Answer:
C) by converting hydrogen to helium.
Explanation:
The Sun keeps shining because of nuclear fusion processes, which consists in creating helium atoms by combining hydrogen atoms, of an atomic mass less that of helium, in conditions of high core pressure and temperature. In other words, the Sun keeps shining by producing helium at the expense of its hydrogen reserves.
Therefore, the correct answer is C.
Write a mechanism for the Williamson ether synthesis of 1-methoxy-4-propoxybenzene from 4-methoxyphenol and propyl bromide. Be as complete as possible and show electron flow for all steps.
Answer:
(Mechanism in attachment).
Explanation:
The Williamson ether synthesis is the most used method to form ethers, in which an alkoxide ion reacts with a primary alkyl halide in an SN₂ reaction. Usually, the alkoxide ion is prepared by the reaction of an alcohol with a strong base like sodium hydride, NaH.
The alkyl halide must be primary so an attack by the backside is not impeded. When the alkyl halide is not primary, the result is usually an elimination.
Mechanism
Step 1: form the alkoxide of the alcohol considering the most impeded group (in this case, the 4-methoxyphenol).
Step 2: the alkoxide displaces the leaving group from a good SN₂ substrate (the propyl bromide).
Therefore, in Williamson ether synthesis, the alkyl halide must be a good SN₂ substrate (generally primary). We choose the alkyl group less impeded to be the halide and the most impeded group to be the alkoxide ion.
Why does crash affect the motion of the objects?
Answer:
When something crashes it affects the motion of an object because what it crashed into had force going in the opposite direction.
Explanation:
what is biochemistry
Answer:
Biochemistry or biological chemistry, is the study of chemical processes within and relating to living organisms
Explanation:
Cl2 and N2 react according to the following equation 3Cl2(g) + N2(g) rightarrow 2NCl3(g) If 4 L of a stoichiometric mixture of chlorine and nitrogen are converted to nitrogen trichloride under conditions of constant temperature and pressure what is the volume of NCl3(g) produced?
Answer:
Volume of NCl3 is 3L
Explanation:
Avogadro states: All gases at the same volume under temperature and pressure constant have the same number of moles.
The chemical equation is:
3Cl2(g) + N2(g) → 2NCl3(g)
Where 3 moles of chlorine reacts with 1 mole of nitrogen to produce 2 moles of NCl3.
But using Avogadros law we can say:
3L of chlorine and 1L of nitrogen produce 2L of Nitrogen trichloride.
3L of chlorine and 1L of nitrogen: 4L (The stoichiometric mixture)
That means, volume of NCl3 produced is 3L
Ms. Cristell, a seventh-grade teacher at OHVA, made the following statement, "Sound energy, also known as acoustic energy, is a type of mechanical energy." Why are sound waves considered a type of mechanical energy? Sound waves can travel through space Sound waves can travel through a solid Sounds waves are made by machines Sound waves transfer energy by the motion of particles
Answer:
The answer is D
Explanation:
I recently took a test with the same question and it said the answer was correct
I hope this helps and have a nice day <3
Answer:
WOWOWWOWOOWOWOWOW
Explanation:
A sample of gas has an initial volume of 3.00 L and an initial pressure of 2.14 atm. If the volume expands to 8.15 L, what is the final pressure?a. 0.855 atm b. 0.788 atm c. 3.49 atm d. 5.81 atm
Answer:
The final pressure is 0.788 atm (option b).
Explanation:
Boyle's law says that the volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure. That is: if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases. This is expressed mathematically as the product of pressure times volume equal to a constant value:
P*V=k
Assuming a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:
P1*V1=P2*V2
In this case:
P1= 2.14 atmV1= 3 LP2= ?V2= 8.15 LReplacing:
2.14 atm*3 L= P2* 8.15 L
Solving:
[tex]\frac{2.14 atm*3 L}{8.15 L} =P2[/tex]
0.788 atm= P2
The final pressure is 0.788 atm (option b).
Help me with this question so I can move on from it.
Just look it up on google kodvjkngkrefsnjkvjfrnefsjkj
Physical Properties
Directions: Read each statement below. If the statement is true, write T. If the statement is false, write F. Then rewrite the statement, with corrections, on the lines provided.
Mass is the weight of an object. ___________________________________________________________________
______________________________________________________________________________________________________
Solubility and melting point are two examples of physical properties. _________________________
______________________________________________________________________________________________________
Atoms that make up a compound are bonded together; they cannot be separated by physical means. _____________________________________________________________________________
________________________________________________________________________________________________
The density of an object can be calculated by dividing the object’s length by its width.
