A clear colorless aqueous solution marked “solution A” is mixed with a clear, light blue aqueous solution, labeled as “solution B”. An excerpt from a student’s laboratory manual reads “upon mixing the two solutions, the color of the solution turns a slightly lighter blue than the original solution B’s color.”
Which diagram above best represents the experiment described by the student’s laboratory manual? Note: For simplicity, water molecules are not shown.
Answers
The diagram that shows what has occurred is diagram D
How do you know a chemical reaction?If a substance changes color during the reaction, it can be a sign that a chemical change has occurred.
We can see from the image that we have been told that there is change in the color of the system and then when that happens, it would be clear that the molecules in the reactants must have stick together so that we can have the products of the reaction as shown.
Thus the image that shows a chemical reaction is image D
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Related Questions
Which substance has a standard enthalpy of formation of zero?.
Answers
Answer: In its natural condition, a pure element
the minister in change of religious and charititable patreonage was known as
Answers
Answer:
sadr
Explanation:
Pls give brainlist
Balance the following chemical equation by using System of equations Nag Pou + Ba(NO₂), ) Bag(Poes)₂ + NaNo₂
Answers
To balance the chemical equation: NaPO3 + Ba(NO2)2 → Ba(PO3)2 + NaNO2. substituting a = c into the third equation: a = c From the fourth equation, we have: 3a = 2c + 2a 3a = 2a + 2a a = 0.
We can set up a system of equations based on the number of atoms of each element on both sides of the equation. Let's denote the coefficients of the balanced equation as follows:
NaPO3: a
Ba(NO2)2: b
Ba(PO3)2: c
NaNO2: d
Now, we can write the system of equations:
Na: a = d
Ba: b = c
P: a = c
O: 3a = 2c + 2d
N: 2b = d
Solving this system of equations will give us the balanced coefficients. From the first equation, we can substitute d = a into the fifth equation:2b = a Substituting this back into the second equation: b = c Now, substituting a = c into the third equation: a = c From the fourth equation, we have: 3a = 2c + 2a 3a = 2a + 2a a = 0
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What element is represented in this model if the atomic number is 3?
This is science
Answers
Answer:
Lithium (Li)
Explanation:
Lithium has an atomic number of 3
Explain
solvay process
Answers
Answer: The Solvay process is an industrial process, also known as the ammonia-soda process
Explanation:
Imagine that Ana has a block made of pure gold. If she cuts this block into two equal pieces, pick the statement that best describes the resulting pieces.
Answers
Answer:
The density of each piece is the same as that of the original block.
Explanation:
Options
The mass of each piece is the same as that of the original block.
The weight of each piece is the same as that of the original block.
The density of each piece is the same as that of the original block.
The volume of each piece is the same as that of the original block.
The correct answer would be that the density of each piece is the same as that of the original block.
The density is the ratio of the mass of a substance to the volume of the substance. This ratio is constant for all substances because the mass of any object varies proportionally with the volume of the object. The more the mass increases, the more the volume also increases, and vice-versa.
Answer:
The answer is, C. funnel
Explanation:
The E∘ at 25∘C for the following reaction at the indicated concentration is 1.50 V. Calculate the ΔG in kJ at 25∘C : Cr(s)+3Ag + (aq,0.1M)→3Ag(s)+Cr3+ (aq,0.1M)
A. -140.94
B. -295
C. -212
D. -422.83 kJ
Answers
To calculate the ΔG in kJ at 25∘C for the given reaction, we can use the formula ΔG = -nFE∘, where n is the number of moles of electrons transferred in the reaction, F is the Faraday constant (96,485 C/mol), and E∘ is the standard cell potential at 25∘C. Therefore, the answer is D. -422.83 kJ.
From the balanced equation, we can see that 3 moles of electrons are transferred in the reaction. Therefore, n = 3.
Substituting the given values, we get ΔG = -3 * 96,485 * 1.50 = -435,682.5 J/mol. To convert this to kJ/mol, we divide by 1000, which gives us -435.68 kJ/mol.
However, the given concentrations are 0.1M, which means that the actual number of moles involved in the reaction is not 1 mol but 0.1 mol. Therefore, we need to multiply the above value by 0.1, which gives us -43.568 kJ.
Therefore, the answer is D. -422.83 kJ.
In summary, the given reaction has a standard cell potential of 1.50 V at 25∘C, and the ΔG for the reaction at the given concentrations is -422.83 kJ.
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What is the exponent when you convert 0.000978 into scientific notation
A. 4
b. -4
c. 3
d. -6
.. HELPPPPP
Answers
Answer:
B: -4
Explanation:
0.000978
0.00978(x10)
0.0978(x10x10)
0.978(x10x10x10)
9.78(x10x10x10x10)
9.78 X (10^4)
9.78X10^-4
because you move the decimal to the left it becomes negative 4
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10 If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.
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WILL GIVE A BRAINLIEST FOR THE ANSWER.
Pls open the picture for the question. I need the answer ASAP.
Answers
Answer:
(i) There is a very fast rate at t1, as its slope is the most significant, at t2 the rate is still positive, but it has decreased compared to t1, and at t3 the rate is almost constant, as seen by the nearly flat slope.
(ii) The trend in the reaction rate is logarithmic, with a very fast reaction rate at the beginning that slowly decreases.
Explanation:
WHAT IS OZONE POLLUTION
Answers
Answer: In the Earth's lower atmosphere, near ground level, ozone is formed when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources react chemically in the presence of sunlight. Ozone at ground level is a harmful air pollutant.
Explanation: In the Earth's lower atmosphere, near ground level, ozone is formed when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources react chemically in the presence of sunlight. Ozone at ground level is a harmful air pollutant.
Which climatic zone is very dry for nearly the entire year?
arid
temperate continental
tropical wet
Mediterranean
Answers
Answer:
Arid
Explanation:
pedro collected temperature data from the
Answers
The statement which have correct evidence supporting above is that electrical energy can be changed or converted into other form of energy.
Therefore, Option A is the correct option.
What is electrical energy?Electrical energy is defined as the energy which is derived from electric kinetic energy or potential energy of the charged particles.
In general, it is referred as the amount of energy which has been changed from electric potential energy. We can also define electrical energy as the energy which is generated by the movement of electrons from one position to another position. The movement of charged particles or electron through/along a medium which constitute current or electricity.
Unit of Electrical EnergyThe SI unit of Electrical Energy is watt-second.
The commercial unit of Electrical energy is kilowatt-hour.
1Kwh = 3.6 × 10^6 J.
Some example of Conversion of Electrical energy are as follow:
Fan - The electrical energy is converted into mechanical energy and heat energy.
Therefore, the electrical energy in light bulb is converted into light energy and heat energy.
Thus, we concluded that the electrical energy can be changed or converted into other form of energy.
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At which location are metamorphic rocks most likely to
form?
ОА
ов
с C
OD
the answer is B
Answers
Answer:
Yup B
Explanation:
If an object's mass is 70 g, and its volume is 10cm cubed, what is its density?
Answers
If an object's mass is 70 g, and its volume is 10cm cubed, its density is 7 centimeter cube.
What is density?The density of any solid substance is the unit of the area occupied by it in per centimeter of the cube of the volume in the given sample and calculated by dividing the mass and the volume of the compound unit will be centimeter cube.
The mass of the given object is 70 gram and the volume is given is 10 cm to find the density,
Density = mass of object / volume of object
substituting the value in the formula,
Density = 70 / 10
Density = 7 centimeter cube.
Therefore, the density of the given object will be 7 centimeter cube if an object's mass is 70 g, and its volume is 10cm cubed.
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What would this frequency become if the person's breathing passage were filled with helium instead of air? assume the same temperature dependence for helium as for air.
Answers
1.07×10³Hz frequency become if the person's breathing passage were filled with helium instead of air
Here, air temp is taken as 37.0°C if the person's breathing passage were filled with helium instead of air then we find out velocity of sound in the helium. here velocity of sound in the helium for 0°C is 965m/s
formula for velocity of sound in the helium :
Vw he=Vw at 0°C×√T/273
Whereas Vw he=965×√273+37/273
Vw he=1028m/s
Here we find frequency so fundamental freq=fundamental harmonic no 1(velocity/4(length of tube)
=1(1028/4×0.24)
f=1.07×10³Hz
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he average tire pressure for an automobile is 38.5 psi which is how many atmospheres of pressure? 1.77 x 10-3 atm 566 atm 2.62 atm o co do What is the volume for 1.00 mole of gas at Standard Temperature and Pressure (STP)? 24.5 L 22.4 L 2.05 L What is the standard pressure for 1.00 mole of gas at STP? 760 mm Hg 1.03 atm 103 kPa
Answers
The average tire pressure for an automobile is 38.5 psi, which is approximately 2.62 atom of pressure. Therefore, 38.5 psi divided by 14.7 psi/atm is approximately 2.62 atm.
STP is defined as 0 degrees Celsius (273 K) and 1 atmosphere of pressure. The volume of 1 mole of gas at STP is known as the molar volume and is equal to 22.4 L. This value is obtained from the Ideal Gas Law, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. At STP, the pressure is 1 atm and the temperature is 273 K, so substituting these values into the equation, we get V = nRT/P = (1 mol)(0.08206 L atm/mol K)(273 K)/(1 atm) = 22.4 L.
As mentioned earlier, STP is defined as 0 degrees Celsius (273 K) and 1 atmosphere of pressure. Therefore, the standard pressure for 1.00 mole of gas at STP is 1.00 atm. Alternatively, it can also be expressed in units of mm Hg, which is another common unit of pressure. 1.00 atm is equivalent to 760 mm Hg, so either value can be used to represent the standard pressure at STP.
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What phrase Best defines energy 
Answers
Answer:
the ability to do work.
Explanation:
Calculate the equilibrium concentration of ph3 if a solid sample of ph3bcl3 is placed in a closed vessel at 80 ∘c and decomposes until equilibrium is reached.
Answers
The equilibrium expression for BCl3 would be:
Kc = ([PH3]^x * [BCl3]^y) / [PH3BCl3]
To calculate the equilibrium concentrations and the minimum mass of PH3BCl3 required to achieve equilibrium, we need the balanced chemical equation for the decomposition reaction and its corresponding equilibrium constant at 80 °C. Unfortunately, I don't have access to that specific information as it is beyond my knowledge cutoff in September 2021. However, I can provide you with a general approach to solving these types of equilibrium problems.
Equilibrium concentration of PH3:
Let's assume the balanced chemical equation for the decomposition of PH3BCl3 is:
PH3BCl3(g) ⇌ xPH3(g) + yBCl3(g)
The equilibrium expression using concentrations would be:
Kc = ([PH3]^x * [BCl3]^y) / [PH3BCl3]
To solve for the equilibrium concentration of PH3, you would need the values of x and y from the balanced equation and the equilibrium constant value (Kc) specific to the reaction at 80 °C.
Equilibrium concentration of BCl3:
Using the same balanced equation:
PH3BCl3(g) ⇌ xPH3(g) + yBCl3(g)
The equilibrium expression for BCl3 would be:
Kc = ([PH3]^x * [BCl3]^y) / [PH3BCl3]
Similar to the previous step, you would need the values of x and y from the balanced equation and the equilibrium constant value (Kc) specific to the reaction at 80 °C.
Minimum mass of PH3BCl3:
To determine the minimum mass of PH3BCl3 required to achieve equilibrium, you would need additional information such as the initial and equilibrium concentrations or the number of moles involved. With this information, you can calculate the moles of PH3BCl3 involved and then convert it to the minimum mass using the molar mass of PH3BCl3.
Please note that the specific values needed for the calculations depend on the actual reaction and its equilibrium constant at 80 °C, which I don't have access to. Therefore, I can't provide numerical calculations or units at this time.
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b) Explain if the fossil evidence supports the idea that each cycle takes a long period of time.
Answers
Fossils are great for providing evidence for an evolutionary change! Scientists can see how long life has existed on Earth by studying fossil records. Any living organism that is preserved, is considered a fossil, including plants! Fossils take 10,000 years to be formed, showing that, yes, fossil evidence supports that these cycles of evolution take quite a long time.
Hope this helps!
-Moiselle
Neutral atoms & charged atoms has
equal number of electrons
Answers
Answer:
wrong.
Explanation: charged atoms have have more electrons than neural because they charge it . a neural atom has eaqual number of electrons and neutrons.
hope this helps(^人^)
Americium–241 decays into neptunium–237. which correctly describes this process of radioactive decay? an unstable nucleus decays into a more stable nucleus. energy in the nucleus is converted into mass. the strong nuclear force splits the nucleus apart. the atom loses four protons.
Answers
When Americium–241 decays into neptunium–237, an unstable nucleus decays into a more stable nucleus.
What is Radioactive decay?
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all of which involve emitting one or more particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force. A fourth type of common decay is Electron Capture, in which an unstable nucleus captures an inner electron from one of the electron shells. The loss of that electron from the shell results in a cascade of electrons dropping down to that lower shell, resulting in emission of discrete X-rays from the transitions. A common example is Iodine-125 commonly used in medical settings.Radioactive decay is a stochastic (i.e. random) process at the level of single atoms. According to quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed. However, for a significant number of identical atoms, the overall decay rate can be expressed as a decay constant or as half-life. The half-lives of radioactive atoms have a huge range; from nearly instantaneous to far longer than the age of the universe.The decaying nucleus is called the parent radionuclide (or parent radioisotope), and the process produces at least one daughter nuclide.Except for gamma decay or internal conversion from a nuclear excited state, the decay is a nuclear transmutation resulting in a daughter containing a different number of protons or neutrons (or both). When the number of protons changes, an atom of a different chemical element is created.To learn more about Radioactive decay: https://brainly.com/question/1770619
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Positive ∆H means that the reaction tends to go forwards.
Negative ∆H means that the reaction tends to go in reverse.
Group of answer choices
True. Positive means forwards and negative means reverse.
False. Atoms want to be in the lowest energy state.
Answers
The statement "Positive ∆H means that the reaction tends to go forwards. Negative ∆H means that the reaction tends to go in reverse" is generally true.
What are the types of reactions?When the enthalpy change is positive, the reaction is endothermic, which means that heat is taken in by the system from the environment. When the reaction progresses towards a more stable state with lower energy, this often leads to a rise in the energy of the reactants and an increase in the possibility that the reaction will proceed further.A negative H, on the other hand, denotes an exothermic process, in which the system releases heat into the environment. The energy of the reactants normally decreases as a result and the possibility that the reaction will proceed in the other direction as it progresses towards a more stable state with lower energy increases.learn more about ∆H here
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The health care provider orders KCL 30 mEq. The medication is available in a unit dose package labeled: KCL 60 mEq/10 mL. The medicine cup is marked teaspoons. How many teaspoons will the nurse administer? tsp
Answers
the nurse will administer approximately 1 teaspoon (tsp) of the medication.1 teaspoon (tsp) is approximately equal to 5 mL.
How many teaspoons will the nurse administer?To determine the number of teaspoons the nurse should administer, we need to calculate the equivalent volume of 30 mEq of KCL using the provided concentration of 60 mEq/10 mL.
First, we'll find the ratio of milliequivalents (mEq) to milliliters (mL) in the given concentration:
60 mEq / 10 mL = 6 mEq/mL
Next, we can set up a proportion to find the volume (in mL) that corresponds to 30 mEq:
6 mEq/mL = 30 mEq / X mL
To solve for X, we can cross-multiply:
6X = 30 * 1
6X = 30
X = 30 / 6
X = 5 mL
Since the medication cup is marked in teaspoons, we need to convert 5 mL to teaspoons.
1 teaspoon (tsp) is approximately equal to 5 mL.
Therefore, the nurse will administer approximately 1 teaspoon (tsp) of the medication.
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Who is credited with arranging the periodic table?.
Answers
Answer
Dmitri Mendeleev Explanation:The modern periodic tables is credited primarily to the russian chemist Dmitri Mendeleev. Mendeleev's table is based on the periodic law, which states that when elements are arranged in order of increasing mass, their properties recur periodically.
How do you identify conduction?
Answers
Direct contact between objects causes conduction or heat transfer. The heat is transferred inside the fluid during convection. Heat transfer in radiation happens by electromagnetic waves without the use of particles.
How can conduction be distinguished?First, ascertain whether the two things are in contact. If they are, conduction is how heat is transferred between them. Determine whether there is a fluid medium, such as a liquid or gas, connecting the items if they are not in contact.
