Answer:
Yes, she will be able to recover enough magnesium chloride from the original flask to continue the experiment
Explanation:
The solution prepared by the scientist contains 12.7g of magnesium chloride. The sunlight will evaporate only the water present. When the volume decreases, the magnesium chloride precipitates. When all water evaporates, all the solute, magnesium chloride precipitates totally.
That means she will recover the 12.7g of magnesium chloride.
Answer: Yes, she will be able to recover 12.7g in the flask
Explanation: Founders Educere answer
[OH-] is 5.62x10-9 56.2x10-9 O 1.78 x10-6 o 17.8 X10-9
Answer: What are you in, fudging grade two-thousand???
Which component is missing from the process of photosynthesis? carbon dioxide water _________ → glucose oxygen sunlight sugar plants carbon
The component missing from the process of photosynthesis is carbon dioxide. Carbon dioxide is an essential component of photosynthesis as it is used by plants to create glucose, which is the primary energy source for plants.
What is Carbon dioxide?Carbon dioxide (CO2) is a colorless, odorless gas that is produced when carbon-containing compounds are burned. It is one of the most abundant trace gases that make up the Earth’s atmosphere. Carbon dioxide is important in the Earth’s natural cycle of life as plants use it to produce food through photosynthesis, while animals and humans exhale it as a waste product. In the atmosphere, carbon dioxide acts as a greenhouse gas and helps regulate the Earth’s temperature.
Carbon dioxide is taken in by the leaves of the plant and then combined with water and energy from sunlight to form glucose. Without carbon dioxide, photosynthesis would not be possible.
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Answer: The Correct Answer is A. Sunlight
Carbon Dioxide + Water + Sunlight → Glucose + Oxygen
Explanation: I took the test and got it right.
Have a Great Day.
Slow moving gas molecules means
YALL HELP MEEE
Answer:
The gas has been cooled down
Explanation:
molecules move slower and slower and have less and less kinetic energy if you cool it down but it also has something to do with how big the particles are, how heavy they are, and their temperature. If the particles are heavier and bigger they will move slower.
And if their temperature is colder that will also cause them to move slower. Hope this helps!!
How popular is hydroelectric power?
Hydroelectric power is one of the oldest and most widely used renewable sources of energy.
Globally we see that hydropower is by far the largest modern renewable source. Every country's top priority is to generate hydroelectric power so they have to rely less on nuclear and coal power plants.
Hydroelectric power is generated by using the elevation difference, created by a dam or diversion-like structure of water flowing in on one side and out, far below, on the other side.
If we talk about some countries, Hydropower currently generates 31.5% of total U.S. renewable electricity generation.
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if a reaction takes place using all oxygen available and leaving hydrogen available:
Answer:
If a reaction takes place using all oxygen available and leaving hydrogen available, then oxygen is the limiting reactant.
Explanation:
The reaction used up all the oxygen and left over some hydrogen, so oxygen is the liting reactant.
Part A
Which of the following best describes the side chain of arginine at a pH of 11?
nonpolar
uncharged but polar
charged and polar
aprotic
hydrophobic
Charged and polar is incorrect. My textbook says the pKa of the sidechain is 12.48. Can you please explain what the correct answer is?
At a pH of 11, the side chain of arginine would be positively charged (NH3+) and polar.
This is because the pKa of the guanidine group (NH2) in the side chain of arginine is 12.48, which means that at a pH greater than 12.48, the guanidine group will be protonated and carry a positive charge. Since the nitrogen atom in the guanidine group is also surrounded by hydrogen atoms, the side chain is polar.
Key points:
The side chain of arginine is a guanidine group (NH2).The pKa of the guanidine group is 12.48, which means that at a pH greater than 12.48, the guanidine group will be protonated (NH3+).When protonated, the guanidine group carries a positive charge.The nitrogen atom in the guanidine group is surrounded by hydrogen atoms, which makes the side chain polar in nature.Learn more about arginine here:
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The enthalpy of solution of KBr in water is about 198 kJ/mol. Nevertheless, he solubility of KBr in water is relatively high. Why does the solution process occur even though it is endothermic?
The process of dissolution of KBr in water occurs because the final solution has a lower energy state than the two components separately.
What do you mean by endothermic?
Endothermic reactions are chemical reactions that absorb energy from their surroundings in order to proceed. This energy is usually in the form of heat and is absorbed from the surroundings in order to drive the reaction forward.
