Answer:
definition- the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.
Power your home with renewable energy, Invest in energy-efficient appliances, and Reduce water waste etc.
Answer:
Global warming is an effect on Earth, caused when too much carbon dioxide is present in the air. Carbon dioxide is a green house gas and partially restricts radiation from going back to into space, preventing the Earth from becoming too cold.
However, too much carbon dioxide has the effect of warming the Earth more than normal as it traps more heat on Earth. Thus, the greenhouse effect is enhanced- in short, global warming means that the Earth is much more warmer than normal.
The temperature on Earth has increased by 0.5 °C in the last 100 years. Although this doesn't seem like much, but a small increase can cause a big change. Global warming causes ice sheets to melt and causes sea levels to rise. Due to this, costal flooding frequently happens. In drier seasons, the heat is also more intense becuase of global warming.
Global warming can be reduced by burning less fossil fuels and using solar and wind power instead. Using more public transport could also help reduce carbon dioxide present in the atmosphere, as less vehicles will be releasing carbon dioxide. Reducing the amount of deforestation will greatly help reduce global warming, because trees absorb carbon dioxide from the atmosphere, and through the process of carbon dioxide, they change it into oxygen.
0.850 moles of N2 originally at 85°C is cooled such that it now occupies 17.55L at 1.25 atm. What is the final temperature of the gas?
The final temperature of the gas is 269.9 K, or -3.25 °C, which was calculated with the help of ideal gas equation.
What is the ideal gas equation?The ideal gas equation gives the relation between pressure, volume and temperature.
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
To find the initial volume of the gas. We can use the fact that the number of moles of gas does not change during the cooling process:
n = 0.850 moles
We can also use the ideal gas law to find the initial volume of the gas:
PV = nRT
V = nRT/P
where R = 0.08206 L atm/K mol is the gas constant.
Convert the initial temperature from Celsius to Kelvin:
T1 = 85 °C + 273.15 = 358.15 K
Substitute the given values into the equation:
V₁ = (0.850 mol)(0.08206 L atm/K mol)(358.15 K)/(1 atm) = 24.03 L
Now we can use the combined gas law to find the final temperature:
(P₁V₁/T₁) = (P₂V₂/T₂)
Substitute the given values into the equation:
(1.25 atm)(24.03 L)/(358.15 K) = (P₂) (17.55 L)/(T2)
Solve for T₂:
T₂ = (P₂)(17.55 L)(358.15 K)/(1.25 atm)(24.03 L)
T₂ = 269.9 K
Therefore, the final temperature of the gas is 269.9 K, or -3.25 °C.
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Question 6 (4 points)
(08.02 MC)
What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? (4 points)
а
26.596
D
20.946
с
18.296
d
16.796
Answer:
20.9%
Explanation:
I took the test i hope this helps:)
The percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%. This is calculated using the definition (formula) of percentage by mass of a solution.
What is meant by percentage by mass?The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
The formula for percentage by mass is given as
percentage by mass = (mass of the solute/ total mass of the compound solution) × 100
Calculating percentage by mass for the given solution:The mass of the solute ( the chemical which is going to be dissolved) HCl
= 27.0 grams
The mass of the solvent (the substance in which a solute dissolve) water
= 102.0 grams
So, the total mass of the solution = 27.0 + 102.0 = 129.0 grams
Then, the percentage by mass = [tex]\frac{27.0}{129.0}[/tex] × 100 = 20.93%
Which is approximate equal to 20.946 at option B.
Therefore, the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%.
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In calorimetry, energy is measured through heat transfer from one substance to
another. Which of the following is NOT a method of heat transfer?
Answer:
Refraction
Explanation:
The solubility of N2in blood at 37°C and at a partial pressure of 0.80 atm is 5.6 × 10−4mol/L. A deep-sea diver breathes compressed air with the partial pressure of N2equal to 4.0 atm. Assume that the total volume of blood in the body is 5.0 L. Calculate the amount of N2gas released (in liters at 37°C and 1 atm) when the diver returns to the surface of the water, where the partial pressure ofN2is 0.80 atm.
Solution :
According to Henry's law of solubility, we have c = kp
Henry's law constant, [tex]$k=\frac{c}{p}$[/tex]
[tex]$=\frac{0.00056}{0.80}$[/tex]
= 0.0007 mol/L.atm
When the pressure is = 4 atm
The solubility is c = 0.0007 mol/(L.atm) x 4 atm
= 0.0028 mol/L
Therefore, in a 5 liter of blood, the moles of nitrogen dissolved
= 0.0028 x 5
= 0.014 moles
At the surface, the solubility is = 0.00056 mol/L
So the moles of the nitrogen dissolved = 5 x 0.00056
= 0.0028 moles
Therefore, the number of moles of nitrogen released = 0.014 - 0.0028
= 0.0112 moles
Given total pressure = 1 atm
Temperature = 37 degree C
= 37 + 273
= 310 K
R = [tex]$0.0821\ L -atm/ mol.K $[/tex]
Therefore, volume of the nitrogen is
[tex]$V=\frac{nRT}{P}$[/tex]
[tex]$V=\frac{0.0112 \times 0.0821 \times 310}{1}$[/tex]
= 0.285 L
When might a doctor prescribe
steroids?
Use the drop-down menus to answer the questions about fronts and weather maps.
Cold fronts appear on weather maps in areas of .
Warm fronts appear on weather maps in areas of .
Answer:
Large temperature and air pressure decrease.
Temperature and air pressure increase.
Explanation:
The correct options about fonts and weather maps are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
What is a cold front and warm front?Similar to a cold front, there is usually a noticeable temperature change from one side of the warm front to the other.
A cold front occurs when colder air replaces warmer air, while a warm front occurs when warmer air replaces cold air.
Thus, the correct options are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
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Determine the pH of 1.0 x 10-10M NaOH
pH=
Answer:
4
Explanation:
Applying,
pH = 14-pOH.................... Equation 1
But,
pOH = -log(OH⁻)
Where OH⁻ = Hydroxyl ion concentration of NaOH.
From the question,
Given: OH⁻ = (1×10⁻¹⁰) M
Substitute these values into equation 1
pH = 14-log((1×10⁻¹⁰)
pH = 14-10
pH = 4
Hence the pH of NaOH with a molarity of 1.0 x 10-10M = 4
A. If the mass of Hydrogen is 1 amu, what is the mass of Hydrogen in the reactant side of the equation above?
B. what is the mass of Hydrogen on the product side of the equation above?
Answer:
there are 4 hydrogen so
A.the mass of Hydrogen in the reactant side of the equation above is 1×4=4 amu.
B.the mass of Hydrogen on the product side of the equation above =1×4=4 amu.
Note: mass of reactant =mass of product.
explain why hydrogen chloride does not conduct electricity, but a solution of hydrogen chloride and water conduct electricity
How do people determine if a vehicle in which they are sitting is moving?
Group of answer choices
A.by comparing their position to a fixed object inside the vehicle
B.by comparing their position to a fixed object outside the vehicle
C.by comparing their position to a moving object inside the vehicle
D.by comparing their position to a moving object outside the vehicle
Answer:
B.
Explanation:
The only way to make this comparison is by comparing their position to a fixed object outside the vehicle. Comparing to a fixed object inside the vehicle will show no movement, while a moving object inside the vehicle will seem as though the car is still while the object is in motion. Comparing to a moving object outside the vehicle will conflict with the vehicle, if the object is moving at the same speed and direction as the vehicle, it will seem as though neither is moving. The only way to make this comparison correctly is by comparing to an object outside the vehicle that is not moving so that the only variable that can be moving is the vehicle itself.
When 12.00 moles of potassium chlorate decomposes, how many dm3 of oxygen are produced at 325K and 188 kPa?
2KClO3 →2KCl + 3O2
show work pls
Answer:
258.71 dm³
Explanation:
We'll begin by calculating the number of mole of O₂ produced by the decomposition of 12 moles of KClO₃. This can be obtained as follow:
The balanced equation for the reaction is given below:
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Therefore, 12 moles of KClO₃ will decompose to produce = (12 × 3)/2 = 18 moles of O₂.
Finally, we shall determine the volume of the O₂. This can be obtained as follow:
Temperature (T) = 325 K
Pressure (P) = 188 KPa
Number of mole (n) = 18 moles
Gas constant (R) = 8.314 KPa.dm³/Kmol
Volume (V) =?
PV = nRT
188 × V = 18 × 8.314 × 325
188 × V = 48636.9
Divide both side by 188
V = 48636.9 / 188
V = 258.71 dm³
Thus, 258.71 dm³ of oxygen were obtained from the reaction.
Calculate the volume of solvent present in a 55.5%
by volume of 10.5 mL alcohol solution.
Answer:
I dont know
Explanation:
good luck
Convert 7.8 moles of carbon tetrafluoride into grams.
Answer:
686.43363984 is the answer when 7.8 moles is converted.
When two substances at room temperature are combined, the product feels HOT. What
kind of reaction is this?
Answer:
The correct answer is - exothermic reaction.
Explanation:
Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.
In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.
What quality is attributed to water due to “capillary action”?
A. change of liquid water into gaseous phase
B. the ability of water molecules to adhere to the surfaces of objects
C. high volatility
D. vapor pressure
Answer:
I think it's B. The ability of water molecules to adhere to the surfaces of objects
given mass of nitrogen is 0.12 dm^3 at 60°C and 1.01*10^5 Nm^2. Find its pressure at the same temperature if its volume is changed to 0.24 dm^3
50500Nm^2 or 5.05Nm^2
Explanation:
so bring out the parameters
p1= 0.12dm3, T1= 60c , because temperature is in kelvin add 273= 333k, v1= 0.12dm3 , T2= to the same value because the temperature didn't change = 333k, v2= 0.24dm3,P2= ?
general gas equation p1v1 over T1 = P2V2 over T2, when you input everything or make p2 the subject of the formula first you'll get the answer, pressure can have an s.i unit of mmhg but I'm using the same si unit as the question given and always check your units in the question to convert. please if this question has options please check, I don't want you to fail so verify from others if I made a mistake
Robert Hooke observed a slice of cork under a microscope. He saw what looked like “pores” or “cells” in it. Hooke can assume that the cork is most likely - Answer F A man made material G A type of living organism H A type of mineral J A petroleum based product
The cork oak tree from which cork is extracted is native to southwest europe and northwest africa. Cork is extracted from cork oak trees without harming the tree. So cork is a type of mineral. The correct option is C.
What is a cork cell?The dead cells without having intercellular spaces are defined as the cork cells. They appear at the periphery of roots and stems when they grow older and increase in girth. They also have a chemical called suberin in their walls.
It is the suberin which makes them impervious to gases and water. The outer protective coat of a tree is called the cork. It is one of the components of bark of the tree. The tissues of bark become old and the secondary mersitem replaces them.
Cork is made up of multiple thick layers and it protects the tree from bacterial or fungal infection.
Thus the correct option is C.
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A 3.8 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.8 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After the reaction, the contents of the reaction vessel weigh 11.6 g. What is the mass of carbon dioxide released during the reaction
Answer:
3.0 g
Explanation:
The total mass at the beginning of the reaction is:
3.8 g + 10.8 g = 14.6 gFollowing the law of conservation of mass, this same mass has to be present once the reaction is complete. This means that the mass diference between the contents of the reaction vessel after the reaction and the mass at the beginning of the reaction is the mass of released carbon dioxide:
14.6 g - 11.6 g = 3.0 gis benzene saturated or unsaturated?
Answer:
Benzene shows that it is actually unsaturated because it adds hydrogen or chlorine, although only when allowed to react under very vigorous conditions (higher temperature or pressure) compared to those required for alkenes and alkynes.
Explanation:
The equivalence point of a titration corresponds to which of the following?
O the point where equal volumes of acid and base have been used
O Equivalence point is another term for end point
All of the listed options are true
Equivalence point is defined as the point where the pH indicator changes color
O the point where the acid and base have been added in proper stoichiometric amounts
Answer:
E: the point where the acid and base have been added in proper stoichiometric amounts
Explanation:
Equivalence point in titration is simply the point where the amounts of acid and base used just sufficiently reacts chemically to cause neutralization whereas the endpoint is the point where the indicator of the titration changes colour.
The Equivalence point occurs before the endpoint.
Thus, option E is correct.
manganese (V) carbonate + nickel (II) phosphite -->
Answer:
[tex]3Mn_2(CO_3)_5+5Ni_3(PO_3)_2\rightarrow 15NiCO_3+2Mn_3(PO_3)_5[/tex]
Explanation:
Hello there!
In this case, for the given reactants side in this chemical reaction, it is possible for us to firstly write the left side of the undergoing chemical equation as shown below:
[tex]Mn_2(CO_3)_5+Ni_3(PO_3)_2\rightarrow NiCO_3+Mn_3(PO_3)_5[/tex]
Which means that the products are nickel (II) carbonate and manganese (V) phosphite. Next, we balance the reaction as shown below:
[tex]3Mn_2(CO_3)_5+5Ni_3(PO_3)_2\rightarrow 15NiCO_3+2Mn_3(PO_3)_5[/tex]
Which makes 15 carbonate ions, 10 phosphite ions, 15 nicked (II) ions and 6 manganese (V) on both sides of the chemical equation.
Best regards!
Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
the doge has the answer
Pb(NO3)4
Explain the term orbital.
Answer: a mathematical expression describing the probability of finding an electron at various locations; usually represented by the region of space around the nucleus where there is a high probability of finding an electron
Explanation:
if 6.2 mold of H2SO4 is dissolved to make 750 ml of sulfuric acid what is the molarity
Answer: The molarity of given solution is 8.26 M.
Explanation:
Given: No. of moles = 6.2 mol
Volume = 750 mL (1 mL = 0.001 L) = 0.75 L
Molarity is the number of moles of a substance present in a liter of solution.
Therefore, molarity of given solution is converted as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{6.2 mol}{0.75 L}\\= 8.26 M[/tex]
Thus, we can conclude that the molarity of given solution is 8.26 M.
The volume of 3.73 moles of a gas is 78.3 L at a certain temperature and pressure. At the same temperature and pressure, the moles of gas
that occupies 33.3 L is
Explanation:
) If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? P PV = nRT. 5.6 (12)=460821) T.
What are the missing coefficients for C3H8 + o2 = Co2 +H2O
Answer: C3H8 + 5O2 = 3Co2 +4H2O
Explanation: Equations must be balanced
You must have the same amount of C
H and O on both sides of the equation
Question 1
What term is used to describe atoms of the same element that have different masses?
O A) radioactive
B) constituents
C) telomers
OD) isotopes
E) None of the above
Answer:
Isotopes
Explanation:
iso means the same like in triangles (isosceles) so the atoms are the same element but different in mass. Since the isotopes have the same number of protons and electrons the isotopes have much the same chemical behavior. Since the isotopes have different numbers of neutrons the nuclear behavior differs.
Which of the following would be considered an Exothermic Reaction?*
Ice Melting
Burning wood
Boiling water
Baking a cake
Answer:
Burning wood
Explanation:
the fire releases heat into the air from the burning wood
How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
A balloon has a volume of 7.00 liters at a pressure of 740 mm Hg. If the temperature remains constant, at what pressure will the volume decrease to 2.00 liters?
a. 749 mm Hg
b. 52.9 mm Hg
c. 211 mm Hg
d. 2590 mm Hg
Answer:
D
Explanation:
P1 x V1 = P2 x V2
7.00(740) = x(2.00)
2590 mm Hg
took me a while because i dont know this, hope its right good luck