Answer:
3.0 g
Explanation:
The total mass at the beginning of the reaction is:
3.8 g + 10.8 g = 14.6 gFollowing the law of conservation of mass, this same mass has to be present once the reaction is complete. This means that the mass diference between the contents of the reaction vessel after the reaction and the mass at the beginning of the reaction is the mass of released carbon dioxide:
14.6 g - 11.6 g = 3.0 gIn which phase of wound healing is fibrin most involved?
Answer:
Finally, coagulation occurs and reinforces the platelet plug with threads of fibrin which are like a molecular binding agent. The hemostasis stage of wound healing happens very quickly.
Explanation:
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1. How many grams of water are in a cup containing
0.1 moles of H2O?
Answer:
Explanation:
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What cell structure is best represented by the image?
A.
a non-permeable cell wall
B.
a selectively permeable membrane
C.
a waterproof nuclear envelope
D.
a permeable exoskeleton
Answer:where is the image
Explanation:
Answer:
B.
a selectively permeable membrane
Explanation:
Write and balance the equation for the neutralization reaction between phosphoric acid and
sodium hydroxide.
Answer: H3PO4(aq)+3NaOH(aq)→Na3PO4(aq)+3H2O(l)
Explanation:
How many electrons are in the highest occupied energy level of a neutral chlorine atom?
How many Moles are there in 8.55 x 10^24 molecules of NaCl?
Answer:
Moles = avogadro's constant divided by the number of molecules.
15. Objects can have kinetic energy, potential energy, or both. Energy can be in the form of motion. Energy can
also be stored by objects in various ways, including position, chemical bonds, or physical state.
Which statement is true? And why?
a. An object’s mass has no effect on its potential energy.
b. Potential energy is converted to kinetic energy as a stationary object begins to move.
c. Kinetic energy is converted to potential energy as a stationary object begins to move.
d. A stretched rubber band stores no energy.
Answer: b because Potential energy is converted to kinetic energy as a stationary object begins to move.
Explanation:
The average kinetic energy of a sample of water molecules is –
a. always equal to zero
b. increased as the temperature is decreased
c. increased as the temperature is increased
d. unaffected by temperature changes
Answer:
c. increased as the temperature is increased
Explanation:
The average kinetic energy of a sample of water molecules is increased as the temperature is increased. Hence, option C is correct.
What is average kinetic energy?The average kinetic energy of the particles in a gas is proportional to the
temperature of the gas. Because the mass of these particles is constant,
the particles must move faster as the gas becomes warmer.
The average kinetic energy of gas molecules is directly proportional to
absolute temperature only; this implies that all molecular motion ceases
if the temperature is reduced to absolute zero.
Hence, option C is correct.
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Why do we need cells to divide? Give two examples.
Answer:
Cells need to divide to reproduce.
Explanation:
They go through numerous stages, such as mitosis to further replicate themselves. They can't get things done alone, so they have to work in numbers.
A community located downwind from a coal-fired power plant has seen a recent increase in the number of dead and dying trees. A so scientist measured values for the following parameters before and after the trees died off. Which of the following oil data should be used to determine if the coalfired power plant emiations were the cause of the damage to the trees
a. Moisture content and water retention
b. Parent material composition
c. Pesticide and herbicide residue levels
d. Calcium and aluminum levels
Answer:
Option D, Calcium and Aluminum levels
Explanation:
The coal fired power plant releases huge amount of particulate and gaseous emissions such as mercury, sulphur dioxide, nitrogen oxide etc. When there is rain, these gaseous and particulate matter comes to the ground along with rain water and pollute the soil. There are also chances of acid rain due to the presence of sulphur dioxide. Polluted soil and acid rain negatively impact the growth of the plants and causes leaching of Aluminium thereby decreasing the availability of calcium for the plants. Thus, the trees die. Hence, if the amount of Aluminium and Calcium in soil is determined, one can easily deduce the cause of death of trees.
Hence, option D is correct
What number should be written in front of Na to balance the equation?
Na + MgCl2 → NaCl + Mg
1
2
3
4
In order to balance the chemical equation, the coefficient of Na should be 2.
Suppose the available nutrients in the soil of an ecosystem decrease. Over time, which adaptation is MOST LIKELY to evolve among the plants that survive there?