Even though the dissolution process is endothermic, it occurs because the enthalpy of solution is less than the sum of the enthalpies of the two components separately. The enthalpy of solution is the energy required to break the strong ionic bonds between the KBr molecules, allowing them to dissolve into the solution. The energy released from the formation of new hydrogen bonds between the KBr molecules and the water molecules is greater than the energy needed to break the ionic bonds, resulting in a net release of energy. This release of energy causes the overall process to be exothermic, even though the dissolution of KBr into water is endothermic.
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NO links, please! I will be reporting and reporting all of the other links you answer
Answer:
This should be correct "The biggest advantage of sexual reproduction versus asexual reproduction is genetic diversity. When a single organism reproduces asexually it produces an exact copy of the parent organism."
Explanation:
sorry that I'm late but brainliest ....... please...................., maybe............... ?????
If you see an uncharacterized container that has a white crystalline residue on the outside, what should you do
What numbers do I put on the right side?
The leftovers of [tex]C_2H_2[/tex] will be 6 moles while the leftover of [tex]O_2[/tex] will be zero.
Mole ratio of reactantsIn the originally balanced equation of the reaction, 2 moles of [tex]C_2H_2[/tex] and 5 moles of [tex]O_2[/tex] react completely to produce 4 moles of [tex]CO_2[/tex] and 2 moles of [tex]H_2O[/tex]. This equation is balanced with no reactant left.
Now, 8 moles of [tex]C_2H_2[/tex] were made to react with 5 moles of [tex]O_2[/tex] in the second reaction. The mole ratio of the two reactants for complete reactions is 2:5. Thus, [tex]C_2H_2[/tex] has been supplied in excess.
Since only 5 moles of [tex]O_2[/tex] is available, only 2 moles of [tex]C_2H_2[/tex] will be consumed. Thus, 6 moles of [tex]C_2H_2[/tex] will be left while the oxygen will be completely consumed. That is, the amount of [tex]O_2[/tex] left would be zero.
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Darwin observed how farmers and breeders produced many kinds of farm animals and plants. These plants and animals had traits that were desired by the farmers and breeders. He also noticed how the study of similar body structures and vestigial organs could add to the evidence of evolution. After performing several breeding experiments, he came to certain conclusions and formulated some theories. His theory of evolution and natural selection is the most accepted one.
What is the reason behind the acceptance of Darwin's theory?
Responses
A It is based on the practical example of Lamarck’s theoryIt is based on the practical example of Lamarck’s theory
B It is supported by its harmonizing with other views.It is supported by its harmonizing with other views.
C It is based on the ideas of earlier hypothesis and laws.It is based on the ideas of earlier hypothesis and laws.
D It is supported by practical evidence and examples.
The reason behind the acceptance of Darwin's theory is D It is supported by practical evidence and examples.
What is the theory of evolution proposed by Charles Darwin?The theory of evolution proposed by Charles Darwin is a well sustained model that explains how animals change in order to adapt to an ever-changing enviroment, which is supported by scientific evidence and observations.
Therefore, with this data, we can see that the theory of evolution proposed by Charles Darwin is well sustained by evidence obtained from experimentation and also observations of the natural world.
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Gas is collected over water at 25 °C. The pressure in the container was 0.13 atm. Using a vapor pressure chart, what is the pressure of the dry gas?
Answer:
[tex]p_{gas}=0.0987atm[/tex]
Explanation:
Hello there!
In this case, according to this problem about partial pressures, we first use the Dalton's law in order to realize how the vapor pressure of water and the partial pressure of the gas contribute to the total pressure:
[tex]P_T=p_{H_2O}+p_{gas}[/tex]
Thus, since the vapor pressure of water at 25 °C is 0.0313 atm, the partial pressure of the gas turns out to be:
[tex]p_{gas}=P_T-p_{H_2O}\\\\p_{gas}=0.13atm-0.0313atm\\\\p_{gas}=0.0987atm[/tex]
Regards!
Calculate the percentage composition (by mass) of oxygen in K2SO4.
36.72 %
18.35 %
9.18 %
23.66 %
76.34 %
Answer:
it's option no A as described in the image
NAME AN ISOMER OF:
CH2CHCH2CH3
Which of the following statements is true?
A. The change in freezing point of a solution is directly proportional to the number of
solute particles in the solution and dependent on the type of particle.
B. The change in freezing point of a solution is directly proportional to the number of
solute particles in the solution and independent of the type of particle.
C. The change in freezing point of a solution is inversely proportional to the number
of solute particles in the solution and dependent on the type of particle.
D. The change in freezing point of a solution is inversely proportional to the number
of solute particles in the solution and independent of the type of particle.
Answer:
The effect of adding a solute to a solvent has the opposite effect on the freezing point of a solution as it does on the boiling point. A solution will have a lower freezing point than a pure solvent. The freezing point is the temperature at which the liquid changes to a solid.
Explanation:
Hope this helps :3
The change in freezing point of a solution is inversely proportional to the number of solute particles in the solution and dependent on the type of particle,is the the TRUE statement.
What is meant by freezing point?Freezing point, temperature at which a liquid becomes a solid. As with the melting point, increased pressure usually raises the freezing point. The freezing point is lower than the melting point in the case of mixtures and for certain organic compounds such as fats.The change in freezing point of a solution is inversely proportional to the number of solute particles in the solution and dependent on the type of particle,is the the TRUE statement.
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HELP FOR MY FINAL PLEASE PLEASE
For average speed, we divide the total distance covered by the total time taken.
After doing that, you will see that Jane has the lowest average speed.
Please help!
Given the following reaction,
3H2SO4(aq)+Ca3(PO4)2(s)⟶3CaSO4(s)+2H3PO4(aq)
If 1.25x10^5 kg of H2S)4 react, how many kilograms of H3PO4 are produced?
Thank you!
Answer:
8.3 × 10⁴kg
Explanation:
Solution in the diagram
Consider the combustion of propane:
C3H8 +502 3CO2 + 4H₂O
- →
Which of the following unit factors below is correct? (Select all that may apply)
A. There are 5 oxygen molecules reacting for every six oxygen atoms produced in CO2.
B. There are 5 oxygen atoms reacting for every 3 CO₂ molecules produced.
C. There are 10 oxygen atoms reacting for every four water molecules produced.
D. There are 10 oxygen atoms reacting for every six oxygen atoms produced in CO2.
Four water molecules are created for every ten oxygen atoms that are reacting.
Propane:A three carbon alkane, propane has the chemical formula C3H8. At room temperature and pressure, it is a gas, but it can be compressed into a liquid for transportation.
What is the primary use of propane?Its primary applications include home and water heating, food preparation and storage, clothing drying, and the powering of industrial and farm machinery. The production of plastics and other chemicals in the chemical sector also uses propane as a raw ingredient.
What are propane's three drawbacks?Cons of propane heating
Compared to oil heating, propane produces fewer BTUs per gallon.Equipment that burns propane is frequently more expensive to buy than heating systems that use heating oil.To use the apparatus properly, care must be taken because propane is flammable in air.To know more about alkane :
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at what temperature will the mass of 198g of carbon dioxide gas at 2 atmospheric pressure take up to a volume of 35l? (gas constant= 0.0821L atm.
Answer:
The temperature will be 189.70 K.
Explanation:
Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
In this case:
P= 2 atmV= 35 Ln= 198 g* [tex]\frac{1 mole}{44 g}[/tex] = 4.5 moles (where 44 g/mole is the molar mass of carbon dioxide)R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= ?Replacing:
2 atm* 35 L= 4.5 moles* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] * T
Solving:
[tex]T=\frac{2 atm* 35 L}{4.5 moles* 0.082\frac{atm*L}{mol*K} }[/tex]
T= 189.70 K
The temperature will be 189.70 K.
Please show work image below includes the questions.
Answer:
Calcium nitride (Ca3N2)
148.25 g/mol is the molar mass
what happens to the speed of a sound wave from an underwater animal as the sound passes into the air above?
A. It stays the same
B. It falls to zero
C. It decreases
D. It increases
Definition of RMA in chemistry pls
Answer:
Molecule name: N--N-METHYL-N-PROP-2-YNYLAMINE
Formula: C13 H15 N
Molecular weight: 185.265 Da
RMA-3 (Rubidium Microporous Aluminosilicate-3) was hydrothermally synthesized from rubidium–aluminosilicate gels without using any organic or inorganic additives, and its structure determined by XRD Rietveld analysis was confirmed as a novel framework topology containing two 8-membered ring pore-openings with dimensions of 0.49 × 0.37 nm and 0.34 × 0.38 nm
Answer:
Hey there! Just wanted to let you know that the term RMA stands for "relative molecular mass" in chemistry. This is a measure of the size of a molecule, calculated by adding up the atomic weights of all the atoms in the molecule. For example, the relative molecular mass of water (H2O) is 18, because the atomic weight of hydrogen (H) is 1 and the atomic weight of oxygen (O) is 16. The relative molecular mass of a molecule is typically expressed in atomic mass units (amu) and can be useful for characterizing and comparing different substances, and predicting their physical and chemical properties.
Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there
Thus, Option (C) Glucose has a maximum of 72 C-atoms per gram. The components of fossil fuels are decaying plants and animals.
These fuels may be burned to provide energy and can be found in the crust of the Earth. An example of a fossil fuel is coal, as well as oil and natural gas. Due to the hydrocarbons and other carbon-based compounds they contain, fossil fuels are valuable as energy sources. Any of a class of organic molecules made solely of carbon and hydrogen are known as hydrocarbons. The hydrogen atoms adhere to the carbon atoms, which serve as the "skeleton" or framework. Because they were generated from the petrified, buried remains of plants and animals that once lived millions of years ago, coal, crude oil, and natural gas are all referred to as fossil fuels.
The complete question is- Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 875 million years, what fraction of the initial 14C atoms is still there?
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What is the correct Lewis structure for Group 5A element, Arsenic?
.As. :AS
As
:
• As.
...
A.
B.
C.
D.
A.
A
B.
B
C.
с
D. D
Answer:
As
Explanation:
because of ionic bond
(HURRY) Watch the Candy Shop video. In this reaction, a student determined that the mass of the carbon product was less than the mass of the sulfuric acid and sugar that were combined. How would you account for this loss of mass? Use evidence and scientific reasoning to support your answer
The loss of mass can be accounted for by the energy released during the reaction. When the sulfuric acid and sugar mix, the reaction produces carbon dioxide gas, which has a much lower mass than the original reactants. This is because the reaction releases energy as heat, which causes the molecules to break apart and form the gaseous carbon dioxide.
What is molecule?Molecule is the smallest unit of a substance that has all the properties of that substance and is made up of two or more atoms bonded together. Molecules can either be made of elements or a combination of elements and compounds. Molecules can be described as the building blocks of matter, made up of atoms. Atoms are made up of protons, neutrons, and electrons, and the arrangement of these particles determine the type of molecule.
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Which of the following is incorrect:
A. Protons contribute to the mass of the atom
B. Electrons have a negative charge
c. Neutrons are found in the nucleus of the atom
d. Electrons, neutrons and protons all have the same mass
Answer: D
Explanation:
electrons have no mass
6. Which subatomic particle has no charge?
O proton
O electron
O neutron
Answer:
O Neutron
Explanation:
Answer:
the anwser is
electronHOPE IT HELPEDAt room temperature I2(s) is a molecular solid. Which of the following provides a characteristic of I2(s) with a correct explanation ?
(A) It has a high melting point because it has (B) It is hard because it forms a three-dimensional covalent network
(C)It is not a good conductor of electricity because its valence electrons are localize in bonding and nonbonding pairs. (D) It is very soluble in water because its molecules are polar.
At room temperature I₂(s) is a molecular solid. the correct explanation is : (C)It is not a good conductor of electricity because its valence electrons are localize in bonding and nonbonding pairs.
The Iodine , I₂ is the example of the molecular solid. the iodine is the good conductor of the electricity due to the valence electrons that are localized in the bonding pairs and the non bonding pairs. the iodine is the element in the periodic table with the atomic number 53. the iodine is the non metallic solid at the room temperature.
The iodine exists as the diatomic form. the each iodine molecules present as the two iodine as I₂ . this is the reason it is called as molecular solid.
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SI unit is 10 times smaller than the next smallest unit. Ture or false?
Answer:
the answer is true
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If you need 18.9 grams of HCl for a reaction, and you have a 1.5 M solution of HCl, how many mL of this solution should you use
If we need 18.9 grams of HCl for a reaction, and we have a 1.5 M solution of HCl, the mL of this solution should we use is 345.3 mL.
Given that :
mass of the HCl = 18.9 grams.
molar mass of the HCl = 36.45 g/mol
moles of the HCl = mass / molar mass
= 18.9 / 36.45
= 0.518 mol
the molarity of the HCl = 1.5 M
The molarity is given as:
molarity = moles / volumes
volume in L = moles / molarity
= 0.518 / 1.5
= 0.3453 L
= 345.3 mL
Thus, the volume is 345.3 mL.
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