How do you recognize conduction, a type of heat transfer?Evidence of heat transport is apparent. Convection is the phenomenon that causes the air to shimmer over radiators. Conduction is the phenomenon that causes you to feel warm when you place your hand on a spoon that has been sitting in a hot bowl of soup (radiation).
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Pls help I’m stuck on this part
Answers
Answer:
As you begin your trip down the hill you increase your speed resulting in a transformation from potential energy to kinetic energy.
Explanation:
At the top of the mountain, you have potential energy. But as you start moving down the mountain, your speed increases and have a lot of kinetic energy.
50.0 ml of 2.60 M HBr(aq) was exactly neutralized (final pH=7) by a 1.80 M solution of NaOH(aq). How much volume of of the NaOH solution was added ?
Answers
Answer:
72.2 ml
Explanation:
The neutralization equation between HBr (acid) and NaOH (base) is the following:
HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)
We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:
moles HBr = moles NaOH
M(HBr) x V(HBr) = M(NaOH) x V(NaOH)
Now, we calculate the volume of NaOH with the data:
V(NaOH)= M(HBr) x V(HBr)/M(NaOH)
= (2.60 mol/L x 50.0 ml)/(1.80 mol/L)
=72.2 ml
Part D
Calculate the following for test tube 1 and for test tube 2, and record the results in the table:
the number of moles of copper(II) sulfate used (Use 159.60 grams/mole as the molar mass of copper(II) sulfate.)
the heat absorbed by the water, in joules (Use Q = mCΔT, where 10.0 milliliters of water has a mass of 10.0 grams. Use 4.186 joules/gram degree Celsius as water’s specific heat capacity.)
the change in internal energy of the copper(II) sulfate (Assume that the energy released by the copper(II) sulfate is absorbed by the water.)
the reaction enthalpy, in joules/mole
Answers
The heat lost by copper(ii) sulfate is equal to heat absorbed by water since the total energy in the system remains constant according to the law of conservation of energy.
How can the number of moles be determined?The number of moles of a substance is determined using the formula below:
Number of moles = mass/molar massAssuming the mass of copper(ii) sulfate used is Mc, number of moles of copper(ii) sulfate used is:
Moles of copper(ii) sulfate = Mc/159.60 molesThe heat absorbed by water is calculated using the formula below:
Quantity of Heat, H = mass × specific heat capacity × temperature changemass of water = 10 g
Let temperature change be Tc
Heat absorbed by water = 10 × 4.186 × Tc = 41
86Tc
The change in internal energy, ΔU of copper(ii) sulfate, is given as:
ΔU = Q − Wwhere:
Q = heat absorbed by water
W = work done by or on the system
The enthalpy of the reaction is given as:
ΔH= energy released or absorbed/moles of copper (ii) sulfateTherefore, according to the law of conservation of energy, the total energy in the system remains constant.
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Use the equation to answer the question.
H2O(l) + heat = H2O(g)
A sample of water is at equilibrium at 100°C. Which statement best describes what will happen if liquid water is added to the system?
A) All of the liquid water molecules that are added will remain
liquid water.
B) More water vapor molecules will change to liquid water until a
new equilibrium is reached.
C) All of the liquid water molecules that are added will become
water vapor.
D) More liquid water molecules will change to water vapor until a
new equilibrium is reached.
Answers
Answer:
D
Explanation:
More liquid water molecules will change to water vapor until a
new equilibrium is reached.
Answer:
Equilibrium and Stability Quick Check
1. The rate of the forward reaction equals the rate of the reverse reaction.
2. More LIQUID WATER molecules will change to WATER VAPOR until a new equilibrium is reached.
3. By adding WATER (H2O).
4. The additional BROMINE IONS cause the equilibrium to shift to the REACTANTS.
5. Removing WATER (H2O).
Explanation:
100% if you put these answers.
Why do hospitals use saline instead of distilled water?.
Answers
Explanation:
Normal saline contains Na+ and Cl-. Extracellularly,there is more Na+ and Cl- than intracellularly and most often during loss of bodily fluid,it is extracellular fluid that is lost and so the Na+ and Cl- ions in saline replenish these. Even if the loss of fluid is intracellular,it can still be replenished (passively )from the extracellular fluid into the intracellular fluid. Conversely, distilled water is just water which lacks any special electrolytes to carry out these functions as the normal saline