Answer:
Energy costs are high for many school districts. Therefore, unlimited free power generated by the sun can deliver huge cost savings when compared to grid-generated power. With a modestly sized solar array, cost savings are alike modest.
Explanation:
A solar flare may cause charged particles to enter the earth's atmosphere.
true false
Answer:
True
Explanation:
This is because the Earths ionisphere was distrubed which makes radio communications.
what is 750 grams of phosphorus
The moles of phosphorous which are present in 750 grams of phosphorous is 24.27 moles.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of phosphorous which are present in 750 grams will be calculated as:
n = 750g / 30.9g/mol = 24.27 moles
Hence the resultant moles of phosphorous is 24.27 moles.
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ANSWER THIS QUESTION PLEASE!
15. Identify What types of bonds are present in an alkyne?
Answer:
Alkyne are hydrocarbons which contain carbon-carbon triple bonds.
Consider the following statistic. As of January 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 years of operating 104 nuclear power plants. On average, how much waste is produced by each plant on a monthly basis? 0. 8 tons per month 83. 3 tons per month 104 tons per month 866. 3 tons per month.
Answer: A
Explanation:
requires temperatures of millions of degrees K
Many factors would bring advantages when using fuel cells in cars, but which factor presents a drawback? fuel consumption hydrogen storage greenhouse gas emissions reliance on petroleum products
One potential drawback of using fuels cells in cars is that it require large tanks for hydrogen storage.
What are fuels cells?Fuel cells are cells which use hydrogen and oxygen as fuel to produce electrical energy for use in various purposes such as in powering cars.
The energy produced is as a result of redox reactions.
Fuels cells are clean renewable energy sources.
A potential drawback of using fuels cells in cars is that it require large tanks for hydrogen storage.
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In a laboratory experiment, you perform the above reaction. However, you only get 7.50g of Al. What was the percent yield of that experiment?
Answer:
Explanation:
n a laboratory experiment, you perform the above reaction. However, you only get 7.50g of Al. What was the percent yield of that experiment?
Ethanol, an organic compound, has the following structural formula.
H
H
H-C-C-0-H
I
1
H H
What is the chemical formula for ethanol?
O CHO
O
C₂H5O
C₂H5O2
O C₂H6O
Answer:
hope this will help you
Explanation:
[tex]the \: structural \: formula \: is \: ch3 - ch2 - oh \\ \\ and \: chemical \: formula \: is \: c2h6o[/tex]
The chemical formula for ethanol is [tex]C_2H_5OH[/tex], where there are 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom are there.
What is the chemical formula?A chemical formula tells us the number of atoms of each element in a compound.
The methyl group ([tex]CH_3-[/tex]) carbon attaches to the methylene group ([tex]CH_2-[/tex]) carbon, which binds to the oxygen of the hydroxyl group (-OH).
Hence, the chemical formula for ethanol is [tex]C_2H_5OH[/tex], where there are 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom are there.
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2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O
In the above equation, how many grams of N2 can be made when 12.2 moles of CuO are consumed?
Answer:
114 grams N₂
Explanation:
To find the answer, you need to (1) convert from moles CuO to moles N₂ (via the mole-to-mole ratio from equation) and then (2) convert from moles to grams (via molar mass from the periodic table). The final answer should have 3 sig figs according to the given value (12.2).
2 NH₃ + 3 CuO --> 3 Cu + 1 N₂ + 3 H₂O
Molar Mass (N₂): 2(14.01 g/mol)
Molar Mass (N₂): 28.02 g/mol
12.2 moles CuO 1 mole N₂ 28.02 grams
----------------------- x ----------------------- x ----------------------- = 114 grams N₂
3 moles CuO 1 mole N₂
Which of the following is an oxidation half reaction
Answer:
Sn²⁺ → Sn⁴⁺ + 2e⁻
Explanation:
Answer:
The answer is..
Sn²⁺ → Sn⁴⁺ + 2e⁻
I hoped this helped, please let me know if it isn't the right answer btw. :)
Have a wonderful day!
what are advantage of using alternatives to fossil fuels?
Answer:
Fossil fuels release greenhouse gases and are non renewable
Why do medical implants and prosthetics should be carefully designed when placed inside or on the surface of the body?
Answer:
because it needs to fit exactly into how your body is like
Explanation:
3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.
Example Sentence
I am tired today and don't have much energy.
Energy:
____________
Example Sentence
Make sure to turn off the lights when you're done to save energy.
Answer:
Explanation:
3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.
what is the percent yield
the percent yield: 9/21 x 100% = 42.9%
find the iupac name for this question
Answer:
3 - Methylpent-2-yn-1-ol
Which change does thermal energy cause? *
O greater energy differences between molecules
O slower molecule movement
O reduced energy transfer
more collisions between molecules
Which has the most thermal energy?
1 points
200 ml of cold water
200 ml of hot water
100 ml of hot water
100 ml of cold water
If 321.5 grams of phosphorus chloride are made, how many grams of phosphorus were consumed?
If 321.5 grams of phosphorus chloride are made, then 168.235 grams of phosphorus were consumed.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of phosphorous chloride = 321.5g / 74.55g/mol = 4.315 mole
Given chemical reaction is:
2K + Cl₂ → 2KCl
From the stoichiometry of the reaction:
2 moles of KCl = produced by 2 moles of K
4.315 moles of KCl = produced by 4.315 moles of K
Mass of potassium = (4.315mol)(39g/mol) = 168.235 g
Hence required mass of phosphorous is 168.235 g.