Answer:
Root system will become larger or extend farther
Explanation:
If nutrient in soil decrease, the plant's roots system will likely become larger and extend out deeper and farther to get all the nutrients it possibly can
How do the equilibrium concentrations of the reactants compare to the equilibrium concentrations of the product?
Answer: It depends equilibrium constant K
Explanation: You need to to have reaction formula.
If K >> 1 then concentrations of products are much bigger than
concentrations of reactants. If K < < 1, concentration of products is small.
Which force is most responsible for binding together an atom’s protons and neutrons?
electrostatic
gravitational
nuclear
magnetic
gravitational force is most responsible for binding together an atom’s protons and neutrons.
What is gravitational force?In physics, gravity (from Latin gravitas 'weight') is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is by far the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.
On Earth, gravity gives weight to physical objects, and the Moon's gravity causes tides in the oceans. Gravity also has many important biological functions, helping to guide the growth of plants through the process of gravitropism and influencing the circulation of fluids in multicellular organisms. Investigation into the effects of weightlessness has shown that gravity may play a role in immune system function and cell differentiation within the human body.
The gravitational attraction between the original gaseous matter in the Universe allowed it to coalesce and form stars which eventually condensed into galaxies, so gravity is responsible for many of the large-scale structures in the Universe. Gravity has an infinite range, although its effects become weaker as objects get farther away.
Learn more about gravitational force
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Can someone please help me out, I need to do this asap. Tired of bots responding my questions and would have to report it instantly
Answer:
Solution given:
Required reaction is:
2H2+O2➔2H2O
now
10.
oxygen have 16 amu than total mass in the left side of oxygen is:
16×2=32 amu of Oxygen
11.
total mass of Oxygen in product side is;
16×2=32 amu of Oxygen
Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
Answer: Ratio : 4, 3, 4, 3 are the answers.
Explanation:
1.. A saturatedsolutionA.contains more solute thansolvent.B.contains more solvent thansolute.C.contains equal moles of solute andsolvent.D.contains the maximum amount of solute that will dissolve in that solvent at that temperature.E.contains a solvent with only sigma bonds and no pi bonds (i.e. only single bonds, with no doubleor triplebonds).
Answer:
D. contains the maximum amount of solute that will dissolve in that solvent at that temperature.
Explanation:
Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.
For example, sodium chloride (NaCl) when mixed with water dissociates into sodium and chloride ions. Thus, salt (sodium chloride) is said to be soluble because it dissolves completely in water.
Hence, a compound that dissolves in water to produce an aqueous solution is said to be soluble in water. Also, the solute of an aqueous solution that conducts electricity is called an electrolyte.
In Chemistry, dissolution can be defined as the process of dissolving or dissociating a solute in solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution. For dissolution to occur in solids, the crystalline structure of the substance must be broken up so as to release ions, atoms or molecules to produce a solution. For liquid and gases, the substance to be dissolved must form a non-covalent bond with the solvent to produce a solution.
Generally, a saturated solution contains the maximum amount of solute that will dissolve in that solvent at that temperature.
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2. What is the molarity of a 0.30 liter solution containing 0.50 moles of NaCl?
3. Calculate the molarity of 0.289 moles of FeCl, dissolved in 120 ml of solution?
4. If a 0.075 liter solution contains 0.0877 moles of Cuco, what is the molarity?
Answer:
hope this helps
Explanation:
2. Well, we take the quotient...concentration=moles of solutevolume of solution
Explanation:
And thus concentration has the units of mol⋅L−1...
And so in this given scenario, the quotient gives....
concentration=[NaCl(aq)]=0.50⋅mol0.30⋅L=1.67⋅mol⋅L−1.
What are the concentrations with respect to [Na+], and [Cl−]?
3. molarity=2.41molL
Explanation:
Molarity=Moles of soluteLiters of solution
Moles=0.289
Solution=120mL=0.12L
Therefore,
Molarity=0.289mol0.12L≈2.41molL
4. 1.169 mol/L
Explanation:
From the question given, we obtained the following information:
Volume = 0.075 L
Mole of CuCo = 0.0877 moles
Molarity =..?
Molarity is simply defined as the mole of solute per unit litre of the solution. It is represented mathematically as:
Molarity = mole /Volume
With the above formula, we can obtain the molarity of the solution as follow:
Molarity = 0.0877 mol / 0.075 L
Molarity = 1.169 mol/L
Therefore, the molarity of the solution is 1.169 mol/L
Strontium has 3 stable isotopes with mass numbers 86, 87 and 88. Their relative abundances are 9.97%, 7.0% and 82.6% respectively. How do the number of electrons and the electron configurations compare for atoms of the three isotopes
Answer:
38 and [Kr] 5s2.