_____________________________________________________________________________________________________________________________
___________________________________________________________________________________________________________________________
A physical property is a characteristic of matter that you cannot observe or measure without changing the identity of the matter.
________________________________________________________________________________________________________________________________________________________________________________________________________________
Every element and compound has a unique set of properties.
___________________________________________________
Statement 1: False
Mass is defined as the quantity of matter.Statement 2: True
Statement 3: True
Statement 4: False
Density = mass/volumeStatement 5: False
An example of a physical property is color, which can be determined by observation.Statement 6: True
What type of alloy will C and Fe form?
A. Substitutional alloy
B. Structural alloy
C. Composite
D. Interstitial alloy
Can someone do my chemistry work? I'll pay you, also comment your socials please so I can contact and show you the questions!
Answer:
Stan Loona
Explanation:
Answer:
i dont feel like sending out my socials but if you can send me a picture of the problems on here i would be happy to help for free
Explanation:
i dont know if im going to be right about the questions but i can try
Pls help with this
Answer:
ok so u take 90-20 for the is where the miniscus is at and u get 70 then count the number of spaces between 70 and 80 and then take that and subtract 70 and 20 to get 50 and i think thats ur answer.
I HOPE THIS IS HELPFUL!!!
The barcoding process begins with
Answer:
Explanation:
It starts with the company getting a GS1 Company Prefix Before a firm starts to use a barcode it has to come up with the GS1 Identification Keys which are the numbers that represent the company’s barcode. When the GS1 identification key is assigned, the firm acquires the GS1 Company Prefix that will enable the firm to create the identification keys for its goods, locations, trade items and coupons which will be unique to it worldwide.
what type of motion is illustrated in the diagram below?
Which of the following is not a part of the carbon cycle
Answer:
condensation is NOT part of the carbon cycle
Explanation:
please help if you get this right i will give brainliest will give 30 points
Answer:
change in size or shape
Explanation:
Answer: hey
Explanation:
At standard temperature and pressure the molar volumes of CO2 and NH3 gases are 22.31 and 22.40 L, respectively. The density of crystalline CO2 at 160 K is 1.56 g/cm^3. Calculate the molar volumes.
Answer:
Molar volume of CO₂ at 160 K = 0.02820 L per mole
molar volume of NH₃ at 160 K = 0.02024 L per mole
Note: The question is incomplete. The complete question is given below:
At standard temperature and pressure the molar volumes of CO2 and NH3 gases are 22.31 and 22.40L respectively. The densities of crystalline CO2 and NH3 at 160K are 1.56 and 0.84 g/cm^3, respectively. Calculate their molar volumes
Explanation:
molar mass of CO2 = 44.0 g/mol
molar mass of NH3 = 17.0 g/mol
Density = mass/volume
Therefore, Volume = mass/density
Volume of CO2 = mass of CO2/ density of CO2
Volume of CO2 = 44.0 g/mol / 1.56 g/cm³ = 28.20 cm³ per mole
Converting to liters 28.20 * 1 L/1000 cm³ = 0.02820 L per mole
Therefore, molar volume of CO2 at 160 K = 0.02820 L per mole
Volume of NH3 = mass of NH3/ density of NH3
Volume of NH3 = 17.0 g/mol / 0.84 g/cm³ = 20.24cm³ per mole
Converting to Liters; 20.24 cm³ * 1 L/1000 cm³ = 0.02024 L per mole
Therefore, molar volume of NH3 at 160 K = 0.02024 L per mole
A gas made up of homonuclear diatomic molecules escapes through a pinhole 1.37 times as fast as cl2 gas. Write the chemical formula of the gas.
Answer:
F₂
Explanation:
Let the R₁ represent the rate of diffusion of Cl₂
Let R₂ represent the rate of diffusion of the gas.
Let M₁ represent the molar mass of Cl₂
Let M₂ represent the molar mass of the gas.
From the question given above, the following data were obtained:
NOTE: Assume the rate of diffusion of Cl₂ is 1.
Rate of diffusion of Cl₂ (R₁) = 1
Rate of diffusion of the gas (R₂) = 1.37 times R1 = 1.37 × 1 = 1.37
Next, we shall determine the molar mass of the gas. This can be obtained as follow:
Rate of diffusion of Cl₂ (R₁) = 1
Molar mass of Cl₂ (M₁) = 35.5 × 2 = 71 g/mol
Rate of diffusion of the gas (R₂) = 1.37
Molar mass of the gas (M₂) =?
R₁/R₂ = √(M₂/M₁)
1/1.37 = √(M₂/71)
Square both side
(1/1.37)² = M₂ /71
1/1.8769 = M₂ /71
Cross multiply
1.8769 × M₂ = 71
Divide both side by 1.8769
M₂ = 71 / 1.8769
M₂ = 37.8 g/mol
Since the gas is a homonuclear (the same element) diatomic molecule, we shall divide the molar mass of the gas molecule by 2 to obtain the molar mass of the element that makes up the molecule. This is illustrated below:
Molar mass of the element = 37.8 / 2
Molar mass of the element = 18.9 g/mol
Comparing the molar mass of the element with those in the periodic table, the element that makes up the gas is fluorine. Thus the molecular formula of the gas F₂.
Which of the following elements is the most reactive?
a
Beryllium
b
Calcium
c
Magnesium
d
Barium
Explanation:
The answer would be Berium because it can mix as well with other elements in the periodic table.
Barium is regarded as the most reactive elements out of all the options
provided.
Barium is an element with symbol Ba and atomic number 56. It belongs to
Group 2 metals whose reactivity increases as we go down the group.
The alkaline earth metals which are in Group 2 of the Periodic Table include
: beryllium, magnesium, calcium, strontium, barium, and radium
The increase in reactivity down the group is as a result of the decreasing
ionization energy required to form new compounds. The Ionization energy
decreases due to more inner shells and increase in distance from the
nucleus.
Read more on https://brainly.com/question/6034926
How many tons of asphalt concrete will be required to overlay a 2.5 mile long 24 ft wide road with 3in of wearing course asphalt concrete that has a density of f 147.9PCF?
Answer:To determine the weight of the asphalt needed, first determine the area of the surface to be paved.
Since the shape of the road is a rectangle, use the formula of area of rectangle.
A = Length xx Width
Before plugging-in the values, convert the 2.5 miles to feet in order that the dimension to have same unit.
So,
2.5 mi xx (5280 ft)/(1mi) = 13200ft
Now that the length is in feet, plug-in the values of dimension of the road to the formula of area of rectangle.
A=13200*24
A=316800
Hence, the area to be paved is 316 800 ft^2 .
Next, determine the volume. Use the formula:
V = Area xx thickness
Before substituting the values, convert the thickness to feet in order to have same units.
So,
3 i n xx (1ft)/(12 i n)=0.25ft
Then, substitute the values of the area and thickness to the formula of volume.
V=316800*0.25=79200
Thus, the volume of the asphalt needed is 79200 ft^3.
Next, to determine its weight , multiply that with the given density 1479 pounds per cubic feet (1479 lb/ft^3).
W=79200*1479=117136800
So, the weight is 11 7136 800 lbs.
Then, convert it to tons.
117136800 lbs xx (1t o n)/(2000lbs) = 58568.4 t o n s
Explanation:i did the math
An atom has an atomic number of 19 and a mass number of 29. How many neutrons are in the atom?
Answer:
10
Explanation:
You take the atomic number and subtract it from the atomic mass. So in this case it would be 29-19 thus giving us 10.
What are some different things that can cause weathering?
Answer:
not recycling can make a hole in the ozone layer
Explanation:
Frost Weathering. Frost weathering occurs in the presence of water, particularly in areas where the temperature is near...Thermal Stress. Thermal stress occurs when heat absorbed from the surrounding air causes a rock to expand.Recycling keeps the ozone layer safe but if we stop recycling then we could burn a hole in the ozone layer and it could get even more hotter outside we might start sweating more often
Hope this helps ♡
2) Alum has twelve hydrated water molecules. Are these included in the molecular weight?
Why?
Answer:
The dot between KAl(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of KAl(SO4)2. Therefore, the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
Explanation:
The mass of the twelve water molecules are included in the molecular weight of the compound ,therefore the given statement is true.
What do you mean by molecular weight?Molecular weight is the sum of all atoms in a molecule. Molecular weight is represented in the atomic mass unit . It tells us the number of grams of a substance is present in one mole of that compound.
Molecular weight is based on the molecular formula of a compound.
According to the question, the dot between K Al(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of K Al(SO4)2.
And because of this the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
The twelve hydrated water molecules of alum are included in the molecular weight, hence the given statement is true.
Learn more about ,molecular weight ,here:
https://brainly.com/question/18948587
#SPJ2
What is oxidized in a galvanic cell? O A. The salt bridge O B. The electrolytes O C. The cathode D. The anode
Answer:
D. The anode
Explanation:
The anode is oxidized in a galvanic cell. Therefore, option D is correct.
What is a galvanic cell?A galvanic or voltaic cell is an electrochemical device that transforms the chemical energy of spontaneous redox reactions into electrical energy. electrical cell A voltaic cell is an electrochemical device that produces electricity through chemical processes.
An electrochemical cell called a galvanic cell or voltaic cell, respectively named after the scientists Luigi Galvani and Alessandro Volta produces an electric current by spontaneous oxidation-reduction reactions.
Since electrons are left on the electrode when oxidation occurs, the anode, the electrode where oxidation happens, is the negative electrode in a galvanic cell.
Thus, option D is correct.
To learn more about galvanic cells, follow the link:
https://brainly.com/question/13031093
#SPJ2
Idenify each statement below as either oxidation or reduction.
1.
Occurs when atoms gain electrons during bonding.:
2.
Occurs when the oxidation number of an element decreases in chemical reaction.:
3.
Occurs when atoms lose electrons during bonding.
4.
F + e- ----> F-
5.
Occurs when the oxidation number of an element increases in chemical reaction.:
Occurs when the oxidation number of an element increases in chemical reaction.
6.
2I- ----> I2 + 2e-
Answer:
Explanation:
An oxidation reaction has the following properties;
addition of oxygen removal of hydrogenloss of electronsincrease in oxidation numberincrease in the number of electronegative atom surrounding an element in changing from reactants to products.The reduction reaction is the opposite of the points mentioned above;
1. Occurs when atoms gain electrons during bonding: Reduction
2. Occurs when the oxidation number of an element decreases in chemical reaction: Reduction
3. Occurs when atoms lose electrons during bonding: Oxidation
4. F + e- ----> F- : Reduction
5. Occurs when the oxidation number of an element increases in chemical reaction: Oxidation
6. 2I- ----> I2 + 2e- : Oxidation
Carbon dioxide, water and carbon monoxide are all types of what?
Answer:
compounds, atomic compounds
Answer:
CO - carbon monoxide and CO2 - carbon dioxide are often confused. The names sound the same, they both are colorless and odorless gases, and at high concentrations, both can be deadly. The difference is that CO2 is a common, naturally occurring gas required for all plant and animal life. CO is not common.
Explanation:
Which of the following best describes the “social sciences”? Sciences that focus on researchers conducting objective studies Sciences that are able to objectively measure human behavior Sciences that focus on human behavior and society Sciences that objectively measure natural phenomena
Answer:
human behovoir
Explanation:
how many grams does 6.02 x 1023 atoms of he weight
Answer:
=16.00 g/mole
Explanation:Oxygen’s atomic weight is 16.00 amu.
1 mole of oxygen is 6.02 x 1023 atoms of oxygen
1 amu = 1.661 x 10-24g
What is the molar mass (g/mole) of oxygen?
16.00 amu/oxygen atom x 1.661 x 10-24g/amu
= 2.657 x 10-24 g/atom x 6.02 x 1023 atoms/mole
=16.00 g/mole
Molar mass (in grams) is always equal to the atomic weight
What is the most effective method for monitoring the effects of global warming?
Monitor the amount of carbon dioxide in the atmosphere.
Monitor the number of miles traveled by people in cars each year.
Monitor the amount of greenhouse gases put out by factories.
Monitor the sea level over set period of time.
Answer: D) Monitor the sea level over set period of time.
Since global warming causes land ice to melt, that water goes into the ocean to raise sea levels. This is an effect of global warming.
Choices A through C are things to measure if you want to measure causes of global warming, so we can rule those out.
which phase describes the mass of an ice cube
Answer:
Total amount of water in the ice cube
Explanation:
The mass of an ice cube is the total amount of water in the ice cube. Ice is the solid form of water. Hope this answers the question. Have a nice day. Feel free to ask more questions.
Which statement explains why a rock does not sink in a lake that is frozen over?
1. Particles are much harder in a solid than in a liquid.
2. Particles are much closer together in a solid than in a liquid.
3. Particles in a solid are moving too fast for anything to penetrate them.
4. Particles in a solid are fixed in place.
(will get brainliest)
