nitrogen is 2 * 22 = 44
Molecular weight of Oxide of nitrogen is the sum of atomic weight of nitrogen and oxygen
Molecular weight of Oxide of nitrogen = 14 + 16 *Y
14 + 16 *Y = 46
Y = 2
Hence, the formula is NO2
Which is the best example of a compound?
Gold
Ohydrogen peroxide
Air
ocean water
pls asap
Answer:Hydrogen Peroxide or Ocean Water
Explanation:
-H2O2 is compound with 2 elements hydrogen and oxygen.
-Salt water acts as if it were one substance even though it contains two substances salt and water.
-Gold is just an element Au
-Air is just oxygen
What are three advantages of renewable energy?
what is atom
what is atom
Answer:
An atom is a chemical substance which exist freely in nature without any reaction .
Explain why for static electricity to occur between two surfaces that are rubbed against each other, one of the materials has to be an insulator
When two surface come in contact and rub each other a frictional force causing them s deformation and this leads to a voltage giving rise to a static charge.
What is static charge?Static charge is developed within a body temporarily with an induced polarization. These charges are not moving and set into a pole in the material.
When two materials rub against each other in which one is a conductor and other to be an insulator, they will attract by the induced polarization. Rubbing causes the free electrons in the condutor to be transferred towards the insulator.
This will cause a deformation that, the random charges in the material get polarized where the electrons in the insulator will repel to the opposite pol and positive charges will align in a pole close to the condutor.
This charge separation causes the positive pole of the insulator gets attracted into the conductor surface. Hence, there forms a static electricity by the passage of electron.
To find more on static electricity, refer here:
https://brainly.com/question/12791045
#SPJ5
what physical and social systems are involved in the service industry
Answer:
Hey mate.....
Explanation:
This is ur answer........
For example, the communications industry includes all of the physical and social systems that produce books, newspapers, magazines, radio and television broadcasts, billboard advertisements, Internet websites, telephones, and telecommunications, such as the GPS.
Hope it helps!
Brainliest pls!
Follow me! :)
How do you convert from grabs to moles of a substance
1. Divide by the molar mass
2. Subtract the molar mass
3. Add the molar mass
4. Multiple by the molar mass
PLEASE HELP !!!
The correct question is as follows:
How do you convert from grams to moles of a substance
1. Divide by the molar mass
2. Subtract the molar mass
3. Add the molar mass
4. Multiple by the molar mass
Answer: In order to convert from grams to moles of a substance divide by the molar mass.
Explanation:
The number of moles of a substance is the mass of substance in grams divided by its molar mass.
The formula to calculate moles is as follows.
[tex]Moles = \frac{mass}{molar mass}[/tex]
This means that grams are converted to moles when grams is divided by molar mass.
Thus, we can conclude that in order to convert from grams to moles of a substance divide by the molar mass.
What is the rate of diffusion of NO gas to CO gas?
Answer:
0.97
Explanation:
Let R₁ represent the rate of diffusion of NO.
Let R₂ represent the rate of diffusion of CO.
Molar mass of NO (M₁) = 14 + 16 = 30 g/mol
Molar mass of CO (M₂) = 12 + 16 = 28 g/mol
Thus, the rate of NO to CO can be obtained as follow:
R₁ /R₂ = √(M₂/M₁)
R₁ /R₂ = √(28/30)
R₁ /R₂ = √(28/30)
R₁ /R₂ = 0.97
R₁ : R₂ = 0.97
NO : CO = 0.97
Therefore, the rate of diffusion of NO to CO is 0.97
How much energy required to raise the temperature of lead by the same degrees.
Answer:
If a one kilogram block of lead absorbs 2,000 J of energy then the temperature rise will be larger. If 1,000 J of heat is absorbed by a 2 kg block of lead then the temperature of the block doesn't rise as much since the energy is shared between more particles.
Explanation:
HELP ASAP!!! #2 only please.
Answer:
friend me on here and imma send you the link Explanation:
Electrical charge of an alpha particle is,
A. +1
B. +2
C. +3
D. +4
How do you think the human population has changed over time? What makes you say that?
Answer:The world population increased from 1 billion in 1800 to 7.7 billion today. The world population growth rate declined from 2.2% per year 50 years ago to 1.05% per year. Other relevant research: World population growth – This article is focusing on the history of population growth up to the present.
Explanation:
PLEASE PLEASE HELP CHEMISTRY
Sulfur (2.56 grams) was burned in a calorimeter with excess 02(g) . The temperature increased from 21.25C to 26.72C. The bomb had a heat capacity of 923 J/C, and the calorimeter contained 815 grams of water
Calculate the heat evolved as the sulfur burned:
Calculate the heat per mole of SO2 formed in the course of the reaction
S(s) + O2 (g) SO2 (g)
Global average temperature increases when energy absorbed by the surface ___?
increases
decreases
remains the same
Answer:
Increases
Explanation:
The main reason of increase earth's temperature is the increase of CO2 gas in the air which causes global warming and the ice burgs in the poles are getting melted and it results in the increase of the sea water level.
This is the main our problem in the future.
Energy that is made from the power of moving water
a
b
ОООО
wind
hydroelectric
coal
с
d
biomass
Hydroelectric energy is produced.
Describe the concept of using radioactive elements to establish an age for a fossil. Be sure to include how the parent and daughter elements are used in the determination of age. Answer in 1 paragraph.
Answer:
The nuclear decay of radioactive elements is a process that is a useful tool for determining the absolute age of fossils and rocks. It is used as a clock, in which daughter elements or isotopes converted from parent isotopes by decaying at a particular time.
Radioactive decay rates are constant and do not change over time. It is measured in half-life. A half-life is a time it takes half of a parent isotope to decay and converted into a stable daughter isotope. How many parent isotopes and daughter isotopes present in the fossil or their abundance can help in determining the age of fossil or rock.
An ideal gas is contained in a cylinder with a volume of 5.0x102 mL at a temperature of 30°C and a pressure of 710. Torr. The gas is then compressed to a volume of 25 mL, and the temperature is raised to 820° C. What is the new pressure of the gas?
Answer:
51207 torr is the new pressure of the gas
Explanation:
We can solve this question using combined gas law that states:
P1V1T2 = P2V2T1
Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of the gas
Computing the values of the problem:
P1 = 710torr
V1 = 5.0x10²mL
T1 = 273.15 + 30°C = 303.15K
P2 = ?
V2 = 25mL
T2 = 273.15 + 820°C = 1093.15K
Replacing:
710torr*5.0x10²mL*1093.15K = P2*25mL*303.15K
3.881x10⁸torr*mL*K = P2 * 7.579x10³mL*K
P2 = 51207 torr is the new pressure of the gas
Can someone please explain this to me t,t
I could do the second part if i just understood the first-
Answer:
Theoretical 32.04 g
The precent yeild 87. 39 %
Explanation:
Mole of H2 = m/mw = 4/2 = 2 mol
From the equation
1 mol H2 --> 1/2 mol CH3OH
2 mol H2 -->??
So we have 1 mol Ch3oh
Mass of Ch3oh = mole *Mw = 1* 32.04
= 32.04g >>> the theoretically
For percent yeild = actual / theoretical * 100%
( 28.0/32.04) *100% =
87.93%
what is chemical bonding?and types of chemical bonding there are?
Answer:
There are three primary types of bonding: ionic, covalent, and metallic. Ionic bonding. Definition: An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell. Example: A typical ionically bonded material is NaCl (Salt).Explanation:
Hope it helps
#CarryOnLearning
Where is glycogen stored? (choose all that apply)
muscles
bones
organs
skin
A container of oxygen gas is at STP. If this sample is put into an oven at 280 C, what would its pressure be, in atmospheres?
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial pressure (P1) = 1atm
Initial temperature (T1) = 0°C = 0°C + 273 = 273K
Final temperature (T2) = 280°C = 280°C + 273 = 553K
Final pressure (P2) =...?
Step 2:
Determination of the new pressure of the gas.
Since the volume of the gas is constant, the following equation:
P1/T1 = P2/T2
will be used to obtain the pressure. This is illustrated below:
P1/T1 = P2/T2
1/273 = P2 / 553
Cross multiply
273x P2 = 553
Divide both side by 273
P2 = 553/273
P2 = 2.03atm
Therefore, the new pressure of the gas will be 2.03atm
Answer:
[tex]\boxed {\boxed {\sf P_2=2.03 \ atm}}[/tex]
Explanation:
We are concerned with the variables of temperature and pressure, so we use Gay-Lussac's Law, which states the temperature of a gas is directly proportional to the pressure. The formula is:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
We know that the container of gas begins at standard temperature and pressure (STP). This is 1 atmosphere of pressure and 273 Kelvin.
[tex]\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{T_2}[/tex]
We know the gas is put into an oven at 280 degrees Celsius. We can convert this to Kelvin.
K= °C + 273.15 K= 280 +273.15K= 553.15[tex]\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{553.15 \ K}[/tex]
We are solving for the new pressure, so we must isolate the variable P₂. It is being divided by 553.15 Kelvin. The inverse of division is multiplication, so we multiply both sides by 553.15 K
[tex]553.15 \ K *\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{553.15 \ K} * 553.15 \ K[/tex]
[tex]553.15 \ K *\frac { 1 \ atm}{ 273 \ K}= P_2[/tex]
The units of Kelvin cancel.
[tex]553.15 *\frac { 1 \ atm}{ 273 }= P_2[/tex]
[tex]2.02619047619 \ atm = P_2[/tex]
Rounded to the nearest hundredth:
[tex]2.03 \ atm \approx P_2[/tex]
The new pressure is approximately 2.03 atmospheres.
A chemical lab has isolated a metallic element from a compound. The metal
is highly reactive by itself and reacts with chlorine in a 1 to 1 ratio. In which
group of the periodic table is this element most likely found?
O A. 18
B. 17
C. 1
D. 2
SUBMIT
Answer:
C. 1
Explanation:
Group 1 metals are highly reactive (such as Sodium) and form 1 to 1 ratio of ions with halogens (such as chlorine, bromine etc).
This happens because group 1 element can donate 1 valence electron to fulfill their octet rule and halogens can receive 1 valence electron to fulfill their octet.
Describe the surgery that would be used to treat Kayla's condition. What are the risks of the surgery?
Answer:
By pass surgery.
Explanation:
Kayla is suffering with blocked artery. The doctors have tried to open up her blocked artery with injecting the stunt by angioplasty process. The treatment had been unsuccessful and she is still complaining chest pain. The next move of the doctors would be by pass surgery which will open up the blocked artery. There are many risks involved in this surgery. The patient may get into coma due to excess bleeding or she may die if her blood pressure shoots up during surgery.
Does anyone have the chemistry paper 1 higher 2019 mark scheme thank you
no
Explanation:
i simply answered the question
you didnt ask for it you simply asked if i had it
being mad is no use, same with reporting and taking this down
in thoery my answer is correct
so, dont get mad, dot report, dont take this down
this is my protest