Explanation:
The number of electrons and the electronic configurations are the same for the three isotopes of Strontium because in isotopes number of neutron increases not number of proton or electron. Isotope of element having the same atomic number but with different atomic masses due to increase the number of neutrons in each isotope. So the number of electron in all isotopes are the same i.e. 38 and the electronic configuration is also the same i.e. [Kr] 5s2.
give an example of a primary income from the rest of the world
Answer:
(1) Income Associated with the Production Process
(a) Compensation of employees
(b) Taxes and subsidies on products and
production .
(2) Property Income
(a) Investment income:
• Dividends and withdrawals from income of
quasi-corporations
• Reinvested earnings
• Interest
(b) Rent .
I hope this is correct :-)
The exact mechanism of this reaction is a little complicated, as it involves the copper ions. However, the process involves the formation of small amounts of bromine in situ. Draw the mechanism of the bromination of 4-tert-butyl phenol with Br2. -g
Answer:
see picture below
Explanation:
The mechanism is in the following picture.
In the first step, the lone pair of oxygen (from the OH) as it's a strong activating group in the molecule, will go to the ring. This will cause that the double bond of the ring of the ortho position, attacks as nucleophyle to the Br2, causing the breaking of the bond.
In the second step, the bromine ion substract the hydrogen from the ortho position, and then, by resonance, the pair of electrons returns to the oxygen of the phenol.
Food Science is the study of the physical, biological, and chemical makeup of food; the
causes of food deterioration; and the concepts ulderlying food processing.
True
False
Mercury: Mineral or Not Mineral? Mineral Not Mineral
Answer:
not a mineral but is a “mineraloid
Explanation:
not mineral
Explanation: its an element but it is not a mineral
What is consciousness? ...
Why do we dream? ...
Why is there stuff? ...
Are there other universes?
A 1 liter solution contains 0.383 M hydrofluoric acid and 0.510 M potassium fluoride.
Addition of 0.096 moles of calcium hydroxide will:
(Assume that the volume does not change upon the addition of calcium hydroxide.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
Answer:
Lower the pH slightly
Explanation:
The mixture of HF, hydrofluoric acid and KF, potassium fluoride produce a buffer that is defined for the equilibrium:
HF(aq) → H⁺(aq) + F⁻(aq)
The buffer can maintain the pH of a solution despite the addition of strong bases or acids.
The reaction of HF with Ca(OH)2 is:
2HF + Ca(OH)2 → 2H2O + CaF2
That means the calcium hydroxide is decreasing the concentration of HF. Based on the equilibrium, the H+ and F- ions will decrease in order to produce more HF. As H+ is decreasing due the equilibrium and not for the addition of a strong base, the pH is decreasing slightly.
A student determines that the theoretical yield of CaCO3, from a precipitation reaction is 21.5 grams
However, this student only recovers 19.9 grams of precipitate through filtration of the solution.
What would be this student's percent yield?
A. 92.6%
B. 0.93%
C. 108%
D. 85.6%
Answer:
92.6
Explanation:
What do calories provude for the human body?
Answer:
energy for the body to work
Explanation:
What compound(s) does pure water contain?
Magnesium hydroxide and sodium hydroxide are both strong bases. The pH of a saturated solution of sodium hydroxide is greater than 14. The pH of a saturated
solution of magnesium hydroxide is about 10.2. Why do the solutions have different pH values?
Answer: Solubility of NaOH is greater and there are more OH- ions in solution.
Explanation: Reactions : NaOH (s) ⇒ Na+ (aq) + OH- (aq)
Mg(OH)2 (s) ⇒ Mg2+ (aq) + 2 OH-(aq)
Although in same amount of moles, Mg(OH)2 produces
two (OH-)-ions in water solution, solubility of Mq(OH)2 is smaller.
Concentration [OH-]ions is smaller in saturated water solution
of Mg(OH)2
Isoniazid is used in the treatment of tuberculosis and multiple sclerosis. Identify each lone pair as either localized or delocalized. Justify your answer in each case.
Answer:
Please find the complete question and its solution in the attached file:
Explanation: