Answer:
Nepal aims to achieve universal access to clean, reliable and affordable renewable energy solutions by 2030. It is expected to reduce dependence on traditional and imported energy by increasing access to renewable energy. The use of solar energy is more reliable than traditional electricity in Nepal.
According to law of conservation of energy,solar energy is a renewable source of energy as it's heat can be converted to other forms of energy and can be conserved and is being looked as an alternative in Nepal.
What is law of conservation of energy?According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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Moseley discovered that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing
Moseley discovered that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing
" Atomic number "
El carbono de calcio se descompone por la acción del calor en óxido de calcio y dióxido de carbono. a). Escribe la ecuación química ajustada. b). Calcula qué cantidad de dióxido de carbona se forma si reaccionan 150g de carbonato de calcio.
Respuesta:
1.50 moles
Explicación:
Paso 1: Escribir la ecuación química ajustada para la descomposición del carbonato de calcio
CaCO₃ ⇒ CaO + CO₂
Paso 2: Calcular los moles correspondientes a 150 g de CaCO₃
La masa molar de CaCO₃ es 100.09 g/mol.
150 g × 1 mol/100.09 g = 1.50 mol
Paso 3: Calcular los moles de CO₂ producidos a partir de 1.50 moles de CaCO₃
La relación molar de CaCO₃ a CO₂ es 1:1.
1.50 mol CaCO₃ × 1 mol CO₂/1 mol CaCO₃ = 1.50 mol CO₂
are the bonds of OCl2 polar?
Answer: OCl2 is polar because the two O-Cl bond dipoles don't cancel each other.
It takes a season to create a hybrid, and about 15 years to create a_____.
•It takes a season to create a hybrid, and about 15 years to create a Plant variety.
may this helps you
hope it's correct
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The pH of a solution with a Hydronium (H30+) ion concentration of 0.001M is
Answer:
The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.
Explanation:
pH, short for Hydrogen Potential, is a measure used to establish the level of acidity or alkalinity of a solution.
pH indicates the amount of hydrogen ions present in a solution or substance. Mathematically the pH is the negative logarithm of the molar concentration of hydrogen ions or protons (H⁺) or hydronium ions (H₃O⁺).
pH= - log [H⁺]= - log [H₃O⁺]
The pH scale goes from 0 to 14. Values less than 7 indicate the range of acidity and those greater than 7 indicate alkalinity or basicity. The value 7 is considered neutral.
In this case, [H₃O⁺]= 0.001 M.
Replacing in the definition of pH:
pH= - log (0.001 M)
Solving:
pH= 3
The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.
HELP WILL GIVE BRAINLIEST NO WEIRD ANSWERS PLSS
Answer:
Solid
Explanation:
The reason is because the liquid aspirin has a plastic cover with a liquid inside and it doesn't take long for out stomach acid to dissolve the cover unlike the Solid aspirin where is slowly dissolves.
Students in a science class prepared flash cards so that they could quiz one another about the
arrangement of the periodic table. One of the flash cards contained information about two
elements, Element L and Element M.
Qualities:
-Atom of element M has two more balances electrons than element atoms of L
- atoms of element L are more reactive than atoms of element M
-both elements are metals
The students had to use the information on n the flash cards to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in the locations that match the information on the flash cards?
Answer:
the periodic table is G.
The periodic table has the elements placed in the locations that match the information on the flash cards is F.
What is periodic table?The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.
The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.
In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.
Thus, the periodic table has the elements placed in the locations that match the information on the flash cards is F.
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How many kilojoules of heat must be transferred to a 480-g aluminum pizza pan to raise its temperature from 22°C to 234°C? The specific heat of aluminum in this temperature range is 0.96 J/g.°С. Show your work.
Answer:
97.7 kJ
Explanation:
We'll use the formula for specifc heat: Q=mcΔT
Q= heat/energy (Joules), m= mass (grams), c= specific heat (different for each substance and is usually given)
ΔT= final temperature - initial temperature
Let's check our given units and see if they're the correct, here they all are. Let's plug in what we know.
Q=mcΔT
Q=(480)(0.96)(234 - 22)
Q=(480)(0.96)(212)
Q= 97,690 J
Before we submit an answer, let's check out units. We have our answer in Joules, but we want it it kilojoules, so we'll convert it knowing that:
1000 Joules = 1 kilojoule
97,690J x [tex]\frac{1 kJ}{1000J}[/tex] = 97.7kJ
Explanation:
the answer and the working out is shown above.
The extraction of zinc from zinc blend and explain how the zinc oxide be reduced using Carbon monoxide Electrolysis
Answer:
Zinc blend is Zinc sulphide, ZnS.
ZnS is roasted in air producing ZnO and Sulphur dioxide.
ZnO is reduced to Zn by CO.
Further purification is done by electrolysis.
In P plants the gene for the color of the sea has two alleys in the punnets square show me love the dominant alley Y represents yellow and recessive alley Y represents green based on the punnets square what percentage of offspring would be expected to have a green seeds
Answer:
25%.
Explanation:
In the F1 generation, the yellow colour is dominant so 75% of the seeds are yellow colour while on the other hand, 25% seeds are green in colour due to recessive allele. In the F1 generation, the ratio of dominant to recessive allele is 3:1. So on the basis of this 3:1 ratio we can say that there is 75% of yellow colour seeds and 25% of green colour seeds in the population of F1 generation.
thermal conductors what
Convert 15.75 grams of Magnesium to atoms.
Answer: [tex]3.903\times 10^{23}[/tex]
Explanation:
Given
Mass of magnesium is [tex]m=15.75\ gm[/tex]
The molar mass of magnesium [tex]M=24.3\ g/mol[/tex]
No of moles in 15.75 g of magnesium is
[tex]\Rightarrow n=\dfrac{15.75}{24.3}\\\\\Rightarrow n=0.648\ \text{moles}[/tex]
1 mole contains [tex]6.022\times 10^{23}[/tex] atoms
So, 0.648 moles contain [tex]0.648\times 6.022\times 10^{23}[/tex]
[tex]=3.903\times 10^{23}\ \text{atoms}[/tex]
Which fraction contains the largest molecules?
A) diesel
B)gasoline
C)kerosene?
1.
Events in which molten rock spews out of
the mantle as ash, lava, and gases
Answer:
Landslides, Volcanoes, Earthquakes, and Floods. A opening in the Earth's surface through which melted rock, gases, and ash escape. Events in which molten rock spews out from the mantle to the surface of Earth as ash, lava, and gases
Explanation:
Somebody look at all the science questions i posted plzzz help ( i will give brainliest
Answer:
ok
Explanation:
One of the main components of an airbag is the gas that fills it. As part of the design process, you need to determine the exact amount of nitrogen that should be produced. Calculate the number of moles of nitrogen required to fill the airbag. Show your work. Assume that the nitrogen produced by the chemical reaction is at a temperature of 495°C and that nitrogen gas behaves like an ideal gas. Use this fact sheet to review the ideal gas law.
The number of moles of the gas is 0.016 moles
What is the airbag reaction?We know that in the airbag, nitrogen gas is obtained by the decomposition of sodium azide as follows; 2NaN3 -----> 2Na + 3N2
Since it is under ideal conditions;
P = 1 atm
V = 1 L
T = 495°C or 768 K
n = ?
R = 0.082 atm LK-1mol-1
From;
PV= nRT
n = PV/RT
n = 1 atm * 1 L/ 0.082 atm LK-1mol-1 * 768 K
n = 0.016 moles
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An aqueous solution has a hydroxide-ion concentration of 1.0x10^-3M. What is the pH of the solution?
a.11
b.3
c.-3
d.7
What the common uses for Rutherfordium???
Answer:
welcome
Explanation:
Uses of Rutherfordium
Because rutherfordium is made within the lab, there are not very many uses for this element commercially. On the other hand, rutherfordium has been used within the laboratory setting to conduct research. Most elements that are highly radioactive are used for nuclear power and medicinal purposes.
A solution is prepared by dissolving 150. grams of NaCl in 500 milliliters of water. What is the
molarity of the solution?
Answer:
Explanation:
The answer should be .00500M
The molarity of the solution is = 5.12M
Molarity of the solutionThe molarity of a solution is the measures the number of moles of a solute per liter of a solution.
Molarity = moles solute/Liter solution
Molar mass of sodium (Na) = 23g
Molar mass of chlorine (Cl) = 35.5g
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
To calculate the quantity of moles in 150g of NaCl,
1mol = 58.5g
xmol = 150g
Cross multiply,
xmol= 150×1/58.5
= 2.56mol
To convert 500mL to Liters,
500/1000 = 0.5 Liters
Substituting into the equation, Molarity = moles solute/Liter solution
Molarity= 2.56/ 0.5 = 5.12M
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what happens to the wavelength as frequency increases
Explanation:
The higher the wavelength, the lower its frequency and energy
Answer:
As frequency increases wavelength decreases in size
Explanation:
The wavelength of the wave is inversely proportional to the frequency of the wave as the speed of the wave remains constant.
v = fλ ( v - speed, f - frequency, -wavelength)
[tex]\frac{v}{\lambda}[/tex] = f
Therefore at constant speed:
f ∝ [tex]\frac{1}{\lambda}[/tex] (inversely proportional)
Ice converts into water by absorbing heat. Explain
Here heat is absorbed to break the crystalline nature of ice and to make well separation between water molecules.
Explanation:
Latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature. ... Ice cubes melting as their temperature rises. During melting, the ice absorbs latent heat, which is used to change the state of the water from ice to liquid water.
____ occurs when the vapor pressure of a liquid is equal to the external atmospheric pressure.
Answer:
c
Explanation:
boiling
Researchers are studying a fish population in a small pond that has algae as the only producer in the ecosystem. The scientists are concerned about what might happen to the fish, if the algae suddenly disappear. Why is this a concern? What might be done to prevent this from occurring?
Explanation:
Algae is a group of a photosynthetic eukaryotic organisms that plays a very important role on the ecosystem. It forms the lower base of the food chain and supports all the life forms of the ecosystem. It takes up water and carbon dioxide from the atmosphere to prepare food during the process of photosynthesis and maintains a balance in the ecosystem.
In the context, if the algae disappears, the fish might die as the small fishes feeds on this algae. This is a concern as the algae is main component of food source and forms the base of the food chain. If there will be no algae there will be no life form on earth, as all species depend on each other to survive.
In order to prevent this from occurring, we must protect our algae. We must plant more trees, keep our water bodies healthy, we should not litter our ponds and lakes. We should also help these algae to grow and survive so that other life forms can feed them and thus maintain the ecosystem.
Put these events in order.
= Your phone contacts a base station in a cell.
= Once connected, a duplex system allows you to talk to the other person at the same time.
= You dial a number on your cell phone.
The MTSO then connects you to the other device.
= A base station contacts the Mobile Telephone Switching Office (MTSO).
Answer:
You dial a number on your phone
Your phone contacts a base station
The base station contacts the MTSO
The MTSO connects you to the other device
You talk to the person on the other device.
how many molecules of CO2 would 700g be?
Answer:
13
Explanation:
Why is there an attraction between the two ions in this chemical bond?
Answer:
A metallic bond is a force of attraction between charged metal ions and the electrons that are in the delocalized bond, which covers the assembly of ions. A covalent bond is the force of attraction between the nuclei of atoms, and the electrons shared between them.
Explanation:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond can be generated by electrostatic attraction between charged ions (for example, ionic bonds) or by electron sharing (for example, covalent bonds).
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This graph represents an endothermic reaction. What does it show about the potential energy of reactants and products? Abuzua nunuad in Reaction progress A. The comparison of potential energy depends on what the reactants and products are, B. The potential energy of the products is greater than the potential energy of the reactants C. The potential energy of the reactants equals the potential energy of the products D. The potential energy of the reactants is greater than the potential energy of the products,
Answer:
The potential energy of the products is greater than the potential energy of the reactants
Explanation:
i just took the test
In an endothermic reaction, activation potential energy of reactants is less than that of the products. Reactants in endothermic reaction are absorbing enough heat energy to overcome this barrier potential. Hence, option B is correct.
What is an endothermic reaction?An endothermic reaction is the one in which heat energy is absorbed by the reactants from the surroundings. In endothermic reactions, the enthalpy change is positive.
The minimum energy that the reactants have to acquire for effective collision and reaction is called the activation energy. By absorbing heat energy reactants becomes more energetic and overcome this activation potential.
Therefore, in an endothermic reaction, the activation potential of products will be higher than that of the reactants and the energy diagram clearly exhibit this transition in energy. Hence, option B is correct.
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Which statement represents photosynthesis?
Answer:
brainliest plss
Explanation:
Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This process occurs in plants and some algae. Photosynthesis can be represented using a chemical equation.
Se tienen 1.5 litros de hipoclorito de sodio concrntrado (6.1%) y se requiere preparar 1.0 litros de hipoclorito de sodio al 0.5% URGE!!!!!! POR FAVOR
Answer:
Tomar 82 mL de solución concentrada y agregar agua hasta un volumen final de 1.0 L.
Explanation:
Tenemos una solución concentrada de hipoclorito de sodio, cuya concentración es 6.1%, por lo tanto:
Cc = 6.1 %
Y debemos hacer una dilucion para obtener una solucion diluida con:
Cd = 0.5%
Vd = 1.0 L
Por lo tanto, podemos usar la siguiente fórmula para calcular el volumen a tomar de solucion concentrada (Vc):
Cc x Vc = Cd x Vd
⇒ Vc = (Cd x Vd)/Cc = (0.5% x 1.0 L)/6.1% = 0.082 L
0.082 L x 1000 mL/1 L = 82 mL
Por lo tanto, para preparar la solución debemos tomar 82 mL de solucion concentrada de hipoclorito de sodio 6.1% y agregar agua hasta un volumen final de 1.0 L.
PLEASE HELP
Balance this equation.
___PH3 ——-> ___ P2 + H2
Answer:
2PH3 = P2 +3H2
Explanation: