Answer: science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe
Explanation:
Answer:
Science is a very Idiot subject and doing dimag ka dahi xD
how to write an article?
Answer:
essay typer.com click the first link
What is a empirical formula
Answer:
The empirical formula of a compound is the simplest whole number ratio of atoms of each element in the compound. It is determined using data from experiments and therefore empirical.
For example, the molecular formula of glucose is C 6H 12O 6 but the empirical formula is CH 2O.
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Answer:
a chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule CH2O is the empirical formula for glucose.
Consumers must eat other organisms
for energy. Which organisms
are consumers in this food chain?
Answer:
frog-snake+-Eagle
Explanation:
___&&&-(_(-7&&((-&(_((-_(_-8&:"&&7+_&(&_
When a lead acid car battery is recharged by the alternator, it acts essentially as an electrolytic cell in which solid lead(II) sulfate PbSO4 is reduced to lead at the cathode and oxidized to solid lead(II) oxide PbO at the anode. Suppose a current of 17.0A is fed into a car battery for 15.0 seconds. Calculate the mass of lead deposited on the cathode of the battery. Be sure your answer has a unit symbol and the correct number of significant digits.
Answer:
0.273504 grams
Explanation:
Charge Deposited = Current ×Time
q=It
Given: I= 17.0A, t= 15.0 seconds
Q= 17×15= 255 C
Since, 1 mole contains 96500C of charge deposition
Therefore, number of moles = 255/96500 = 0.00264 moles
Moreover, since Pb changes to Pb2+,
Hence number of moles of Pb deposited = 0.00264/2
= 0.00132
Also, Molar mass of Lead = 207.2 gm/mol
Therefore, the mass of lead deposited = 0.00132×207.2 = 0.273504 grams
.
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For 2-methylbutane, the AH° of vaporization is 25.22 kJ/mol and the
AS° of vaporization is 84.48 J/mol K. At 1.00 atm and 201 K, what is
the AG° of vaporization for 2-methylbutane, in kJ/mol?
Answer:
ΔG° = ΔH° - TΔS°
ΔG° = 25.22-(201 )(0.08448)
ΔG° = 8.24 kJ/mol
The standard free energy is obtained as 8.2 kJ/mol.
We know that; ΔG° = ΔH° - TΔS° where;
ΔG° = standard free energy
ΔH° = standard enthalpy
T = temperature
ΔS° = standard entropy
Hence substituting the values;
ΔG° =25.22 kJ/mol - (201 K * 84.48 J/mol K)
ΔG° = 25.22 * 10^3 J/mol - 16980.5 J/mol
ΔG° = 8.2 kJ/mol
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Approximately what mass of potassium nitrate will eventually precipitate from a supersaturated solution containing 19 grams of the solute in 28 grams of water at 40C°?
A supersaturated solution contains more solute at a given temperature than is needed to form a saturated solution.
Increased temperature usually increases the solubility of solids in liquids.
For example, the solubility of glucose at 25 °C is 91 g/100 mL of water. The solubility at 50 °C is 244 g/100 mL of water.
If we add 100 g of glucose to 100 mL water at 25 °C, 91 g dissolve. Nine grams of solid remain on the bottom. We have a saturated solution.
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Ionic, metallic, or covalent??? Need now
Answer:
Covalent
Explanation:
What is the percent by mass of aspartame in iced tea that has 0.75 g of aspartame in 250 g of water?
Answer:0.30%
Explanation:
______ is the process of change from a liquid to a gas at temperatures below the boiling
point.
Answer:
evaporation is the process
Answer:
EvaporationExplanation:
Evaporation is the process of becoming a vapor. The process of extracting moisture as by heat.
Evaporation is the process of change from a liquid to a gas at temperatures below the boiling point.
Therefore, the final answer is evaporation.
What is a solution?
A. The substance that is dissolved in another substance
B. The mixture of one substance dissolved in another
C. The substance that dissolves another substance
D. Two liquids that do not mix with each other
SUR
Answer:
B
Explanation:
this is because solution is the mixture of a solvent and a solute to give you a solution
Answer:
B. The mixture of one substance dissolved in another
Explanation:
What is the name of Na
Do frogs start their life cycle on land or water?
The answer is water because they lay eggs in water
4. Which of the following process is NOT part of wool extraction?
(a) Shearing (b) Scouring (c) Sorting
(d) Reeling
Answer:
Reeling is the only process not listed.
The correct answer is option D: Reeling.
Wool is obtained from sheep. The wool so obtained is processed according to the following flow chart;
Shearing → Scouring → Sorting → Dyeing → Straightening, Rolling and Combing
Shearing is the removal of the fleece and thin skin of the sheep. Scouring is the process of washing the hair to remove grease, dust, and dirt. Sorting is the process of differentiating the fibers.
Hence, reeling is not a process in wool extraction.
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A student needs to dilute a 0.25 M Pb(NO3)2 solution to make 73.0 mL of 0.13 M Pb(NO3)2 . Set up the calculation by placing the values with the correct units into the equation. Then, calculate the volume, in milliliters, of the 0.25 M Pb(NO3)2 solution that is needed.
Answer: Volume of 0.25 M solution is 38 ml
Explanation: Amount of substance n remains same.
n = c1V1 = c2V2 Solve V2 = V1c1 / c2 = 73,0 ml · 0.13 M / 0.25 M = 37.96 ml
Which food is the most complete source of amino acids?
A. Bread
B. Fruit
C. Butter
D. Meat
Answer:
D.Meat
Explanation:
Meat-Most animals proteins are considered complete and high-quality.This includes red meat, poultry,and dairy products.
Amino acids are the molecules that make the protein and are essential nutrients. Meat is the best source that will have amino acids. Thus, option D is correct.
What are amino acids and proteins?Amino acids are the building blocks that make the macromolecule, a protein required for functioning, strength, and activities of the body. Amino acid-containing foods like eggs, meat, and soybeans are rich in proteins.
Amino acids and proteins are essential for body growth and repair that can be gained from poultry sources like eggs, meat, fish, cheese, quinoa, beans, etc. Bread, fruits, and butter are rich in carbohydrates.
Therefore, option D. meat is rich in amino acids.
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What is The metric unit for volume ?
Answer:
milliliters
Explanation:
Is going to be milliliters because in the metric system of measurement,the most common unit of volume are milliliters and liters
Can anyone please help?
Answer:
Earth
Explanation:
Earth is unique in the fact that we have an oxygen-rich atmosphere
to the nearest gram, what is the mass of of one spoonfull of sugar? g
Answer:
the mass of one spoonful of sugar to nearest gram is 10g
1st law of motion law of inertia in toy story 2
Which of these is a good conductor?
Plastic
Rubber
Wood
Metal
→ Search the internet to understand the reaction between (Zno) & (HNO3).
a) Describe what happens to the first spoonful of powder when he mixes it with the acid.
b) Describe what would happen if the student kept adding zinc oxide to the nitric acid
after the reaction between the acid and metal oxide was complete.
Answer:
See Explanation
Explanation:
The equation of the reaction is;
ZnO(s) + 2HNO3(aq) --------> Zn(NO3)2(aq) + H2O(l)
a) When you first add ZnO to aqueous HNO3, the powder dissolves as it mixes with the acid.
b) If the student keeps on adding more ZnO powder to the HNO3 after the reaction between the acid and metal oxide was complete, the powder will no longer dissolve in the acid. At this point, the reaction has attained equilibrium.
The blank
and
blank
of atoms are the same on both sides of
a chemical equation.
Please just answer the question directly instead of giving me some weird cryptic answer that I can’t use. I’ve seen this exact question answered before and nobody would give a straight answer.
Which of the following contains the least amount (number) of molecules?
Group of answer choices
5.0 g O2
5.0 g H2O
5.0 g N2
5.0 g CO2
Suppose Gabor, a scuba diver, is at a depth of 15m15m. Assume that: The air pressure in his air tract is the same as the net water pressure at this depth. This prevents water from coming in through his nose. The temperature of the air is constant (body temperature). The air acts as an ideal gas. Salt water has an average density of around 1.03 g/cm3g/cm3, which translates to an increase in pressure of 1.00 atmatm for every 10.0 mm of depth below the surface. Therefore, for example, at 10.0 mm, the net pressure is 2.00 atmatm. What is the ratio of the molar concentration of gases in Gabor's lungs at the depth of 15 meters to that at the surface
Answer:
The ration of molar concentration is "2.5".
Explanation:
The given values are:
Average density of salt water,
= [tex]1.03 \ g/cm^3[/tex]
Net pressure,
= [tex]2.00 \ atm[/tex]
Increase in pressure,
= [tex]1.00 \ atm[/tex]
Now,
The under water pressure will be:
= [tex]\frac{15 \ m}{10}\times 1 \ atm +1 \ atm[/tex]
= [tex]1.5\times 1+1[/tex]
= [tex]1.5+1[/tex]
= [tex]2.5 \ atm[/tex]
hence,
The ratio will be:
= [tex]\frac{(\frac{n}{V})_{15m} }{(\frac{n}{V})_{surface} }[/tex]
or,
= [tex]\frac{P}{P_s}[/tex]
= [tex]\frac{2.5}{1}[/tex]
= [tex]2.5[/tex]
What is the percent by mass of magnesium in a 1000 g sample of ocean water (solution) that has 1.36 g of magnesium ions?
Answer:
So the percentage mass of Magnesium in ocean water is 0.13%.
Explanation:
brainliest pls
Calculate the Ka of a 0.35M weak acid with a pH of 4.2.
Answer:
Ka = 1.14x10⁻⁸
Explanation:
First we calculate [H⁺] from the pH:
pH = -log[H⁺][H⁺] = [tex]10^{-pH}[/tex][H⁺] = 6.31x10⁻⁵ MFor a monoprotic weak acid, the molar concentration of H⁺ of a solution can be expressed as:
[H⁺] = √(C*Ka)Where C is the molar concentration of the weak acid solution.
6.31x10⁻⁵ M = [tex]\sqrt{0.35M*Ka}[/tex]1.14x10⁻⁸ = Katwo differences between weather and climate
subject-science
Answer:
weather- rain, hail, snow, sunny, dry, etc.
climate- warm, cold, humid, dry, etc.
Explanation:
The difference if weather and climate is that climate is the way the temperature is, whether it's warm, cold, humid, dry. While weather is the state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.
A tau lepton decays into an electron, an electron antineutrino and a tau neutrino. Write out this reaction in symbolic (equation) form and show that charge and lepton number is conserved. 2. What is the total number of quarks in a helium nucleus consisting of 2 protons and 2 neutrons
The equation in the symbolic form can be written as,
[tex]\tau \;- > e- + {\bar{\nu }} e + \nu\tau[/tex]
The total number of quarks in a helium nucleus consisting of 2 protons and 2 neutrons is 12 quarks.
What is the meaning of lepton?Any of a family of particles (such as electrons, muons, and neutrinos) that have spin quantum number ¹/₂ and that experience no strong forces.
The equation in the symbolic form can be written as,
[tex]\tau \;- > e- + {\bar{\nu }} e + \nu\tau[/tex]
Charge on the left side = -1
Charge on the right side = -1+0+0 = -1
As the charge on the electron antineutrino, [tex]{\bar{\nu }}[/tex] e and the tau neutrino, [tex]\nu\tau[/tex] are zero each.
Thus, charge on left side = charge on right side
Or, the equation is in accordance with charge conservation.
Lapton number of left side = 1
Laptop number of right side = 1-1+1 = 1
This is because, lapton number of the particles involved are,
Tau lapton, [tex]\tau[/tex]-1 = 1,
Electron, e-1 = 1,
Electron antineutrino, [tex]{\bar{\nu }}[/tex]e = -1,
Tau neutrino, [tex]\nu\tau[/tex]= 1,
Thus, lapton number of left side = lapton number of right side
So, the equation obeys lapton number conservation.
2.
The total number quarks in a helium nucleus which is composed of 2 protons (positively charged particle) and 2 neutrons (uncharged particle) is:
Since there 3 quarks in each nucleon, 4 nucleons would have a total of 12 quarks.
Just simply multiply 3 quarks by the number of nucleons:
So, 3 (quarks) x 4 (nucleons) = 12 quarks
Therefore, there are 12 quarks in 4 nucleons.
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Draw the most stable form of the major product in the reaction. 2 equivalents of an ester react with N a O C 2 H 5, followed by H 3 O plus and C 2 H 5 O H. The ester is a carbonyl bonded to a 3 carbon chain and O C H 2 C H 3.
Answer:
See answer below
Explanation:
This is a Claisen condensation. In the picture below you have the mechanism and final product.
Hope this helps