Can someone please help me? :(
Answer:
b
Explanation:
Answer:
The answer is B
Explanation:
I hope this helps very much
if you prepare 25mL of 0.010M NaCl starting with a 0.500 M NaCl solution, how much of the initial solution do you need?
Answer:
The answer is given in the picture
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASEIn which reaction at equilibrium will the point of equilibrium shift to the right when the pressure decreases at constant temperature
1. N2(g) + 3H2(g) - 2NH3(g)
2. H2(g) + Bra(o) - 2HBr()
3. CaCO3(s) - Cao(s) + CO2(g)
3. N2(g) + O2(g) - 2NO(9)
Answer:3
Explanation: an increase in pressure will just place the point of equilibrium in the direction that fevers the formation of the fewer number of moles. A decrease in pressure will displace the point of equilibrium in the direction that favors the formation of a greater number of moles as a system attempts to return to equilibrium
The reaction CaCO3(s) →Cao(s) + CO2(g) at equilibrium will be shifted to the right when the pressure decreases at constant temperature.
What is equilibrium?Chemical equilibrium can be defined as the state of a system where the concentration of the reactant, as well as the concentration of the products, as well as the concentration of the products, will not change over time and the system's characteristics also will not change.
It is well known that when the number of moles grows, equilibrium shifts to the side where the number of moles grows when pressure is reduced.
In this equation, CaCO3(s) →Cao(s) + CO2(g)
Number of moles in reactant side= 1
Number of moles in product side = 2
Hence, for this reaction equilibrium will be shifted in right side.
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Help asap and correct answer
The diagram below shows the branching tree diagram for cats. (5 points)
A slanting, horizontal line is shown. On the extreme left, there is a label that says Common Ancestor. Along the slanting, horizontal line there are five dots labeled from left to right with the following traits Four limbs, Amniotic egg, Fur, Shearing teeth, and Retractable claws. There is one vertical line between each of the consecutive five dots. The lines are labeled from the from left to right as Amphibians, Reptiles, Marsupials, Dogs, Cats.
Which characteristic is shared by the greatest number of organisms?
Amniotic egg
Four limbs
Fur
Retractable claws
What is the molarity of a salt solution made by dissolving 280.Omg of NaCl in 2.00mL of water. Assume the final volume is the same as the volume of the water.
Answer:
The molarity of a solution tells you how many moles of solute you get per liter of solution.Notice that the problem provides you with the volume of the solution expressed in milliliters mL.Right from the start you should remember that you must convert this volume to liters by using the conversion factor1 L=10+3mL
Explanation:
hope this helps if not please let me now
ii. FILL IN THE BLANK
FILL IN THE BLANK BY USING SUITABLE WORDS:
1. In electron dot structure, the dot represent ................. electrons.
2. Ionic compounds are highly soluble in ...........
3. The bond formed by the mutual sharing of two electrons is called .................. bond.
4. there are ................ bonds in nitrogen molecule.
5. the .......... bonds are non-directional.
6. NaCl is ......... in molten state
7. formula of common salt is ............
8. Oxygen gas is a ..........m molecule.
Answer:
1. In electron dot structure, the dot represent one electrons.
2. Ionic compounds are highly soluble in water.
3. The bond formed by the mutual sharing of two electrons is called covalent bond.
4. there are 3 bonds in nitrogen molecule.
5. the ionic bonds are non-directional.
6. NaCl is taken in molten state
7. formula of common salt is NaCl.
8. Oxygen gas is a diamotic molecule.
hope it helps :)
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What is the molarity of the solution with a volume of 8.26 Liters and 9.870 moles?
Answer: 1.19 M
Explanation:
molarity = (moles of solute)/(liters of solution) = 9.870 / 8.26 = 1.19 M
Water vapor enters a compressor at 35 kpa and 160°c and leaves at 300 kpa with the same specific entropy as at the inlet. What are the temperature and the specific enthalpy of water at the compressor exit? use steam tables.
The initial entropy is obtained from the initial pressure and temperature with data from A-6 using interpolation:
s= 8.2652 kJ/kgK
The final temperature is determined from the entropy and the final pressure with data from A-6 using interpolation:
T₂ = T₁+ T₂ - T₁/ 8₂ - 8₁ ( s - s₁)
= (400 + 500 - 400/8.3271 - 8.0347 (8.2652 - 8))
= 478.83°C
The final enthalpy is determined in the same way:
h₂= h₁ + h₂ - h₁/s₂ - s₁ ( s - s₁)
= ( 3275.5+ 3486.6 - 3275.5/ 8.3271 - 8.0347) (8.265)
= 3441.91 kJ/kg
Animals that eat only other animals are called ________. (2 points) a carnivores b decomposers c herbivores d omnivores. Giving 27 points
Answer:
The answer is Carnivore
Explanation:
A carnivore eat meat which is other animals.
The purpose of the light dependent reaction is to convert ____ to _____.
What is the molarity of 2.5 liters of solution containing 5 moles of NaCl?
Answer:
2 mol/L
Explanation:
Molarity is Moles/Liters, you just simple divide 5 moles ÷ 2.5 L =2 mol/L
4. How can you calculate the solubility of a gas in a liquid under different
pressures
The solubility of a gas in a liquid under different pressures can be calculated using Henry's Law.
The solubility of a gas in a liquid under different pressures can be calculated using Henry's Law, which describes the relationship between the pressure of a gas and its solubility in a liquid. According to Henry's Law, at a constant temperature, the solubility (S) of a gas in a liquid is directly proportional to the partial pressure (P) of the gas above the liquid.
Mathematically, Henry's Law is expressed as:
S = k * P
Where:
S = Solubility of the gas in the liquid (usually in mol/L or g/L)
k = Henry's Law constant, which is specific to the gas and the solvent at a given temperature (units depend on the units of pressure and solubility chosen)
P = Partial pressure of the gas above the liquid (usually in atm or kPa)
To calculate the solubility of a gas in a liquid under different pressures, you would typically perform the following steps:
Determine the Henry's Law constant (k) for the specific gas and solvent at the given temperature.
Measure or obtain the partial pressure (P) of the gas above the liquid at the desired pressure conditions.
Use the Henry's Law equation to calculate the solubility (S) of the gas in the liquid:
S = k * P
The solubility will be in units of mol/L (molarity) or g/L, depending on the units used for the Henry's Law constant and partial pressure.
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The difference in temperature of the two glasses of water is 30°C. What is their difference in temperature on the Kelvin scale?
A. 30 K C. 243 K
B. 86 K D. 303 K
Answer:
D
Explanation:
Because 30c is kevin and add 303+30=333-30=303
The difference in temperature of the two glasses of water is 30°C. The difference in temperature on the Kelvin scale is 86 K D. 303 K. Therefore, option B is correct.
What is temperature ?The term temperature is refer to the degree of hotness or coldness of an object.Temperature is measured with a thermometer. Temperature is the measure of average kinetic energy of a system.
There are main three different scales are commonly used to measure temperature that are Fahrenheit (expressed as °F), Celsius (°C), and Kelvin (K).
The difference in temperature of the two glasses of water is 30°C. The difference in temperature on the Kelvin scale is 86 K D. 303 K. Because at 30°c in Kelvin = 273 + 30
= 303 kelvin
Thus, option B is correct.
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What is the temperature of 0. 750 mol of a gas stored in a 6,850 ml cylinder at 2. 21 atm?.
-246 K-
________________
What is science? Write a definition for the word
Answer:
make me brainliest pls :)
Explanation:
Science is both a body of knowledge and a process. In school, science may sometimes seem like a collection of isolated and static facts listed in a textbook, but that's only a small part of the story. Just as importantly, science is also a process of discovery that allows us to link isolated facts into coherent and comprehensive understandings of the natural world.
Science is exciting. Science is a way of discovering what's in the universe and how those things work today, how they worked in the past, and how they are likely to work in the future. Scientists are motivated by the thrill of seeing or figuring out something that no one has before.
Science is useful. The knowledge generated by science is powerful and reliable. It can be used to develop new technologies, treat diseases, and deal with many other sorts of problems.
Science is ongoing. Science is continually refining and expanding our knowledge of the universe, and as it does, it leads to new questions for future investigation. Science will never be "finished."
Science is a global human endeavor. People all over the world participate in the process of science. And you can too!
A sample of iron (fe) with a mass of 200.0 g releases 9,840 cal when it freezes at its freezing point. what is the molar heat of fusion for iron? use q equals n delta h.. 2,747.7 cal/mol 2,771.8 cal/mol 2,811.7 cal/mol 3,280.0 cal/mol
The molar heat of fusion for iron with a mass of 200.0g releases 9,840 cal when it freezes at its freezing point is 2,747.7 cal/mol.
How to calculate molar heat of fusion?The heat of fusion of a substance can be calculated by using the following formula:
Q = m∆H
Where:
Q = quantity of heatm = mass∆H = change in temperature of fusionHowever, the quantity of heat has been given as 9840calories. The molar heat of fusion of iron can be calculated by dividing the heat of fusion by the number of moles of iron.
Moles of iron = mass ÷ molar mass
moles = 200g ÷ 55.8g/mol
moles = 3.58moles
molar heat of fusion = 9840 cal ÷ 3.58mol
molar heat of fusion = 2748.6 cal/mol
Therefore, the molar heat of fusion for iron with a mass of 200.0g releases 9,840 cal when it freezes at its freezing point is 2,747.7 cal/mol.
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Answer:
A) 2,747.7 cal/mol
Explanation:
EDGE 2022
Explain how the law of conservation of mass allows you to interpret a balanced chemical equation in terms of mass.
Balancing the coefficients means that the number of atoms are the same on each side which means that the masses of reactants and products are equal.
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When the season changes and a bird migrates, the bird is responding to which of these?
an internal cue
an external cue please help
Answer:
Internal Cue
Explanation:
Answer:
an internal cue
Explanation:
just think
I
A chemical blank
occurs when some substances
change chemically to other substances
Answer:
its a chemical Reaction
Explanation:
Item 16 A sample of gas has a temperature of 200 K. If the speed of every gas molecule in the sample is doubled, what is the new temperature of the gas
If the speed of every gas molecule in the sample is doubled, then the new temperature of the gas is 80K.
What is relation between the speed and temperature?Speed of any molecule of gas is measured in terms of velocity and relation between root mean square velocity and temperature will be calculated as:
V = √3RT/M
Means velocity is directly proportional to the square root of the temperature, and for this question required equation is:
V₁/V₂ = √T₁/T₂
If velocity of the molecule is gets double then equation becomes,
V₁/2V₁ = √200/T₂
T₂ = 800K
Hence resultant temperature of gas is 800K.
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Why is only increasing the ph of the ocean not enough to restore the ocean’s equilibrium?.
The increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.
What is the ocean's equilibrium?Equilibrium is a state where the presence of base and acid is in equal quantity.
Increased pH, leads to more acidity and reduces the number of ions.
Ions are necessary for corals, oysters, mussels, and many other shelled organisms that require building their shells and skeletons.
Thus, increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.
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In a titration of sulfuric acid against sodium hydroxide, 32.20 mL of 0.250 M NaOH is required to neutralize 26.60 mL of H2so
Answer:
About 0.151 M.
Explanation:
Because 32.20 mL of 0.250 M NaOH was used, determine the number of moles of NaOH consumed:
[tex]\displaystyle 32.20\text{ mL} \cdot \frac{0.250\text{ mol NaOH}}{1\text{L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.00805\text{ mol NaOH}[/tex]
Find the number of moles of sulfuric acid reacted with using reaction stoichiometry:
[tex]\displaystyle 0.00805\text{ mol NaOH} \cdot \frac{1\text{ mol H$_2$SO$_4$}}{2\text{ mol NaOH}} = 0.00402\text{ mol H$_2$SO$_4$}[/tex]
Therefore, the molarity of the original sulfuric acid solution is:
[tex]\displaystyle \ [\text{H$_2$SO$_4$}] = \frac{0.00402\text{ mol}}{26.60\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.151\text{ M}[/tex]
In conclusion, the molarity of the original sulfuric acid solution was about 0.151 M.
The reaction below is at equilibrium. What would happen if more Na2O2 were
added?
2Na(s) +0,02Nao,(s)
A. The equilibrium position would stay the same.
O B. The equilibrium position would shift to produce more Na202.
C. The equilibrium position would shift to produce more Na2 and 02.
D. The equilibrium position would shift to produce more 02.
If more Na[tex]_2[/tex]O[tex]_2[/tex] were added in 2Na(s) +0,02Nao,(s)→ Na[tex]_2[/tex]O[tex]_2[/tex]. The equilibrium position would shift to produce more Na and O[tex]_2[/tex]. Therefore, the correct option is option C.
What is equilibrium?During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. When a chemical reaction is reversible, the products react with the original reactants as soon as they are created.
There's no net change in the quantity of the chemicals involved when the two opposed reactions are in equilibrium because they are occurring at identical rates, or velocities. At this point, the reaction can be deemed to be finished, meaning that the maximum amount of reactants into products has been converted under the given reaction conditions. If more Na[tex]_2[/tex]O[tex]_2[/tex] were added in 2Na(s) +0,02Nao,(s)→ Na[tex]_2[/tex]O[tex]_2[/tex]. The equilibrium position would shift to produce more Na and O[tex]_2[/tex].
Therefore, the correct option is option C.
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Explain how we know that charge is conserved in this
reaction: Li+ CI → Lici
Answer:
Charge is conserved due to the groups in which Lithium and Chlorine are located in the periodic table of the elements.
Explanation:
In the reaction [tex]Li + Cl - > LiCl[/tex], we can examine the groups in which Li and Cl are found in the periodic table of the elements. Lithium appears in Group 1A, or the alkali metals group, indicating that it carries a charge of +1. Chlorine appears in Group 7A, or the halogen group, indicating that it carries a charge of -1. Because LiCl's constituent elements carry the same charges as previously mentioned, LiCl will have an overall charge of 0.
The chemical equation can then be rewritten as [tex]Li^{+} + Cl^{-} - > LiCl[/tex], which, if looking at the individual charges of Li and Cl in lithium chloride, becomes [tex]Li^{+} + Cl^{-} - > Li^{+}Cl^{-}[/tex]. Adding the charges on the reactant and product sides of this chemical equation gives us zero in both locations, meaning that we have a charge of 0 on the reactant side and a charge of 0 on the product side. This indicates that charge is conserved in this reaction.
Another way to look at this is expressed in the valence electrons of Li and Cl. Li has an electron configuration of [tex]1s^{2}2s^{1}[/tex], where the n = 2 electron shell has one of eight total electrons needed to fill the valence shell. This means that Li will easily lose one electron in order to have an electron configuration where the n = 1 electron shell is full, [tex]1s^{2}[/tex], and become the [tex]Li^{+}[/tex] ion. Similarly, Cl has an electron configuration of [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}[/tex] (or [tex][Ne]3s^{2}3p^{5}[/tex]), meaning that the n = 3 electron shell is one electron away from becoming complete. Cl will easily gain one electron to have the electron configuration [tex][Ne]3s^{2}3p^{6}[/tex] (or [tex][Ar][/tex]) in order to have an electron configuration where the n = 3 electron shell is full, [tex]3s^{2}3p^{6}[/tex], and become the [tex]Cl^{-}[/tex] ion. Thus, when Li and Cl bond, Li will lose the electron [tex][1, 0, 0, +\frac{1}{2}][/tex] and transfer it to Cl, where it will become the electron [tex][3, 1, 1, -\frac{1}{2}][/tex], thus conserving charge, as there is an equal total number of electrons before and after the reaction.
When considering metal complexation with EDTA, if you are comparing 2 metals, the metal with a higher ____________ will react with EDTA first.
If you are comparing 2 metals, the metal with a higher Number of free ions will react with EDTA first
What is EDTA ?EDTA is a type of chemical which binds certain metal ions such as calcium and magnesium. some of the functions of EDTA includes:
Preventing blood clotting of blood samplesprevention of the formation of Biofilm by bacteriasThe EDTA will readily react with metals which have a hiogher number of free ions that it can bind with.
Hence we can conclude that If you are comparing 2 metals, the metal with a higher Number of free ions will react with EDTA first.
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Energy Transformation: A home is heated with geothermal energy
(What energy forms are used and how do they go from each form to get to the final form)
Answer: they convert heat to electricity.
Explanation:
what volume of water in ml initially at 85.4 C needs to be mixed with 200 ml of water initally at 29.5 C so that the final temperature of the water is 36.2 C
Answer:
About 27 mL of water.
Explanation:
We can use the heat transfer equation. Recall that:
[tex]\displaystyle q = mC\Delta T[/tex]
Heat is transferred from the water with higher temperature to the water with lower temperature. Hence:
[tex]\displaystyle -q_1 = q_2[/tex]
Substituting yields:
[tex]-m_1C \Delta T_1 = m_2C\Delta T _2[/tex]
We can solve for m₁:
[tex]\displaystyle \begin{aligned} m_1 &= -\frac{m_2 C\Delta T_2}{ C \Delta T_1} \\ \\ & = -\frac{m_2\Delta T_2}{\Delta T _1}\end{aligned}[/tex]
The desired final temperature of water is 36.2 °C. Substitute and evaluate:
[tex]\displaystyle \begin{aligned} m_1 & = -\frac{(200\text{ mL})(36.2\text{ $^\circ$C}-29.5\text{ $^\circ$C})}{(36.2\text{ $^\circ$C}-84.5\text{ $^\circ$C})} \\ \\ & = -\frac{(200\text{ mL})(6.7\text{ $^\circ$C})}{-49.2\text{ $^\circ$C}}\\ \\ & =27\text{ mL}\end{aligned}[/tex]
In conclusion, about 27 mL of water should be added.
What is the volume of 1.60 grams of O2 gas at STP? (5 points)
1.72 liters
1.45 liters
1.32 liters
1.12 liters
Answer:
1.12 litersExplanation:
Calculating number of moles
Molar mass of O₂ = 32 gn = Given weight / Molar massn = 1.6/32n = 0.05 molesAt STP
One mole of O₂ occupies 22.4 LTherefore, 0.05 moles will occupy :22.4 L x 0.05 = 1.12 L1mol of any gas at STP contains 22.4L
moles of O_2
Given mass/molar mass1.6/320.05molNow
Volume of O_2:-
0.05(22.4)1.120LOption D
Can there be pH measurements greater than 14 or less than zero? Explain.
Answer:
scale does not have fixed limits, so it is indeed possible to have a pH above 14 or below zero.
Support gases system are subject to the same hazards as, present in any piped medical gas system with the additional hazard of_________________.
The complete statement will be "Support gases system are subject to the same hazards as, present in any piped medical gas system with the additional hazard of higher pressure"
What are gas systems?Generally, A gas system is simply defined as an assemblage of tubes, used for gas reticulation and circulation.
In conclusion, a higher pressure will be experienced as an additional hazard to the medical gas system.
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