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6.0 L of gas in a piston at a pressure of 1.0 atm are compressed until the volume is 3.5 L. What is the new pressure inside the piston?
From the calculations and by the use of Boyles law, the new pressure of the gas is 1.7 atm
What are gas laws?The term gas law is used to demonstrate the relationship between the volume, pressure, number of moles and temperature of a gas.
Using the Boyles law;
P1 = 1 atm
P2 = ?
V1 = 6 L
V2 = 3.5 L
P1V1= P2V2
P2= P1V1/V2
P2= 1 atm * 6 L/3.5 L
= 1.7 atm
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the fastest train on earth, the TGV in france, can travel 800 miles in 2.5. what is the speed?
Answer:
s= 3.20 mph
Explanation:
s=t/d
s=380miles/5hours
if it has a high temp but a low pressure does it dissolve faster than a high pressure and a low temperature
Answer:
it dissolve faster in higher temperature hope it's right
The speed limit on a certain highway is 72 km/h. what is the speed in cm/s?
Answer:
7.2e+6 cm (7200000cm)
Explanation:
Hope this is the answer your looking for ;)
7. Review Why do carbon atoms form four covalent bonds?
Answer:
four single covalent bonds
Explanation:
cuz a carbon atom initially has four unpaired electrons in its outermost shell....sharing adds four more....making four bonds
Does sodium fluoride follow the octet rule? If not, which exception is it?
Answer:
Sodium fluoride (NaF) does indeed follow the octet rule without any violations.
If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 28 days?
Round to the nearest whole number.
Answer:
2500g
Explanation:
Half-life like the name suggests cuts the amount by half. So 10,000 grams would be 5,000 grams in one half-life (14 days). But 28 days is two halflives (14 + 14 = 28), thus 5,000 would be cut in half again to finally be 2500 g.
when chlorine is added to acetylene tetrachloroethane is formed How many grams of tetrachloroethane are ade if 15 liters of chlorine is used with excess C2H2
35.5 g of tetrachloroethane is added if 15 grams of chlorine is used with excess [tex]C_2H_2[/tex].
What is a balanced chemical equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
Balanced chemical equation:
[tex]2Cl_2 (g) + C_2H_2 (g)[/tex] → [tex]C_2H_2Cl_4(l)[/tex]
In your case, 2 moles of chlorine gas are needed to produce 1 mole of tetrachloroethane, which implies that there's a 2:1 mole ratio between the two.
Calculating the mass of tetrachloroethane.
[tex]m[/tex][tex]C_2H_2Cl_4(l)[/tex] = [tex]15 g[/tex] [tex]Cl_2 (g)[/tex] X [tex]\frac{2 mol \;of \;Cl_2}{70 g \;Cl_2}[/tex] X [tex]\frac{1 mol \;of \;C_2H_2Cl_4(l)}{2 mol \;Cl_2}[/tex] X [tex]\frac{167.8 g \;C_2H_2Cl_4(l))}{1 mol \;C_2H_2Cl_4}[/tex]
[tex]C_2H_2Cl_4(l)[/tex] = [tex]17.75 g[/tex]
[tex]C_2H_2Cl_4(l)[/tex] = [tex]35.5 g[/tex]
Hence, 35.5 g of tetrachloroethane is added if 15 gram of chlorine is used with excess [tex]C_2H_2[/tex]
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27. Write balanced equations that describe the following reactions.
a. the dissociation of perchloric acid in water
b. the dissociation of propanoic acid (CH3CH2CO2H) in
water
c. the dissociation of ammonium ion in water
#a
HClO_4(aq)+H2O(l)—»H3O+(aq)+ClO_4#b
CH3CH2COOH + H2O ==> CH3COO^- +H3O#c
This is reversible reaction
H2O + NH_3 ⇄ OH^- + NH4^+Select the correct answer from the drop-down menu. of all the sunny club members in a particular city, 25% prefer swimming on weekends and 75% prefer swimming on weekdays. it is found that 10% of the members in that city prefer swimming on weekends and are female, while 55% of the members in that city prefer swimming on weekdays and are female. the probability that a club member picked randomly is female, given that the person prefers swimming on weekends, is .
Based on the percentage of people that prefer to swim on weekends, the probability that a female who prefers swimming on weekends is picked is 0.40.
What is the probability of a female weekend swimmer being randomly picked?This can be found by the formula:
= Percentage of females who prefer swimming on weekends / Percentage of those who swim on weekends
Solving gives:
= 10% / 25%
= 0.40 or 40%
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Two identical metal spheres at 8 °C are put in equal amount of water in two beakers, as shown below.
Two beakers are side by side; one is labeled Beaker A and the other is labeled Beaker B. Both beakers are the same shape, size, and are about two-thirds full with water. Both beakers have a metal sphere with a temperature of eight degrees Celsius submerged in the water.
Heat flows from the metal sphere to the water in Beaker A and from the water to the metal sphere in Beaker B. Which statement is correct? (4 points)
The temperature of the water is greater than 8 °C in Beaker A.
The temperature of the water is lower than 8 °C in Beaker B.
The temperature of the water in Beaker A will increase.
The temperature of the water in Beaker B will increase.
Answer:The temperature of the water in both beakers is greater than 8 °C. in beaker B
Explanation:
